1use std::cmp;
2
3use rustc_abi::{Align, 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, CastTarget, 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 load_cast(bx, cast_ty, llslot, self.fn_abi.ret.layout.align.abi)
562 }
563 };
564 bx.ret(llval);
565 }
566
567 #[tracing::instrument(level = "trace", skip(self, helper, bx))]
568 fn codegen_drop_terminator(
569 &mut self,
570 helper: TerminatorCodegenHelper<'tcx>,
571 bx: &mut Bx,
572 source_info: &mir::SourceInfo,
573 location: mir::Place<'tcx>,
574 target: mir::BasicBlock,
575 unwind: mir::UnwindAction,
576 mergeable_succ: bool,
577 ) -> MergingSucc {
578 let ty = location.ty(self.mir, bx.tcx()).ty;
579 let ty = self.monomorphize(ty);
580 let drop_fn = Instance::resolve_drop_in_place(bx.tcx(), ty);
581
582 if let ty::InstanceKind::DropGlue(_, None) = drop_fn.def {
583 return helper.funclet_br(self, bx, target, mergeable_succ);
585 }
586
587 let place = self.codegen_place(bx, location.as_ref());
588 let (args1, args2);
589 let mut args = if let Some(llextra) = place.val.llextra {
590 args2 = [place.val.llval, llextra];
591 &args2[..]
592 } else {
593 args1 = [place.val.llval];
594 &args1[..]
595 };
596 let (maybe_null, drop_fn, fn_abi, drop_instance) = match ty.kind() {
597 ty::Dynamic(_, _, ty::Dyn) => {
600 let virtual_drop = Instance {
613 def: ty::InstanceKind::Virtual(drop_fn.def_id(), 0), args: drop_fn.args,
615 };
616 debug!("ty = {:?}", ty);
617 debug!("drop_fn = {:?}", drop_fn);
618 debug!("args = {:?}", args);
619 let fn_abi = bx.fn_abi_of_instance(virtual_drop, ty::List::empty());
620 let vtable = args[1];
621 args = &args[..1];
623 (
624 true,
625 meth::VirtualIndex::from_index(ty::COMMON_VTABLE_ENTRIES_DROPINPLACE)
626 .get_optional_fn(bx, vtable, ty, fn_abi),
627 fn_abi,
628 virtual_drop,
629 )
630 }
631 _ => (
632 false,
633 bx.get_fn_addr(drop_fn),
634 bx.fn_abi_of_instance(drop_fn, ty::List::empty()),
635 drop_fn,
636 ),
637 };
638
639 if maybe_null {
642 let is_not_null = bx.append_sibling_block("is_not_null");
643 let llty = bx.fn_ptr_backend_type(fn_abi);
644 let null = bx.const_null(llty);
645 let non_null =
646 bx.icmp(base::bin_op_to_icmp_predicate(mir::BinOp::Ne, false), drop_fn, null);
647 bx.cond_br(non_null, is_not_null, helper.llbb_with_cleanup(self, target));
648 bx.switch_to_block(is_not_null);
649 self.set_debug_loc(bx, *source_info);
650 }
651
652 helper.do_call(
653 self,
654 bx,
655 fn_abi,
656 drop_fn,
657 args,
658 Some((ReturnDest::Nothing, target)),
659 unwind,
660 &[],
661 Some(drop_instance),
662 !maybe_null && mergeable_succ,
663 )
664 }
665
666 fn codegen_assert_terminator(
667 &mut self,
668 helper: TerminatorCodegenHelper<'tcx>,
669 bx: &mut Bx,
670 terminator: &mir::Terminator<'tcx>,
671 cond: &mir::Operand<'tcx>,
672 expected: bool,
673 msg: &mir::AssertMessage<'tcx>,
674 target: mir::BasicBlock,
675 unwind: mir::UnwindAction,
676 mergeable_succ: bool,
677 ) -> MergingSucc {
678 let span = terminator.source_info.span;
679 let cond = self.codegen_operand(bx, cond).immediate();
680 let mut const_cond = bx.const_to_opt_u128(cond, false).map(|c| c == 1);
681
682 if !bx.sess().overflow_checks() && msg.is_optional_overflow_check() {
687 const_cond = Some(expected);
688 }
689
690 if const_cond == Some(expected) {
692 return helper.funclet_br(self, bx, target, mergeable_succ);
693 }
694
695 let lltarget = helper.llbb_with_cleanup(self, target);
700 let panic_block = bx.append_sibling_block("panic");
701 if expected {
702 bx.cond_br(cond, lltarget, panic_block);
703 } else {
704 bx.cond_br(cond, panic_block, lltarget);
705 }
706
707 bx.switch_to_block(panic_block);
709 self.set_debug_loc(bx, terminator.source_info);
710
711 let location = self.get_caller_location(bx, terminator.source_info).immediate();
713
714 let (lang_item, args) = match msg {
716 AssertKind::BoundsCheck { len, index } => {
717 let len = self.codegen_operand(bx, len).immediate();
718 let index = self.codegen_operand(bx, index).immediate();
719 (LangItem::PanicBoundsCheck, vec![index, len, location])
722 }
723 AssertKind::MisalignedPointerDereference { required, found } => {
724 let required = self.codegen_operand(bx, required).immediate();
725 let found = self.codegen_operand(bx, found).immediate();
726 (LangItem::PanicMisalignedPointerDereference, vec![required, found, location])
729 }
730 AssertKind::NullPointerDereference => {
731 (LangItem::PanicNullPointerDereference, vec![location])
