3 struct PrintOnPanic<F: Fn() -> String>(F);
4 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
6 if ::std::thread::panicking() {
7 println!("{}", (self.0)());
12 pub fn trans_mono_item<'a, 'clif, 'tcx: 'a, B: Backend + 'static>(
13 cx: &mut crate::CodegenCx<'a, 'clif, 'tcx, B>,
14 mono_item: MonoItem<'tcx>,
19 MonoItem::Fn(inst) => {
21 PrintOnPanic(|| format!("{:?} {}", inst, tcx.symbol_name(inst).as_str()));
22 debug_assert!(!inst.substs.needs_infer());
23 let _mir_guard = PrintOnPanic(|| {
26 | InstanceDef::DropGlue(_, _)
27 | InstanceDef::Virtual(_, _)
28 if inst.def_id().krate == LOCAL_CRATE =>
30 let mut mir = ::std::io::Cursor::new(Vec::new());
31 crate::rustc_mir::util::write_mir_pretty(
37 String::from_utf8(mir.into_inner()).unwrap()
40 // FIXME fix write_mir_pretty for these instances
41 format!("{:#?}", tcx.instance_mir(inst.def))
46 trans_fn(cx, inst, linkage);
48 MonoItem::Static(def_id) => {
49 crate::constant::codegen_static(&mut cx.ccx, def_id);
51 MonoItem::GlobalAsm(node_id) => tcx
53 .fatal(&format!("Unimplemented global asm mono item {:?}", node_id)),
57 fn trans_fn<'a, 'clif, 'tcx: 'a, B: Backend + 'static>(
58 cx: &mut crate::CodegenCx<'a, 'clif, 'tcx, B>,
59 instance: Instance<'tcx>,
65 let mir = tcx.instance_mir(instance.def);
67 // Step 2. Declare function
68 let (name, sig) = get_function_name_and_sig(tcx, instance, false);
69 let func_id = cx.module.declare_function(&name, linkage, &sig).unwrap();
70 let mut debug_context = cx
73 .map(|debug_context| FunctionDebugContext::new(tcx, debug_context, mir, &name, &sig));
75 // Step 3. Make FunctionBuilder
76 let mut func = Function::with_name_signature(ExternalName::user(0, 0), sig);
77 let mut func_ctx = FunctionBuilderContext::new();
78 let mut bcx = FunctionBuilder::new(&mut func, &mut func_ctx);
80 // Step 4. Predefine ebb's
81 let start_ebb = bcx.create_ebb();
82 let mut ebb_map: HashMap<BasicBlock, Ebb> = HashMap::new();
83 for (bb, _bb_data) in mir.basic_blocks().iter_enumerated() {
84 ebb_map.insert(bb, bcx.create_ebb());
87 // Step 5. Make FunctionCx
88 let pointer_type = cx.module.target_config().pointer_type();
89 let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance);
91 let mut fx = FunctionCx {
101 local_map: HashMap::new(),
104 constants: &mut cx.ccx,
105 caches: &mut cx.caches,
106 source_info_set: indexmap::IndexSet::new(),
109 // Step 6. Codegen function
110 with_unimpl_span(fx.mir.span, || {
111 crate::abi::codegen_fn_prelude(&mut fx, start_ebb);
112 codegen_fn_content(&mut fx);
114 let source_info_set = fx.source_info_set.clone();
116 // Step 7. Write function to file for debugging
117 #[cfg(debug_assertions)]
118 fx.write_clif_file();
120 // Step 8. Verify function
121 verify_func(tcx, fx.clif_comments, &func);
123 // Step 9. Define function
124 cx.caches.context.func = func;
126 .define_function(func_id, &mut cx.caches.context)
129 // Step 10. Define debuginfo for function
130 let context = &cx.caches.context;
131 let isa = cx.module.isa();
134 .map(|x| x.define(tcx, context, isa, &source_info_set));
136 // Step 11. Clear context to make it usable for the next function
137 cx.caches.context.clear();
140 fn verify_func(tcx: TyCtxt, writer: crate::pretty_clif::CommentWriter, func: &Function) {
141 let flags = settings::Flags::new(settings::builder());
142 match ::cranelift::codegen::verify_function(&func, &flags) {
145 tcx.sess.err(&format!("{:?}", err));
146 let pretty_error = ::cranelift::codegen::print_errors::pretty_verifier_error(
149 Some(Box::new(&writer)),
153 .fatal(&format!("cranelift verify error:\n{}", pretty_error));
158 fn codegen_fn_content<'a, 'tcx: 'a>(fx: &mut FunctionCx<'a, 'tcx, impl Backend>) {
159 for (bb, bb_data) in fx.mir.basic_blocks().iter_enumerated() {
160 if bb_data.is_cleanup {
161 // Unwinding after panicking is not supported
165 let ebb = fx.get_ebb(bb);
166 fx.bcx.switch_to_block(ebb);
169 for stmt in &bb_data.statements {
170 fx.set_debug_loc(stmt.source_info);
