5 use rustc_target::spec::abi::Abi;
9 #[derive(Copy, Clone, Debug)]
17 fn get_param_ty(self, fx: &FunctionCx<impl Backend>) -> Type {
19 PassMode::NoPass => unimplemented!("pass mode nopass"),
20 PassMode::ByVal(clif_type) => clif_type,
21 PassMode::ByRef => fx.pointer_type,
26 fn get_pass_mode<'a, 'tcx: 'a>(
27 tcx: TyCtxt<'a, 'tcx, 'tcx>,
33 .layout_of(ParamEnv::reveal_all().and(ty))
36 if let ty::Never = ty.sty {
42 } else if ty.sty == tcx.mk_unit().sty {
48 } else if let Some(ret_ty) = crate::common::clif_type_from_ty(tcx, ty) {
49 PassMode::ByVal(ret_ty)
53 "Non scalars are not yet supported for \"C\" abi ({:?}) is_return: {:?}",
62 fn adjust_arg_for_abi<'a, 'tcx: 'a>(
63 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
67 match get_pass_mode(fx.tcx, sig.abi, arg.layout().ty, false) {
68 PassMode::NoPass => unimplemented!("pass mode nopass"),
69 PassMode::ByVal(_) => arg.load_value(fx),
70 PassMode::ByRef => arg.force_stack(fx),
74 fn clif_sig_from_fn_ty<'a, 'tcx: 'a>(
75 tcx: TyCtxt<'a, 'tcx, 'tcx>,
78 let sig = ty_fn_sig(tcx, fn_ty);
80 unimpl!("Variadic function are not yet supported");
82 let (call_conv, inputs, output): (CallConv, Vec<Ty>, Ty) = match sig.abi {
83 Abi::Rust => (CallConv::SystemV, sig.inputs().to_vec(), sig.output()),
84 Abi::C => (CallConv::SystemV, sig.inputs().to_vec(), sig.output()),
86 assert_eq!(sig.inputs().len(), 2);
87 let extra_args = match sig.inputs().last().unwrap().sty {
88 ty::Tuple(ref tupled_arguments) => tupled_arguments,
89 _ => bug!("argument to function with \"rust-call\" ABI is not a tuple"),
91 let mut inputs: Vec<Ty> = vec![sig.inputs()[0]];
92 inputs.extend(extra_args.into_iter());
93 (CallConv::SystemV, inputs, sig.output())
95 Abi::System => bug!("system abi should be selected elsewhere"),
96 Abi::RustIntrinsic => (CallConv::SystemV, sig.inputs().to_vec(), sig.output()),
97 _ => unimplemented!("unsupported abi {:?}", sig.abi),
102 .filter_map(|ty| match get_pass_mode(tcx, sig.abi, ty, false) {
103 PassMode::ByVal(clif_ty) => Some(clif_ty),
104 PassMode::NoPass => unimplemented!("pass mode nopass"),
105 PassMode::ByRef => Some(pointer_ty(tcx)),
108 let (params, returns) = match get_pass_mode(tcx, sig.abi, output, true) {
109 PassMode::NoPass => (inputs.map(AbiParam::new).collect(), vec![]),
110 PassMode::ByVal(ret_ty) => (
111 inputs.map(AbiParam::new).collect(),
112 vec![AbiParam::new(ret_ty)],
116 Some(pointer_ty(tcx)) // First param is place to put return val
133 pub fn ty_fn_sig<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, ty: Ty<'tcx>) -> ty::FnSig<'tcx> {
134 let sig = match ty.sty {
136 // Shims currently have type TyFnPtr. Not sure this should remain.
