4 use rustc_target::spec::abi::Abi;
16 fn get_param_ty(self, fx: &FunctionCx<impl Backend>) -> Type {
18 PassMode::NoPass => unimplemented!("pass mode nopass"),
19 PassMode::ByVal(clif_type) => clif_type,
20 PassMode::ByRef => fx.pointer_type,
25 fn get_pass_mode<'a, 'tcx: 'a>(
26 tcx: TyCtxt<'a, 'tcx, 'tcx>,
32 .layout_of(ParamEnv::reveal_all().and(ty))
35 if let ty::Never = ty.sty {
41 } else if ty.sty == tcx.mk_unit().sty {
47 } else if let Some(ret_ty) = crate::common::clif_type_from_ty(tcx, ty) {
48 PassMode::ByVal(ret_ty)
52 "Non scalars are not yet supported for \"C\" abi ({:?}) is_return: {:?}",
61 fn adjust_arg_for_abi<'a, 'tcx: 'a>(
62 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
66 match get_pass_mode(fx.tcx, sig.abi, arg.layout().ty, false) {
67 PassMode::NoPass => unimplemented!("pass mode nopass"),
68 PassMode::ByVal(_) => arg.load_value(fx),
69 PassMode::ByRef => arg.force_stack(fx),
73 pub fn clif_sig_from_fn_ty<'a, 'tcx: 'a>(
74 tcx: TyCtxt<'a, 'tcx, 'tcx>,
77 let sig = ty_fn_sig(tcx, fn_ty);
79 unimpl!("Variadic function are not yet supported");
81 let (call_conv, inputs, output): (CallConv, Vec<Ty>, Ty) = match sig.abi {
82 Abi::Rust => (CallConv::Fast, sig.inputs().to_vec(), sig.output()),
83 Abi::C => (CallConv::SystemV, sig.inputs().to_vec(), sig.output()),
85 assert_eq!(sig.inputs().len(), 2);
86 let extra_args = match sig.inputs().last().unwrap().sty {
87 ty::Tuple(ref tupled_arguments) => tupled_arguments,
88 _ => bug!("argument to function with \"rust-call\" ABI is not a tuple"),
90 let mut inputs: Vec<Ty> = vec![sig.inputs()[0]];
91 inputs.extend(extra_args.into_iter());
92 (CallConv::Fast, inputs, sig.output())
94 Abi::System => bug!("system abi should be selected elsewhere"),
95 Abi::RustIntrinsic => (CallConv::SystemV, sig.inputs().to_vec(), sig.output()),
96 _ => unimplemented!("unsupported abi {:?}", sig.abi),
101 .filter_map(|ty| match get_pass_mode(tcx, sig.abi, ty, false) {
102 PassMode::ByVal(clif_ty) => Some(clif_ty),
103 PassMode::NoPass => unimplemented!("pass mode nopass"),
104 PassMode::ByRef => Some(pointer_ty(tcx)),
107 let (params, returns) = match get_pass_mode(tcx, sig.abi, output, true) {
108 PassMode::NoPass => (inputs.map(AbiParam::new).collect(), vec![]),
109 PassMode::ByVal(ret_ty) => (
110 inputs.map(AbiParam::new).collect(),
111 vec![AbiParam::new(ret_ty)],
115 Some(pointer_ty(tcx)) // First param is place to put return val
132 fn ty_fn_sig<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, ty: Ty<'tcx>) -> ty::FnSig<'tcx> {
133 let sig = match ty.sty {
135 // Shims currently have type TyFnPtr. Not sure this should remain.
