forked from rust-lang/rust
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathbase.rs
1070 lines (979 loc) · 43 KB
/
base.rs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//! Codegen of a single function
use cranelift_codegen::ir::UserFuncName;
use cranelift_codegen::CodegenError;
use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext};
use cranelift_module::ModuleError;
use rustc_ast::InlineAsmOptions;
use rustc_index::IndexVec;
use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
use rustc_middle::ty::adjustment::PointerCoercion;
use rustc_middle::ty::layout::FnAbiOf;
use rustc_middle::ty::print::with_no_trimmed_paths;
use rustc_middle::ty::TypeVisitableExt;
use rustc_monomorphize::is_call_from_compiler_builtins_to_upstream_monomorphization;
use crate::constant::ConstantCx;
use crate::debuginfo::{FunctionDebugContext, TypeDebugContext};
use crate::inline_asm::codegen_naked_asm;
use crate::prelude::*;
use crate::pretty_clif::CommentWriter;
pub(crate) struct CodegenedFunction {
symbol_name: String,
func_id: FuncId,
func: Function,
clif_comments: CommentWriter,
func_debug_cx: Option<FunctionDebugContext>,
}
pub(crate) fn codegen_fn<'tcx>(
tcx: TyCtxt<'tcx>,
cx: &mut crate::CodegenCx,
type_dbg: &mut TypeDebugContext<'tcx>,
cached_func: Function,
module: &mut dyn Module,
instance: Instance<'tcx>,
) -> Option<CodegenedFunction> {
debug_assert!(!instance.args.has_infer());
let symbol_name = tcx.symbol_name(instance).name.to_string();
let _timer = tcx.prof.generic_activity_with_arg("codegen fn", &*symbol_name);
let mir = tcx.instance_mir(instance.def);
let _mir_guard = crate::PrintOnPanic(|| {
let mut buf = Vec::new();
with_no_trimmed_paths!({
rustc_middle::mir::pretty::write_mir_fn(tcx, mir, &mut |_, _| Ok(()), &mut buf)
.unwrap();
});
String::from_utf8_lossy(&buf).into_owned()
});
if tcx.codegen_fn_attrs(instance.def_id()).flags.contains(CodegenFnAttrFlags::NAKED) {
assert_eq!(mir.basic_blocks.len(), 1);
assert!(mir.basic_blocks[START_BLOCK].statements.is_empty());
match &mir.basic_blocks[START_BLOCK].terminator().kind {
TerminatorKind::InlineAsm {
template,
operands,
options,
line_spans: _,
targets: _,
unwind: _,
} => {
codegen_naked_asm(
tcx,
cx,
module,
instance,
mir.basic_blocks[START_BLOCK].terminator().source_info.span,
&symbol_name,
template,
operands,
*options,
);
}
_ => unreachable!(),
}
return None;
}
// Declare function
let sig = get_function_sig(tcx, module.target_config().default_call_conv, instance);
let func_id = module.declare_function(&symbol_name, Linkage::Local, &sig).unwrap();
// Make the FunctionBuilder
let mut func_ctx = FunctionBuilderContext::new();
let mut func = cached_func;
func.clear();
func.name = UserFuncName::user(0, func_id.as_u32());
func.signature = sig;
func.collect_debug_info();
let mut bcx = FunctionBuilder::new(&mut func, &mut func_ctx);
// Predefine blocks
let start_block = bcx.create_block();
let block_map: IndexVec<BasicBlock, Block> =
(0..mir.basic_blocks.len()).map(|_| bcx.create_block()).collect();
// Make FunctionCx
let target_config = module.target_config();
let pointer_type = target_config.pointer_type();
let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance);
let fn_abi = RevealAllLayoutCx(tcx).fn_abi_of_instance(instance, ty::List::empty());
let func_debug_cx = if let Some(debug_context) = &mut cx.debug_context {
Some(debug_context.define_function(tcx, type_dbg, instance, fn_abi, &symbol_name, mir.span))
} else {
None
};
let mut fx = FunctionCx {
cx,
module,
tcx,
target_config,
pointer_type,
constants_cx: ConstantCx::new(),
func_debug_cx,
instance,
symbol_name,
mir,
fn_abi,
bcx,
block_map,
local_map: IndexVec::with_capacity(mir.local_decls.len()),
caller_location: None, // set by `codegen_fn_prelude`
clif_comments,
next_ssa_var: 0,
};
tcx.prof.generic_activity("codegen clif ir").run(|| codegen_fn_body(&mut fx, start_block));
fx.bcx.seal_all_blocks();
fx.bcx.finalize();
// Recover all necessary data from fx, before accessing func will prevent future access to it.