137 ty::FnPtr(_) => ty.fn_sig(tcx),
138 ty::Closure(def_id, substs) => {
139 let sig = substs.closure_sig(def_id, tcx);
141 let env_ty = tcx.closure_env_ty(def_id, substs).unwrap();
142 sig.map_bound(|sig| tcx.mk_fn_sig(
143 iter::once(*env_ty.skip_binder()).chain(sig.inputs().iter().cloned()),
150 ty::Generator(def_id, substs, _) => {
151 let sig = substs.poly_sig(def_id, tcx);
153 let env_region = ty::ReLateBound(ty::INNERMOST, ty::BrEnv);
154 let env_ty = tcx.mk_mut_ref(tcx.mk_region(env_region), ty);
156 sig.map_bound(|sig| {
157 let state_did = tcx.lang_items().gen_state().unwrap();
158 let state_adt_ref = tcx.adt_def(state_did);
159 let state_substs = tcx.intern_substs(&[
161 sig.return_ty.into(),
163 let ret_ty = tcx.mk_adt(state_adt_ref, state_substs);
165 tcx.mk_fn_sig(iter::once(env_ty),
168 hir::Unsafety::Normal,
173 _ => bug!("unexpected type {:?} to ty_fn_sig", ty)
175 tcx.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), &sig)
178 pub fn get_function_name_and_sig<'a, 'tcx>(
179 tcx: TyCtxt<'a, 'tcx, 'tcx>,
180 inst: Instance<'tcx>,
181 ) -> (String, Signature) {
182 assert!(!inst.substs.needs_infer() && !inst.substs.has_param_types());
183 let fn_ty = inst.ty(tcx);
184 let sig = clif_sig_from_fn_ty(tcx, fn_ty);
185 (tcx.symbol_name(inst).as_str().to_string(), sig)
188 impl<'a, 'tcx: 'a, B: Backend + 'a> FunctionCx<'a, 'tcx, B> {
189 /// Instance must be monomorphized
190 pub fn get_function_id(&mut self, inst: Instance<'tcx>) -> FuncId {
191 let (name, sig) = get_function_name_and_sig(self.tcx, inst);
193 .declare_function(&name, Linkage::Import, &sig)
197 /// Instance must be monomorphized
198 pub fn get_function_ref(&mut self, inst: Instance<'tcx>) -> FuncRef {
199 let func_id = self.get_function_id(inst);
200 let func_ref = self.module
201 .declare_func_in_func(func_id, &mut self.bcx.func);
202 self.add_entity_comment(func_ref, format!("{:?}", inst));
209 input_tys: Vec<types::Type>,
210 output_ty: Option<types::Type>,
213 let sig = Signature {
214 params: input_tys.iter().cloned().map(AbiParam::new).collect(),
216 .map(|output_ty| vec![AbiParam::new(output_ty)])
217 .unwrap_or(Vec::new()),
218 call_conv: CallConv::SystemV,
222 .declare_function(&name, Linkage::Import, &sig)
226 .declare_func_in_func(func_id, &mut self.bcx.func);
227 let call_inst = self.bcx.ins().call(func_ref, args);
228 if output_ty.is_none() {
231 let results = self.bcx.inst_results(call_inst);
232 assert_eq!(results.len(), 1);
239 args: &[CValue<'tcx>],
242 let (input_tys, args): (Vec<_>, Vec<_>) = args
246 self.clif_type(arg.layout().ty).unwrap(),
247 arg.load_value(self),
251 let return_layout = self.layout_of(return_ty);
252 let return_ty = if let ty::Tuple(tup) = return_ty.sty {
254 bug!("easy_call( (...) -> <non empty tuple> ) is not allowed");
258 Some(self.clif_type(return_ty).unwrap())
260 if let Some(val) = self.lib_call(name, input_tys, return_ty, &args) {
261 CValue::ByVal(val, return_layout)
263 CValue::ByRef(self.bcx.ins().iconst(self.pointer_type, 0), return_layout)
267 fn self_sig(&self) -> FnSig<'tcx> {
268 ty_fn_sig(self.tcx, self.instance.ty(self.tcx))
271 fn return_type(&self) -> Ty<'tcx> {
272 self.self_sig().output()
276 fn add_arg_comment<'a, 'tcx: 'a>(
277 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
280 local_field: Option<usize>,
281 param: Option<Value>,
283 ssa: crate::analyze::Flags,
