1use std::cmp;
2
3use rustc_abi::{BackendRepr, ExternAbi, HasDataLayout, Reg, Size, WrappingRange};
4use rustc_ast as ast;
5use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
6use rustc_data_structures::packed::Pu128;
7use rustc_hir::lang_items::LangItem;
8use rustc_middle::mir::{self, AssertKind, InlineAsmMacro, SwitchTargets, UnwindTerminateReason};
9use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf, ValidityRequirement};
10use rustc_middle::ty::print::{with_no_trimmed_paths, with_no_visible_paths};
11use rustc_middle::ty::{self, Instance, Ty};
12use rustc_middle::{bug, span_bug};
13use rustc_session::config::OptLevel;
14use rustc_span::Span;
15use rustc_span::source_map::Spanned;
16use rustc_target::callconv::{ArgAbi, FnAbi, PassMode};
17use tracing::{debug, info};
18
19use super::operand::OperandRef;
20use super::operand::OperandValue::{Immediate, Pair, Ref, ZeroSized};
21use super::place::{PlaceRef, PlaceValue};
22use super::{CachedLlbb, FunctionCx, LocalRef};
23use crate::base::{self, is_call_from_compiler_builtins_to_upstream_monomorphization};
24use crate::common::{self, IntPredicate};
25use crate::errors::CompilerBuiltinsCannotCall;
26use crate::traits::*;
27use crate::{MemFlags, meth};
28
29#[derive(Debug, PartialEq)]
33enum MergingSucc {
34 False,
35 True,
36}
37
38struct TerminatorCodegenHelper<'tcx> {
41 bb: mir::BasicBlock,
42 terminator: &'tcx mir::Terminator<'tcx>,
43}
44
45impl<'a, 'tcx> TerminatorCodegenHelper<'tcx> {
46 fn funclet<'b, Bx: BuilderMethods<'a, 'tcx>>(
49 &self,
50 fx: &'b mut FunctionCx<'a, 'tcx, Bx>,
51 ) -> Option<&'b Bx::Funclet> {
52 let cleanup_kinds = fx.cleanup_kinds.as_ref()?;
53 let funclet_bb = cleanup_kinds[self.bb].funclet_bb(self.bb)?;
54 if fx.funclets[funclet_bb].is_none() {
63 fx.landing_pad_for(funclet_bb);
64 }
65 Some(
66 fx.funclets[funclet_bb]
67 .as_ref()
68 .expect("landing_pad_for didn't also create funclets entry"),
69 )
70 }
71
72 fn llbb_with_cleanup<Bx: BuilderMethods<'a, 'tcx>>(
75 &self,
76 fx: &mut FunctionCx<'a, 'tcx, Bx>,
77 target: mir::BasicBlock,
78 ) -> Bx::BasicBlock {
79 let (needs_landing_pad, is_cleanupret) = self.llbb_characteristics(fx, target);
80 let mut lltarget = fx.llbb(target);
81 if needs_landing_pad {
82 lltarget = fx.landing_pad_for(target);
83 }
84 if is_cleanupret {
85 assert!(base::wants_new_eh_instructions(fx.cx.tcx().sess));
87 debug!("llbb_with_cleanup: creating cleanup trampoline for {:?}", target);
88 let name = &format!("{:?}_cleanup_trampoline_{:?}", self.bb, target);
89 let trampoline_llbb = Bx::append_block(fx.cx, fx.llfn, name);
90 let mut trampoline_bx = Bx::build(fx.cx, trampoline_llbb);
91 trampoline_bx.cleanup_ret(self.funclet(fx).unwrap(), Some(lltarget));
92 trampoline_llbb
93 } else {
94 lltarget
95 }
96 }
97
98 fn llbb_characteristics<Bx: BuilderMethods<'a, 'tcx>>(
99 &self,
100 fx: &mut FunctionCx<'a, 'tcx, Bx>,
101 target: mir::BasicBlock,
102 ) -> (bool, bool) {
103 if let Some(ref cleanup_kinds) = fx.cleanup_kinds {
104 let funclet_bb = cleanup_kinds[self.bb].funclet_bb(self.bb);
105 let target_funclet = cleanup_kinds[target].funclet_bb(target);
106 let (needs_landing_pad, is_cleanupret) = match (funclet_bb, target_funclet) {
107 (None, None) => (false, false),
108 (None, Some(_)) => (true, false),
109 (Some(f), Some(t_f)) => (f != t_f, f != t_f),
110 (Some(_), None) => {
111 let span = self.terminator.source_info.span;
112 span_bug!(span, "{:?} - jump out of cleanup?", self.terminator);
113 }
114 };
115 (needs_landing_pad, is_cleanupret)
116 } else {
117 let needs_landing_pad = !fx.mir[self.bb].is_cleanup && fx.mir[target].is_cleanup;
118 let is_cleanupret = false;
119 (needs_landing_pad, is_cleanupret)
120 }
121 }
122
123 fn funclet_br<Bx: BuilderMethods<'a, 'tcx>>(
124 &self,
125 fx: &mut FunctionCx<'a, 'tcx, Bx>,
126 bx: &mut Bx,
127 target: mir::BasicBlock,
128 mergeable_succ: bool,
129 ) -> MergingSucc {
130 let (needs_landing_pad, is_cleanupret) = self.llbb_characteristics(fx, target);
131 if mergeable_succ && !needs_landing_pad && !is_cleanupret {
132 MergingSucc::True
134 } else {
135 let mut lltarget = fx.llbb(target);
136 if needs_landing_pad {
137 lltarget = fx.landing_pad_for(target);
138 }
139 if is_cleanupret {
140 bx.cleanup_ret(self.funclet(fx).unwrap(), Some(lltarget));
143 } else {
144 bx.br(lltarget);
145 }
146 MergingSucc::False
147 }
148 }
149
150 fn do_call<Bx: BuilderMethods<'a, 'tcx>>(
153 &self,
154 fx: &mut FunctionCx<'a, 'tcx, Bx>,
155 bx: &mut Bx,
156 fn_abi: &'tcx FnAbi<'tcx, Ty<'tcx>>,
157 fn_ptr: Bx::Value,
158 llargs: &[Bx::Value],
159 destination: Option<(ReturnDest<'tcx, Bx::Value>, mir::BasicBlock)>,
160 mut unwind: mir::UnwindAction,
161 lifetime_ends_after_call: &[(Bx::Value, Size)],
162 instance: Option<Instance<'tcx>>,
163 mergeable_succ: bool,
164 ) -> MergingSucc {
165 let tcx = bx.tcx();
166 if let Some(instance) = instance
167 && is_call_from_compiler_builtins_to_upstream_monomorphization(tcx, instance)
168 {
169 if destination.is_some() {
170 let caller_def = fx.instance.def_id();
171 let e = CompilerBuiltinsCannotCall {
172 span: tcx.def_span(caller_def),
173 caller: with_no_trimmed_paths!(tcx.def_path_str(caller_def)),
174 callee: with_no_trimmed_paths!(tcx.def_path_str(instance.def_id())),
175 };
176 tcx.dcx().emit_err(e);
177 } else {
178 info!(
179 "compiler_builtins call to diverging function {:?} replaced with abort",
180 instance.def_id()
181 );
182 bx.abort();
183 bx.unreachable();
184 return MergingSucc::False;
185 }
186 }
187
188 let fn_ty = bx.fn_decl_backend_type(fn_abi);
191
192 let fn_attrs = if bx.tcx().def_kind(fx.instance.def_id()).has_codegen_attrs() {
193 Some(bx.tcx().codegen_fn_attrs(fx.instance.def_id()))
194 } else {
195 None
196 };
197
198 if !fn_abi.can_unwind {
199 unwind = mir::UnwindAction::Unreachable;
200 }
201
202 let unwind_block = match unwind {
203 mir::UnwindAction::Cleanup(cleanup) => Some(self.llbb_with_cleanup(fx, cleanup)),
204 mir::UnwindAction::Continue => None,
205 mir::UnwindAction::Unreachable => None,
206 mir::UnwindAction::Terminate(reason) => {
207 if fx.mir[self.bb].is_cleanup && base::wants_new_eh_instructions(fx.cx.tcx().sess) {
208 None
218 } else {
219 Some(fx.terminate_block(reason))
220 }
221 }
222 };
223
224 if let Some(unwind_block) = unwind_block {
225 let ret_llbb = if let Some((_, target)) = destination {