let symbol_name = fx.symbol_name;
let clif_comments = fx.clif_comments;
let func_debug_cx = fx.func_debug_cx;
fx.constants_cx.finalize(fx.tcx, &mut *fx.module);
if cx.should_write_ir {
crate::pretty_clif::write_clif_file(
tcx.output_filenames(()),
&symbol_name,
"unopt",
module.isa(),
&func,
&clif_comments,
);
}
// Verify function
verify_func(tcx, &clif_comments, &func);
Some(CodegenedFunction { symbol_name, func_id, func, clif_comments, func_debug_cx })
}
pub(crate) fn compile_fn(
cx: &mut crate::CodegenCx,
cached_context: &mut Context,
module: &mut dyn Module,
codegened_func: CodegenedFunction,
) {
let _timer =
cx.profiler.generic_activity_with_arg("compile function", &*codegened_func.symbol_name);
let clif_comments = codegened_func.clif_comments;
// Store function in context
let context = cached_context;
context.clear();
context.func = codegened_func.func;
#[cfg(any())] // This is never true
let _clif_guard = {
use std::fmt::Write;
let func_clone = context.func.clone();
let clif_comments_clone = clif_comments.clone();
let mut clif = String::new();
for flag in module.isa().flags().iter() {
writeln!(clif, "set {}", flag).unwrap();
}
write!(clif, "target {}", module.isa().triple().architecture.to_string()).unwrap();
for isa_flag in module.isa().isa_flags().iter() {
write!(clif, " {}", isa_flag).unwrap();
}
writeln!(clif, "\n").unwrap();
writeln!(clif, "; symbol {}", codegened_func.symbol_name).unwrap();
crate::PrintOnPanic(move || {
let mut clif = clif.clone();
::cranelift_codegen::write::decorate_function(
&mut &clif_comments_clone,
&mut clif,
&func_clone,
)
.unwrap();
clif
})
};
// Define function
cx.profiler.generic_activity("define function").run(|| {
context.want_disasm = cx.should_write_ir;
match module.define_function(codegened_func.func_id, context) {
Ok(()) => {}
Err(ModuleError::Compilation(CodegenError::ImplLimitExceeded)) => {
let early_dcx = rustc_session::EarlyDiagCtxt::new(
rustc_session::config::ErrorOutputType::default(),
);
early_dcx.early_fatal(format!(
"backend implementation limit exceeded while compiling {name}",
name = codegened_func.symbol_name
));
}
Err(err) => {
panic!("Error while defining {name}: {err:?}", name = codegened_func.symbol_name);
}
}
});
if cx.should_write_ir {
// Write optimized function to file for debugging
crate::pretty_clif::write_clif_file(
&cx.output_filenames,
&codegened_func.symbol_name,
"opt",
module.isa(),
&context.func,
&clif_comments,
);
if let Some(disasm) = &context.compiled_code().unwrap().vcode {
crate::pretty_clif::write_ir_file(
&cx.output_filenames,
&format!("{}.vcode", codegened_func.symbol_name),
|file| file.write_all(disasm.as_bytes()),
)
}
}
// Define debuginfo for function
let isa = module.isa();
let debug_context = &mut cx.debug_context;
let unwind_context = &mut cx.unwind_context;
cx.profiler.generic_activity("generate debug info").run(|| {
if let Some(debug_context) = debug_context {
codegened_func.func_debug_cx.unwrap().finalize(
debug_context,
codegened_func.func_id,
context,
);
}
unwind_context.add_function(codegened_func.func_id, &context, isa);
});
}
pub(crate) fn verify_func(
tcx: TyCtxt<'_>,
writer: &crate::pretty_clif::CommentWriter,
func: &Function,
) {
tcx.prof.generic_activity("verify clif ir").run(|| {
let flags = cranelift_codegen::settings::Flags::new(cranelift_codegen::settings::builder());
match cranelift_codegen::verify_function(&func, &flags) {
Ok(_) => {}
Err(err) => {
tcx.dcx().err(format!("{:?}", err));
let pretty_error = cranelift_codegen::print_errors::pretty_verifier_error(
&func,
Some(Box::new(writer)),
err,
);
tcx.dcx().fatal(format!("cranelift verify error:\n{}", pretty_error));
}
}
});
}
fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
let arg_uninhabited = fx
.mir
.args_iter()
.any(|arg| fx.layout_of(fx.monomorphize(fx.mir.local_decls[arg].ty)).abi.is_uninhabited());
if arg_uninhabited {
fx.bcx.append_block_params_for_function_params(fx.block_map[START_BLOCK]);
fx.bcx.switch_to_block(fx.block_map[START_BLOCK]);
fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
return;
}
fx.tcx
.prof
.generic_activity("codegen prelude")
.run(|| crate::abi::codegen_fn_prelude(fx, start_block));
let reachable_blocks = traversal::mono_reachable_as_bitset(fx.mir, fx.tcx, fx.instance);
for (bb, bb_data) in fx.mir.basic_blocks.iter_enumerated() {
let block = fx.get_block(bb);
fx.bcx.switch_to_block(block);
if !reachable_blocks.contains(bb) {
// We want to skip this block, because it's not reachable. But we still create
// the block so terminators in other blocks can reference it.
fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
continue;
}
if bb_data.is_cleanup {
// Unwinding after panicking is not supported
continue;
// FIXME Once unwinding is supported and Cranelift supports marking blocks as cold, do
// so for cleanup blocks.
}
fx.bcx.ins().nop();
for stmt in &bb_data.statements {
fx.set_debug_loc(stmt.source_info);
codegen_stmt(fx, block, stmt);
}
if fx.clif_comments.enabled() {
let mut terminator_head = "\n".to_string();
with_no_trimmed_paths!({
bb_data.terminator().kind.fmt_head(&mut terminator_head).unwrap();
});
let inst = fx.bcx.func.layout.last_inst(block).unwrap();
fx.add_comment(inst, terminator_head);
}
let source_info = bb_data.terminator().source_info;
fx.set_debug_loc(source_info);
let _print_guard =
crate::PrintOnPanic(|| format!("terminator {:?}", bb_data.terminator().kind));
match &bb_data.terminator().kind {
TerminatorKind::Goto { target } => {
if let TerminatorKind::Return = fx.mir[*target].terminator().kind {
let mut can_immediately_return = true;
for stmt in &fx.mir[*target].statements {
if let StatementKind::StorageDead(_) = stmt.kind {
} else {
// FIXME Can sometimes happen, see rust-lang/rust#70531
can_immediately_return = false;
break;
}
}
if can_immediately_return {
crate::abi::codegen_return(fx);
continue;
}
}
let block = fx.get_block(*target);
fx.bcx.ins().jump(block, &[]);
}
TerminatorKind::Return => {
crate::abi::codegen_return(fx);
}
TerminatorKind::Assert { cond, expected, msg, target, unwind: _ } => {
if !fx.tcx.sess.overflow_checks() && msg.is_optional_overflow_check() {
let target = fx.get_block(*target);
fx.bcx.ins().jump(target, &[]);
continue;
}
let cond = codegen_operand(fx, cond).load_scalar(fx);
let target = fx.get_block(*target);
let failure = fx.bcx.create_block();
fx.bcx.set_cold_block(failure);
if *expected {
fx.bcx.ins().brif(cond, target, &[], failure, &[]);
} else {
fx.bcx.ins().brif(cond, failure, &[], target, &[]);
};
fx.bcx.switch_to_block(failure);
fx.bcx.ins().nop();
match &**msg {
AssertKind::BoundsCheck { ref len, ref index } => {
let len = codegen_operand(fx, len).load_scalar(fx);
let index = codegen_operand(fx, index).load_scalar(fx);
let location = fx.get_caller_location(source_info).load_scalar(fx);
codegen_panic_inner(
fx,
rustc_hir::LangItem::PanicBoundsCheck,
&[index, len, location],
Some(source_info.span),
);
}
AssertKind::MisalignedPointerDereference { ref required, ref found } => {
let required = codegen_operand(fx, required).load_scalar(fx);
let found = codegen_operand(fx, found).load_scalar(fx);
let location = fx.get_caller_location(source_info).load_scalar(fx);
codegen_panic_inner(
fx,
rustc_hir::LangItem::PanicMisalignedPointerDereference,
&[required, found, location],
Some(source_info.span),
);
}
_ => {
let location = fx.get_caller_location(source_info).load_scalar(fx);
codegen_panic_inner(
fx,
msg.panic_function(),
&[location],
Some(source_info.span),
);
}
}
}
TerminatorKind::SwitchInt { discr, targets } => {
let discr = codegen_operand(fx, discr);
let switch_ty = discr.layout().ty;
let discr = discr.load_scalar(fx);
let use_bool_opt = switch_ty.kind() == fx.tcx.types.bool.kind()
|| (targets.iter().count() == 1 && targets.iter().next().unwrap().0 == 0);
if use_bool_opt {
assert_eq!(targets.iter().count(), 1);