734 }
735 AssertKind::InvalidEnumConstruction(source) => {
736 let source = self.codegen_operand(bx, source).immediate();
737 (LangItem::PanicInvalidEnumConstruction, vec![source, location])
740 }
741 _ => {
742 (msg.panic_function(), vec![location])
744 }
745 };
746
747 let (fn_abi, llfn, instance) = common::build_langcall(bx, span, lang_item);
748
749 let merging_succ =
751 helper.do_call(self, bx, fn_abi, llfn, &args, None, unwind, &[], Some(instance), false);
752 assert_eq!(merging_succ, MergingSucc::False);
753 MergingSucc::False
754 }
755
756 fn codegen_terminate_terminator(
757 &mut self,
758 helper: TerminatorCodegenHelper<'tcx>,
759 bx: &mut Bx,
760 terminator: &mir::Terminator<'tcx>,
761 reason: UnwindTerminateReason,
762 ) {
763 let span = terminator.source_info.span;
764 self.set_debug_loc(bx, terminator.source_info);
765
766 let (fn_abi, llfn, instance) = common::build_langcall(bx, span, reason.lang_item());
768
769 let merging_succ = helper.do_call(
771 self,
772 bx,
773 fn_abi,
774 llfn,
775 &[],
776 None,
777 mir::UnwindAction::Unreachable,
778 &[],
779 Some(instance),
780 false,
781 );
782 assert_eq!(merging_succ, MergingSucc::False);
783 }
784
785 fn codegen_panic_intrinsic(
787 &mut self,
788 helper: &TerminatorCodegenHelper<'tcx>,
789 bx: &mut Bx,
790 intrinsic: ty::IntrinsicDef,
791 instance: Instance<'tcx>,
792 source_info: mir::SourceInfo,
793 target: Option<mir::BasicBlock>,
794 unwind: mir::UnwindAction,
795 mergeable_succ: bool,
796 ) -> Option<MergingSucc> {
797 let Some(requirement) = ValidityRequirement::from_intrinsic(intrinsic.name) else {
801 return None;
802 };
803
804 let ty = instance.args.type_at(0);
805
806 let is_valid = bx
807 .tcx()
808 .check_validity_requirement((requirement, bx.typing_env().as_query_input(ty)))
809 .expect("expect to have layout during codegen");
810
811 if is_valid {
812 let target = target.unwrap();
814 return Some(helper.funclet_br(self, bx, target, mergeable_succ));
815 }
816
817 let layout = bx.layout_of(ty);
818
819 let msg_str = with_no_visible_paths!({
820 with_no_trimmed_paths!({
821 if layout.is_uninhabited() {
822 format!("attempted to instantiate uninhabited type `{ty}`")
824 } else if requirement == ValidityRequirement::Zero {
825 format!("attempted to zero-initialize type `{ty}`, which is invalid")
826 } else {
827 format!("attempted to leave type `{ty}` uninitialized, which is invalid")
828 }
829 })
830 });
831 let msg = bx.const_str(&msg_str);
832
833 let (fn_abi, llfn, instance) =
835 common::build_langcall(bx, source_info.span, LangItem::PanicNounwind);
836
837 Some(helper.do_call(
839 self,
840 bx,
841 fn_abi,
842 llfn,
843 &[msg.0, msg.1],
844 target.as_ref().map(|bb| (ReturnDest::Nothing, *bb)),
845 unwind,
846 &[],
847 Some(instance),
848 mergeable_succ,
849 ))
850 }
851
852 fn codegen_call_terminator(
853 &mut self,
854 helper: TerminatorCodegenHelper<'tcx>,
855 bx: &mut Bx,
856 terminator: &mir::Terminator<'tcx>,
857 func: &mir::Operand<'tcx>,
858 args: &[Spanned<mir::Operand<'tcx>>],
859 destination: mir::Place<'tcx>,
860 target: Option<mir::BasicBlock>,
861 unwind: mir::UnwindAction,
862 fn_span: Span,
863 mergeable_succ: bool,
864 ) -> MergingSucc {
865 let source_info = mir::SourceInfo { span: fn_span, ..terminator.source_info };
866
867 let callee = self.codegen_operand(bx, func);
869
870 let (instance, mut llfn) = match *callee.layout.ty.kind() {
871 ty::FnDef(def_id, generic_args) => {
872 let instance = ty::Instance::expect_resolve(
873 bx.tcx(),
874 bx.typing_env(),
875 def_id,
876 generic_args,
877 fn_span,
878 );
879
880 let instance = match instance.def {
881 ty::InstanceKind::DropGlue(_, None) => {
884 let target = target.unwrap();
886 return helper.funclet_br(self, bx, target, mergeable_succ);
887 }
888 ty::InstanceKind::Intrinsic(def_id) => {
889 let intrinsic = bx.tcx().intrinsic(def_id).unwrap();
890 if let Some(merging_succ) = self.codegen_panic_intrinsic(
891 &helper,
892 bx,
893 intrinsic,
894 instance,
895 source_info,
896 target,
897 unwind,
898 mergeable_succ,
899 ) {
900 return merging_succ;
901 }
902
903 let result_layout =
904 self.cx.layout_of(self.monomorphized_place_ty(destination.as_ref()));
905
906 let (result, store_in_local) = if result_layout.is_zst() {
907 (
908 PlaceRef::new_sized(bx.const_undef(bx.type_ptr()), result_layout),
909 None,
910 )
911 } else if let Some(local) = destination.as_local() {