226 fx.llbb(target)
227 } else {
228 fx.unreachable_block()
229 };
230 let invokeret = bx.invoke(
231 fn_ty,
232 fn_attrs,
233 Some(fn_abi),
234 fn_ptr,
235 llargs,
236 ret_llbb,
237 unwind_block,
238 self.funclet(fx),
239 instance,
240 );
241 if fx.mir[self.bb].is_cleanup {
242 bx.apply_attrs_to_cleanup_callsite(invokeret);
243 }
244
245 if let Some((ret_dest, target)) = destination {
246 bx.switch_to_block(fx.llbb(target));
247 fx.set_debug_loc(bx, self.terminator.source_info);
248 for &(tmp, size) in lifetime_ends_after_call {
249 bx.lifetime_end(tmp, size);
250 }
251 fx.store_return(bx, ret_dest, &fn_abi.ret, invokeret);
252 }
253 MergingSucc::False
254 } else {
255 let llret =
256 bx.call(fn_ty, fn_attrs, Some(fn_abi), fn_ptr, llargs, self.funclet(fx), instance);
257 if fx.mir[self.bb].is_cleanup {
258 bx.apply_attrs_to_cleanup_callsite(llret);
259 }
260
261 if let Some((ret_dest, target)) = destination {
262 for &(tmp, size) in lifetime_ends_after_call {
263 bx.lifetime_end(tmp, size);
264 }
265 fx.store_return(bx, ret_dest, &fn_abi.ret, llret);
266 self.funclet_br(fx, bx, target, mergeable_succ)
267 } else {
268 bx.unreachable();
269 MergingSucc::False
270 }
271 }
272 }
273
274 fn do_inlineasm<Bx: BuilderMethods<'a, 'tcx>>(
276 &self,
277 fx: &mut FunctionCx<'a, 'tcx, Bx>,
278 bx: &mut Bx,
279 template: &[InlineAsmTemplatePiece],
280 operands: &[InlineAsmOperandRef<'tcx, Bx>],
281 options: InlineAsmOptions,
282 line_spans: &[Span],
283 destination: Option<mir::BasicBlock>,
284 unwind: mir::UnwindAction,
285 instance: Instance<'_>,
286 mergeable_succ: bool,
287 ) -> MergingSucc {
288 let unwind_target = match unwind {
289 mir::UnwindAction::Cleanup(cleanup) => Some(self.llbb_with_cleanup(fx, cleanup)),
290 mir::UnwindAction::Terminate(reason) => Some(fx.terminate_block(reason)),
291 mir::UnwindAction::Continue => None,
292 mir::UnwindAction::Unreachable => None,
293 };
294
295 if operands.iter().any(|x| matches!(x, InlineAsmOperandRef::Label { .. })) {
296 assert!(unwind_target.is_none());
297 let ret_llbb = if let Some(target) = destination {
298 fx.llbb(target)
299 } else {
300 fx.unreachable_block()
301 };
302
303 bx.codegen_inline_asm(
304 template,
305 operands,
306 options,
307 line_spans,
308 instance,
309 Some(ret_llbb),
310 None,
311 );
312 MergingSucc::False
313 } else if let Some(cleanup) = unwind_target {
314 let ret_llbb = if let Some(target) = destination {
315 fx.llbb(target)
316 } else {
317 fx.unreachable_block()
318 };
319
320 bx.codegen_inline_asm(
321 template,
322 operands,
323 options,
324 line_spans,
325 instance,
326 Some(ret_llbb),
327 Some((cleanup, self.funclet(fx))),
328 );
329 MergingSucc::False
330 } else {
331 bx.codegen_inline_asm(template, operands, options, line_spans, instance, None, None);
332
333 if let Some(target) = destination {
334 self.funclet_br(fx, bx, target, mergeable_succ)
335 } else {
336 bx.unreachable();
337 MergingSucc::False
338 }
339 }
340 }
341}
342
343impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
345 fn codegen_resume_terminator(&mut self, helper: TerminatorCodegenHelper<'tcx>, bx: &mut Bx) {
347 if let Some(funclet) = helper.funclet(self) {
348 bx.cleanup_ret(funclet, None);
349 } else {
350 let slot = self.get_personality_slot(bx);
351 let exn0 = slot.project_field(bx, 0);
352 let exn0 = bx.load_operand(exn0).immediate();
353 let exn1 = slot.project_field(bx, 1);
354 let exn1 = bx.load_operand(exn1).immediate();
355 slot.storage_dead(bx);
356
357 bx.resume(exn0, exn1);
358 }
359 }
360
361 fn codegen_switchint_terminator(
362 &mut self,
363 helper: TerminatorCodegenHelper<'tcx>,
364 bx: &mut Bx,
365 discr: &mir::Operand<'tcx>,
366 targets: &SwitchTargets,
367 ) {
368 let discr = self.codegen_operand(bx, discr);
369 let discr_value = discr.immediate();
370 let switch_ty = discr.layout.ty;
371 if let Some(const_discr) = bx.const_to_opt_u128(discr_value, false) {
373 let target = targets.target_for_value(const_discr);
374 bx.br(helper.llbb_with_cleanup(self, target));
375 return;
376 };
377
378 let mut target_iter = targets.iter();
379 if target_iter.len() == 1 {
380 let (test_value, target) = target_iter.next().unwrap();
383 let otherwise = targets.otherwise();
384 let lltarget = helper.llbb_with_cleanup(self, target);
385 let llotherwise = helper.llbb_with_cleanup(self, otherwise);
386 let target_cold = self.cold_blocks[target];
387 let otherwise_cold = self.cold_blocks[otherwise];
388 let expect = if target_cold == otherwise_cold { None } else { Some(otherwise_cold) };
392 if switch_ty == bx.tcx().types.bool {
393 match test_value {
395 0 => {
396 let expect = expect.map(|e| !e);
397 bx.cond_br_with_expect(discr_value, llotherwise, lltarget, expect);
398 }
399 1 => {
400 bx.cond_br_with_expect(discr_value, lltarget, llotherwise, expect);
401 }
402 _ => bug!(),
403 }
404 } else {
405 let switch_llty = bx.immediate_backend_type(bx.layout_of(switch_ty));
406 let llval = bx.const_uint_big(switch_llty, test_value);
407 let cmp = bx.icmp(IntPredicate::IntEQ, discr_value, llval);
408 bx.cond_br_with_expect(cmp, lltarget, llotherwise, expect);
409 }
410 } else if target_iter.len() == 2
411 && self.mir[targets.otherwise()].is_empty_unreachable()
412 && targets.all_values().contains(&Pu128(0))
413 && targets.all_values().contains(&Pu128(1))
414 {
415 let true_bb = targets.target_for_value(1);
419 let false_bb = targets.target_for_value(0);
420 let true_ll = helper.llbb_with_cleanup(self, true_bb);
421 let false_ll = helper.llbb_with_cleanup(self, false_bb);
422
423 let expected_cond_value = if self.cx.sess().opts.optimize == OptLevel::No {
424 None
425 } else {
426 match (self.cold_blocks[true_bb], self.cold_blocks[false_bb]) {
427 (true, true) | (false, false) => None,
429 (true, false) => Some(false),
431 (false, true) => Some(true),
432 }
433 };
434
435 let bool_ty = bx.tcx().types.bool;
436 let cond = if switch_ty == bool_ty {
437 discr_value
438 } else {
439 let bool_llty = bx.immediate_backend_type(bx.layout_of(bool_ty));
440 bx.unchecked_utrunc(discr_value, bool_llty)
441 };
442 bx.cond_br_with_expect(cond, true_ll, false_ll, expected_cond_value);
443 } else if self.cx.sess().opts.optimize == OptLevel::No
444 && target_iter.len() == 2
445 && self.mir[targets.otherwise()].is_empty_unreachable()
446 {
447 let (test_value1, target1) = target_iter.next().unwrap();