let (then_value, then_block) = targets.iter().next().unwrap();
let then_block = fx.get_block(then_block);
let else_block = fx.get_block(targets.otherwise());
let test_zero = match then_value {
0 => true,
1 => false,
_ => unreachable!("{:?}", targets),
};
let (discr, is_inverted) =
crate::optimize::peephole::maybe_unwrap_bool_not(&mut fx.bcx, discr);
let test_zero = if is_inverted { !test_zero } else { test_zero };
if let Some(taken) = crate::optimize::peephole::maybe_known_branch_taken(
&fx.bcx, discr, test_zero,
) {
if taken {
fx.bcx.ins().jump(then_block, &[]);
} else {
fx.bcx.ins().jump(else_block, &[]);
}
} else {
if test_zero {
fx.bcx.ins().brif(discr, else_block, &[], then_block, &[]);
} else {
fx.bcx.ins().brif(discr, then_block, &[], else_block, &[]);
}
}
} else {
let mut switch = ::cranelift_frontend::Switch::new();
for (value, block) in targets.iter() {
let block = fx.get_block(block);
switch.set_entry(value, block);
}
let otherwise_block = fx.get_block(targets.otherwise());
switch.emit(&mut fx.bcx, discr, otherwise_block);
}
}
TerminatorKind::Call {
func,
args,
destination,
target,
fn_span,
unwind: _,
call_source: _,
} => {
fx.tcx.prof.generic_activity("codegen call").run(|| {
crate::abi::codegen_terminator_call(
fx,
mir::SourceInfo { span: *fn_span, ..source_info },
func,
args,
*destination,
*target,
)
});
}
TerminatorKind::InlineAsm {
template,
operands,
options,
targets,
line_spans: _,
unwind: _,
} => {
if options.contains(InlineAsmOptions::MAY_UNWIND) {
fx.tcx.dcx().span_fatal(
source_info.span,
"cranelift doesn't support unwinding from inline assembly.",
);
}
let have_labels = if options.contains(InlineAsmOptions::NORETURN) {
!targets.is_empty()
} else {
targets.len() > 1
};
if have_labels {
fx.tcx.dcx().span_fatal(
source_info.span,
"cranelift doesn't support labels in inline assembly.",
);
}
crate::inline_asm::codegen_inline_asm_terminator(
fx,
source_info.span,
template,
operands,
*options,
targets.get(0).copied(),
);
}
TerminatorKind::UnwindTerminate(reason) => {
codegen_unwind_terminate(fx, source_info, *reason);
}
TerminatorKind::UnwindResume => {
// FIXME implement unwinding
fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
}
TerminatorKind::Unreachable => {
fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
}
TerminatorKind::Yield { .. }
| TerminatorKind::FalseEdge { .. }
| TerminatorKind::FalseUnwind { .. }
| TerminatorKind::CoroutineDrop => {
bug!("shouldn't exist at codegen {:?}", bb_data.terminator());
}
TerminatorKind::Drop { place, target, unwind: _, replace: _ } => {
let drop_place = codegen_place(fx, *place);
crate::abi::codegen_drop(fx, source_info, drop_place);
let target_block = fx.get_block(*target);
fx.bcx.ins().jump(target_block, &[]);
}
};
}
}
fn codegen_stmt<'tcx>(
fx: &mut FunctionCx<'_, '_, 'tcx>,
#[allow(unused_variables)] cur_block: Block,
stmt: &Statement<'tcx>,
) {
let _print_guard = crate::PrintOnPanic(|| format!("stmt {:?}", stmt));
fx.set_debug_loc(stmt.source_info);
match &stmt.kind {
StatementKind::StorageLive(..) | StatementKind::StorageDead(..) => {} // Those are not very useful
_ => {
if fx.clif_comments.enabled() {
let inst = fx.bcx.func.layout.last_inst(cur_block).unwrap();
with_no_trimmed_paths!({
fx.add_comment(inst, format!("{:?}", stmt));