912 match self.locals[local] {
913 LocalRef::Place(dest) => (dest, None),
914 LocalRef::UnsizedPlace(_) => bug!("return type must be sized"),
915 LocalRef::PendingOperand => {
916 let tmp = PlaceRef::alloca(bx, result_layout);
920 tmp.storage_live(bx);
921 (tmp, Some(local))
922 }
923 LocalRef::Operand(_) => {
924 bug!("place local already assigned to");
925 }
926 }
927 } else {
928 (self.codegen_place(bx, destination.as_ref()), None)
929 };
930
931 if result.val.align < result.layout.align.abi {
932 span_bug!(self.mir.span, "can't directly store to unaligned value");
939 }
940
941 let args: Vec<_> =
942 args.iter().map(|arg| self.codegen_operand(bx, &arg.node)).collect();
943
944 match self.codegen_intrinsic_call(bx, instance, &args, result, source_info)
945 {
946 Ok(()) => {
947 if let Some(local) = store_in_local {
948 let op = bx.load_operand(result);
949 result.storage_dead(bx);
950 self.overwrite_local(local, LocalRef::Operand(op));
951 self.debug_introduce_local(bx, local);
952 }
953
954 return if let Some(target) = target {
955 helper.funclet_br(self, bx, target, mergeable_succ)
956 } else {
957 bx.unreachable();
958 MergingSucc::False
959 };
960 }
961 Err(instance) => {
962 if intrinsic.must_be_overridden {
963 span_bug!(
964 fn_span,
965 "intrinsic {} must be overridden by codegen backend, but isn't",
966 intrinsic.name,
967 );
968 }
969 instance
970 }
971 }
972 }
973 _ => instance,
974 };
975
976 (Some(instance), None)
977 }
978 ty::FnPtr(..) => (None, Some(callee.immediate())),
979 _ => bug!("{} is not callable", callee.layout.ty),
980 };
981
982 let sig = callee.layout.ty.fn_sig(bx.tcx());
986
987 let extra_args = &args[sig.inputs().skip_binder().len()..];
988 let extra_args = bx.tcx().mk_type_list_from_iter(extra_args.iter().map(|op_arg| {
989 let op_ty = op_arg.node.ty(self.mir, bx.tcx());
990 self.monomorphize(op_ty)
991 }));
992
993 let fn_abi = match instance {
994 Some(instance) => bx.fn_abi_of_instance(instance, extra_args),
995 None => bx.fn_abi_of_fn_ptr(sig, extra_args),
996 };
997
998 let arg_count = fn_abi.args.len() + fn_abi.ret.is_indirect() as usize;
1000
1001 let mut llargs = Vec::with_capacity(arg_count);
1002
1003 let return_dest = self.make_return_dest(bx, destination, &fn_abi.ret, &mut llargs);
1007 let destination = target.map(|target| (return_dest, target));
1008
1009 let (first_args, untuple) = if sig.abi() == ExternAbi::RustCall
1011 && let Some((tup, args)) = args.split_last()
1012 {
1013 (args, Some(tup))
1014 } else {
1015 (args, None)
1016 };
1017
1018 let mut lifetime_ends_after_call: Vec<(Bx::Value, Size)> = Vec::new();
1022 'make_args: for (i, arg) in first_args.iter().enumerate() {
1023 let mut op = self.codegen_operand(bx, &arg.node);
1024
1025 if let (0, Some(ty::InstanceKind::Virtual(_, idx))) = (i, instance.map(|i| i.def)) {
1026 match op.val {
1027 Pair(data_ptr, meta) => {
1028 while !op.layout.ty.is_raw_ptr() && !op.layout.ty.is_ref() {
1038 let (idx, _) = op.layout.non_1zst_field(bx).expect(
1039 "not exactly one non-1-ZST field in a `DispatchFromDyn` type",
1040 );
1041 op = op.extract_field(self, bx, idx.as_usize());
1042 }
1043
1044 llfn = Some(meth::VirtualIndex::from_index(idx).get_fn(
1048 bx,
1049 meta,
1050 op.layout.ty,
1051 fn_abi,
1052 ));
1053 llargs.push(data_ptr);
1054 continue 'make_args;
1055 }
1056 Ref(PlaceValue { llval: data_ptr, llextra: Some(meta), .. }) => {
1057 llfn = Some(meth::VirtualIndex::from_index(idx).get_fn(
1059 bx,
1060 meta,
1061 op.layout.ty,
1062 fn_abi,
1063 ));
1064 llargs.push(data_ptr);
1065 continue;
1066 }
1067 _ => {
1068 span_bug!(fn_span, "can't codegen a virtual call on {:#?}", op);
1069 }
1070 }
1071 }
1072
1073 match (&arg.node, op.val) {
1076 (&mir::Operand::Copy(_), Ref(PlaceValue { llextra: None, .. }))
1077 | (&mir::Operand::Constant(_), Ref(PlaceValue { llextra: None, .. })) => {
1078 let tmp = PlaceRef::alloca(bx, op.layout);
1079 bx.lifetime_start(tmp.val.llval, tmp.layout.size);
1080 op.val.store(bx, tmp);
1081 op.val = Ref(tmp.val);
1082 lifetime_ends_after_call.push((tmp.val.llval, tmp.layout.size));
1083 }
1084 _ => {}
1085 }
1086
1087 self.codegen_argument(
1088 bx,
1089 op,
1090 &mut llargs,
1091 &fn_abi.args[i],
1092 &mut lifetime_ends_after_call,
1093 );
1094 }
1095 let num_untupled = untuple.map(|tup| {
1096 self.codegen_arguments_untupled(
1097 bx,
1098 &tup.node,
1099 &mut llargs,
1100 &fn_abi.args[first_args.len()..],