286 let local_field = if let Some(local_field) = local_field {
287 Cow::Owned(format!(".{}", local_field))
291 let param = if let Some(param) = param {
292 Cow::Owned(format!("= {:?}", param))
296 let pass_mode = format!("{:?}", pass_mode);
297 fx.add_global_comment(format!(
298 "{msg:5} {local:>3}{local_field:<5} {param:10} {pass_mode:20} {ssa:10} {ty:?}",
299 msg=msg, local=format!("{:?}", local), local_field=local_field, param=param, pass_mode=pass_mode, ssa=format!("{:?}", ssa), ty=ty,
303 fn add_local_header_comment(fx: &mut FunctionCx<impl Backend>) {
304 fx.add_global_comment(format!("msg loc.idx param pass mode ssa flags ty"));
307 fn local_place<'a, 'tcx: 'a>(
308 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
310 layout: TyLayout<'tcx>,
313 let place = if is_ssa {
314 fx.bcx.declare_var(mir_var(local), fx.clif_type(layout.ty).unwrap());
315 CPlace::Var(local, layout)
317 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
318 kind: StackSlotKind::ExplicitSlot,
319 size: layout.size.bytes() as u32,
323 let TyLayout { ty, details } = layout;
324 let ty::layout::LayoutDetails { size, align, abi: _, variants: _, fields: _ } = details;
325 fx.add_entity_comment(stack_slot, format!(
326 "{:?}: {:?} size={} align={},{}",
327 local, ty, size.bytes(), align.abi.bytes(), align.pref.bytes(),
330 CPlace::from_stack_slot(fx, stack_slot, layout.ty)
333 let prev_place = fx.local_map.insert(local, place);
334 debug_assert!(prev_place.is_none());
338 fn cvalue_for_param<'a, 'tcx: 'a>(
339 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
342 local_field: Option<usize>,
344 ssa_flags: crate::analyze::Flags,
346 let layout = fx.layout_of(arg_ty);
347 let pass_mode = get_pass_mode(fx.tcx, fx.self_sig().abi, arg_ty, false);
348 let clif_type = pass_mode.get_param_ty(fx);
349 let ebb_param = fx.bcx.append_ebb_param(start_ebb, clif_type);
350 add_arg_comment(fx, "arg", local, local_field, Some(ebb_param), pass_mode, ssa_flags, arg_ty);
352 PassMode::NoPass => unimplemented!("pass mode nopass"),
353 PassMode::ByVal(_) => CValue::ByVal(ebb_param, layout),
354 PassMode::ByRef => CValue::ByRef(ebb_param, layout),
358 pub fn codegen_fn_prelude<'a, 'tcx: 'a>(
359 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
362 let ssa_analyzed = crate::analyze::analyze(fx);
363 fx.add_global_comment(format!("ssa {:?}", ssa_analyzed));
365 let ret_layout = fx.layout_of(fx.return_type());
366 let output_pass_mode = get_pass_mode(fx.tcx, fx.self_sig().abi, fx.return_type(), true);
367 let ret_param = match output_pass_mode {
368 PassMode::NoPass => None,
369 PassMode::ByVal(_) => None,
370 PassMode::ByRef => Some(fx.bcx.append_ebb_param(start_ebb, fx.pointer_type)),
373 add_local_header_comment(fx);
374 add_arg_comment(fx, "ret", RETURN_PLACE, None, ret_param, output_pass_mode, ssa_analyzed[&RETURN_PLACE], ret_layout.ty);
377 Normal(CValue<'tcx>),
378 Spread(Vec<CValue<'tcx>>),
385 let arg_ty = fx.monomorphize(&fx.mir.local_decls[local].ty);
387 // Adapted from https://github.com/rust-lang/rust/blob/145155dc96757002c7b2e9de8489416e2fdbbd57/src/librustc_codegen_llvm/mir/mod.rs#L442-L482
388 if Some(local) == fx.mir.spread_arg {
389 // This argument (e.g. the last argument in the "rust-call" ABI)
390 // is a tuple that was spread at the ABI level and now we have
391 // to reconstruct it into a tuple local variable, from multiple
392 // individual function arguments.