171 trans_stmt(fx, ebb, stmt);
174 #[cfg(debug_assertions)]
176 let mut terminator_head = "\n".to_string();
180 .fmt_head(&mut terminator_head)
182 let inst = fx.bcx.func.layout.last_inst(ebb).unwrap();
183 fx.add_comment(inst, terminator_head);
186 fx.set_debug_loc(bb_data.terminator().source_info);
188 match &bb_data.terminator().kind {
189 TerminatorKind::Goto { target } => {
190 let ebb = fx.get_ebb(*target);
191 fx.bcx.ins().jump(ebb, &[]);
193 TerminatorKind::Return => {
194 crate::abi::codegen_return(fx);
196 TerminatorKind::Assert {
203 let cond = trans_operand(fx, cond).load_scalar(fx);
204 // TODO HACK brz/brnz for i8/i16 is not yet implemented
205 let cond = fx.bcx.ins().uextend(types::I32, cond);
206 let target = fx.get_ebb(*target);
208 fx.bcx.ins().brnz(cond, target, &[]);
210 fx.bcx.ins().brz(cond, target, &[]);
212 trap_panic(&mut fx.bcx);
215 TerminatorKind::SwitchInt {
221 let discr = trans_operand(fx, discr).load_scalar(fx);
222 let mut switch = ::cranelift::frontend::Switch::new();
223 for (i, value) in values.iter().enumerate() {
224 let ebb = fx.get_ebb(targets[i]);
225 switch.set_entry(*value as u64, ebb);
227 let otherwise_ebb = fx.get_ebb(targets[targets.len() - 1]);
228 switch.emit(&mut fx.bcx, discr, otherwise_ebb);
230 TerminatorKind::Call {
237 crate::abi::codegen_terminator_call(fx, func, args, destination);
239 TerminatorKind::Resume | TerminatorKind::Abort | TerminatorKind::Unreachable => {
240 trap_unreachable(&mut fx.bcx);
242 TerminatorKind::Yield { .. }
243 | TerminatorKind::FalseEdges { .. }
244 | TerminatorKind::FalseUnwind { .. }
245 | TerminatorKind::DropAndReplace { .. }
246 | TerminatorKind::GeneratorDrop => {
247 bug!("shouldn't exist at trans {:?}", bb_data.terminator());
249 TerminatorKind::Drop {
254 let ty = location.ty(fx.mir, fx.tcx).to_ty(fx.tcx);
255 let ty = fx.monomorphize(&ty);
256 let drop_fn = crate::rustc_mir::monomorphize::resolve_drop_in_place(fx.tcx, ty);
258 if let ty::InstanceDef::DropGlue(_, None) = drop_fn.def {
259 // we don't actually need to drop anything
261 let drop_place = trans_place(fx, location);
262 let drop_fn_ty = drop_fn.ty(fx.tcx);
265 crate::abi::codegen_drop(fx, drop_place, drop_fn_ty);
268 let arg_place = CPlace::new_stack_slot(
271 &ty::RegionKind::ReErased,
274 mutbl: crate::rustc::hir::Mutability::MutMutable,
278 drop_place.write_place_ref(fx, arg_place);
279 let arg_value = arg_place.to_cvalue(fx);
280 crate::abi::codegen_call_inner(
291 let target_ebb = fx.get_ebb(*target);
292 fx.bcx.ins().jump(target_ebb, &[]);
297 fx.bcx.seal_all_blocks();
301 fn trans_stmt<'a, 'tcx: 'a>(
302 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
304 stmt: &Statement<'tcx>,
306 let _print_guard = PrintOnPanic(|| format!("stmt {:?}", stmt));
308 fx.set_debug_loc(stmt.source_info);
310 #[cfg(debug_assertions)]
312 StatementKind::StorageLive(..) | StatementKind::StorageDead(..) => {} // Those are not very useful
314 let inst = fx.bcx.func.layout.last_inst(cur_ebb).unwrap();
315 fx.add_comment(inst, format!("{:?}", stmt));
320 StatementKind::SetDiscriminant {
324 let place = trans_place(fx, place);
325 let layout = place.layout();
326 if layout.for_variant(&*fx, *variant_index).abi == layout::Abi::Uninhabited {
329 match layout.variants {
330 layout::Variants::Single { index } => {
331 assert_eq!(index, *variant_index);
333 layout::Variants::Tagged { .. } => {
334 let ptr = place.place_field(fx, mir::Field::new(0));
339 .discriminant_for_variant(fx.tcx, *variant_index)
341 let discr = CValue::const_val(fx, ptr.layout().ty, to as u64 as i64);
342 ptr.write_cvalue(fx, discr);
344 layout::Variants::NicheFilling {
350 if *variant_index != dataful_variant {
351 let niche = place.place_field(fx, mir::Field::new(0));
352 //let niche_llty = niche.layout.immediate_llvm_type(bx.cx);
354 ((variant_index.as_u32() - niche_variants.start().as_u32()) as u128)
355 .wrapping_add(niche_start);
356 // FIXME(eddyb) Check the actual primitive type here.
