1 use rustc::ty::adjustment::PointerCast;
5 pub fn trans_fn<'a, 'clif, 'tcx: 'a, B: Backend + 'static>(
6 cx: &mut crate::CodegenCx<'a, 'clif, 'tcx, B>,
7 instance: Instance<'tcx>,
12 let mir = tcx.instance_mir(instance.def);
14 // Check fn sig for u128 and i128 and replace those functions with a trap.
16 // FIXME implement u128 and i128 support
18 // Check sig for u128 and i128
19 let fn_sig = tcx.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), &instance.fn_sig(tcx));
21 struct UI128Visitor<'a, 'tcx: 'a>(TyCtxt<'a, 'tcx, 'tcx>, bool);
23 impl<'a, 'tcx: 'a> rustc::ty::fold::TypeVisitor<'tcx> for UI128Visitor<'a, 'tcx> {
24 fn visit_ty(&mut self, t: Ty<'tcx>) -> bool {
25 if t.sty == self.0.types.u128.sty || t.sty == self.0.types.i128.sty {
27 return false; // stop visiting
30 t.super_visit_with(self)
34 let mut visitor = UI128Visitor(tcx, false);
35 fn_sig.visit_with(&mut visitor);
37 //If found replace function with a trap.
39 tcx.sess.warn("u128 and i128 are not yet supported. \
40 Functions using these as args will be replaced with a trap.");
42 // Declare function with fake signature
44 params: vec![AbiParam::new(types::INVALID)],
46 call_conv: CallConv::Fast,
48 let name = tcx.symbol_name(instance).as_str();
49 let func_id = cx.module.declare_function(&*name, linkage, &sig).unwrap();
51 // Create trapping function
52 let mut func = Function::with_name_signature(ExternalName::user(0, 0), sig);
53 let mut func_ctx = FunctionBuilderContext::new();
54 let mut bcx = FunctionBuilder::new(&mut func, &mut func_ctx);
55 let start_ebb = bcx.create_ebb();
56 bcx.append_ebb_params_for_function_params(start_ebb);
57 bcx.switch_to_block(start_ebb);
59 let mut fx = FunctionCx {
62 pointer_type: pointer_ty(tcx),
68 ebb_map: HashMap::new(),
69 local_map: HashMap::new(),
71 clif_comments: crate::pretty_clif::CommentWriter::new(tcx, instance),
72 constants: &mut cx.ccx,
73 caches: &mut cx.caches,
74 source_info_set: indexmap::IndexSet::new(),
77 crate::trap::trap_unreachable(&mut fx, "[unimplemented] Called function with u128 or i128 as argument.");
78 fx.bcx.seal_all_blocks();
82 cx.caches.context.func = func;
84 .define_function(func_id, &mut cx.caches.context)
86 cx.caches.context.clear();
92 let (name, sig) = get_function_name_and_sig(tcx, instance, false);
93 let func_id = cx.module.declare_function(&name, linkage, &sig).unwrap();
94 let mut debug_context = cx
97 .map(|debug_context| FunctionDebugContext::new(tcx, debug_context, mir, &name, &sig));
99 // Make FunctionBuilder
100 let mut func = Function::with_name_signature(ExternalName::user(0, 0), sig);
101 let mut func_ctx = FunctionBuilderContext::new();
102 let mut bcx = FunctionBuilder::new(&mut func, &mut func_ctx);
105 let start_ebb = bcx.create_ebb();
106 let mut ebb_map: HashMap<BasicBlock, Ebb> = HashMap::new();
107 for (bb, _bb_data) in mir.basic_blocks().iter_enumerated() {
108 ebb_map.insert(bb, bcx.create_ebb());
112 let pointer_type = cx.module.target_config().pointer_type();
113 let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance);
115 let mut fx = FunctionCx {
125 local_map: HashMap::new(),
128 constants: &mut cx.ccx,
129 caches: &mut cx.caches,
130 source_info_set: indexmap::IndexSet::new(),
133 with_unimpl_span(fx.mir.span, || {
134 crate::abi::codegen_fn_prelude(&mut fx, start_ebb);
135 codegen_fn_content(&mut fx);
138 // Recover all necessary data from fx, before accessing func will prevent future access to it.