136 ty::FnPtr(_) => ty.fn_sig(tcx),
137 ty::Closure(def_id, substs) => {
138 let sig = substs.closure_sig(def_id, tcx);
140 let env_ty = tcx.closure_env_ty(def_id, substs).unwrap();
141 sig.map_bound(|sig| tcx.mk_fn_sig(
142 iter::once(*env_ty.skip_binder()).chain(sig.inputs().iter().cloned()),
149 ty::Generator(def_id, substs, _) => {
150 let sig = substs.poly_sig(def_id, tcx);
152 let env_region = ty::ReLateBound(ty::INNERMOST, ty::BrEnv);
153 let env_ty = tcx.mk_mut_ref(tcx.mk_region(env_region), ty);
155 sig.map_bound(|sig| {
156 let state_did = tcx.lang_items().gen_state().unwrap();
157 let state_adt_ref = tcx.adt_def(state_did);
158 let state_substs = tcx.intern_substs(&[
160 sig.return_ty.into(),
162 let ret_ty = tcx.mk_adt(state_adt_ref, state_substs);
164 tcx.mk_fn_sig(iter::once(env_ty),
167 hir::Unsafety::Normal,
172 _ => bug!("unexpected type {:?} to ty_fn_sig", ty)
174 tcx.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), &sig)
177 pub fn get_function_name_and_sig<'a, 'tcx>(
178 tcx: TyCtxt<'a, 'tcx, 'tcx>,
179 inst: Instance<'tcx>,
180 ) -> (String, Signature) {
181 assert!(!inst.substs.needs_infer() && !inst.substs.has_param_types());
182 let fn_ty = inst.ty(tcx);
183 let sig = clif_sig_from_fn_ty(tcx, fn_ty);
184 (tcx.symbol_name(inst).as_str().to_string(), sig)
187 impl<'a, 'tcx: 'a, B: Backend + 'a> FunctionCx<'a, 'tcx, B> {
188 /// Instance must be monomorphized
189 pub fn get_function_id(&mut self, inst: Instance<'tcx>) -> FuncId {
190 let (name, sig) = get_function_name_and_sig(self.tcx, inst);
192 .declare_function(&name, Linkage::Import, &sig)
196 /// Instance must be monomorphized
197 pub fn get_function_ref(&mut self, inst: Instance<'tcx>) -> FuncRef {
198 let func_id = self.get_function_id(inst);
200 .declare_func_in_func(func_id, &mut self.bcx.func)
206 input_tys: Vec<types::Type>,
207 output_ty: Option<types::Type>,
210 let sig = Signature {
211 params: input_tys.iter().cloned().map(AbiParam::new).collect(),
213 .map(|output_ty| vec![AbiParam::new(output_ty)])
214 .unwrap_or(Vec::new()),
215 call_conv: CallConv::SystemV,
219 .declare_function(&name, Linkage::Import, &sig)
223 .declare_func_in_func(func_id, &mut self.bcx.func);
224 let call_inst = self.bcx.ins().call(func_ref, args);
225 if output_ty.is_none() {
228 let results = self.bcx.inst_results(call_inst);
229 assert_eq!(results.len(), 1);
236 args: &[CValue<'tcx>],
239 let (input_tys, args): (Vec<_>, Vec<_>) = args
243 self.clif_type(arg.layout().ty).unwrap(),
244 arg.load_value(self),
248 let return_layout = self.layout_of(return_ty);
249 let return_ty = if let ty::Tuple(tup) = return_ty.sty {
251 bug!("easy_call( (...) -> <non empty tuple> ) is not allowed");
255 Some(self.clif_type(return_ty).unwrap())
257 if let Some(val) = self.lib_call(name, input_tys, return_ty, &args) {
258 CValue::ByVal(val, return_layout)
260 CValue::ByRef(self.bcx.ins().iconst(self.pointer_type, 0), return_layout)
264 fn self_sig(&self) -> FnSig<'tcx> {
265 ty_fn_sig(self.tcx, self.instance.ty(self.tcx))
268 fn return_type(&self) -> Ty<'tcx> {
269 self.self_sig().output()
273 pub fn codegen_fn_prelude<'a, 'tcx: 'a>(
274 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
277 let ssa_analyzed = crate::analyze::analyze(fx);
279 let ret_layout = fx.layout_of(fx.return_type());
280 let output_pass_mode = get_pass_mode(fx.tcx, fx.self_sig().abi, fx.return_type(), true);
281 let ret_param = match output_pass_mode {
282 PassMode::NoPass => None,
283 PassMode::ByVal(_) => None,
284 PassMode::ByRef => Some(fx.bcx.append_ebb_param(start_ebb, fx.pointer_type)),
296 let arg_ty = fx.monomorphize(&fx.mir.local_decls[local].ty);
298 // Adapted from https://github.com/rust-lang/rust/blob/145155dc96757002c7b2e9de8489416e2fdbbd57/src/librustc_codegen_llvm/mir/mod.rs#L442-L482
299 if Some(local) == fx.mir.spread_arg {
300 // This argument (e.g. the last argument in the "rust-call" ABI)
301 // is a tuple that was spread at the ABI level and now we have
302 // to reconstruct it into a tuple local variable, from multiple
303 // individual function arguments.