357 let niche_llval = if niche_value == 0 {
358 CValue::const_val(fx, niche.layout().ty, 0)
360 CValue::const_val(fx, niche.layout().ty, niche_value as u64 as i64)
362 niche.write_cvalue(fx, niche_llval);
367 StatementKind::Assign(to_place, rval) => {
368 let lval = trans_place(fx, to_place);
369 let dest_layout = lval.layout();
371 Rvalue::Use(operand) => {
372 let val = trans_operand(fx, operand);
373 lval.write_cvalue(fx, val);
375 Rvalue::Ref(_, _, place) => {
376 let place = trans_place(fx, place);
377 place.write_place_ref(fx, lval);
379 Rvalue::BinaryOp(bin_op, lhs, rhs) => {
380 let ty = fx.monomorphize(&lhs.ty(fx.mir, fx.tcx));
381 let lhs = trans_operand(fx, lhs);
382 let rhs = trans_operand(fx, rhs);
384 let res = match ty.sty {
385 ty::Bool => trans_bool_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
387 trans_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, false)
390 trans_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, true)
392 ty::Float(_) => trans_float_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
393 ty::Char => trans_char_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
394 ty::RawPtr(..) => trans_ptr_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
395 ty::FnPtr(..) => trans_ptr_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
396 _ => unimplemented!("binop {:?} for {:?}", bin_op, ty),
398 lval.write_cvalue(fx, res);
400 Rvalue::CheckedBinaryOp(bin_op, lhs, rhs) => {
401 let ty = fx.monomorphize(&lhs.ty(fx.mir, fx.tcx));
402 let lhs = trans_operand(fx, lhs);
403 let rhs = trans_operand(fx, rhs);
405 let res = match ty.sty {
407 trans_checked_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, false)
410 trans_checked_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, true)
412 _ => unimplemented!("checked binop {:?} for {:?}", bin_op, ty),
414 lval.write_cvalue(fx, res);
416 Rvalue::UnaryOp(un_op, operand) => {
417 let operand = trans_operand(fx, operand);
418 let layout = operand.layout();
419 let val = operand.load_scalar(fx);
420 let res = match un_op {
422 match layout.ty.sty {
424 let val = fx.bcx.ins().uextend(types::I32, val); // WORKAROUND for CraneStation/cranelift#466
425 let res = fx.bcx.ins().icmp_imm(IntCC::Equal, val, 0);
426 fx.bcx.ins().bint(types::I8, res)
428 ty::Uint(_) | ty::Int(_) => fx.bcx.ins().bnot(val),
429 _ => unimplemented!("un op Not for {:?}", layout.ty),
432 UnOp::Neg => match layout.ty.sty {
434 let clif_ty = fx.clif_type(layout.ty).unwrap();
435 let zero = fx.bcx.ins().iconst(clif_ty, 0);
436 fx.bcx.ins().isub(zero, val)
438 ty::Float(_) => fx.bcx.ins().fneg(val),
439 _ => unimplemented!("un op Neg for {:?}", layout.ty),
442 lval.write_cvalue(fx, CValue::ByVal(res, layout));
444 Rvalue::Cast(CastKind::ReifyFnPointer, operand, ty) => {
445 let layout = fx.layout_of(ty);
447 .monomorphize(&operand.ty(&fx.mir.local_decls, fx.tcx))
450 ty::FnDef(def_id, substs) => {
451 let func_ref = fx.get_function_ref(
452 Instance::resolve(fx.tcx, ParamEnv::reveal_all(), def_id, substs)
455 let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
456 lval.write_cvalue(fx, CValue::ByVal(func_addr, layout));
458 _ => bug!("Trying to ReifyFnPointer on non FnDef {:?}", ty),
461 Rvalue::Cast(CastKind::UnsafeFnPointer, operand, ty) => {
462 let operand = trans_operand(fx, operand);
463 let layout = fx.layout_of(ty);
464 lval.write_cvalue(fx, operand.unchecked_cast_to(layout));
466 Rvalue::Cast(CastKind::Misc, operand, to_ty) => {
467 let operand = trans_operand(fx, operand);
468 let from_ty = operand.layout().ty;
469 match (&from_ty.sty, &to_ty.sty) {
470 (ty::Ref(..), ty::Ref(..))