139 let instance = fx.instance;
140 let clif_comments = fx.clif_comments;
141 let source_info_set = fx.source_info_set;
143 #[cfg(debug_assertions)]
144 crate::pretty_clif::write_clif_file(cx.tcx, "unopt", instance, &func, &clif_comments, None);
147 verify_func(tcx, &clif_comments, &func);
150 let context = &mut cx.caches.context;
153 .define_function(func_id, context)
156 let value_ranges = context.build_value_labels_ranges(cx.module.isa()).expect("value location ranges");
158 // Write optimized function to file for debugging
159 #[cfg(debug_assertions)]
160 crate::pretty_clif::write_clif_file(cx.tcx, "opt", instance, &context.func, &clif_comments, Some(&value_ranges));
162 // Define debuginfo for function
163 let isa = cx.module.isa();
166 .map(|x| x.define(tcx, context, isa, &source_info_set));
168 // Clear context to make it usable for the next function
172 fn verify_func(tcx: TyCtxt, writer: &crate::pretty_clif::CommentWriter, func: &Function) {
173 let flags = settings::Flags::new(settings::builder());
174 match ::cranelift::codegen::verify_function(&func, &flags) {
177 tcx.sess.err(&format!("{:?}", err));
178 let pretty_error = ::cranelift::codegen::print_errors::pretty_verifier_error(
181 Some(Box::new(writer)),
185 .fatal(&format!("cranelift verify error:\n{}", pretty_error));
190 fn codegen_fn_content<'a, 'tcx: 'a>(fx: &mut FunctionCx<'a, 'tcx, impl Backend>) {
191 for (bb, bb_data) in fx.mir.basic_blocks().iter_enumerated() {
192 if bb_data.is_cleanup {
193 // Unwinding after panicking is not supported
197 let ebb = fx.get_ebb(bb);
198 fx.bcx.switch_to_block(ebb);
201 for stmt in &bb_data.statements {
202 fx.set_debug_loc(stmt.source_info);
203 trans_stmt(fx, ebb, stmt);
206 #[cfg(debug_assertions)]
208 let mut terminator_head = "\n".to_string();
212 .fmt_head(&mut terminator_head)
214 let inst = fx.bcx.func.layout.last_inst(ebb).unwrap();
215 fx.add_comment(inst, terminator_head);
218 fx.set_debug_loc(bb_data.terminator().source_info);
220 match &bb_data.terminator().kind {
221 TerminatorKind::Goto { target } => {
222 let ebb = fx.get_ebb(*target);
223 fx.bcx.ins().jump(ebb, &[]);
225 TerminatorKind::Return => {
226 crate::abi::codegen_return(fx);
228 TerminatorKind::Assert {
235 let cond = trans_operand(fx, cond).load_scalar(fx);
236 // TODO HACK brz/brnz for i8/i16 is not yet implemented
237 let cond = fx.bcx.ins().uextend(types::I32, cond);
238 let target = fx.get_ebb(*target);
240 fx.bcx.ins().brnz(cond, target, &[]);
242 fx.bcx.ins().brz(cond, target, &[]);
244 trap_panic(fx, format!("[panic] Assert {:?} failed.", msg));
247 TerminatorKind::SwitchInt {
253 let discr = trans_operand(fx, discr).load_scalar(fx);
254 let mut switch = ::cranelift::frontend::Switch::new();
255 for (i, value) in values.iter().enumerate() {
256 let ebb = fx.get_ebb(targets[i]);
257 switch.set_entry(*value as u64, ebb);
259 let otherwise_ebb = fx.get_ebb(targets[targets.len() - 1]);
260 switch.emit(&mut fx.bcx, discr, otherwise_ebb);
262 TerminatorKind::Call {
269 crate::abi::codegen_terminator_call(fx, func, args, destination);
271 TerminatorKind::Resume | TerminatorKind::Abort => {
272 trap_unreachable(fx, "[corruption] Unwinding bb reached.");
274 TerminatorKind::Unreachable => {
275 trap_unreachable(fx, "[corruption] Hit unreachable code.");
277 TerminatorKind::Yield { .. }
278 | TerminatorKind::FalseEdges { .. }
279 | TerminatorKind::FalseUnwind { .. }
280 | TerminatorKind::DropAndReplace { .. }
281 | TerminatorKind::GeneratorDrop => {
282 bug!("shouldn't exist at trans {:?}", bb_data.terminator());
284 TerminatorKind::Drop {
289 let ty = location.ty(fx.mir, fx.tcx).ty;
290 let ty = fx.monomorphize(&ty);