1101 &mut lifetime_ends_after_call,
1102 )
1103 });
1104
1105 let needs_location =
1106 instance.is_some_and(|i| i.def.requires_caller_location(self.cx.tcx()));
1107 if needs_location {
1108 let mir_args = if let Some(num_untupled) = num_untupled {
1109 first_args.len() + num_untupled
1110 } else {
1111 args.len()
1112 };
1113 assert_eq!(
1114 fn_abi.args.len(),
1115 mir_args + 1,
1116 "#[track_caller] fn's must have 1 more argument in their ABI than in their MIR: {instance:?} {fn_span:?} {fn_abi:?}",
1117 );
1118 let location = self.get_caller_location(bx, source_info);
1119 debug!(
1120 "codegen_call_terminator({:?}): location={:?} (fn_span {:?})",
1121 terminator, location, fn_span
1122 );
1123
1124 let last_arg = fn_abi.args.last().unwrap();
1125 self.codegen_argument(
1126 bx,
1127 location,
1128 &mut llargs,
1129 last_arg,
1130 &mut lifetime_ends_after_call,
1131 );
1132 }
1133
1134 let fn_ptr = match (instance, llfn) {
1135 (Some(instance), None) => bx.get_fn_addr(instance),
1136 (_, Some(llfn)) => llfn,
1137 _ => span_bug!(fn_span, "no instance or llfn for call"),
1138 };
1139 self.set_debug_loc(bx, source_info);
1140 helper.do_call(
1141 self,
1142 bx,
1143 fn_abi,
1144 fn_ptr,
1145 &llargs,
1146 destination,
1147 unwind,
1148 &lifetime_ends_after_call,
1149 instance,
1150 mergeable_succ,
1151 )
1152 }
1153
1154 fn codegen_asm_terminator(
1155 &mut self,
1156 helper: TerminatorCodegenHelper<'tcx>,
1157 bx: &mut Bx,
1158 asm_macro: InlineAsmMacro,
1159 terminator: &mir::Terminator<'tcx>,
1160 template: &[ast::InlineAsmTemplatePiece],
1161 operands: &[mir::InlineAsmOperand<'tcx>],
1162 options: ast::InlineAsmOptions,
1163 line_spans: &[Span],
1164 targets: &[mir::BasicBlock],
1165 unwind: mir::UnwindAction,
1166 instance: Instance<'_>,
1167 mergeable_succ: bool,
1168 ) -> MergingSucc {
1169 let span = terminator.source_info.span;
1170
1171 let operands: Vec<_> = operands
1172 .iter()
1173 .map(|op| match *op {
1174 mir::InlineAsmOperand::In { reg, ref value } => {
1175 let value = self.codegen_operand(bx, value);
1176 InlineAsmOperandRef::In { reg, value }
1177 }
1178 mir::InlineAsmOperand::Out { reg, late, ref place } => {
1179 let place = place.map(|place| self.codegen_place(bx, place.as_ref()));
1180 InlineAsmOperandRef::Out { reg, late, place }
1181 }
1182 mir::InlineAsmOperand::InOut { reg, late, ref in_value, ref out_place } => {
1183 let in_value = self.codegen_operand(bx, in_value);
1184 let out_place =
1185 out_place.map(|out_place| self.codegen_place(bx, out_place.as_ref()));
1186 InlineAsmOperandRef::InOut { reg, late, in_value, out_place }
1187 }
1188 mir::InlineAsmOperand::Const { ref value } => {
1189 let const_value = self.eval_mir_constant(value);
1190 let string = common::asm_const_to_str(
1191 bx.tcx(),
1192 span,
1193 const_value,
1194 bx.layout_of(value.ty()),
1195 );
1196 InlineAsmOperandRef::Const { string }
1197 }
1198 mir::InlineAsmOperand::SymFn { ref value } => {
1199 let const_ = self.monomorphize(value.const_);
1200 if let ty::FnDef(def_id, args) = *const_.ty().kind() {
1201 let instance = ty::Instance::resolve_for_fn_ptr(
1202 bx.tcx(),
1203 bx.typing_env(),
1204 def_id,
1205 args,
1206 )
1207 .unwrap();
1208 InlineAsmOperandRef::SymFn { instance }
1209 } else {
1210 span_bug!(span, "invalid type for asm sym (fn)");
1211 }
1212 }
1213 mir::InlineAsmOperand::SymStatic { def_id } => {
1214 InlineAsmOperandRef::SymStatic { def_id }
1215 }
1216 mir::InlineAsmOperand::Label { target_index } => {
1217 InlineAsmOperandRef::Label { label: self.llbb(targets[target_index]) }
1218 }
1219 })
1220 .collect();
1221
1222 helper.do_inlineasm(
1223 self,
1224 bx,
1225 template,
1226 &operands,
1227 options,
1228 line_spans,
1229 if asm_macro.diverges(options) { None } else { targets.get(0).copied() },
1230 unwind,
1231 instance,
1232 mergeable_succ,
1233 )
1234 }
1235
1236 pub(crate) fn codegen_block(&mut self, mut bb: mir::BasicBlock) {
1237 let llbb = match self.try_llbb(bb) {
1238 Some(llbb) => llbb,
1239 None => return,
1240 };
1241 let bx = &mut Bx::build(self.cx, llbb);
1242 let mir = self.mir;
1243
1244 loop {
1248 let data = &mir[bb];
1249
1250 debug!("codegen_block({:?}={:?})", bb, data);
1251
1252 for statement in &data.statements {
1253 self.codegen_statement(bx, statement);
1254 }
1255
1256 let merging_succ = self.codegen_terminator(bx, bb, data.terminator());
1257 if let MergingSucc::False = merging_succ {
1258 break;