460 let (_test_value2, target2) = target_iter.next().unwrap();
461 let ll1 = helper.llbb_with_cleanup(self, target1);
462 let ll2 = helper.llbb_with_cleanup(self, target2);
463 let switch_llty = bx.immediate_backend_type(bx.layout_of(switch_ty));
464 let llval = bx.const_uint_big(switch_llty, test_value1);
465 let cmp = bx.icmp(IntPredicate::IntEQ, discr_value, llval);
466 bx.cond_br(cmp, ll1, ll2);
467 } else {
468 let otherwise = targets.otherwise();
469 let otherwise_cold = self.cold_blocks[otherwise];
470 let otherwise_unreachable = self.mir[otherwise].is_empty_unreachable();
471 let cold_count = targets.iter().filter(|(_, target)| self.cold_blocks[*target]).count();
472 let none_cold = cold_count == 0;
473 let all_cold = cold_count == targets.iter().len();
474 if (none_cold && (!otherwise_cold || otherwise_unreachable))
475 || (all_cold && (otherwise_cold || otherwise_unreachable))
476 {
477 bx.switch(
480 discr_value,
481 helper.llbb_with_cleanup(self, targets.otherwise()),
482 target_iter
483 .map(|(value, target)| (value, helper.llbb_with_cleanup(self, target))),
484 );
485 } else {
486 bx.switch_with_weights(
488 discr_value,
489 helper.llbb_with_cleanup(self, targets.otherwise()),
490 otherwise_cold,
491 target_iter.map(|(value, target)| {
492 (value, helper.llbb_with_cleanup(self, target), self.cold_blocks[target])
493 }),
494 );
495 }
496 }
497 }
498
499 fn codegen_return_terminator(&mut self, bx: &mut Bx) {
500 if self.fn_abi.c_variadic {
502 let va_list_arg_idx = self.fn_abi.args.len();
504 match self.locals[mir::Local::from_usize(1 + va_list_arg_idx)] {
505 LocalRef::Place(va_list) => {
506 bx.va_end(va_list.val.llval);
507 }
508 _ => bug!("C-variadic function must have a `VaList` place"),
509 }
510 }
511 if self.fn_abi.ret.layout.is_uninhabited() {
512 bx.abort();
517 bx.unreachable();
520 return;
521 }
522 let llval = match &self.fn_abi.ret.mode {
523 PassMode::Ignore | PassMode::Indirect { .. } => {
524 bx.ret_void();
525 return;
526 }
527
528 PassMode::Direct(_) | PassMode::Pair(..) => {
529 let op = self.codegen_consume(bx, mir::Place::return_place().as_ref());
530 if let Ref(place_val) = op.val {
531 bx.load_from_place(bx.backend_type(op.layout), place_val)
532 } else {
533 op.immediate_or_packed_pair(bx)
534 }
535 }
536
537 PassMode::Cast { cast: cast_ty, pad_i32: _ } => {
538 let op = match self.locals[mir::RETURN_PLACE] {
539 LocalRef::Operand(op) => op,
540 LocalRef::PendingOperand => bug!("use of return before def"),
541 LocalRef::Place(cg_place) => {
542 OperandRef { val: Ref(cg_place.val), layout: cg_place.layout }
543 }
544 LocalRef::UnsizedPlace(_) => bug!("return type must be sized"),
545 };
546 let llslot = match op.val {
547 Immediate(_) | Pair(..) => {
548 let scratch = PlaceRef::alloca(bx, self.fn_abi.ret.layout);
549 op.val.store(bx, scratch);
550 scratch.val.llval
551 }
552 Ref(place_val) => {
553 assert_eq!(
554 place_val.align, op.layout.align.abi,
555 "return place is unaligned!"
556 );
557 place_val.llval
558 }
559 ZeroSized => bug!("ZST return value shouldn't be in PassMode::Cast"),
560 };
561 let ty = bx.cast_backend_type(cast_ty);
562 bx.load(ty, llslot, self.fn_abi.ret.layout.align.abi)
563 }
564 };
565 bx.ret(llval);
566 }
567
568 #[tracing::instrument(level = "trace", skip(self, helper, bx))]
569 fn codegen_drop_terminator(
570 &mut self,
571 helper: TerminatorCodegenHelper<'tcx>,
572 bx: &mut Bx,
573 source_info: &mir::SourceInfo,
574 location: mir::Place<'tcx>,
575 target: mir::BasicBlock,
576 unwind: mir::UnwindAction,
577 mergeable_succ: bool,
578 ) -> MergingSucc {
579 let ty = location.ty(self.mir, bx.tcx()).ty;
580 let ty = self.monomorphize(ty);
581 let drop_fn = Instance::resolve_drop_in_place(bx.tcx(), ty);
582
583 if let ty::InstanceKind::DropGlue(_, None) = drop_fn.def {
584 return helper.funclet_br(self, bx, target, mergeable_succ);
586 }
587
588 let place = self.codegen_place(bx, location.as_ref());
589 let (args1, args2);
590 let mut args = if let Some(llextra) = place.val.llextra {
591 args2 = [place.val.llval, llextra];
592 &args2[..]
593 } else {
594 args1 = [place.val.llval];
595 &args1[..]
596 };
597 let (maybe_null, drop_fn, fn_abi, drop_instance) = match ty.kind() {
598 ty::Dynamic(_, _, ty::Dyn) => {
601 let virtual_drop = Instance {
614 def: ty::InstanceKind::Virtual(drop_fn.def_id(), 0), args: drop_fn.args,
616 };
617 debug!("ty = {:?}", ty);
618 debug!("drop_fn = {:?}", drop_fn);
619 debug!("args = {:?}", args);
620 let fn_abi = bx.fn_abi_of_instance(virtual_drop, ty::List::empty());
621 let vtable = args[1];
622 args = &args[..1];
624 (
625 true,
626 meth::VirtualIndex::from_index(ty::COMMON_VTABLE_ENTRIES_DROPINPLACE)
627 .get_optional_fn(bx, vtable, ty, fn_abi),
628 fn_abi,
629 virtual_drop,
630 )
631 }
632 ty::Dynamic(_, _, ty::DynStar) => {
633 let virtual_drop = Instance {
656 def: ty::InstanceKind::Virtual(drop_fn.def_id(), 0), args: drop_fn.args,
658 };
659 debug!("ty = {:?}", ty);
660 debug!("drop_fn = {:?}", drop_fn);
661 debug!("args = {:?}", args);
662 let fn_abi = bx.fn_abi_of_instance(virtual_drop, ty::List::empty());
663 let meta_ptr = place.project_field(bx, 1);
664 let meta = bx.load_operand(meta_ptr);
665 args = &args[..1];
667 debug!("args' = {:?}", args);
668 (
669 true,
670 meth::VirtualIndex::from_index(ty::COMMON_VTABLE_ENTRIES_DROPINPLACE)
671 .get_optional_fn(bx, meta.immediate(), ty, fn_abi),
672 fn_abi,
673 virtual_drop,
674 )
675 }
676 _ => (
677 false,
678 bx.get_fn_addr(drop_fn),
679 bx.fn_abi_of_instance(drop_fn, ty::List::empty()),
680 drop_fn,
681 ),
682 };
683
684 if maybe_null {
687 let is_not_null = bx.append_sibling_block("is_not_null");
688 let llty = bx.fn_ptr_backend_type(fn_abi);
689 let null = bx.const_null(llty);
690 let non_null =
691 bx.icmp(base::bin_op_to_icmp_predicate(mir::BinOp::Ne, false), drop_fn, null);
692 bx.cond_br(non_null, is_not_null, helper.llbb_with_cleanup(self, target));
693 bx.switch_to_block(is_not_null);
694 self.set_debug_loc(bx, *source_info);
695 }
696
697 helper.do_call(
698 self,
699 bx,
700 fn_abi,
701 drop_fn,
702 args,
703 Some((ReturnDest::Nothing, target)),
704 unwind,
705 &[],
706 Some(drop_instance),
707 !maybe_null && mergeable_succ,
708 )
709 }
710
711 fn codegen_assert_terminator(
712 &mut self,
713 helper: TerminatorCodegenHelper<'tcx>,