471 | (ty::Ref(..), ty::RawPtr(..))
472 | (ty::RawPtr(..), ty::Ref(..))
473 | (ty::RawPtr(..), ty::RawPtr(..))
474 | (ty::FnPtr(..), ty::RawPtr(..)) => {
475 lval.write_cvalue(fx, operand.unchecked_cast_to(dest_layout));
477 (ty::RawPtr(..), ty::Uint(_))
478 | (ty::RawPtr(..), ty::Int(_))
479 | (ty::FnPtr(..), ty::Uint(_))
480 if to_ty.sty == fx.tcx.types.usize.sty
481 || to_ty.sty == fx.tcx.types.isize.sty
482 || fx.clif_type(to_ty).unwrap() == pointer_ty(fx.tcx) =>
484 lval.write_cvalue(fx, operand.unchecked_cast_to(dest_layout));
486 (ty::Uint(_), ty::RawPtr(..)) if from_ty.sty == fx.tcx.types.usize.sty => {
487 lval.write_cvalue(fx, operand.unchecked_cast_to(dest_layout));
489 (ty::Int(_), ty::RawPtr(..)) if from_ty.sty == fx.tcx.types.isize.sty => {
490 lval.write_cvalue(fx, operand.unchecked_cast_to(dest_layout));
492 (ty::Char, ty::Uint(_))
493 | (ty::Uint(_), ty::Char)
494 | (ty::Uint(_), ty::Int(_))
495 | (ty::Uint(_), ty::Uint(_)) => {
496 let from = operand.load_scalar(fx);
497 let res = crate::common::clif_intcast(
500 fx.clif_type(to_ty).unwrap(),
503 lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
505 (ty::Int(_), ty::Int(_)) | (ty::Int(_), ty::Uint(_)) => {
506 let from = operand.load_scalar(fx);
507 let res = crate::common::clif_intcast(
510 fx.clif_type(to_ty).unwrap(),
513 lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
515 (ty::Float(from_flt), ty::Float(to_flt)) => {
516 let from = operand.load_scalar(fx);
517 let res = match (from_flt, to_flt) {
518 (FloatTy::F32, FloatTy::F64) => {
519 fx.bcx.ins().fpromote(types::F64, from)
521 (FloatTy::F64, FloatTy::F32) => {
522 fx.bcx.ins().fdemote(types::F32, from)
526 lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
528 (ty::Float(_), ty::Int(_)) => {
529 let from = operand.load_scalar(fx);
530 let i_type = fx.clif_type(to_ty).unwrap();
531 let res = fx.bcx.ins().fcvt_to_sint_sat(i_type, from);
532 lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
534 (ty::Float(_), ty::Uint(_)) => {
535 let from = operand.load_scalar(fx);
536 let i_type = fx.clif_type(to_ty).unwrap();
537 let res = fx.bcx.ins().fcvt_to_uint_sat(i_type, from);
538 lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
540 (ty::Int(_), ty::Float(_)) => {
541 let from_ty = fx.clif_type(from_ty).unwrap();
542 let from = operand.load_scalar(fx);
543 // FIXME missing encoding for fcvt_from_sint.f32.i8
544 let from = if from_ty == types::I8 || from_ty == types::I16 {
545 fx.bcx.ins().sextend(types::I32, from)
549 let f_type = fx.clif_type(to_ty).unwrap();
550 let res = fx.bcx.ins().fcvt_from_sint(f_type, from);
551 lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
553 (ty::Uint(_), ty::Float(_)) => {
554 let from_ty = fx.clif_type(from_ty).unwrap();
555 let from = operand.load_scalar(fx);
556 // FIXME missing encoding for fcvt_from_uint.f32.i8
557 let from = if from_ty == types::I8 || from_ty == types::I16 {
558 fx.bcx.ins().uextend(types::I32, from)
562 let f_type = fx.clif_type(to_ty).unwrap();
563 let res = fx.bcx.ins().fcvt_from_uint(f_type, from);
564 lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