291 let drop_fn = Instance::resolve_drop_in_place(fx.tcx, ty);
293 if let ty::InstanceDef::DropGlue(_, None) = drop_fn.def {
294 // we don't actually need to drop anything
296 let drop_place = trans_place(fx, location);
297 let drop_fn_ty = drop_fn.ty(fx.tcx);
300 crate::abi::codegen_drop(fx, drop_place, drop_fn_ty);
303 let arg_place = CPlace::new_stack_slot(
306 &ty::RegionKind::ReErased,
309 mutbl: crate::rustc::hir::Mutability::MutMutable,
313 drop_place.write_place_ref(fx, arg_place);
314 let arg_value = arg_place.to_cvalue(fx);
315 crate::abi::codegen_call_inner(
326 let target_ebb = fx.get_ebb(*target);
327 fx.bcx.ins().jump(target_ebb, &[]);
332 fx.bcx.seal_all_blocks();
336 fn trans_stmt<'a, 'tcx: 'a>(
337 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
339 stmt: &Statement<'tcx>,
341 let _print_guard = PrintOnPanic(|| format!("stmt {:?}", stmt));
343 fx.set_debug_loc(stmt.source_info);
345 #[cfg(debug_assertions)]
347 StatementKind::StorageLive(..) | StatementKind::StorageDead(..) => {} // Those are not very useful
349 let inst = fx.bcx.func.layout.last_inst(cur_ebb).unwrap();
350 fx.add_comment(inst, format!("{:?}", stmt));
355 StatementKind::SetDiscriminant {
359 let place = trans_place(fx, place);
360 let layout = place.layout();
361 if layout.for_variant(&*fx, *variant_index).abi == layout::Abi::Uninhabited {
364 match layout.variants {
365 layout::Variants::Single { index } => {
366 assert_eq!(index, *variant_index);
368 layout::Variants::Multiple {
371 discr_kind: layout::DiscriminantKind::Tag,
374 let ptr = place.place_field(fx, mir::Field::new(discr_index));
379 .discriminant_for_variant(fx.tcx, *variant_index)
381 let discr = CValue::const_val(fx, ptr.layout().ty, to as u64 as i64);
382 ptr.write_cvalue(fx, discr);
384 layout::Variants::Multiple {
387 discr_kind: layout::DiscriminantKind::Niche {
394 if *variant_index != dataful_variant {
395 let niche = place.place_field(fx, mir::Field::new(discr_index));
396 //let niche_llty = niche.layout.immediate_llvm_type(bx.cx);
398 ((variant_index.as_u32() - niche_variants.start().as_u32()) as u128)
399 .wrapping_add(niche_start);
400 // FIXME(eddyb) Check the actual primitive type here.
401 let niche_llval = if niche_value == 0 {
402 CValue::const_val(fx, niche.layout().ty, 0)
404 CValue::const_val(fx, niche.layout().ty, niche_value as u64 as i64)
406 niche.write_cvalue(fx, niche_llval);
411 StatementKind::Assign(to_place, rval) => {
412 let lval = trans_place(fx, to_place);
413 let dest_layout = lval.layout();
415 Rvalue::Use(operand) => {
416 let val = trans_operand(fx, operand);
417 lval.write_cvalue(fx, val);
419 Rvalue::Ref(_, _, place) => {
420 let place = trans_place(fx, place);
421 place.write_place_ref(fx, lval);
423 Rvalue::BinaryOp(bin_op, lhs, rhs) => {
424 let ty = fx.monomorphize(&lhs.ty(fx.mir, fx.tcx));
425 let lhs = trans_operand(fx, lhs);
426 let rhs = trans_operand(fx, rhs);
428 let res = match ty.sty {
429 ty::Bool => trans_bool_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
431 trans_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, false)
434 trans_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, true)
436 ty::Float(_) => trans_float_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
437 ty::Char => trans_char_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
438 ty::RawPtr(..) => trans_ptr_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
439 ty::FnPtr(..) => trans_ptr_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
440 _ => unimplemented!("binop {:?} for {:?}", bin_op, ty),
442 lval.write_cvalue(fx, res);
444 Rvalue::CheckedBinaryOp(bin_op, lhs, rhs) => {