});
}
}
}
match &stmt.kind {
StatementKind::SetDiscriminant { place, variant_index } => {
let place = codegen_place(fx, **place);
crate::discriminant::codegen_set_discriminant(fx, place, *variant_index);
}
StatementKind::Assign(to_place_and_rval) => {
let lval = codegen_place(fx, to_place_and_rval.0);
let dest_layout = lval.layout();
match to_place_and_rval.1 {
Rvalue::Use(ref operand) => {
let val = codegen_operand(fx, operand);
lval.write_cvalue(fx, val);
}
Rvalue::CopyForDeref(place) => {
let cplace = codegen_place(fx, place);
let val = cplace.to_cvalue(fx);
lval.write_cvalue(fx, val)
}
Rvalue::Ref(_, _, place) | Rvalue::AddressOf(_, place) => {
let place = codegen_place(fx, place);
let ref_ = place.place_ref(fx, lval.layout());
lval.write_cvalue(fx, ref_);
}
Rvalue::ThreadLocalRef(def_id) => {
let val = crate::constant::codegen_tls_ref(fx, def_id, lval.layout());
lval.write_cvalue(fx, val);
}
Rvalue::BinaryOp(bin_op, ref lhs_rhs) => {
let lhs = codegen_operand(fx, &lhs_rhs.0);
let rhs = codegen_operand(fx, &lhs_rhs.1);
let res = if let Some(bin_op) = bin_op.overflowing_to_wrapping() {
crate::num::codegen_checked_int_binop(fx, bin_op, lhs, rhs)
} else {
crate::num::codegen_binop(fx, bin_op, lhs, rhs)
};
lval.write_cvalue(fx, res);
}
Rvalue::UnaryOp(un_op, ref operand) => {
let operand = codegen_operand(fx, operand);
let layout = operand.layout();
let val = operand.load_scalar(fx);
let res = match un_op {
UnOp::Not => match layout.ty.kind() {
ty::Bool => {
let res = fx.bcx.ins().icmp_imm(IntCC::Equal, val, 0);
CValue::by_val(res, layout)
}
ty::Uint(_) | ty::Int(_) => {
CValue::by_val(fx.bcx.ins().bnot(val), layout)
}
_ => unreachable!("un op Not for {:?}", layout.ty),
},
UnOp::Neg => match layout.ty.kind() {
ty::Int(_) => CValue::by_val(fx.bcx.ins().ineg(val), layout),
ty::Float(_) => CValue::by_val(fx.bcx.ins().fneg(val), layout),
_ => unreachable!("un op Neg for {:?}", layout.ty),
},
};
lval.write_cvalue(fx, res);
}
Rvalue::Cast(
CastKind::PointerCoercion(PointerCoercion::ReifyFnPointer),
ref operand,
to_ty,
) => {
let from_ty = fx.monomorphize(operand.ty(&fx.mir.local_decls, fx.tcx));
let to_layout = fx.layout_of(fx.monomorphize(to_ty));
match *from_ty.kind() {
ty::FnDef(def_id, args) => {
let func_ref = fx.get_function_ref(
Instance::resolve_for_fn_ptr(
fx.tcx,
ParamEnv::reveal_all(),
def_id,
args,
)
.unwrap()
.polymorphize(fx.tcx),
);
let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
lval.write_cvalue(fx, CValue::by_val(func_addr, to_layout));
}
_ => bug!("Trying to ReifyFnPointer on non FnDef {:?}", from_ty),
}
}
Rvalue::Cast(
CastKind::PointerCoercion(PointerCoercion::UnsafeFnPointer),
ref operand,
to_ty,
)
| Rvalue::Cast(
CastKind::PointerCoercion(PointerCoercion::MutToConstPointer),
ref operand,
to_ty,
)
| Rvalue::Cast(
CastKind::PointerCoercion(PointerCoercion::ArrayToPointer),
ref operand,
to_ty,
) => {
let to_layout = fx.layout_of(fx.monomorphize(to_ty));
let operand = codegen_operand(fx, operand);
lval.write_cvalue(fx, operand.cast_pointer_to(to_layout));
}
Rvalue::Cast(
CastKind::IntToInt
| CastKind::FloatToFloat
| CastKind::FloatToInt
| CastKind::IntToFloat
| CastKind::FnPtrToPtr
| CastKind::PtrToPtr
| CastKind::PointerExposeProvenance
| CastKind::PointerWithExposedProvenance,