566 (ty::Bool, ty::Uint(_)) | (ty::Bool, ty::Int(_)) => {
567 let to_ty = fx.clif_type(to_ty).unwrap();
568 let from = operand.load_scalar(fx);
569 let res = if to_ty != types::I8 {
570 fx.bcx.ins().uextend(to_ty, from)
574 lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
576 (ty::Adt(adt_def, _substs), ty::Uint(_))
577 | (ty::Adt(adt_def, _substs), ty::Int(_))
578 if adt_def.is_enum() =>
580 // FIXME avoid forcing to stack
582 CPlace::Addr(operand.force_stack(fx), None, operand.layout());
583 let discr = trans_get_discriminant(fx, place, fx.layout_of(to_ty));
584 lval.write_cvalue(fx, discr);
586 _ => unimpl!("rval misc {:?} {:?}", from_ty, to_ty),
589 Rvalue::Cast(CastKind::ClosureFnPointer, operand, ty) => {
590 unimplemented!("rval closure_fn_ptr {:?} {:?}", operand, ty)
592 Rvalue::Cast(CastKind::Unsize, operand, _ty) => {
593 let operand = trans_operand(fx, operand);
594 operand.unsize_value(fx, lval);
596 Rvalue::Discriminant(place) => {
597 let place = trans_place(fx, place);
598 let discr = trans_get_discriminant(fx, place, dest_layout);
599 lval.write_cvalue(fx, discr);
601 Rvalue::Repeat(operand, times) => {
602 let operand = trans_operand(fx, operand);
604 let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64);
605 let to = lval.place_index(fx, index);
606 to.write_cvalue(fx, operand);
609 Rvalue::Len(place) => {
610 let place = trans_place(fx, place);
611 let usize_layout = fx.layout_of(fx.tcx.types.usize);
612 let len = codegen_array_len(fx, place);
613 lval.write_cvalue(fx, CValue::ByVal(len, usize_layout));
615 Rvalue::NullaryOp(NullOp::Box, content_ty) => {
616 use rustc::middle::lang_items::ExchangeMallocFnLangItem;
618 let usize_type = fx.clif_type(fx.tcx.types.usize).unwrap();
619 let layout = fx.layout_of(content_ty);
620 let llsize = fx.bcx.ins().iconst(usize_type, layout.size.bytes() as i64);
624 .iconst(usize_type, layout.align.abi.bytes() as i64);
625 let box_layout = fx.layout_of(fx.tcx.mk_box(content_ty));
628 let def_id = match fx.tcx.lang_items().require(ExchangeMallocFnLangItem) {
633 .fatal(&format!("allocation of `{}` {}", box_layout.ty, s));
636 let instance = ty::Instance::mono(fx.tcx, def_id);
637 let func_ref = fx.get_function_ref(instance);
638 let call = fx.bcx.ins().call(func_ref, &[llsize, llalign]);
639 let ptr = fx.bcx.inst_results(call)[0];
640 lval.write_cvalue(fx, CValue::ByVal(ptr, box_layout));
642 Rvalue::NullaryOp(NullOp::SizeOf, ty) => {
646 .is_sized(fx.tcx.at(DUMMY_SP), ParamEnv::reveal_all()));
647 let ty_size = fx.layout_of(ty).size.bytes();
648 let val = CValue::const_val(fx, fx.tcx.types.usize, ty_size as i64);
649 lval.write_cvalue(fx, val);
651 Rvalue::Aggregate(kind, operands) => match **kind {
652 AggregateKind::Array(_ty) => {
653 for (i, operand) in operands.into_iter().enumerate() {
654 let operand = trans_operand(fx, operand);
655 let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64);
656 let to = lval.place_index(fx, index);
657 to.write_cvalue(fx, operand);
660 _ => unimpl!("shouldn't exist at trans {:?}", rval),
664 StatementKind::StorageLive(_)
665 | StatementKind::StorageDead(_)
667 | StatementKind::FakeRead(..)