445 let ty = fx.monomorphize(&lhs.ty(fx.mir, fx.tcx));
446 let lhs = trans_operand(fx, lhs);
447 let rhs = trans_operand(fx, rhs);
449 let res = match ty.sty {
451 trans_checked_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, false)
454 trans_checked_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, true)
456 _ => unimplemented!("checked binop {:?} for {:?}", bin_op, ty),
458 lval.write_cvalue(fx, res);
460 Rvalue::UnaryOp(un_op, operand) => {
461 let operand = trans_operand(fx, operand);
462 let layout = operand.layout();
463 let val = operand.load_scalar(fx);
464 let res = match un_op {
466 match layout.ty.sty {
468 let val = fx.bcx.ins().uextend(types::I32, val); // WORKAROUND for CraneStation/cranelift#466
469 let res = fx.bcx.ins().icmp_imm(IntCC::Equal, val, 0);
470 fx.bcx.ins().bint(types::I8, res)
472 ty::Uint(_) | ty::Int(_) => fx.bcx.ins().bnot(val),
473 _ => unimplemented!("un op Not for {:?}", layout.ty),
476 UnOp::Neg => match layout.ty.sty {
478 let clif_ty = fx.clif_type(layout.ty).unwrap();
479 let zero = fx.bcx.ins().iconst(clif_ty, 0);
480 fx.bcx.ins().isub(zero, val)
482 ty::Float(_) => fx.bcx.ins().fneg(val),
483 _ => unimplemented!("un op Neg for {:?}", layout.ty),
486 lval.write_cvalue(fx, CValue::by_val(res, layout));
488 Rvalue::Cast(CastKind::Pointer(PointerCast::ReifyFnPointer), operand, ty) => {
489 let layout = fx.layout_of(ty);
491 .monomorphize(&operand.ty(&fx.mir.local_decls, fx.tcx))
494 ty::FnDef(def_id, substs) => {
495 let func_ref = fx.get_function_ref(
496 Instance::resolve(fx.tcx, ParamEnv::reveal_all(), def_id, substs)
499 let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
500 lval.write_cvalue(fx, CValue::by_val(func_addr, layout));
502 _ => bug!("Trying to ReifyFnPointer on non FnDef {:?}", ty),
505 Rvalue::Cast(CastKind::Pointer(PointerCast::UnsafeFnPointer), operand, ty)
506 | Rvalue::Cast(CastKind::Pointer(PointerCast::MutToConstPointer), operand, ty) => {
507 let operand = trans_operand(fx, operand);
508 let layout = fx.layout_of(ty);
509 lval.write_cvalue(fx, operand.unchecked_cast_to(layout));
511 Rvalue::Cast(CastKind::Misc, operand, to_ty) => {
512 let operand = trans_operand(fx, operand);
513 let from_ty = operand.layout().ty;
515 fn is_fat_ptr<'a, 'tcx: 'a>(fx: &FunctionCx<'a, 'tcx, impl Backend>, ty: Ty<'tcx>) -> bool {
518 .map(|ty::TypeAndMut {ty: pointee_ty, mutbl: _ }| fx.layout_of(pointee_ty).is_unsized())
522 if is_fat_ptr(fx, from_ty) {
523 if is_fat_ptr(fx, to_ty) {
524 // fat-ptr -> fat-ptr
525 lval.write_cvalue(fx, operand.unchecked_cast_to(dest_layout));
527 // fat-ptr -> thin-ptr
528 let (ptr, _extra) = operand.load_scalar_pair(fx);
529 lval.write_cvalue(fx, CValue::by_val(ptr, dest_layout))
531 } else if let ty::Adt(adt_def, _substs) = from_ty.sty {
532 // enum -> discriminant value
533 assert!(adt_def.is_enum());
535 ty::Uint(_) | ty::Int(_) => {},
536 _ => unreachable!("cast adt {} -> {}", from_ty, to_ty),
539 // FIXME avoid forcing to stack
541 CPlace::for_addr(operand.force_stack(fx), operand.layout());
542 let discr = trans_get_discriminant(fx, place, fx.layout_of(to_ty));
543 lval.write_cvalue(fx, discr);
545 let from_clif_ty = fx.clif_type(from_ty).unwrap();
546 let to_clif_ty = fx.clif_type(to_ty).unwrap();
547 let from = operand.load_scalar(fx);
549 let signed = match from_ty.sty {
550 ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..) | ty::Char | ty::Uint(..) | ty::Bool => false,
552 ty::Float(..) => false, // `signed` is unused for floats
553 _ => panic!("{}", from_ty),
556 let res = if from_clif_ty.is_int() && to_clif_ty.is_int() {
557 // int-like -> int-like
558 crate::common::clif_intcast(