714 bx: &mut Bx,
715 terminator: &mir::Terminator<'tcx>,
716 cond: &mir::Operand<'tcx>,
717 expected: bool,
718 msg: &mir::AssertMessage<'tcx>,
719 target: mir::BasicBlock,
720 unwind: mir::UnwindAction,
721 mergeable_succ: bool,
722 ) -> MergingSucc {
723 let span = terminator.source_info.span;
724 let cond = self.codegen_operand(bx, cond).immediate();
725 let mut const_cond = bx.const_to_opt_u128(cond, false).map(|c| c == 1);
726
727 if !bx.sess().overflow_checks() && msg.is_optional_overflow_check() {
732 const_cond = Some(expected);
733 }
734
735 if const_cond == Some(expected) {
737 return helper.funclet_br(self, bx, target, mergeable_succ);
738 }
739
740 let lltarget = helper.llbb_with_cleanup(self, target);
745 let panic_block = bx.append_sibling_block("panic");
746 if expected {
747 bx.cond_br(cond, lltarget, panic_block);
748 } else {
749 bx.cond_br(cond, panic_block, lltarget);
750 }
751
752 bx.switch_to_block(panic_block);
754 self.set_debug_loc(bx, terminator.source_info);
755
756 let location = self.get_caller_location(bx, terminator.source_info).immediate();
758
759 let (lang_item, args) = match msg {
761 AssertKind::BoundsCheck { len, index } => {
762 let len = self.codegen_operand(bx, len).immediate();
763 let index = self.codegen_operand(bx, index).immediate();
764 (LangItem::PanicBoundsCheck, vec![index, len, location])
767 }
768 AssertKind::MisalignedPointerDereference { required, found } => {
769 let required = self.codegen_operand(bx, required).immediate();
770 let found = self.codegen_operand(bx, found).immediate();
771 (LangItem::PanicMisalignedPointerDereference, vec![required, found, location])
774 }
775 AssertKind::NullPointerDereference => {
776 (LangItem::PanicNullPointerDereference, vec![location])
779 }
780 _ => {
781 (msg.panic_function(), vec![location])
783 }
784 };
785
786 let (fn_abi, llfn, instance) = common::build_langcall(bx, span, lang_item);
787
788 let merging_succ =
790 helper.do_call(self, bx, fn_abi, llfn, &args, None, unwind, &[], Some(instance), false);
791 assert_eq!(merging_succ, MergingSucc::False);
792 MergingSucc::False
793 }
794
795 fn codegen_terminate_terminator(
796 &mut self,
797 helper: TerminatorCodegenHelper<'tcx>,
798 bx: &mut Bx,
799 terminator: &mir::Terminator<'tcx>,
800 reason: UnwindTerminateReason,
801 ) {
802 let span = terminator.source_info.span;
803 self.set_debug_loc(bx, terminator.source_info);
804
805 let (fn_abi, llfn, instance) = common::build_langcall(bx, span, reason.lang_item());
807
808 let merging_succ = helper.do_call(
810 self,
811 bx,
812 fn_abi,
813 llfn,
814 &[],
815 None,
816 mir::UnwindAction::Unreachable,
817 &[],
818 Some(instance),
819 false,
820 );
821 assert_eq!(merging_succ, MergingSucc::False);
822 }
823
824 fn codegen_panic_intrinsic(
826 &mut self,
827 helper: &TerminatorCodegenHelper<'tcx>,
828 bx: &mut Bx,
829 intrinsic: ty::IntrinsicDef,
830 instance: Instance<'tcx>,
831 source_info: mir::SourceInfo,
832 target: Option<mir::BasicBlock>,
833 unwind: mir::UnwindAction,
834 mergeable_succ: bool,
835 ) -> Option<MergingSucc> {
836 let Some(requirement) = ValidityRequirement::from_intrinsic(intrinsic.name) else {
840 return None;
841 };
842
843 let ty = instance.args.type_at(0);
844
845 let is_valid = bx
846 .tcx()
847 .check_validity_requirement((requirement, bx.typing_env().as_query_input(ty)))
848 .expect("expect to have layout during codegen");
849
850 if is_valid {
851 let target = target.unwrap();
853 return Some(helper.funclet_br(self, bx, target, mergeable_succ));
854 }
855
856 let layout = bx.layout_of(ty);
857
858 let msg_str = with_no_visible_paths!({
859 with_no_trimmed_paths!({
860 if layout.is_uninhabited() {
861 format!("attempted to instantiate uninhabited type `{ty}`")
863 } else if requirement == ValidityRequirement::Zero {
864 format!("attempted to zero-initialize type `{ty}`, which is invalid")
865 } else {
866 format!("attempted to leave type `{ty}` uninitialized, which is invalid")
867 }
868 })
869 });
870 let msg = bx.const_str(&msg_str);
871
872 let (fn_abi, llfn, instance) =
874 common::build_langcall(bx, source_info.span, LangItem::PanicNounwind);
875
876 Some(helper.do_call(
878 self,
879 bx,
880 fn_abi,
881 llfn,
882 &[msg.0, msg.1],
883 target.as_ref().map(|bb| (ReturnDest::Nothing, *bb)),
884 unwind,
885 &[],
886 Some(instance),
887 mergeable_succ,
888 ))
889 }
890
891 fn codegen_call_terminator(
892 &mut self,
893 helper: TerminatorCodegenHelper<'tcx>,
894 bx: &mut Bx,
895 terminator: &mir::Terminator<'tcx>,
896 func: &mir::Operand<'tcx>,
897 args: &[Spanned<mir::Operand<'tcx>>],
898 destination: mir::Place<'tcx>,
899 target: Option<mir::BasicBlock>,
900 unwind: mir::UnwindAction,
901 fn_span: Span,
902 mergeable_succ: bool,
903 ) -> MergingSucc {
904 let source_info = mir::SourceInfo { span: fn_span, ..terminator.source_info };
905
906 let callee = self.codegen_operand(bx, func);
908
909 let (instance, mut llfn) = match *callee.layout.ty.kind() {
910 ty::FnDef(def_id, generic_args) => {
911 let instance = ty::Instance::expect_resolve(
912 bx.tcx(),
913 bx.typing_env(),
914 def_id,
915 generic_args,
916 fn_span,
917 );
918
919 let instance = match instance.def {
920 ty::InstanceKind::DropGlue(_, None) => {
923 let target = target.unwrap();
925 return helper.funclet_br(self, bx, target, mergeable_succ);
926 }
927 ty::InstanceKind::Intrinsic(def_id) => {
928 let intrinsic = bx.tcx().intrinsic(def_id).unwrap();
929 if let Some(merging_succ) = self.codegen_panic_intrinsic(
930 &helper,
931 bx,
932 intrinsic,
933 instance,
934 source_info,
935 target,
936 unwind,
937 mergeable_succ,
938 ) {
939 return merging_succ;
940 }
941
942 let result_layout =
943 self.cx.layout_of(self.monomorphized_place_ty(destination.as_ref()));
944
945 let (result, store_in_local) = if result_layout.is_zst() {
946 (
947 PlaceRef::new_sized(bx.const_undef(bx.type_ptr()), result_layout),
948 None,
949 )
950 } else if let Some(local) = destination.as_local() {
951 match self.locals[local] {
952 LocalRef::Place(dest) => (dest, None),
953 LocalRef::UnsizedPlace(_) => bug!("return type must be sized"),
954 LocalRef::PendingOperand => {
955 let tmp = PlaceRef::alloca(bx, result_layout);
959 tmp.storage_live(bx);
960 (tmp, Some(local))
961 }
962 LocalRef::Operand(_) => {
963 bug!("place local already assigned to");
964 }
965 }