305 let tupled_arg_tys = match arg_ty.sty {
306 ty::Tuple(ref tys) => tys,
307 _ => bug!("spread argument isn't a tuple?! but {:?}", arg_ty),
310 let mut ebb_params = Vec::new();
311 for arg_ty in tupled_arg_tys.iter() {
313 get_pass_mode(fx.tcx, fx.self_sig().abi, arg_ty, false).get_param_ty(fx);
314 ebb_params.push(fx.bcx.append_ebb_param(start_ebb, clif_type));
317 (local, ArgKind::Spread(ebb_params), arg_ty)
320 get_pass_mode(fx.tcx, fx.self_sig().abi, arg_ty, false).get_param_ty(fx);
323 ArgKind::Normal(fx.bcx.append_ebb_param(start_ebb, clif_type)),
328 .collect::<Vec<(Local, ArgKind, Ty)>>();
330 fx.bcx.switch_to_block(start_ebb);
332 fx.top_nop = Some(fx.bcx.ins().nop());
333 fx.add_global_comment(format!("ssa {:?}", ssa_analyzed));
335 for local in fx.mir.args_iter() {
336 let arg_ty = fx.monomorphize(&fx.mir.local_decls[local].ty);
337 let pass_mode = get_pass_mode(fx.tcx, fx.self_sig().abi, arg_ty, false);
338 fx.add_global_comment(format!("pass {:?}: {:?} {:?}", local, arg_ty, pass_mode));
341 match output_pass_mode {
342 PassMode::NoPass => {
343 let null = fx.bcx.ins().iconst(fx.pointer_type, 0);
344 //unimplemented!("pass mode nopass");
347 CPlace::Addr(null, None, fx.layout_of(fx.return_type())),
350 PassMode::ByVal(ret_ty) => {
351 fx.bcx.declare_var(mir_var(RETURN_PLACE), ret_ty);
353 .insert(RETURN_PLACE, CPlace::Var(RETURN_PLACE, ret_layout));
358 CPlace::Addr(ret_param.unwrap(), None, ret_layout),
363 for (local, arg_kind, ty) in func_params {
364 let layout = fx.layout_of(ty);
366 if let ArgKind::Normal(ebb_param) = arg_kind {
370 .contains(crate::analyze::Flags::NOT_SSA)
373 .declare_var(mir_var(local), fx.clif_type(ty).unwrap());
374 match get_pass_mode(fx.tcx, fx.self_sig().abi, ty, false) {
375 PassMode::NoPass => unimplemented!("pass mode nopass"),
376 PassMode::ByVal(_) => fx.bcx.def_var(mir_var(local), ebb_param),
378 let val = CValue::ByRef(ebb_param, fx.layout_of(ty)).load_value(fx);
379 fx.bcx.def_var(mir_var(local), val);
382 fx.local_map.insert(local, CPlace::Var(local, layout));
387 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
388 kind: StackSlotKind::ExplicitSlot,
389 size: layout.size.bytes() as u32,
393 let place = CPlace::from_stack_slot(fx, stack_slot, ty);
396 ArgKind::Normal(ebb_param) => match get_pass_mode(fx.tcx, fx.self_sig().abi, ty, false)
398 PassMode::NoPass => unimplemented!("pass mode nopass"),
399 PassMode::ByVal(_) => {
400 place.write_cvalue(fx, CValue::ByVal(ebb_param, place.layout()))
402 PassMode::ByRef => place.write_cvalue(fx, CValue::ByRef(ebb_param, place.layout())),
404 ArgKind::Spread(ebb_params) => {
405 for (i, ebb_param) in ebb_params.into_iter().enumerate() {
406 let sub_place = place.place_field(fx, mir::Field::new(i));
407 match get_pass_mode(fx.tcx, fx.self_sig().abi, sub_place.layout().ty, false) {
408 PassMode::NoPass => unimplemented!("pass mode nopass"),
409 PassMode::ByVal(_) => {
410 sub_place.write_cvalue(fx, CValue::ByVal(ebb_param, sub_place.layout()))
413 sub_place.write_cvalue(fx, CValue::ByRef(ebb_param, sub_place.layout()))
419 fx.local_map.insert(local, place);
422 for local in fx.mir.vars_and_temps_iter() {
423 let ty = fx.mir.local_decls[local].ty;
424 let layout = fx.layout_of(ty);
426 let place = if ssa_analyzed
429 .contains(crate::analyze::Flags::NOT_SSA)
431 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
432 kind: StackSlotKind::ExplicitSlot,
433 size: layout.size.bytes() as u32,
436 CPlace::from_stack_slot(fx, stack_slot, ty)
439 .declare_var(mir_var(local), fx.clif_type(ty).unwrap());
440 CPlace::Var(local, layout)
443 fx.local_map.insert(local, place);
448 .jump(*fx.ebb_map.get(&START_BLOCK).unwrap(), &[]);
451 pub fn codegen_terminator_call<'a, 'tcx: 'a>(