1259 }
1260
1261 let mut successors = data.terminator().successors();
1269 let succ = successors.next().unwrap();
1270 assert!(matches!(self.cached_llbbs[succ], CachedLlbb::None));
1271 self.cached_llbbs[succ] = CachedLlbb::Skip;
1272 bb = succ;
1273 }
1274 }
1275
1276 pub(crate) fn codegen_block_as_unreachable(&mut self, bb: mir::BasicBlock) {
1277 let llbb = match self.try_llbb(bb) {
1278 Some(llbb) => llbb,
1279 None => return,
1280 };
1281 let bx = &mut Bx::build(self.cx, llbb);
1282 debug!("codegen_block_as_unreachable({:?})", bb);
1283 bx.unreachable();
1284 }
1285
1286 fn codegen_terminator(
1287 &mut self,
1288 bx: &mut Bx,
1289 bb: mir::BasicBlock,
1290 terminator: &'tcx mir::Terminator<'tcx>,
1291 ) -> MergingSucc {
1292 debug!("codegen_terminator: {:?}", terminator);
1293
1294 let helper = TerminatorCodegenHelper { bb, terminator };
1295
1296 let mergeable_succ = || {
1297 let mut successors = terminator.successors();
1300 if let Some(succ) = successors.next()
1301 && successors.next().is_none()
1302 && let &[succ_pred] = self.mir.basic_blocks.predecessors()[succ].as_slice()
1303 {
1304 assert_eq!(succ_pred, bb);
1307 true
1308 } else {
1309 false
1310 }
1311 };
1312
1313 self.set_debug_loc(bx, terminator.source_info);
1314 match terminator.kind {
1315 mir::TerminatorKind::UnwindResume => {
1316 self.codegen_resume_terminator(helper, bx);
1317 MergingSucc::False
1318 }
1319
1320 mir::TerminatorKind::UnwindTerminate(reason) => {
1321 self.codegen_terminate_terminator(helper, bx, terminator, reason);
1322 MergingSucc::False
1323 }
1324
1325 mir::TerminatorKind::Goto { target } => {
1326 helper.funclet_br(self, bx, target, mergeable_succ())
1327 }
1328
1329 mir::TerminatorKind::SwitchInt { ref discr, ref targets } => {
1330 self.codegen_switchint_terminator(helper, bx, discr, targets);
1331 MergingSucc::False
1332 }
1333
1334 mir::TerminatorKind::Return => {
1335 self.codegen_return_terminator(bx);
1336 MergingSucc::False
1337 }
1338
1339 mir::TerminatorKind::Unreachable => {
1340 bx.unreachable();
1341 MergingSucc::False
1342 }
1343
1344 mir::TerminatorKind::Drop { place, target, unwind, replace: _, drop, async_fut } => {
1345 assert!(
1346 async_fut.is_none() && drop.is_none(),
1347 "Async Drop must be expanded or reset to sync before codegen"
1348 );
1349 self.codegen_drop_terminator(
1350 helper,
1351 bx,
1352 &terminator.source_info,
1353 place,
1354 target,
1355 unwind,
1356 mergeable_succ(),
1357 )
1358 }
1359
1360 mir::TerminatorKind::Assert { ref cond, expected, ref msg, target, unwind } => self
1361 .codegen_assert_terminator(
1362 helper,
1363 bx,
1364 terminator,
1365 cond,
1366 expected,
1367 msg,
1368 target,
1369 unwind,
1370 mergeable_succ(),
1371 ),
1372
1373 mir::TerminatorKind::Call {
1374 ref func,
1375 ref args,
1376 destination,
1377 target,
1378 unwind,
1379 call_source: _,
1380 fn_span,
1381 } => self.codegen_call_terminator(
1382 helper,
1383 bx,
1384 terminator,
1385 func,
1386 args,
1387 destination,
1388 target,
1389 unwind,
1390 fn_span,
1391 mergeable_succ(),
1392 ),
1393 mir::TerminatorKind::TailCall { .. } => {
1394 span_bug!(
1396 terminator.source_info.span,
1397 "`TailCall` terminator is not yet supported by `rustc_codegen_ssa`"
1398 )
1399 }
1400 mir::TerminatorKind::CoroutineDrop | mir::TerminatorKind::Yield { .. } => {
1401 bug!("coroutine ops in codegen")
1402 }
1403 mir::TerminatorKind::FalseEdge { .. } | mir::TerminatorKind::FalseUnwind { .. } => {
1404 bug!("borrowck false edges in codegen")
1405 }
1406
1407 mir::TerminatorKind::InlineAsm {
1408 asm_macro,
1409 template,
1410 ref operands,
1411 options,
1412 line_spans,
1413 ref targets,
1414 unwind,
1415 } => self.codegen_asm_terminator(
1416 helper,
1417 bx,
1418 asm_macro,
1419 terminator,
1420 template,
1421 operands,
1422 options,
1423 line_spans,
1424 targets,
1425 unwind,
1426 self.instance,
1427 mergeable_succ(),
1428 ),
1429 }
1430 }
1431
1432 fn codegen_argument(
1433 &mut self,
1434 bx: &mut Bx,
1435 op: OperandRef<'tcx, Bx::Value>,
1436 llargs: &mut Vec<Bx::Value>,
1437 arg: &ArgAbi<'tcx, Ty<'tcx>>,
1438 lifetime_ends_after_call: &mut Vec<(Bx::Value, Size)>,
1439 ) {
1440 match arg.mode {
1441 PassMode::Ignore => return,
1442 PassMode::Cast { pad_i32: true, .. } => {
1443 llargs.push(bx.const_undef(bx.reg_backend_type(&Reg::i32())));
1445 }
1446 PassMode::Pair(..) => match op.val {
1447 Pair(a, b) => {
1448 llargs.push(a);