966 } else {
967 (self.codegen_place(bx, destination.as_ref()), None)
968 };
969
970 if result.val.align < result.layout.align.abi {
971 span_bug!(self.mir.span, "can't directly store to unaligned value");
978 }
979
980 let args: Vec<_> =
981 args.iter().map(|arg| self.codegen_operand(bx, &arg.node)).collect();
982
983 match self.codegen_intrinsic_call(bx, instance, &args, result, source_info)
984 {
985 Ok(()) => {
986 if let Some(local) = store_in_local {
987 let op = bx.load_operand(result);
988 result.storage_dead(bx);
989 self.overwrite_local(local, LocalRef::Operand(op));
990 self.debug_introduce_local(bx, local);
991 }
992
993 return if let Some(target) = target {
994 helper.funclet_br(self, bx, target, mergeable_succ)
995 } else {
996 bx.unreachable();
997 MergingSucc::False
998 };
999 }
1000 Err(instance) => {
1001 if intrinsic.must_be_overridden {
1002 span_bug!(
1003 fn_span,
1004 "intrinsic {} must be overridden by codegen backend, but isn't",
1005 intrinsic.name,
1006 );
1007 }
1008 instance
1009 }
1010 }
1011 }
1012 _ => instance,
1013 };
1014
1015 (Some(instance), None)
1016 }
1017 ty::FnPtr(..) => (None, Some(callee.immediate())),
1018 _ => bug!("{} is not callable", callee.layout.ty),
1019 };
1020
1021 let sig = callee.layout.ty.fn_sig(bx.tcx());
1025
1026 let extra_args = &args[sig.inputs().skip_binder().len()..];
1027 let extra_args = bx.tcx().mk_type_list_from_iter(extra_args.iter().map(|op_arg| {
1028 let op_ty = op_arg.node.ty(self.mir, bx.tcx());
1029 self.monomorphize(op_ty)
1030 }));
1031
1032 let fn_abi = match instance {
1033 Some(instance) => bx.fn_abi_of_instance(instance, extra_args),
1034 None => bx.fn_abi_of_fn_ptr(sig, extra_args),
1035 };
1036
1037 let arg_count = fn_abi.args.len() + fn_abi.ret.is_indirect() as usize;
1039
1040 let mut llargs = Vec::with_capacity(arg_count);
1041
1042 let return_dest = self.make_return_dest(bx, destination, &fn_abi.ret, &mut llargs);
1046 let destination = target.map(|target| (return_dest, target));
1047
1048 let (first_args, untuple) = if sig.abi() == ExternAbi::RustCall
1050 && let Some((tup, args)) = args.split_last()
1051 {
1052 (args, Some(tup))
1053 } else {
1054 (args, None)
1055 };
1056
1057 let mut lifetime_ends_after_call: Vec<(Bx::Value, Size)> = Vec::new();
1061 'make_args: for (i, arg) in first_args.iter().enumerate() {
1062 let mut op = self.codegen_operand(bx, &arg.node);
1063
1064 if let (0, Some(ty::InstanceKind::Virtual(_, idx))) = (i, instance.map(|i| i.def)) {
1065 match op.val {
1066 Pair(data_ptr, meta) => {
1067 while !op.layout.ty.is_raw_ptr() && !op.layout.ty.is_ref() {
1077 let (idx, _) = op.layout.non_1zst_field(bx).expect(
1078 "not exactly one non-1-ZST field in a `DispatchFromDyn` type",
1079 );
1080 op = op.extract_field(self, bx, idx.as_usize());
1081 }
1082
1083 llfn = Some(meth::VirtualIndex::from_index(idx).get_fn(
1087 bx,
1088 meta,
1089 op.layout.ty,
1090 fn_abi,
1091 ));
1092 llargs.push(data_ptr);
1093 continue 'make_args;
1094 }
1095 Ref(PlaceValue { llval: data_ptr, llextra: Some(meta), .. }) => {
1096 llfn = Some(meth::VirtualIndex::from_index(idx).get_fn(
1098 bx,
1099 meta,
1100 op.layout.ty,
1101 fn_abi,
1102 ));
1103 llargs.push(data_ptr);
1104 continue;
1105 }
1106 Immediate(_) => {
1107 while !op.layout.ty.is_raw_ptr() && !op.layout.ty.is_ref() {
1109 let (idx, _) = op.layout.non_1zst_field(bx).expect(
1110 "not exactly one non-1-ZST field in a `DispatchFromDyn` type",
1111 );
1112 op = op.extract_field(self, bx, idx.as_usize());
1113 }
1114
1115 if !op.layout.ty.builtin_deref(true).unwrap().is_dyn_star() {
1118 span_bug!(fn_span, "can't codegen a virtual call on {:#?}", op);
1119 }
1120 let place = op.deref(bx.cx());
1121 let data_place = place.project_field(bx, 0);
1122 let meta_place = place.project_field(bx, 1);
1123 let meta = bx.load_operand(meta_place);
1124 llfn = Some(meth::VirtualIndex::from_index(idx).get_fn(
1125 bx,
1126 meta.immediate(),
1127 op.layout.ty,
1128 fn_abi,
1129 ));
1130 llargs.push(data_place.val.llval);
1131 continue;
1132 }
1133 _ => {
1134 span_bug!(fn_span, "can't codegen a virtual call on {:#?}", op);
1135 }
1136 }
1137 }
1138
1139 match (&arg.node, op.val) {
1142 (&mir::Operand::Copy(_), Ref(PlaceValue { llextra: None, .. }))
1143 | (&mir::Operand::Constant(_), Ref(PlaceValue { llextra: None, .. })) => {
1144 let tmp = PlaceRef::alloca(bx, op.layout);
1145 bx.lifetime_start(tmp.val.llval, tmp.layout.size);
1146 op.val.store(bx, tmp);
1147 op.val = Ref(tmp.val);
1148 lifetime_ends_after_call.push((tmp.val.llval, tmp.layout.size));
1149 }
1150 _ => {}
1151 }
1152
1153 self.codegen_argument(
1154 bx,
1155 op,
1156 &mut llargs,
1157 &fn_abi.args[i],
1158 &mut lifetime_ends_after_call,
1159 );
1160 }
1161 let num_untupled = untuple.map(|tup| {
1162 self.codegen_arguments_untupled(
1163 bx,
1164 &tup.node,
1165 &mut llargs,
1166 &fn_abi.args[first_args.len()..],
1167 &mut lifetime_ends_after_call,
1168 )
1169 });
1170
1171 let needs_location =
1172 instance.is_some_and(|i| i.def.requires_caller_location(self.cx.tcx()));
1173 if needs_location {
1174 let mir_args = if let Some(num_untupled) = num_untupled {
1175 first_args.len() + num_untupled
1176 } else {
1177 args.len()
1178 };
1179 assert_eq!(
1180 fn_abi.args.len(),
1181 mir_args + 1,
1182 "#[track_caller] fn's must have 1 more argument in their ABI than in their MIR: {instance:?} {fn_span:?} {fn_abi:?}",
1183 );
1184 let location = self.get_caller_location(bx, source_info);
1185 debug!(
1186 "codegen_call_terminator({:?}): location={:?} (fn_span {:?})",
1187 terminator, location, fn_span
1188 );
1189
1190 let last_arg = fn_abi.args.last().unwrap();
1191 self.codegen_argument(
1192 bx,
1193 location,
1194 &mut llargs,
1195 last_arg,
1196 &mut lifetime_ends_after_call,
1197 );
1198 }
1199
1200 let fn_ptr = match (instance, llfn) {
1201 (Some(instance), None) => bx.get_fn_addr(instance),
1202 (_, Some(llfn)) => llfn,
1203 _ => span_bug!(fn_span, "no instance or llfn for call"),
1204 };
1205 self.set_debug_loc(bx, source_info);
1206 helper.do_call(
1207 self,
1208 bx,
1209 fn_abi,
1210 fn_ptr,
1211 &llargs,
1212 destination,
1213 unwind,
1214 &lifetime_ends_after_call,
1215 instance,
1216 mergeable_succ,
1217 )
1218 }
1219
1220 fn codegen_asm_terminator(
1221 &mut self,
1222 helper: TerminatorCodegenHelper<'tcx>,
1223 bx: &mut Bx,