452 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
453 func: &Operand<'tcx>,
454 args: &[Operand<'tcx>],
455 destination: &Option<(Place<'tcx>, BasicBlock)>,
457 let fn_ty = fx.monomorphize(&func.ty(fx.mir, fx.tcx));
458 let sig = ty_fn_sig(fx.tcx, fn_ty);
460 // Unpack arguments tuple for closures
461 let args = if sig.abi == Abi::RustCall {
462 assert_eq!(args.len(), 2, "rust-call abi requires two arguments");
463 let self_arg = trans_operand(fx, &args[0]);
464 let pack_arg = trans_operand(fx, &args[1]);
465 let mut args = Vec::new();
467 match pack_arg.layout().ty.sty {
468 ty::Tuple(ref tupled_arguments) => {
469 for (i, _) in tupled_arguments.iter().enumerate() {
470 args.push(pack_arg.value_field(fx, mir::Field::new(i)));
473 _ => bug!("argument to function with \"rust-call\" ABI is not a tuple"),
478 .map(|arg| trans_operand(fx, arg))
482 let destination = destination
484 .map(|&(ref place, bb)| (trans_place(fx, place), bb));
486 if let ty::FnDef(def_id, substs) = fn_ty.sty {
487 let sig = ty_fn_sig(fx.tcx, fn_ty);
489 if sig.abi == Abi::RustIntrinsic {
490 crate::intrinsics::codegen_intrinsic_call(fx, def_id, substs, args, destination);
500 destination.map(|(place, _)| place),
503 if let Some((_, dest)) = destination {
504 let ret_ebb = fx.get_ebb(dest);
505 fx.bcx.ins().jump(ret_ebb, &[]);
507 trap_unreachable(&mut fx.bcx);
511 pub fn codegen_call_inner<'a, 'tcx: 'a>(
512 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
513 func: Option<&Operand<'tcx>>,
515 args: Vec<CValue<'tcx>>,
516 ret_place: Option<CPlace<'tcx>>,
518 let sig = ty_fn_sig(fx.tcx, fn_ty);
520 let ret_layout = fx.layout_of(sig.output());
522 let output_pass_mode = get_pass_mode(fx.tcx, sig.abi, sig.output(), true);
523 let return_ptr = match output_pass_mode {
524 PassMode::NoPass => None,
525 PassMode::ByRef => match ret_place {
526 Some(ret_place) => Some(ret_place.expect_addr()),
527 None => Some(fx.bcx.ins().iconst(fx.pointer_type, 0)),
529 PassMode::ByVal(_) => None,
532 let instance = match fn_ty.sty {
533 ty::FnDef(def_id, substs) => {
534 Some(Instance::resolve(fx.tcx, ParamEnv::reveal_all(), def_id, substs).unwrap())
539 let func_ref: Option<Value>; // Indirect call target
542 if let Some(Instance {
543 def: InstanceDef::Virtual(_, idx),
547 let (ptr, method) = crate::vtable::get_ptr_and_method_ref(fx, args[0], idx);
548 func_ref = Some(method);
551 func_ref = if instance.is_none() {
552 let func = trans_operand(fx, func.expect("indirect call without func Operand"));
553 Some(func.load_value(fx))
558 args.get(0).map(|arg| adjust_arg_for_abi(fx, sig, *arg))
563 let call_args: Vec<Value> = return_ptr
569 .map(|arg| adjust_arg_for_abi(fx, sig, arg)),
571 .collect::<Vec<_>>();
573 let sig = fx.bcx.import_signature(clif_sig_from_fn_ty(fx.tcx, fn_ty));
574 let call_inst = if let Some(func_ref) = func_ref {
575 fx.bcx.ins().call_indirect(sig, func_ref, &call_args)
577 let func_ref = fx.get_function_ref(instance.expect("non-indirect call on non-FnDef type"));
578 fx.bcx.ins().call(func_ref, &call_args)
581 match output_pass_mode {
582 PassMode::NoPass => {}
583 PassMode::ByVal(_) => {
584 if let Some(ret_place) = ret_place {
585 let results = fx.bcx.inst_results(call_inst);
586 ret_place.write_cvalue(fx, CValue::ByVal(results[0], ret_layout));
589 PassMode::ByRef => {}
593 pub fn codegen_return(fx: &mut FunctionCx<impl Backend>) {
594 match get_pass_mode(fx.tcx, fx.self_sig().abi, fx.return_type(), true) {
595 PassMode::NoPass | PassMode::ByRef => {
596 fx.bcx.ins().return_(&[]);
598 PassMode::ByVal(_) => {
599 let place = fx.get_local_place(RETURN_PLACE);
600 let ret_val = place.to_cvalue(fx).load_value(fx);
601 fx.bcx.ins().return_(&[ret_val]);