564 } else if from_clif_ty.is_int() && to_clif_ty.is_float() {
567 fx.bcx.ins().fcvt_from_sint(to_clif_ty, from)
569 fx.bcx.ins().fcvt_from_uint(to_clif_ty, from)
571 } else if from_clif_ty.is_float() && to_clif_ty.is_int() {
573 let from = operand.load_scalar(fx);
575 fx.bcx.ins().fcvt_to_sint_sat(to_clif_ty, from)
577 fx.bcx.ins().fcvt_to_uint_sat(to_clif_ty, from)
579 } else if from_clif_ty.is_float() && to_clif_ty.is_float() {
581 match (from_clif_ty, to_clif_ty) {
582 (types::F32, types::F64) => {
583 fx.bcx.ins().fpromote(types::F64, from)
585 (types::F64, types::F32) => {
586 fx.bcx.ins().fdemote(types::F32, from)
591 unimpl!("rval misc {:?} {:?}", from_ty, to_ty)
593 lval.write_cvalue(fx, CValue::by_val(res, dest_layout));
596 Rvalue::Cast(CastKind::Pointer(PointerCast::ClosureFnPointer(_)), operand, _ty) => {
597 let operand = trans_operand(fx, operand);
598 match operand.layout().ty.sty {
599 ty::Closure(def_id, substs) => {
600 let instance = Instance::resolve_closure(
604 ty::ClosureKind::FnOnce,
606 let func_ref = fx.get_function_ref(instance);
607 let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
608 lval.write_cvalue(fx, CValue::by_val(func_addr, lval.layout()));
611 bug!("{} cannot be cast to a fn ptr", operand.layout().ty)
615 Rvalue::Cast(CastKind::Pointer(PointerCast::Unsize), operand, _ty) => {
616 let operand = trans_operand(fx, operand);
617 operand.unsize_value(fx, lval);
619 Rvalue::Discriminant(place) => {
620 let place = trans_place(fx, place);
621 let discr = trans_get_discriminant(fx, place, dest_layout);
622 lval.write_cvalue(fx, discr);
624 Rvalue::Repeat(operand, times) => {
625 let operand = trans_operand(fx, operand);
627 let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64);
628 let to = lval.place_index(fx, index);
629 to.write_cvalue(fx, operand);
632 Rvalue::Len(place) => {
633 let place = trans_place(fx, place);
634 let usize_layout = fx.layout_of(fx.tcx.types.usize);
635 let len = codegen_array_len(fx, place);
636 lval.write_cvalue(fx, CValue::by_val(len, usize_layout));
638 Rvalue::NullaryOp(NullOp::Box, content_ty) => {
639 use rustc::middle::lang_items::ExchangeMallocFnLangItem;
641 let usize_type = fx.clif_type(fx.tcx.types.usize).unwrap();
642 let layout = fx.layout_of(content_ty);
643 let llsize = fx.bcx.ins().iconst(usize_type, layout.size.bytes() as i64);
647 .iconst(usize_type, layout.align.abi.bytes() as i64);
648 let box_layout = fx.layout_of(fx.tcx.mk_box(content_ty));
651 let def_id = match fx.tcx.lang_items().require(ExchangeMallocFnLangItem) {
656 .fatal(&format!("allocation of `{}` {}", box_layout.ty, s));
659 let instance = ty::Instance::mono(fx.tcx, def_id);
660 let func_ref = fx.get_function_ref(instance);
661 let call = fx.bcx.ins().call(func_ref, &[llsize, llalign]);
662 let ptr = fx.bcx.inst_results(call)[0];
663 lval.write_cvalue(fx, CValue::by_val(ptr, box_layout));
665 Rvalue::NullaryOp(NullOp::SizeOf, ty) => {
669 .is_sized(fx.tcx.at(DUMMY_SP), ParamEnv::reveal_all()));
670 let ty_size = fx.layout_of(ty).size.bytes();
671 let val = CValue::const_val(fx, fx.tcx.types.usize, ty_size as i64);
672 lval.write_cvalue(fx, val);
674 Rvalue::Aggregate(kind, operands) => match **kind {
675 AggregateKind::Array(_ty) => {
676 for (i, operand) in operands.into_iter().enumerate() {
677 let operand = trans_operand(fx, operand);
678 let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64);
679 let to = lval.place_index(fx, index);
680 to.write_cvalue(fx, operand);
683 _ => unimpl!("shouldn't exist at trans {:?}", rval),
687 StatementKind::StorageLive(_)
688 | StatementKind::StorageDead(_)
690 | StatementKind::FakeRead(..)