ref operand,
to_ty,
) => {
let operand = codegen_operand(fx, operand);
let from_ty = operand.layout().ty;
let to_ty = fx.monomorphize(to_ty);
fn is_fat_ptr<'tcx>(fx: &FunctionCx<'_, '_, 'tcx>, ty: Ty<'tcx>) -> bool {
ty.builtin_deref(true)
.is_some_and(|pointee_ty| has_ptr_meta(fx.tcx, pointee_ty))
}
if is_fat_ptr(fx, from_ty) {
if is_fat_ptr(fx, to_ty) {
// fat-ptr -> fat-ptr
lval.write_cvalue(fx, operand.cast_pointer_to(dest_layout));
} else {
// fat-ptr -> thin-ptr
let (ptr, _extra) = operand.load_scalar_pair(fx);
lval.write_cvalue(fx, CValue::by_val(ptr, dest_layout))
}
} else {
let to_clif_ty = fx.clif_type(to_ty).unwrap();
let from = operand.load_scalar(fx);
let res = clif_int_or_float_cast(
fx,
from,
type_sign(from_ty),
to_clif_ty,
type_sign(to_ty),
);
lval.write_cvalue(fx, CValue::by_val(res, dest_layout));
}
}
Rvalue::Cast(
CastKind::PointerCoercion(PointerCoercion::ClosureFnPointer(_)),
ref operand,
_to_ty,
) => {
let operand = codegen_operand(fx, operand);
match *operand.layout().ty.kind() {
ty::Closure(def_id, args) => {
let instance = Instance::resolve_closure(
fx.tcx,
def_id,
args,
ty::ClosureKind::FnOnce,
)
.polymorphize(fx.tcx);
let func_ref = fx.get_function_ref(instance);
let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
lval.write_cvalue(fx, CValue::by_val(func_addr, lval.layout()));
}
_ => bug!("{} cannot be cast to a fn ptr", operand.layout().ty),
}
}
Rvalue::Cast(
CastKind::PointerCoercion(PointerCoercion::Unsize),
ref operand,
_to_ty,
) => {
let operand = codegen_operand(fx, operand);
crate::unsize::coerce_unsized_into(fx, operand, lval);
}
Rvalue::Cast(CastKind::DynStar, ref operand, _) => {
let operand = codegen_operand(fx, operand);
crate::unsize::coerce_dyn_star(fx, operand, lval);
}
Rvalue::Cast(CastKind::Transmute, ref operand, _to_ty) => {
let operand = codegen_operand(fx, operand);
lval.write_cvalue_transmute(fx, operand);
}
Rvalue::Discriminant(place) => {
let place = codegen_place(fx, place);
let value = place.to_cvalue(fx);
crate::discriminant::codegen_get_discriminant(fx, lval, value, dest_layout);
}
Rvalue::Repeat(ref operand, times) => {
let operand = codegen_operand(fx, operand);
let times =
fx.monomorphize(times).eval_target_usize(fx.tcx, ParamEnv::reveal_all());
if operand.layout().size.bytes() == 0 {
// Do nothing for ZST's
} else if fx.clif_type(operand.layout().ty) == Some(types::I8) {
let times = fx.bcx.ins().iconst(fx.pointer_type, times as i64);
// FIXME use emit_small_memset where possible
let addr = lval.to_ptr().get_addr(fx);
let val = operand.load_scalar(fx);
fx.bcx.call_memset(fx.target_config, addr, val, times);
} else {
let loop_block = fx.bcx.create_block();
let loop_block2 = fx.bcx.create_block();
let done_block = fx.bcx.create_block();
let index = fx.bcx.append_block_param(loop_block, fx.pointer_type);
let zero = fx.bcx.ins().iconst(fx.pointer_type, 0);
fx.bcx.ins().jump(loop_block, &[zero]);
fx.bcx.switch_to_block(loop_block);
let done = fx.bcx.ins().icmp_imm(IntCC::Equal, index, times as i64);
fx.bcx.ins().brif(done, done_block, &[], loop_block2, &[]);
fx.bcx.switch_to_block(loop_block2);
let to = lval.place_index(fx, index);
to.write_cvalue(fx, operand);
let index = fx.bcx.ins().iadd_imm(index, 1);
fx.bcx.ins().jump(loop_block, &[index]);