1224 asm_macro: InlineAsmMacro,
1225 terminator: &mir::Terminator<'tcx>,
1226 template: &[ast::InlineAsmTemplatePiece],
1227 operands: &[mir::InlineAsmOperand<'tcx>],
1228 options: ast::InlineAsmOptions,
1229 line_spans: &[Span],
1230 targets: &[mir::BasicBlock],
1231 unwind: mir::UnwindAction,
1232 instance: Instance<'_>,
1233 mergeable_succ: bool,
1234 ) -> MergingSucc {
1235 let span = terminator.source_info.span;
1236
1237 let operands: Vec<_> = operands
1238 .iter()
1239 .map(|op| match *op {
1240 mir::InlineAsmOperand::In { reg, ref value } => {
1241 let value = self.codegen_operand(bx, value);
1242 InlineAsmOperandRef::In { reg, value }
1243 }
1244 mir::InlineAsmOperand::Out { reg, late, ref place } => {
1245 let place = place.map(|place| self.codegen_place(bx, place.as_ref()));
1246 InlineAsmOperandRef::Out { reg, late, place }
1247 }
1248 mir::InlineAsmOperand::InOut { reg, late, ref in_value, ref out_place } => {
1249 let in_value = self.codegen_operand(bx, in_value);
1250 let out_place =
1251 out_place.map(|out_place| self.codegen_place(bx, out_place.as_ref()));
1252 InlineAsmOperandRef::InOut { reg, late, in_value, out_place }
1253 }
1254 mir::InlineAsmOperand::Const { ref value } => {
1255 let const_value = self.eval_mir_constant(value);
1256 let string = common::asm_const_to_str(
1257 bx.tcx(),
1258 span,
1259 const_value,
1260 bx.layout_of(value.ty()),
1261 );
1262 InlineAsmOperandRef::Const { string }
1263 }
1264 mir::InlineAsmOperand::SymFn { ref value } => {
1265 let const_ = self.monomorphize(value.const_);
1266 if let ty::FnDef(def_id, args) = *const_.ty().kind() {
1267 let instance = ty::Instance::resolve_for_fn_ptr(
1268 bx.tcx(),
1269 bx.typing_env(),
1270 def_id,
1271 args,
1272 )
1273 .unwrap();
1274 InlineAsmOperandRef::SymFn { instance }
1275 } else {
1276 span_bug!(span, "invalid type for asm sym (fn)");
1277 }
1278 }
1279 mir::InlineAsmOperand::SymStatic { def_id } => {
1280 InlineAsmOperandRef::SymStatic { def_id }
1281 }
1282 mir::InlineAsmOperand::Label { target_index } => {
1283 InlineAsmOperandRef::Label { label: self.llbb(targets[target_index]) }
1284 }
1285 })
1286 .collect();
1287
1288 helper.do_inlineasm(
1289 self,
1290 bx,
1291 template,
1292 &operands,
1293 options,
1294 line_spans,
1295 if asm_macro.diverges(options) { None } else { targets.get(0).copied() },
1296 unwind,
1297 instance,
1298 mergeable_succ,
1299 )
1300 }
1301
1302 pub(crate) fn codegen_block(&mut self, mut bb: mir::BasicBlock) {
1303 let llbb = match self.try_llbb(bb) {
1304 Some(llbb) => llbb,
1305 None => return,
1306 };
1307 let bx = &mut Bx::build(self.cx, llbb);
1308 let mir = self.mir;
1309
1310 loop {
1314 let data = &mir[bb];
1315
1316 debug!("codegen_block({:?}={:?})", bb, data);
1317
1318 for statement in &data.statements {
1319 self.codegen_statement(bx, statement);
1320 }
1321
1322 let merging_succ = self.codegen_terminator(bx, bb, data.terminator());
1323 if let MergingSucc::False = merging_succ {
1324 break;
1325 }
1326
1327 let mut successors = data.terminator().successors();
1335 let succ = successors.next().unwrap();
1336 assert!(matches!(self.cached_llbbs[succ], CachedLlbb::None));
1337 self.cached_llbbs[succ] = CachedLlbb::Skip;
1338 bb = succ;
1339 }
1340 }
1341
1342 pub(crate) fn codegen_block_as_unreachable(&mut self, bb: mir::BasicBlock) {
1343 let llbb = match self.try_llbb(bb) {
1344 Some(llbb) => llbb,
1345 None => return,
1346 };
1347 let bx = &mut Bx::build(self.cx, llbb);
1348 debug!("codegen_block_as_unreachable({:?})", bb);
1349 bx.unreachable();
1350 }
1351
1352 fn codegen_terminator(
1353 &mut self,
1354 bx: &mut Bx,
1355 bb: mir::BasicBlock,
1356 terminator: &'tcx mir::Terminator<'tcx>,
1357 ) -> MergingSucc {
1358 debug!("codegen_terminator: {:?}", terminator);
1359
1360 let helper = TerminatorCodegenHelper { bb, terminator };
1361
1362 let mergeable_succ = || {
1363 let mut successors = terminator.successors();
1366 if let Some(succ) = successors.next()
1367 && successors.next().is_none()
1368 && let &[succ_pred] = self.mir.basic_blocks.predecessors()[succ].as_slice()
1369 {
1370 assert_eq!(succ_pred, bb);
1373 true
1374 } else {
1375 false
1376 }
1377 };
1378
1379 self.set_debug_loc(bx, terminator.source_info);
1380 match terminator.kind {
1381 mir::TerminatorKind::UnwindResume => {
1382 self.codegen_resume_terminator(helper, bx);
1383 MergingSucc::False
1384 }
1385
1386 mir::TerminatorKind::UnwindTerminate(reason) => {
1387 self.codegen_terminate_terminator(helper, bx, terminator, reason);
1388 MergingSucc::False
1389 }
1390
1391 mir::TerminatorKind::Goto { target } => {
1392 helper.funclet_br(self, bx, target, mergeable_succ())
1393 }
1394
1395 mir::TerminatorKind::SwitchInt { ref discr, ref targets } => {
1396 self.codegen_switchint_terminator(helper, bx, discr, targets);
1397 MergingSucc::False
1398 }
1399
1400 mir::TerminatorKind::Return => {
1401 self.codegen_return_terminator(bx);
1402 MergingSucc::False
1403 }
1404
1405 mir::TerminatorKind::Unreachable => {
1406 bx.unreachable();
1407 MergingSucc::False
1408 }
1409
1410 mir::TerminatorKind::Drop { place, target, unwind, replace: _, drop, async_fut } => {
1411 assert!(
1412 async_fut.is_none() && drop.is_none(),
1413 "Async Drop must be expanded or reset to sync before codegen"
1414 );
1415 self.codegen_drop_terminator(
1416 helper,
1417 bx,
1418 &terminator.source_info,
1419 place,
1420 target,
1421 unwind,
1422 mergeable_succ(),
1423 )
1424 }
1425
1426 mir::TerminatorKind::Assert { ref cond, expected, ref msg, target, unwind } => self
1427 .codegen_assert_terminator(
1428 helper,
1429 bx,
1430 terminator,
1431 cond,
1432 expected,
1433 msg,
1434 target,
1435 unwind,
1436 mergeable_succ(),
1437 ),
1438
1439 mir::TerminatorKind::Call {
1440 ref func,
1441 ref args,
1442 destination,
1443 target,
1444 unwind,
1445 call_source: _,
1446 fn_span,
1447 } => self.codegen_call_terminator(
1448 helper,
1449 bx,
1450 terminator,
1451 func,
1452 args,
1453 destination,
1454 target,
1455 unwind,
1456 fn_span,
1457 mergeable_succ(),
1458 ),
1459 mir::TerminatorKind::TailCall { .. } => {
1460 span_bug!(
1462 terminator.source_info.span,
1463 "`TailCall` terminator is not yet supported by `rustc_codegen_ssa`"
1464 )
1465 }
1466 mir::TerminatorKind::CoroutineDrop | mir::TerminatorKind::Yield { .. } => {
1467 bug!("coroutine ops in codegen")