668 | StatementKind::Retag { .. }
669 | StatementKind::AscribeUserType(..) => {}
671 StatementKind::InlineAsm { .. } => unimpl!("Inline assembly is not supported"),
675 fn codegen_array_len<'a, 'tcx: 'a>(
676 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
679 match place.layout().ty.sty {
680 ty::Array(_elem_ty, len) => {
681 let len = crate::constant::force_eval_const(fx, len).unwrap_usize(fx.tcx) as i64;
682 fx.bcx.ins().iconst(fx.pointer_type, len)
684 ty::Slice(_elem_ty) => place
685 .to_addr_maybe_unsized(fx)
687 .expect("Length metadata for slice place"),
688 _ => bug!("Rvalue::Len({:?})", place),
692 pub fn trans_get_discriminant<'a, 'tcx: 'a>(
693 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
695 dest_layout: TyLayout<'tcx>,
697 let layout = place.layout();
699 if layout.abi == layout::Abi::Uninhabited {
700 trap_unreachable(&mut fx.bcx);
702 match layout.variants {
703 layout::Variants::Single { index } => {
704 let discr_val = layout
707 .map_or(index.as_u32() as u128, |def| {
708 def.discriminant_for_variant(fx.tcx, index).val
710 return CValue::const_val(fx, dest_layout.ty, discr_val as u64 as i64);
712 layout::Variants::Tagged { .. } | layout::Variants::NicheFilling { .. } => {}
715 let discr = place.place_field(fx, mir::Field::new(0)).to_cvalue(fx);
716 let discr_ty = discr.layout().ty;
717 let lldiscr = discr.load_scalar(fx);
718 match layout.variants {
719 layout::Variants::Single { .. } => bug!(),
720 layout::Variants::Tagged { ref tag, .. } => {
721 let signed = match tag.value {
722 layout::Int(_, signed) => signed,
725 let val = clif_intcast(fx, lldiscr, fx.clif_type(dest_layout.ty).unwrap(), signed);
726 return CValue::ByVal(val, dest_layout);
728 layout::Variants::NicheFilling {
734 let niche_llty = fx.clif_type(discr_ty).unwrap();
735 let dest_clif_ty = fx.clif_type(dest_layout.ty).unwrap();
736 if niche_variants.start() == niche_variants.end() {
740 .icmp_imm(IntCC::Equal, lldiscr, niche_start as u64 as i64);
744 .iconst(dest_clif_ty, niche_variants.start().as_u32() as i64);
748 .iconst(dest_clif_ty, dataful_variant.as_u32() as i64);
749 let val = fx.bcx.ins().select(b, if_true, if_false);
750 return CValue::ByVal(val, dest_layout);
752 // Rebase from niche values to discriminant values.
753 let delta = niche_start.wrapping_sub(niche_variants.start().as_u32() as u128);
754 let delta = fx.bcx.ins().iconst(niche_llty, delta as u64 as i64);
755 let lldiscr = fx.bcx.ins().isub(lldiscr, delta);
756 let b = fx.bcx.ins().icmp_imm(
757 IntCC::UnsignedLessThanOrEqual,
759 niche_variants.end().as_u32() as i64,
762 clif_intcast(fx, lldiscr, fx.clif_type(dest_layout.ty).unwrap(), false);
766 .iconst(dest_clif_ty, dataful_variant.as_u32() as i64);
767 let val = fx.bcx.ins().select(b, if_true, if_false);
768 return CValue::ByVal(val, dest_layout);
774 macro_rules! binop_match {
775 (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, bug) => {
776 bug!("binop {} on {} lhs: {:?} rhs: {:?}", stringify!($var), $bug_fmt, $lhs, $rhs)
778 (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, icmp($cc:ident)) => {{
779 assert_eq!($fx.tcx.types.bool, $ret_ty);
780 let ret_layout = $fx.layout_of($ret_ty);
782 let b = $fx.bcx.ins().icmp(IntCC::$cc, $lhs, $rhs);
783 CValue::ByVal($fx.bcx.ins().bint(types::I8, b), ret_layout)
785 (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, fcmp($cc:ident)) => {{
786 assert_eq!($fx.tcx.types.bool, $ret_ty);
787 let ret_layout = $fx.layout_of($ret_ty);