691 | StatementKind::Retag { .. }
692 | StatementKind::AscribeUserType(..) => {}
694 StatementKind::InlineAsm { .. } => unimpl!("Inline assembly is not supported"),
698 fn codegen_array_len<'a, 'tcx: 'a>(
699 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
702 match place.layout().ty.sty {
703 ty::Array(_elem_ty, len) => {
704 let len = crate::constant::force_eval_const(fx, len).unwrap_usize(fx.tcx) as i64;
705 fx.bcx.ins().iconst(fx.pointer_type, len)
707 ty::Slice(_elem_ty) => place
708 .to_addr_maybe_unsized(fx)
710 .expect("Length metadata for slice place"),
711 _ => bug!("Rvalue::Len({:?})", place),
715 pub fn trans_get_discriminant<'a, 'tcx: 'a>(
716 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
718 dest_layout: TyLayout<'tcx>,
720 let layout = place.layout();
722 if layout.abi == layout::Abi::Uninhabited {
723 return trap_unreachable_ret_value(fx, dest_layout, "[panic] Tried to get discriminant for uninhabited type.");
726 let (discr_scalar, discr_index, discr_kind) = match &layout.variants {
727 layout::Variants::Single { index } => {
728 let discr_val = layout
731 .map_or(index.as_u32() as u128, |def| {
732 def.discriminant_for_variant(fx.tcx, *index).val
734 return CValue::const_val(fx, dest_layout.ty, discr_val as u64 as i64);
736 layout::Variants::Multiple { discr, discr_index, discr_kind, variants: _ } => {
737 (discr, *discr_index, discr_kind)
741 let discr = place.place_field(fx, mir::Field::new(discr_index)).to_cvalue(fx);
742 let discr_ty = discr.layout().ty;
743 let lldiscr = discr.load_scalar(fx);
745 layout::DiscriminantKind::Tag => {
746 let signed = match discr_scalar.value {
747 layout::Int(_, signed) => signed,
750 let val = clif_intcast(fx, lldiscr, fx.clif_type(dest_layout.ty).unwrap(), signed);
751 return CValue::by_val(val, dest_layout);
753 layout::DiscriminantKind::Niche {
758 let niche_llty = fx.clif_type(discr_ty).unwrap();
759 let dest_clif_ty = fx.clif_type(dest_layout.ty).unwrap();
760 if niche_variants.start() == niche_variants.end() {
764 .icmp_imm(IntCC::Equal, lldiscr, *niche_start as u64 as i64);
768 .iconst(dest_clif_ty, niche_variants.start().as_u32() as i64);
772 .iconst(dest_clif_ty, dataful_variant.as_u32() as i64);
773 let val = fx.bcx.ins().select(b, if_true, if_false);
774 return CValue::by_val(val, dest_layout);
776 // Rebase from niche values to discriminant values.
777 let delta = niche_start.wrapping_sub(niche_variants.start().as_u32() as u128);
778 let delta = fx.bcx.ins().iconst(niche_llty, delta as u64 as i64);
779 let lldiscr = fx.bcx.ins().isub(lldiscr, delta);
780 let b = fx.bcx.ins().icmp_imm(
781 IntCC::UnsignedLessThanOrEqual,
783 niche_variants.end().as_u32() as i64,
786 clif_intcast(fx, lldiscr, fx.clif_type(dest_layout.ty).unwrap(), false);
790 .iconst(dest_clif_ty, dataful_variant.as_u32() as i64);
791 let val = fx.bcx.ins().select(b, if_true, if_false);
792 return CValue::by_val(val, dest_layout);
798 macro_rules! binop_match {
799 (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, bug) => {
800 bug!("binop {} on {} lhs: {:?} rhs: {:?}", stringify!($var), $bug_fmt, $lhs, $rhs)
802 (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, icmp($cc:ident)) => {{
803 assert_eq!($fx.tcx.types.bool, $ret_ty);
804 let ret_layout = $fx.layout_of($ret_ty);
806 let b = $fx.bcx.ins().icmp(IntCC::$cc, $lhs, $rhs);
807 CValue::by_val($fx.bcx.ins().bint(types::I8, b), ret_layout)
809 (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, fcmp($cc:ident)) => {{
810 assert_eq!($fx.tcx.types.bool, $ret_ty);
811 let ret_layout = $fx.layout_of($ret_ty);
812 let b = $fx.bcx.ins().fcmp(FloatCC::$cc, $lhs, $rhs);
813 CValue::by_val($fx.bcx.ins().bint(types::I8, b), ret_layout)
815 (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, custom(|| $body:expr)) => {{