1449 llargs.push(b);
1450 return;
1451 }
1452 _ => bug!("codegen_argument: {:?} invalid for pair argument", op),
1453 },
1454 PassMode::Indirect { attrs: _, meta_attrs: Some(_), on_stack: _ } => match op.val {
1455 Ref(PlaceValue { llval: a, llextra: Some(b), .. }) => {
1456 llargs.push(a);
1457 llargs.push(b);
1458 return;
1459 }
1460 _ => bug!("codegen_argument: {:?} invalid for unsized indirect argument", op),
1461 },
1462 _ => {}
1463 }
1464
1465 let (mut llval, align, by_ref) = match op.val {
1467 Immediate(_) | Pair(..) => match arg.mode {
1468 PassMode::Indirect { attrs, .. } => {
1469 let required_align = match attrs.pointee_align {
1473 Some(pointee_align) => cmp::max(pointee_align, arg.layout.align.abi),
1474 None => arg.layout.align.abi,
1475 };
1476 let scratch = PlaceValue::alloca(bx, arg.layout.size, required_align);
1477 bx.lifetime_start(scratch.llval, arg.layout.size);
1478 op.val.store(bx, scratch.with_type(arg.layout));
1479 lifetime_ends_after_call.push((scratch.llval, arg.layout.size));
1480 (scratch.llval, scratch.align, true)
1481 }
1482 PassMode::Cast { .. } => {
1483 let scratch = PlaceRef::alloca(bx, arg.layout);
1484 op.val.store(bx, scratch);
1485 (scratch.val.llval, scratch.val.align, true)
1486 }
1487 _ => (op.immediate_or_packed_pair(bx), arg.layout.align.abi, false),
1488 },
1489 Ref(op_place_val) => match arg.mode {
1490 PassMode::Indirect { attrs, .. } => {
1491 let required_align = match attrs.pointee_align {
1492 Some(pointee_align) => cmp::max(pointee_align, arg.layout.align.abi),
1493 None => arg.layout.align.abi,
1494 };
1495 if op_place_val.align < required_align {
1496 let scratch = PlaceValue::alloca(bx, arg.layout.size, required_align);
1500 bx.lifetime_start(scratch.llval, arg.layout.size);
1501 bx.typed_place_copy(scratch, op_place_val, op.layout);
1502 lifetime_ends_after_call.push((scratch.llval, arg.layout.size));
1503 (scratch.llval, scratch.align, true)
1504 } else {
1505 (op_place_val.llval, op_place_val.align, true)
1506 }
1507 }
1508 _ => (op_place_val.llval, op_place_val.align, true),
1509 },
1510 ZeroSized => match arg.mode {
1511 PassMode::Indirect { on_stack, .. } => {
1512 if on_stack {
1513 bug!("ZST {op:?} passed on stack with abi {arg:?}");
1516 }
1517 let scratch = PlaceRef::alloca(bx, arg.layout);
1521 (scratch.val.llval, scratch.val.align, true)
1522 }
1523 _ => bug!("ZST {op:?} wasn't ignored, but was passed with abi {arg:?}"),
1524 },
1525 };
1526
1527 if by_ref && !arg.is_indirect() {
1528 if let PassMode::Cast { cast, pad_i32: _ } = &arg.mode {
1530 let scratch_size = cast.size(bx);
1534 let scratch_align = cast.align(bx);
1535 let copy_bytes = cmp::min(cast.unaligned_size(bx).bytes(), arg.layout.size.bytes());
1542 let llscratch = bx.alloca(scratch_size, scratch_align);
1544 bx.lifetime_start(llscratch, scratch_size);
1545 bx.memcpy(
1547 llscratch,
1548 scratch_align,
1549 llval,
1550 align,
1551 bx.const_usize(copy_bytes),
1552 MemFlags::empty(),
1553 );
1554 llval = load_cast(bx, cast, llscratch, scratch_align);
1556 bx.lifetime_end(llscratch, scratch_size);
1557 } else {
1558 llval = bx.load(bx.backend_type(arg.layout), llval, align);
1564 if let BackendRepr::Scalar(scalar) = arg.layout.backend_repr {
1565 if scalar.is_bool() {
1566 bx.range_metadata(llval, WrappingRange { start: 0, end: 1 });
1567 }
1568 llval = bx.to_immediate_scalar(llval, scalar);
1570 }
1571 }
1572 }
1573
1574 llargs.push(llval);
1575 }
1576
1577 fn codegen_arguments_untupled(
1578 &mut self,
1579 bx: &mut Bx,
1580 operand: &mir::Operand<'tcx>,
1581 llargs: &mut Vec<Bx::Value>,
1582 args: &[ArgAbi<'tcx, Ty<'tcx>>],
1583 lifetime_ends_after_call: &mut Vec<(Bx::Value, Size)>,
1584 ) -> usize {
1585 let tuple = self.codegen_operand(bx, operand);
1586
1587 if let Ref(place_val) = tuple.val {
1589 if place_val.llextra.is_some() {
1590 bug!("closure arguments must be sized");
1591 }
1592 let tuple_ptr = place_val.with_type(tuple.layout);
1593 for i in 0..tuple.layout.fields.count() {
1594 let field_ptr = tuple_ptr.project_field(bx, i);
1595 let field = bx.load_operand(field_ptr);
1596 self.codegen_argument(bx, field, llargs, &args[i], lifetime_ends_after_call);
1597 }
1598 } else {
1599 for i in 0..tuple.layout.fields.count() {
1601 let op = tuple.extract_field(self, bx, i);
1602 self.codegen_argument(bx, op, llargs, &args[i], lifetime_ends_after_call);
1603 }
1604 }
1605 tuple.layout.fields.count()
1606 }