788 let b = $fx.bcx.ins().fcmp(FloatCC::$cc, $lhs, $rhs);
789 CValue::ByVal($fx.bcx.ins().bint(types::I8, b), ret_layout)
791 (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, custom(|| $body:expr)) => {{
794 (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, $name:ident) => {{
795 let ret_layout = $fx.layout_of($ret_ty);
796 CValue::ByVal($fx.bcx.ins().$name($lhs, $rhs), ret_layout)
799 $fx:expr, $bin_op:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, $bug_fmt:expr;
801 $var:ident ($sign:pat) $name:tt $( ( $($next:tt)* ) )? ;
804 let lhs = $lhs.load_scalar($fx);
805 let rhs = $rhs.load_scalar($fx);
806 match ($bin_op, $signed) {
808 (BinOp::$var, $sign) => binop_match!(@single $fx, $bug_fmt, $var, $signed, lhs, rhs, $ret_ty, $name $( ( $($next)* ) )?),
814 fn trans_bool_binop<'a, 'tcx: 'a>(
815 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
821 let res = binop_match! {
822 fx, bin_op, false, lhs, rhs, ty, "bool";
835 Lt (_) icmp(UnsignedLessThan);
836 Le (_) icmp(UnsignedLessThanOrEqual);
837 Ne (_) icmp(NotEqual);
838 Ge (_) icmp(UnsignedGreaterThanOrEqual);
839 Gt (_) icmp(UnsignedGreaterThan);
847 pub fn trans_int_binop<'a, 'tcx: 'a>(
848 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
855 if bin_op != BinOp::Shl && bin_op != BinOp::Shr {
859 "int binop requires lhs and rhs of same type"
863 fx, bin_op, signed, lhs, rhs, out_ty, "int/uint";
879 Lt (false) icmp(UnsignedLessThan);
880 Lt (true) icmp(SignedLessThan);
881 Le (false) icmp(UnsignedLessThanOrEqual);
882 Le (true) icmp(SignedLessThanOrEqual);
883 Ne (_) icmp(NotEqual);
884 Ge (false) icmp(UnsignedGreaterThanOrEqual);
885 Ge (true) icmp(SignedGreaterThanOrEqual);
886 Gt (false) icmp(UnsignedGreaterThan);
887 Gt (true) icmp(SignedGreaterThan);
893 pub fn trans_checked_int_binop<'a, 'tcx: 'a>(
894 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
896 in_lhs: CValue<'tcx>,
897 in_rhs: CValue<'tcx>,
901 if bin_op != BinOp::Shl && bin_op != BinOp::Shr {
905 "checked int binop requires lhs and rhs of same type"
909 let lhs = in_lhs.load_scalar(fx);
910 let rhs = in_rhs.load_scalar(fx);
911 let res = match bin_op {
912 BinOp::Add => fx.bcx.ins().iadd(lhs, rhs),
913 BinOp::Sub => fx.bcx.ins().isub(lhs, rhs),
914 BinOp::Mul => fx.bcx.ins().imul(lhs, rhs),
915 BinOp::Shl => fx.bcx.ins().ishl(lhs, rhs),
918 fx.bcx.ins().ushr(lhs, rhs)
920 fx.bcx.ins().sshr(lhs, rhs)
924 "binop {:?} on checked int/uint lhs: {:?} rhs: {:?}",
931 // TODO: check for overflow
932 let has_overflow = fx.bcx.ins().iconst(types::I8, 0);
934 let out_place = CPlace::new_stack_slot(fx, out_ty);
935 let out_layout = out_place.layout();
936 out_place.write_cvalue(fx, CValue::ByValPair(res, has_overflow, out_layout));
938 out_place.to_cvalue(fx)
941 fn trans_float_binop<'a, 'tcx: 'a>(
942 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
948 let res = binop_match! {
949 fx, bin_op, false, lhs, rhs, ty, "float";
955 assert_eq!(lhs.layout().ty, ty);
956 assert_eq!(rhs.layout().ty, ty);
958 ty::Float(FloatTy::F32) => fx.easy_call("fmodf", &[lhs, rhs], ty),
959 ty::Float(FloatTy::F64) => fx.easy_call("fmod", &[lhs, rhs], ty),
970 Lt (_) fcmp(LessThan);
971 Le (_) fcmp(LessThanOrEqual);
972 Ne (_) fcmp(NotEqual);
973 Ge (_) fcmp(GreaterThanOrEqual);
974 Gt (_) fcmp(GreaterThan);
982 fn trans_char_binop<'a, 'tcx: 'a>(
983 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
989 let res = binop_match! {
990 fx, bin_op, false, lhs, rhs, ty, "char";
1003 Lt (_) icmp(UnsignedLessThan);