818 (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, $name:ident) => {{
819 let ret_layout = $fx.layout_of($ret_ty);
820 CValue::by_val($fx.bcx.ins().$name($lhs, $rhs), ret_layout)
823 $fx:expr, $bin_op:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, $bug_fmt:expr;
825 $var:ident ($sign:pat) $name:tt $( ( $($next:tt)* ) )? ;
828 let lhs = $lhs.load_scalar($fx);
829 let rhs = $rhs.load_scalar($fx);
830 match ($bin_op, $signed) {
832 (BinOp::$var, $sign) => binop_match!(@single $fx, $bug_fmt, $var, $signed, lhs, rhs, $ret_ty, $name $( ( $($next)* ) )?),
838 fn trans_bool_binop<'a, 'tcx: 'a>(
839 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
845 let res = binop_match! {
846 fx, bin_op, false, lhs, rhs, ty, "bool";
859 Lt (_) icmp(UnsignedLessThan);
860 Le (_) icmp(UnsignedLessThanOrEqual);
861 Ne (_) icmp(NotEqual);
862 Ge (_) icmp(UnsignedGreaterThanOrEqual);
863 Gt (_) icmp(UnsignedGreaterThan);
871 pub fn trans_int_binop<'a, 'tcx: 'a>(
872 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
879 if bin_op != BinOp::Shl && bin_op != BinOp::Shr {
883 "int binop requires lhs and rhs of same type"
887 fx, bin_op, signed, lhs, rhs, out_ty, "int/uint";
903 Lt (false) icmp(UnsignedLessThan);
904 Lt (true) icmp(SignedLessThan);
905 Le (false) icmp(UnsignedLessThanOrEqual);
906 Le (true) icmp(SignedLessThanOrEqual);
907 Ne (_) icmp(NotEqual);
908 Ge (false) icmp(UnsignedGreaterThanOrEqual);
909 Ge (true) icmp(SignedGreaterThanOrEqual);
910 Gt (false) icmp(UnsignedGreaterThan);
911 Gt (true) icmp(SignedGreaterThan);
917 pub fn trans_checked_int_binop<'a, 'tcx: 'a>(
918 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
920 in_lhs: CValue<'tcx>,
921 in_rhs: CValue<'tcx>,
925 if bin_op != BinOp::Shl && bin_op != BinOp::Shr {
929 "checked int binop requires lhs and rhs of same type"
933 let lhs = in_lhs.load_scalar(fx);
934 let rhs = in_rhs.load_scalar(fx);
935 let res = match bin_op {
936 BinOp::Add => fx.bcx.ins().iadd(lhs, rhs),
937 BinOp::Sub => fx.bcx.ins().isub(lhs, rhs),
938 BinOp::Mul => fx.bcx.ins().imul(lhs, rhs),
939 BinOp::Shl => fx.bcx.ins().ishl(lhs, rhs),
942 fx.bcx.ins().ushr(lhs, rhs)
944 fx.bcx.ins().sshr(lhs, rhs)
948 "binop {:?} on checked int/uint lhs: {:?} rhs: {:?}",
955 // TODO: check for overflow
956 let has_overflow = fx.bcx.ins().iconst(types::I8, 0);
958 let out_place = CPlace::new_stack_slot(fx, out_ty);
959 let out_layout = out_place.layout();
960 out_place.write_cvalue(fx, CValue::by_val_pair(res, has_overflow, out_layout));
962 out_place.to_cvalue(fx)
965 fn trans_float_binop<'a, 'tcx: 'a>(
966 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
972 let res = binop_match! {
973 fx, bin_op, false, lhs, rhs, ty, "float";
979 assert_eq!(lhs.layout().ty, ty);
980 assert_eq!(rhs.layout().ty, ty);
982 ty::Float(FloatTy::F32) => fx.easy_call("fmodf", &[lhs, rhs], ty),
983 ty::Float(FloatTy::F64) => fx.easy_call("fmod", &[lhs, rhs], ty),
994 Lt (_) fcmp(LessThan);
995 Le (_) fcmp(LessThanOrEqual);
996 Ne (_) fcmp(NotEqual);
997 Ge (_) fcmp(GreaterThanOrEqual);
998 Gt (_) fcmp(GreaterThan);
1006 fn trans_char_binop<'a, 'tcx: 'a>(
1007 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1013 let res = binop_match! {
1014 fx, bin_op, false, lhs, rhs, ty, "char";
1027 Lt (_) icmp(UnsignedLessThan);
1028 Le (_) icmp(UnsignedLessThanOrEqual);
1029 Ne (_) icmp(NotEqual);
1030 Ge (_) icmp(UnsignedGreaterThanOrEqual);
1031 Gt (_) icmp(UnsignedGreaterThan);
1039 fn trans_ptr_binop<'a, 'tcx: 'a>(
1040 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1046 let not_fat = match lhs.layout().ty.sty {
1047 ty::RawPtr(TypeAndMut { ty, mutbl: _ }) => {
1048 ty.is_sized(fx.tcx.at(DUMMY_SP), ParamEnv::reveal_all())
1050 ty::FnPtr(..) => true,
1051 _ => bug!("trans_ptr_binop on non ptr"),
1054 if let BinOp::Offset = bin_op {
1055 let (base, offset) = (lhs, rhs.load_scalar(fx));