1607
1608 pub(super) fn get_caller_location(
1609 &mut self,
1610 bx: &mut Bx,
1611 source_info: mir::SourceInfo,
1612 ) -> OperandRef<'tcx, Bx::Value> {
1613 self.mir.caller_location_span(source_info, self.caller_location, bx.tcx(), |span: Span| {
1614 let const_loc = bx.tcx().span_as_caller_location(span);
1615 OperandRef::from_const(bx, const_loc, bx.tcx().caller_location_ty())
1616 })
1617 }
1618
1619 fn get_personality_slot(&mut self, bx: &mut Bx) -> PlaceRef<'tcx, Bx::Value> {
1620 let cx = bx.cx();
1621 if let Some(slot) = self.personality_slot {
1622 slot
1623 } else {
1624 let layout = cx.layout_of(Ty::new_tup(
1625 cx.tcx(),
1626 &[Ty::new_mut_ptr(cx.tcx(), cx.tcx().types.u8), cx.tcx().types.i32],
1627 ));
1628 let slot = PlaceRef::alloca(bx, layout);
1629 self.personality_slot = Some(slot);
1630 slot
1631 }
1632 }
1633
1634 fn landing_pad_for(&mut self, bb: mir::BasicBlock) -> Bx::BasicBlock {
1637 if let Some(landing_pad) = self.landing_pads[bb] {
1638 return landing_pad;
1639 }
1640
1641 let landing_pad = self.landing_pad_for_uncached(bb);
1642 self.landing_pads[bb] = Some(landing_pad);
1643 landing_pad
1644 }
1645
1646 fn landing_pad_for_uncached(&mut self, bb: mir::BasicBlock) -> Bx::BasicBlock {
1648 let llbb = self.llbb(bb);
1649 if base::wants_new_eh_instructions(self.cx.sess()) {
1650 let cleanup_bb = Bx::append_block(self.cx, self.llfn, &format!("funclet_{bb:?}"));
1651 let mut cleanup_bx = Bx::build(self.cx, cleanup_bb);
1652 let funclet = cleanup_bx.cleanup_pad(None, &[]);
1653 cleanup_bx.br(llbb);
1654 self.funclets[bb] = Some(funclet);
1655 cleanup_bb
1656 } else {
1657 let cleanup_llbb = Bx::append_block(self.cx, self.llfn, "cleanup");
1658 let mut cleanup_bx = Bx::build(self.cx, cleanup_llbb);
1659
1660 let llpersonality = self.cx.eh_personality();
1661 let (exn0, exn1) = cleanup_bx.cleanup_landing_pad(llpersonality);
1662
1663 let slot = self.get_personality_slot(&mut cleanup_bx);
1664 slot.storage_live(&mut cleanup_bx);
1665 Pair(exn0, exn1).store(&mut cleanup_bx, slot);
1666
1667 cleanup_bx.br(llbb);
1668 cleanup_llbb
1669 }
1670 }
1671
1672 fn unreachable_block(&mut self) -> Bx::BasicBlock {
1673 self.unreachable_block.unwrap_or_else(|| {
1674 let llbb = Bx::append_block(self.cx, self.llfn, "unreachable");
1675 let mut bx = Bx::build(self.cx, llbb);
1676 bx.unreachable();
1677 self.unreachable_block = Some(llbb);
1678 llbb
1679 })
1680 }
1681
1682 fn terminate_block(&mut self, reason: UnwindTerminateReason) -> Bx::BasicBlock {
1683 if let Some((cached_bb, cached_reason)) = self.terminate_block
1684 && reason == cached_reason
1685 {
1686 return cached_bb;
1687 }
1688
1689 let funclet;
1690 let llbb;
1691 let mut bx;
1692 if base::wants_new_eh_instructions(self.cx.sess()) {
1693 llbb = Bx::append_block(self.cx, self.llfn, "cs_terminate");
1723 let cp_llbb = Bx::append_block(self.cx, self.llfn, "cp_terminate");
1724
1725 let mut cs_bx = Bx::build(self.cx, llbb);
1726 let cs = cs_bx.catch_switch(None, None, &[cp_llbb]);
1727
1728 bx = Bx::build(self.cx, cp_llbb);
1729 let null =
1730 bx.const_null(bx.type_ptr_ext(bx.cx().data_layout().instruction_address_space));
1731
1732 let args = if base::wants_msvc_seh(self.cx.sess()) {
1736 let adjectives = bx.const_i32(0x40);
1743 &[null, adjectives, null] as &[_]
1744 } else {
1745 &[null] as &[_]
1751 };
1752
1753 funclet = Some(bx.catch_pad(cs, args));
1754 } else {
1755 llbb = Bx::append_block(self.cx, self.llfn, "terminate");
1756 bx = Bx::build(self.cx, llbb);
1757
1758 let llpersonality = self.cx.eh_personality();
1759 bx.filter_landing_pad(llpersonality);
1760
1761 funclet = None;
1762 }
1763
1764 self.set_debug_loc(&mut bx, mir::SourceInfo::outermost(self.mir.span));
1765
1766 let (fn_abi, fn_ptr, instance) =
1767 common::build_langcall(&bx, self.mir.span, reason.lang_item());
1768 if is_call_from_compiler_builtins_to_upstream_monomorphization(bx.tcx(), instance) {
1769 bx.abort();
1770 } else {
1771 let fn_ty = bx.fn_decl_backend_type(fn_abi);
1772
1773 let llret = bx.call(fn_ty, None, Some(fn_abi), fn_ptr, &[], funclet.as_ref(), None);
1774 bx.apply_attrs_to_cleanup_callsite(llret);
1775 }
1776
1777 bx.unreachable();
1778
1779 self.terminate_block = Some((llbb, reason));
1780 llbb
1781 }
1782
1783 pub fn llbb(&mut self, bb: mir::BasicBlock) -> Bx::BasicBlock {
1788 self.try_llbb(bb).unwrap()
1789 }
1790
1791 pub(crate) fn try_llbb(&mut self, bb: mir::BasicBlock) -> Option<Bx::BasicBlock> {