394 let tupled_arg_tys = match arg_ty.sty {
395 ty::Tuple(ref tys) => tys,
396 _ => bug!("spread argument isn't a tuple?! but {:?}", arg_ty),
399 let mut params = Vec::new();
400 for (i, arg_ty) in tupled_arg_tys.iter().enumerate() {
401 let param = cvalue_for_param(fx, start_ebb, local, Some(i), arg_ty, ssa_analyzed[&local]);
405 (local, ArgKind::Spread(params), arg_ty)
407 let param = cvalue_for_param(fx, start_ebb, local, None, arg_ty, ssa_analyzed[&local]);
410 ArgKind::Normal(param),
415 .collect::<Vec<(Local, ArgKind, Ty)>>();
417 fx.bcx.switch_to_block(start_ebb);
419 match output_pass_mode {
420 PassMode::NoPass => {
421 let null = fx.bcx.ins().iconst(fx.pointer_type, 0);
424 CPlace::Addr(null, None, fx.layout_of(fx.return_type())),
427 PassMode::ByVal(ret_ty) => {
428 fx.bcx.declare_var(mir_var(RETURN_PLACE), ret_ty);
430 .insert(RETURN_PLACE, CPlace::Var(RETURN_PLACE, ret_layout));
435 CPlace::Addr(ret_param.unwrap(), None, ret_layout),
440 for (local, arg_kind, ty) in func_params {
441 let layout = fx.layout_of(ty);
443 let is_ssa = !ssa_analyzed
446 .contains(crate::analyze::Flags::NOT_SSA);
448 let place = local_place(fx, local, layout, is_ssa);
451 ArgKind::Normal(param) => {
452 place.write_cvalue(fx, param);
454 ArgKind::Spread(params) => {
455 for (i, param) in params.into_iter().enumerate() {
456 place.place_field(fx, mir::Field::new(i)).write_cvalue(fx, param);
462 for local in fx.mir.vars_and_temps_iter() {
463 let ty = fx.mir.local_decls[local].ty;
464 let layout = fx.layout_of(ty);
466 let is_ssa = !ssa_analyzed
469 .contains(crate::analyze::Flags::NOT_SSA);
471 local_place(fx, local, layout, is_ssa);
476 .jump(*fx.ebb_map.get(&START_BLOCK).unwrap(), &[]);
479 pub fn codegen_terminator_call<'a, 'tcx: 'a>(
480 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
481 func: &Operand<'tcx>,
482 args: &[Operand<'tcx>],
483 destination: &Option<(Place<'tcx>, BasicBlock)>,
485 let fn_ty = fx.monomorphize(&func.ty(fx.mir, fx.tcx));
486 let sig = ty_fn_sig(fx.tcx, fn_ty);
488 // Unpack arguments tuple for closures
489 let args = if sig.abi == Abi::RustCall {
490 assert_eq!(args.len(), 2, "rust-call abi requires two arguments");
491 let self_arg = trans_operand(fx, &args[0]);
492 let pack_arg = trans_operand(fx, &args[1]);
493 let mut args = Vec::new();
495 match pack_arg.layout().ty.sty {
496 ty::Tuple(ref tupled_arguments) => {
497 for (i, _) in tupled_arguments.iter().enumerate() {
498 args.push(pack_arg.value_field(fx, mir::Field::new(i)));
501 _ => bug!("argument to function with \"rust-call\" ABI is not a tuple"),
506 .map(|arg| trans_operand(fx, arg))
510 let destination = destination
512 .map(|&(ref place, bb)| (trans_place(fx, place), bb));
514 if let ty::FnDef(def_id, substs) = fn_ty.sty {
515 let instance = ty::Instance::resolve(
517 ty::ParamEnv::reveal_all(),
523 InstanceDef::Intrinsic(_) => {
524 crate::intrinsics::codegen_intrinsic_call(fx, def_id, substs, args, destination);
527 InstanceDef::DropGlue(_, None) => {
528 // empty drop glue - a nop.