1468 }
1469 mir::TerminatorKind::FalseEdge { .. } | mir::TerminatorKind::FalseUnwind { .. } => {
1470 bug!("borrowck false edges in codegen")
1471 }
1472
1473 mir::TerminatorKind::InlineAsm {
1474 asm_macro,
1475 template,
1476 ref operands,
1477 options,
1478 line_spans,
1479 ref targets,
1480 unwind,
1481 } => self.codegen_asm_terminator(
1482 helper,
1483 bx,
1484 asm_macro,
1485 terminator,
1486 template,
1487 operands,
1488 options,
1489 line_spans,
1490 targets,
1491 unwind,
1492 self.instance,
1493 mergeable_succ(),
1494 ),
1495 }
1496 }
1497
1498 fn codegen_argument(
1499 &mut self,
1500 bx: &mut Bx,
1501 op: OperandRef<'tcx, Bx::Value>,
1502 llargs: &mut Vec<Bx::Value>,
1503 arg: &ArgAbi<'tcx, Ty<'tcx>>,
1504 lifetime_ends_after_call: &mut Vec<(Bx::Value, Size)>,
1505 ) {
1506 match arg.mode {
1507 PassMode::Ignore => return,
1508 PassMode::Cast { pad_i32: true, .. } => {
1509 llargs.push(bx.const_undef(bx.reg_backend_type(&Reg::i32())));
1511 }
1512 PassMode::Pair(..) => match op.val {
1513 Pair(a, b) => {
1514 llargs.push(a);
1515 llargs.push(b);
1516 return;
1517 }
1518 _ => bug!("codegen_argument: {:?} invalid for pair argument", op),
1519 },
1520 PassMode::Indirect { attrs: _, meta_attrs: Some(_), on_stack: _ } => match op.val {
1521 Ref(PlaceValue { llval: a, llextra: Some(b), .. }) => {
1522 llargs.push(a);
1523 llargs.push(b);
1524 return;
1525 }
1526 _ => bug!("codegen_argument: {:?} invalid for unsized indirect argument", op),
1527 },
1528 _ => {}
1529 }
1530
1531 let (mut llval, align, by_ref) = match op.val {
1533 Immediate(_) | Pair(..) => match arg.mode {
1534 PassMode::Indirect { attrs, .. } => {
1535 let required_align = match attrs.pointee_align {
1539 Some(pointee_align) => cmp::max(pointee_align, arg.layout.align.abi),
1540 None => arg.layout.align.abi,
1541 };
1542 let scratch = PlaceValue::alloca(bx, arg.layout.size, required_align);
1543 bx.lifetime_start(scratch.llval, arg.layout.size);
1544 op.val.store(bx, scratch.with_type(arg.layout));
1545 lifetime_ends_after_call.push((scratch.llval, arg.layout.size));
1546 (scratch.llval, scratch.align, true)
1547 }
1548 PassMode::Cast { .. } => {
1549 let scratch = PlaceRef::alloca(bx, arg.layout);
1550 op.val.store(bx, scratch);
1551 (scratch.val.llval, scratch.val.align, true)
1552 }
1553 _ => (op.immediate_or_packed_pair(bx), arg.layout.align.abi, false),
1554 },
1555 Ref(op_place_val) => match arg.mode {
1556 PassMode::Indirect { attrs, .. } => {
1557 let required_align = match attrs.pointee_align {
1558 Some(pointee_align) => cmp::max(pointee_align, arg.layout.align.abi),
1559 None => arg.layout.align.abi,
1560 };
1561 if op_place_val.align < required_align {
1562 let scratch = PlaceValue::alloca(bx, arg.layout.size, required_align);
1566 bx.lifetime_start(scratch.llval, arg.layout.size);
1567 bx.typed_place_copy(scratch, op_place_val, op.layout);
1568 lifetime_ends_after_call.push((scratch.llval, arg.layout.size));
1569 (scratch.llval, scratch.align, true)
1570 } else {
1571 (op_place_val.llval, op_place_val.align, true)
1572 }
1573 }
1574 _ => (op_place_val.llval, op_place_val.align, true),
1575 },
1576 ZeroSized => match arg.mode {
1577 PassMode::Indirect { on_stack, .. } => {
1578 if on_stack {
1579 bug!("ZST {op:?} passed on stack with abi {arg:?}");
1582 }
1583 let scratch = PlaceRef::alloca(bx, arg.layout);
1587 (scratch.val.llval, scratch.val.align, true)
1588 }
1589 _ => bug!("ZST {op:?} wasn't ignored, but was passed with abi {arg:?}"),
1590 },
1591 };
1592
1593 if by_ref && !arg.is_indirect() {
1594 if let PassMode::Cast { cast, pad_i32: _ } = &arg.mode {
1596 let scratch_size = cast.size(bx);
1600 let scratch_align = cast.align(bx);
1601 let copy_bytes = cmp::min(cast.unaligned_size(bx).bytes(), arg.layout.size.bytes());
1608 let llscratch = bx.alloca(scratch_size, scratch_align);
1610 bx.lifetime_start(llscratch, scratch_size);
1611 bx.memcpy(
1613 llscratch,
1614 scratch_align,
1615 llval,
1616 align,
1617 bx.const_usize(copy_bytes),
1618 MemFlags::empty(),
1619 );
1620 let cast_ty = bx.cast_backend_type(cast);
1622 llval = bx.load(cast_ty, llscratch, scratch_align);
1623 bx.lifetime_end(llscratch, scratch_size);
1624 } else {
1625 llval = bx.load(bx.backend_type(arg.layout), llval, align);
1631 if let BackendRepr::Scalar(scalar) = arg.layout.backend_repr {
1632 if scalar.is_bool() {
1633 bx.range_metadata(llval, WrappingRange { start: 0, end: 1 });
1634 }
1635 llval = bx.to_immediate_scalar(llval, scalar);
1637 }
1638 }
1639 }
1640
1641 llargs.push(llval);
1642 }
1643
1644 fn codegen_arguments_untupled(
1645 &mut self,
1646 bx: &mut Bx,
1647 operand: &mir::Operand<'tcx>,
1648 llargs: &mut Vec<Bx::Value>,
1649 args: &[ArgAbi<'tcx, Ty<'tcx>>],
1650 lifetime_ends_after_call: &mut Vec<(Bx::Value, Size)>,
1651 ) -> usize {
1652 let tuple = self.codegen_operand(bx, operand);
1653
1654 if let Ref(place_val) = tuple.val {
1656 if place_val.llextra.is_some() {
1657 bug!("closure arguments must be sized");
1658 }
1659 let tuple_ptr = place_val.with_type(tuple.layout);
1660 for i in 0..tuple.layout.fields.count() {
1661 let field_ptr = tuple_ptr.project_field(bx, i);
1662 let field = bx.load_operand(field_ptr);
1663 self.codegen_argument(bx, field, llargs, &args[i], lifetime_ends_after_call);
1664 }
1665 } else {
1666 for i in 0..tuple.layout.fields.count() {
1668 let op = tuple.extract_field(self, bx, i);
1669 self.codegen_argument(bx, op, llargs, &args[i], lifetime_ends_after_call);
1670 }
1671 }
1672 tuple.layout.fields.count()
1673 }
1674
1675 pub(super) fn get_caller_location(
1676 &mut self,
1677 bx: &mut Bx,
1678 source_info: mir::SourceInfo,
1679 ) -> OperandRef<'tcx, Bx::Value> {
1680 self.mir.caller_location_span(source_info, self.caller_location, bx.tcx(), |span: Span| {
1681 let const_loc = bx.tcx().span_as_caller_location(span);
1682 OperandRef::from_const(bx, const_loc, bx.tcx().caller_location_ty())
1683 })
1684 }
1685
1686 fn get_personality_slot(&mut self, bx: &mut Bx) -> PlaceRef<'tcx, Bx::Value> {
1687 let cx = bx.cx();
1688 if let Some(slot) = self.personality_slot {
1689 slot
1690 } else {
1691 let layout = cx.layout_of(Ty::new_tup(
1692 cx.tcx(),
1693 &[Ty::new_mut_ptr(cx.tcx(), cx.tcx().types.u8), cx.tcx().types.i32],
1694 ));
1695 let slot = PlaceRef::alloca(bx, layout);
1696 self.personality_slot = Some(slot);