1793 match self.cached_llbbs[bb] {
1794 CachedLlbb::None => {
1795 let llbb = Bx::append_block(self.cx, self.llfn, &format!("{bb:?}"));
1796 self.cached_llbbs[bb] = CachedLlbb::Some(llbb);
1797 Some(llbb)
1798 }
1799 CachedLlbb::Some(llbb) => Some(llbb),
1800 CachedLlbb::Skip => None,
1801 }
1802 }
1803
1804 fn make_return_dest(
1805 &mut self,
1806 bx: &mut Bx,
1807 dest: mir::Place<'tcx>,
1808 fn_ret: &ArgAbi<'tcx, Ty<'tcx>>,
1809 llargs: &mut Vec<Bx::Value>,
1810 ) -> ReturnDest<'tcx, Bx::Value> {
1811 if fn_ret.is_ignore() {
1813 return ReturnDest::Nothing;
1814 }
1815 let dest = if let Some(index) = dest.as_local() {
1816 match self.locals[index] {
1817 LocalRef::Place(dest) => dest,
1818 LocalRef::UnsizedPlace(_) => bug!("return type must be sized"),
1819 LocalRef::PendingOperand => {
1820 return if fn_ret.is_indirect() {
1823 let tmp = PlaceRef::alloca(bx, fn_ret.layout);
1826 tmp.storage_live(bx);
1827 llargs.push(tmp.val.llval);
1828 ReturnDest::IndirectOperand(tmp, index)
1829 } else {
1830 ReturnDest::DirectOperand(index)
1831 };
1832 }
1833 LocalRef::Operand(_) => {
1834 bug!("place local already assigned to");
1835 }
1836 }
1837 } else {
1838 self.codegen_place(bx, dest.as_ref())
1839 };
1840 if fn_ret.is_indirect() {
1841 if dest.val.align < dest.layout.align.abi {
1842 span_bug!(self.mir.span, "can't directly store to unaligned value");
1849 }
1850 llargs.push(dest.val.llval);
1851 ReturnDest::Nothing
1852 } else {
1853 ReturnDest::Store(dest)
1854 }
1855 }
1856
1857 fn store_return(
1859 &mut self,
1860 bx: &mut Bx,
1861 dest: ReturnDest<'tcx, Bx::Value>,
1862 ret_abi: &ArgAbi<'tcx, Ty<'tcx>>,
1863 llval: Bx::Value,
1864 ) {
1865 use self::ReturnDest::*;
1866
1867 match dest {
1868 Nothing => (),
1869 Store(dst) => bx.store_arg(ret_abi, llval, dst),
1870 IndirectOperand(tmp, index) => {
1871 let op = bx.load_operand(tmp);
1872 tmp.storage_dead(bx);
1873 self.overwrite_local(index, LocalRef::Operand(op));
1874 self.debug_introduce_local(bx, index);
1875 }
1876 DirectOperand(index) => {
1877 let op = if let PassMode::Cast { .. } = ret_abi.mode {
1879 let tmp = PlaceRef::alloca(bx, ret_abi.layout);
1880 tmp.storage_live(bx);
1881 bx.store_arg(ret_abi, llval, tmp);
1882 let op = bx.load_operand(tmp);
1883 tmp.storage_dead(bx);
1884 op
1885 } else {
1886 OperandRef::from_immediate_or_packed_pair(bx, llval, ret_abi.layout)
1887 };
1888 self.overwrite_local(index, LocalRef::Operand(op));
1889 self.debug_introduce_local(bx, index);
1890 }
1891 }
1892 }
1893}
1894
1895enum ReturnDest<'tcx, V> {
1896 Nothing,
1898 Store(PlaceRef<'tcx, V>),
1900 IndirectOperand(PlaceRef<'tcx, V>, mir::Local),
1902 DirectOperand(mir::Local),
1904}
1905
1906fn load_cast<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
1907 bx: &mut Bx,
1908 cast: &CastTarget,
1909 ptr: Bx::Value,
1910 align: Align,
1911) -> Bx::Value {
1912 let cast_ty = bx.cast_backend_type(cast);
1913 if let Some(offset_from_start) = cast.rest_offset {
1914 assert!(cast.prefix[1..].iter().all(|p| p.is_none()));
1915 assert_eq!(cast.rest.unit.size, cast.rest.total);
1916 let first_ty = bx.reg_backend_type(&cast.prefix[0].unwrap());
1917 let second_ty = bx.reg_backend_type(&cast.rest.unit);
1918 let first = bx.load(first_ty, ptr, align);
1919 let second_ptr = bx.inbounds_ptradd(ptr, bx.const_usize(offset_from_start.bytes()));
1920 let second = bx.load(second_ty, second_ptr, align.restrict_for_offset(offset_from_start));
1921 let res = bx.cx().const_poison(cast_ty);
1922 let res = bx.insert_value(res, first, 0);
1923 bx.insert_value(res, second, 1)
1924 } else {
1925 bx.load(cast_ty, ptr, align)
1926 }
1927}
1928
1929pub fn store_cast<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
1930 bx: &mut Bx,
1931 cast: &CastTarget,
1932 value: Bx::Value,
1933 ptr: Bx::Value,
1934 align: Align,
1935) {
1936 if let Some(offset_from_start) = cast.rest_offset {
1937 assert!(cast.prefix[1..].iter().all(|p| p.is_none()));
1938 assert_eq!(cast.rest.unit.size, cast.rest.total);
1939 assert!(cast.prefix[0].is_some());
1940 let first = bx.extract_value(value, 0);
1941 let second = bx.extract_value(value, 1);
1942 bx.store(first, ptr, align);
1943 let second_ptr = bx.inbounds_ptradd(ptr, bx.const_usize(offset_from_start.bytes()));
1944 bx.store(second, second_ptr, align.restrict_for_offset(offset_from_start));
1945 } else {
1946 bx.store(value, ptr, align);
1947 };
1948}