529 let (_, dest) = destination.expect("Non terminating drop_in_place_real???");
530 let ret_ebb = fx.get_ebb(dest);
531 fx.bcx.ins().jump(ret_ebb, &[]);
543 destination.map(|(place, _)| place),
546 if let Some((_, dest)) = destination {
547 let ret_ebb = fx.get_ebb(dest);
548 fx.bcx.ins().jump(ret_ebb, &[]);
550 trap_unreachable(&mut fx.bcx);
554 pub fn codegen_call_inner<'a, 'tcx: 'a>(
555 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
556 func: Option<&Operand<'tcx>>,
558 args: Vec<CValue<'tcx>>,
559 ret_place: Option<CPlace<'tcx>>,
561 let sig = ty_fn_sig(fx.tcx, fn_ty);
563 let ret_layout = fx.layout_of(sig.output());
565 let output_pass_mode = get_pass_mode(fx.tcx, sig.abi, sig.output(), true);
566 let return_ptr = match output_pass_mode {
567 PassMode::NoPass => None,
568 PassMode::ByRef => match ret_place {
569 Some(ret_place) => Some(ret_place.expect_addr()),
570 None => Some(fx.bcx.ins().iconst(fx.pointer_type, 0)),
572 PassMode::ByVal(_) => None,
575 let instance = match fn_ty.sty {
576 ty::FnDef(def_id, substs) => {
577 Some(Instance::resolve(fx.tcx, ParamEnv::reveal_all(), def_id, substs).unwrap())
582 let func_ref: Option<Value>; // Indirect call target
585 if let Some(Instance {
586 def: InstanceDef::Virtual(_, idx),
590 let (ptr, method) = crate::vtable::get_ptr_and_method_ref(fx, args[0], idx);
591 func_ref = Some(method);
594 func_ref = if instance.is_none() {
595 let func = trans_operand(fx, func.expect("indirect call without func Operand"));
596 Some(func.load_value(fx))
601 args.get(0).map(|arg| adjust_arg_for_abi(fx, sig, *arg))
606 let call_args: Vec<Value> = return_ptr
612 .map(|arg| adjust_arg_for_abi(fx, sig, arg)),
614 .collect::<Vec<_>>();
616 let sig = fx.bcx.import_signature(clif_sig_from_fn_ty(fx.tcx, fn_ty));
617 let call_inst = if let Some(func_ref) = func_ref {
618 fx.bcx.ins().call_indirect(sig, func_ref, &call_args)
620 let func_ref = fx.get_function_ref(instance.expect("non-indirect call on non-FnDef type"));
621 fx.bcx.ins().call(func_ref, &call_args)
624 match output_pass_mode {
625 PassMode::NoPass => {}
626 PassMode::ByVal(_) => {
627 if let Some(ret_place) = ret_place {
628 let results = fx.bcx.inst_results(call_inst);
629 ret_place.write_cvalue(fx, CValue::ByVal(results[0], ret_layout));
632 PassMode::ByRef => {}
636 pub fn codegen_return(fx: &mut FunctionCx<impl Backend>) {
637 match get_pass_mode(fx.tcx, fx.self_sig().abi, fx.return_type(), true) {
638 PassMode::NoPass | PassMode::ByRef => {
639 fx.bcx.ins().return_(&[]);
641 PassMode::ByVal(_) => {
642 let place = fx.get_local_place(RETURN_PLACE);
643 let ret_val = place.to_cvalue(fx).load_value(fx);
644 fx.bcx.ins().return_(&[ret_val]);