1697 slot
1698 }
1699 }
1700
1701 fn landing_pad_for(&mut self, bb: mir::BasicBlock) -> Bx::BasicBlock {
1704 if let Some(landing_pad) = self.landing_pads[bb] {
1705 return landing_pad;
1706 }
1707
1708 let landing_pad = self.landing_pad_for_uncached(bb);
1709 self.landing_pads[bb] = Some(landing_pad);
1710 landing_pad
1711 }
1712
1713 fn landing_pad_for_uncached(&mut self, bb: mir::BasicBlock) -> Bx::BasicBlock {
1715 let llbb = self.llbb(bb);
1716 if base::wants_new_eh_instructions(self.cx.sess()) {
1717 let cleanup_bb = Bx::append_block(self.cx, self.llfn, &format!("funclet_{bb:?}"));
1718 let mut cleanup_bx = Bx::build(self.cx, cleanup_bb);
1719 let funclet = cleanup_bx.cleanup_pad(None, &[]);
1720 cleanup_bx.br(llbb);
1721 self.funclets[bb] = Some(funclet);
1722 cleanup_bb
1723 } else {
1724 let cleanup_llbb = Bx::append_block(self.cx, self.llfn, "cleanup");
1725 let mut cleanup_bx = Bx::build(self.cx, cleanup_llbb);
1726
1727 let llpersonality = self.cx.eh_personality();
1728 let (exn0, exn1) = cleanup_bx.cleanup_landing_pad(llpersonality);
1729
1730 let slot = self.get_personality_slot(&mut cleanup_bx);
1731 slot.storage_live(&mut cleanup_bx);
1732 Pair(exn0, exn1).store(&mut cleanup_bx, slot);
1733
1734 cleanup_bx.br(llbb);
1735 cleanup_llbb
1736 }
1737 }
1738
1739 fn unreachable_block(&mut self) -> Bx::BasicBlock {
1740 self.unreachable_block.unwrap_or_else(|| {
1741 let llbb = Bx::append_block(self.cx, self.llfn, "unreachable");
1742 let mut bx = Bx::build(self.cx, llbb);
1743 bx.unreachable();
1744 self.unreachable_block = Some(llbb);
1745 llbb
1746 })
1747 }
1748
1749 fn terminate_block(&mut self, reason: UnwindTerminateReason) -> Bx::BasicBlock {
1750 if let Some((cached_bb, cached_reason)) = self.terminate_block
1751 && reason == cached_reason
1752 {
1753 return cached_bb;
1754 }
1755
1756 let funclet;
1757 let llbb;
1758 let mut bx;
1759 if base::wants_new_eh_instructions(self.cx.sess()) {
1760 llbb = Bx::append_block(self.cx, self.llfn, "cs_terminate");
1790 let cp_llbb = Bx::append_block(self.cx, self.llfn, "cp_terminate");
1791
1792 let mut cs_bx = Bx::build(self.cx, llbb);
1793 let cs = cs_bx.catch_switch(None, None, &[cp_llbb]);
1794
1795 bx = Bx::build(self.cx, cp_llbb);
1796 let null =
1797 bx.const_null(bx.type_ptr_ext(bx.cx().data_layout().instruction_address_space));
1798
1799 let args = if base::wants_msvc_seh(self.cx.sess()) {
1803 let adjectives = bx.const_i32(0x40);
1810 &[null, adjectives, null] as &[_]
1811 } else {
1812 &[null] as &[_]
1818 };
1819
1820 funclet = Some(bx.catch_pad(cs, args));
1821 } else {
1822 llbb = Bx::append_block(self.cx, self.llfn, "terminate");
1823 bx = Bx::build(self.cx, llbb);
1824
1825 let llpersonality = self.cx.eh_personality();
1826 bx.filter_landing_pad(llpersonality);
1827
1828 funclet = None;
1829 }
1830
1831 self.set_debug_loc(&mut bx, mir::SourceInfo::outermost(self.mir.span));
1832
1833 let (fn_abi, fn_ptr, instance) =
1834 common::build_langcall(&bx, self.mir.span, reason.lang_item());
1835 if is_call_from_compiler_builtins_to_upstream_monomorphization(bx.tcx(), instance) {
1836 bx.abort();
1837 } else {
1838 let fn_ty = bx.fn_decl_backend_type(fn_abi);
1839
1840 let llret = bx.call(fn_ty, None, Some(fn_abi), fn_ptr, &[], funclet.as_ref(), None);
1841 bx.apply_attrs_to_cleanup_callsite(llret);
1842 }
1843
1844 bx.unreachable();
1845
1846 self.terminate_block = Some((llbb, reason));
1847 llbb
1848 }
1849
1850 pub fn llbb(&mut self, bb: mir::BasicBlock) -> Bx::BasicBlock {
1855 self.try_llbb(bb).unwrap()
1856 }
1857
1858 pub(crate) fn try_llbb(&mut self, bb: mir::BasicBlock) -> Option<Bx::BasicBlock> {
1860 match self.cached_llbbs[bb] {
1861 CachedLlbb::None => {
1862 let llbb = Bx::append_block(self.cx, self.llfn, &format!("{bb:?}"));
1863 self.cached_llbbs[bb] = CachedLlbb::Some(llbb);
1864 Some(llbb)
1865 }
1866 CachedLlbb::Some(llbb) => Some(llbb),
1867 CachedLlbb::Skip => None,
1868 }
1869 }
1870
1871 fn make_return_dest(
1872 &mut self,
1873 bx: &mut Bx,
1874 dest: mir::Place<'tcx>,
1875 fn_ret: &ArgAbi<'tcx, Ty<'tcx>>,
1876 llargs: &mut Vec<Bx::Value>,
1877 ) -> ReturnDest<'tcx, Bx::Value> {
1878 if fn_ret.is_ignore() {
1880 return ReturnDest::Nothing;
1881 }
1882 let dest = if let Some(index) = dest.as_local() {
1883 match self.locals[index] {
1884 LocalRef::Place(dest) => dest,
1885 LocalRef::UnsizedPlace(_) => bug!("return type must be sized"),
1886 LocalRef::PendingOperand => {
1887 return if fn_ret.is_indirect() {
1890 let tmp = PlaceRef::alloca(bx, fn_ret.layout);
1893 tmp.storage_live(bx);
1894 llargs.push(tmp.val.llval);
1895 ReturnDest::IndirectOperand(tmp, index)
1896 } else {
1897 ReturnDest::DirectOperand(index)
1898 };
1899 }
1900 LocalRef::Operand(_) => {
1901 bug!("place local already assigned to");
1902 }
1903 }
1904 } else {
1905 self.codegen_place(bx, dest.as_ref())
1906 };
1907 if fn_ret.is_indirect() {
1908 if dest.val.align < dest.layout.align.abi {
1909 span_bug!(self.mir.span, "can't directly store to unaligned value");
1916 }
1917 llargs.push(dest.val.llval);
1918 ReturnDest::Nothing
1919 } else {
1920 ReturnDest::Store(dest)
1921 }
1922 }
1923
1924 fn store_return(
1926 &mut self,
1927 bx: &mut Bx,
1928 dest: ReturnDest<'tcx, Bx::Value>,
1929 ret_abi: &ArgAbi<'tcx, Ty<'tcx>>,
1930 llval: Bx::Value,
1931 ) {
1932 use self::ReturnDest::*;
1933
1934 match dest {
1935 Nothing => (),
1936 Store(dst) => bx.store_arg(ret_abi, llval, dst),
1937 IndirectOperand(tmp, index) => {
1938 let op = bx.load_operand(tmp);
1939 tmp.storage_dead(bx);
1940 self.overwrite_local(index, LocalRef::Operand(op));
1941 self.debug_introduce_local(bx, index);
1942 }
1943 DirectOperand(index) => {
1944 let op = if let PassMode::Cast { .. } = ret_abi.mode {
1946 let tmp = PlaceRef::alloca(bx, ret_abi.layout);
1947 tmp.storage_live(bx);
1948 bx.store_arg(ret_abi, llval, tmp);
1949 let op = bx.load_operand(tmp);
1950 tmp.storage_dead(bx);
1951 op
1952 } else {
1953 OperandRef::from_immediate_or_packed_pair(bx, llval, ret_abi.layout)
1954 };
1955 self.overwrite_local(index, LocalRef::Operand(op));
1956 self.debug_introduce_local(bx, index);
1957 }
1958 }
1959 }
1960}
1961
1962enum ReturnDest<'tcx, V> {
1963 Nothing,
1965 Store(PlaceRef<'tcx, V>),
1967 IndirectOperand(PlaceRef<'tcx, V>, mir::Local),
1969 DirectOperand(mir::Local),
1971}