1056 let pointee_ty = base.layout().ty.builtin_deref(true).unwrap().ty;
1057 let pointee_size = fx.layout_of(pointee_ty).size.bytes();
1058 let ptr_diff = fx.bcx.ins().imul_imm(offset, pointee_size as i64);
1059 let base_val = base.load_scalar(fx);
1060 let res = fx.bcx.ins().iadd(base_val, ptr_diff);
1061 return CValue::by_val(res, base.layout());
1065 fx, bin_op, false, lhs, rhs, ret_ty, "ptr";
1078 Lt (_) icmp(UnsignedLessThan);
1079 Le (_) icmp(UnsignedLessThanOrEqual);
1080 Ne (_) icmp(NotEqual);
1081 Ge (_) icmp(UnsignedGreaterThanOrEqual);
1082 Gt (_) icmp(UnsignedGreaterThan);
1084 Offset (_) bug; // Handled above
1087 let (lhs_ptr, lhs_extra) = lhs.load_scalar_pair(fx);
1088 let (rhs_ptr, rhs_extra) = rhs.load_scalar_pair(fx);
1089 let res = match bin_op {
1091 let ptr_eq = fx.bcx.ins().icmp(IntCC::Equal, lhs_ptr, rhs_ptr);
1092 let extra_eq = fx.bcx.ins().icmp(IntCC::Equal, lhs_extra, rhs_extra);
1093 fx.bcx.ins().band(ptr_eq, extra_eq)
1096 let ptr_ne = fx.bcx.ins().icmp(IntCC::NotEqual, lhs_ptr, rhs_ptr);
1097 let extra_ne = fx.bcx.ins().icmp(IntCC::NotEqual, lhs_extra, rhs_extra);
1098 fx.bcx.ins().bor(ptr_ne, extra_ne)
1100 _ => unimplemented!(
1101 "trans_ptr_binop({:?}, <fat ptr>, <fat ptr>) not implemented",
1106 assert_eq!(fx.tcx.types.bool, ret_ty);
1107 let ret_layout = fx.layout_of(ret_ty);
1108 CValue::by_val(fx.bcx.ins().bint(types::I8, res), ret_layout)
1112 pub fn trans_place<'a, 'tcx: 'a>(
1113 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1114 place: &Place<'tcx>,
1117 Place::Base(base) => match base {
1118 PlaceBase::Local(local) => fx.get_local_place(*local),
1119 PlaceBase::Static(static_) => match static_.kind {
1120 StaticKind::Static(def_id) => {
1121 crate::constant::codegen_static_ref(fx, def_id, static_.ty)
1123 StaticKind::Promoted(promoted) => {
1124 crate::constant::trans_promoted(fx, promoted, static_.ty)
1128 Place::Projection(projection) => {
1129 let base = trans_place(fx, &projection.base);
1130 match projection.elem {
1131 ProjectionElem::Deref => base.place_deref(fx),
1132 ProjectionElem::Field(field, _ty) => base.place_field(fx, field),
1133 ProjectionElem::Index(local) => {
1134 let index = fx.get_local_place(local).to_cvalue(fx).load_scalar(fx);
1135 base.place_index(fx, index)
1137 ProjectionElem::ConstantIndex {
1142 let index = if !from_end {
1143 fx.bcx.ins().iconst(fx.pointer_type, offset as i64)
1145 let len = codegen_array_len(fx, base);
1146 fx.bcx.ins().iadd_imm(len, -(offset as i64))
1148 base.place_index(fx, index)
1150 ProjectionElem::Subslice { from, to } => {
1151 // These indices are generated by slice patterns.
1152 // slice[from:-to] in Python terms.
1154 match base.layout().ty.sty {
1155 ty::Array(elem_ty, len) => {
1156 let elem_layout = fx.layout_of(elem_ty);
1157 let ptr = base.to_addr(fx);
1158 let len = crate::constant::force_eval_const(fx, len).unwrap_usize(fx.tcx);
1160 fx.bcx.ins().iadd_imm(ptr, elem_layout.size.bytes() as i64 * from as i64),
1161 fx.layout_of(fx.tcx.mk_array(elem_ty, len - from as u64 - to as u64)),
1164 ty::Slice(elem_ty) => {
1165 let elem_layout = fx.layout_of(elem_ty);
1166 let (ptr, len) = base.to_addr_maybe_unsized(fx);
1167 let len = len.unwrap();
1168 CPlace::for_addr_with_extra(
1169 fx.bcx.ins().iadd_imm(ptr, elem_layout.size.bytes() as i64 * from as i64),
1170 fx.bcx.ins().iadd_imm(len, -(from as i64 + to as i64)),
1174 _ => unreachable!(),
1177 ProjectionElem::Downcast(_adt_def, variant) => base.downcast_variant(fx, variant),
1183 pub fn trans_operand<'a, 'tcx>(
1184 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1185 operand: &Operand<'tcx>,
1188 Operand::Move(place) | Operand::Copy(place) => {
1189 let cplace = trans_place(fx, place);
1190 cplace.to_cvalue(fx)
1192 Operand::Constant(const_) => crate::constant::trans_constant(fx, const_),