1004 Le (_) icmp(UnsignedLessThanOrEqual);
1005 Ne (_) icmp(NotEqual);
1006 Ge (_) icmp(UnsignedGreaterThanOrEqual);
1007 Gt (_) icmp(UnsignedGreaterThan);
1015 fn trans_ptr_binop<'a, 'tcx: 'a>(
1016 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1022 let not_fat = match lhs.layout().ty.sty {
1023 ty::RawPtr(TypeAndMut { ty, mutbl: _ }) => {
1024 ty.is_sized(fx.tcx.at(DUMMY_SP), ParamEnv::reveal_all())
1026 ty::FnPtr(..) => true,
1027 _ => bug!("trans_ptr_binop on non ptr"),
1030 if let BinOp::Offset = bin_op {
1031 let (base, offset) = (lhs, rhs.load_scalar(fx));
1032 let pointee_ty = base.layout().ty.builtin_deref(true).unwrap().ty;
1033 let pointee_size = fx.layout_of(pointee_ty).size.bytes();
1034 let ptr_diff = fx.bcx.ins().imul_imm(offset, pointee_size as i64);
1035 let base_val = base.load_scalar(fx);
1036 let res = fx.bcx.ins().iadd(base_val, ptr_diff);
1037 return CValue::ByVal(res, base.layout());
1041 fx, bin_op, false, lhs, rhs, ret_ty, "ptr";
1054 Lt (_) icmp(UnsignedLessThan);
1055 Le (_) icmp(UnsignedLessThanOrEqual);
1056 Ne (_) icmp(NotEqual);
1057 Ge (_) icmp(UnsignedGreaterThanOrEqual);
1058 Gt (_) icmp(UnsignedGreaterThan);
1060 Offset (_) bug; // Handled above
1063 let (lhs_ptr, lhs_extra) = lhs.load_value_pair(fx);
1064 let (rhs_ptr, rhs_extra) = rhs.load_value_pair(fx);
1065 let res = match bin_op {
1067 let ptr_eq = fx.bcx.ins().icmp(IntCC::Equal, lhs_ptr, rhs_ptr);
1068 let extra_eq = fx.bcx.ins().icmp(IntCC::Equal, lhs_extra, rhs_extra);
1069 fx.bcx.ins().band(ptr_eq, extra_eq)
1072 let ptr_ne = fx.bcx.ins().icmp(IntCC::NotEqual, lhs_ptr, rhs_ptr);
1073 let extra_ne = fx.bcx.ins().icmp(IntCC::NotEqual, lhs_extra, rhs_extra);
1074 fx.bcx.ins().bor(ptr_ne, extra_ne)
1076 _ => unimplemented!(
1077 "trans_ptr_binop({:?}, <fat ptr>, <fat ptr>) not implemented",
1082 assert_eq!(fx.tcx.types.bool, ret_ty);
1083 let ret_layout = fx.layout_of(ret_ty);
1084 CValue::ByVal(fx.bcx.ins().bint(types::I8, res), ret_layout)
1088 pub fn trans_place<'a, 'tcx: 'a>(
1089 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1090 place: &Place<'tcx>,
1093 Place::Local(local) => fx.get_local_place(*local),
1094 Place::Promoted(promoted) => crate::constant::trans_promoted(fx, promoted.0),
1095 Place::Static(static_) => crate::constant::codegen_static_ref(fx, static_),
1096 Place::Projection(projection) => {
1097 let base = trans_place(fx, &projection.base);
1098 match projection.elem {
1099 ProjectionElem::Deref => base.place_deref(fx),
1100 ProjectionElem::Field(field, _ty) => base.place_field(fx, field),
1101 ProjectionElem::Index(local) => {
1102 let index = fx.get_local_place(local).to_cvalue(fx).load_scalar(fx);
1103 base.place_index(fx, index)
1105 ProjectionElem::ConstantIndex {
1110 let index = if !from_end {
1111 fx.bcx.ins().iconst(fx.pointer_type, offset as i64)
1113 let len = codegen_array_len(fx, base);
1114 fx.bcx.ins().iadd_imm(len, -(offset as i64))
1116 base.place_index(fx, index)
1118 ProjectionElem::Subslice { from, to } => unimpl!(
1119 "projection subslice {:?} from {} to {}",
1124 ProjectionElem::Downcast(_adt_def, variant) => base.downcast_variant(fx, variant),
1130 pub fn trans_operand<'a, 'tcx>(
1131 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1132 operand: &Operand<'tcx>,
1135 Operand::Move(place) | Operand::Copy(place) => {
1136 let cplace = trans_place(fx, place);
1137 cplace.to_cvalue(fx)
1139 Operand::Constant(const_) => crate::constant::trans_constant(fx, const_),