fx.bcx.switch_to_block(done_block);
fx.bcx.ins().nop();
}
}
Rvalue::Len(place) => {
let place = codegen_place(fx, place);
let usize_layout = fx.layout_of(fx.tcx.types.usize);
let len = codegen_array_len(fx, place);
lval.write_cvalue(fx, CValue::by_val(len, usize_layout));
}
Rvalue::ShallowInitBox(ref operand, content_ty) => {
let content_ty = fx.monomorphize(content_ty);
let box_layout = fx.layout_of(Ty::new_box(fx.tcx, content_ty));
let operand = codegen_operand(fx, operand);
let operand = operand.load_scalar(fx);
lval.write_cvalue(fx, CValue::by_val(operand, box_layout));
}
Rvalue::NullaryOp(ref null_op, ty) => {
assert!(lval.layout().ty.is_sized(fx.tcx, ParamEnv::reveal_all()));
let layout = fx.layout_of(fx.monomorphize(ty));
let val = match null_op {
NullOp::SizeOf => layout.size.bytes(),
NullOp::AlignOf => layout.align.abi.bytes(),
NullOp::OffsetOf(fields) => {
layout.offset_of_subfield(fx, fields.iter()).bytes()
}
NullOp::UbChecks => {
let val = fx.tcx.sess.ub_checks();
let val = CValue::by_val(
fx.bcx.ins().iconst(types::I8, i64::try_from(val).unwrap()),
fx.layout_of(fx.tcx.types.bool),
);
lval.write_cvalue(fx, val);
return;
}
};
let val = CValue::by_val(
fx.bcx.ins().iconst(fx.pointer_type, i64::try_from(val).unwrap()),
fx.layout_of(fx.tcx.types.usize),
);
lval.write_cvalue(fx, val);
}
Rvalue::Aggregate(ref kind, ref operands)
if matches!(**kind, AggregateKind::RawPtr(..)) =>
{
let ty = to_place_and_rval.1.ty(&fx.mir.local_decls, fx.tcx);
let layout = fx.layout_of(fx.monomorphize(ty));
let [data, meta] = &*operands.raw else {
bug!("RawPtr fields: {operands:?}");
};
let data = codegen_operand(fx, data);
let meta = codegen_operand(fx, meta);
assert!(data.layout().ty.is_unsafe_ptr());
assert!(layout.ty.is_unsafe_ptr());
let ptr_val = if meta.layout().is_zst() {
data.cast_pointer_to(layout)
} else {
CValue::by_val_pair(data.load_scalar(fx), meta.load_scalar(fx), layout)
};
lval.write_cvalue(fx, ptr_val);
}
Rvalue::Aggregate(ref kind, ref operands) => {
let (variant_index, variant_dest, active_field_index) = match **kind {
mir::AggregateKind::Adt(_, variant_index, _, _, active_field_index) => {
let variant_dest = lval.downcast_variant(fx, variant_index);
(variant_index, variant_dest, active_field_index)
}
_ => (FIRST_VARIANT, lval, None),
};
if active_field_index.is_some() {
assert_eq!(operands.len(), 1);
}
for (i, operand) in operands.iter_enumerated() {
let operand = codegen_operand(fx, operand);
let field_index = active_field_index.unwrap_or(i);
let to = if let mir::AggregateKind::Array(_) = **kind {
let array_index = i64::from(field_index.as_u32());
let index = fx.bcx.ins().iconst(fx.pointer_type, array_index);
variant_dest.place_index(fx, index)
} else {
variant_dest.place_field(fx, field_index)
};
to.write_cvalue(fx, operand);
}
crate::discriminant::codegen_set_discriminant(fx, lval, variant_index);
}
}
}
StatementKind::StorageLive(_)
| StatementKind::StorageDead(_)
| StatementKind::Deinit(_)
| StatementKind::ConstEvalCounter
| StatementKind::Nop
| StatementKind::FakeRead(..)
| StatementKind::Retag { .. }
| StatementKind::PlaceMention(..)
| StatementKind::AscribeUserType(..) => {}
StatementKind::Coverage { .. } => fx.tcx.dcx().fatal("-Zcoverage is unimplemented"),
StatementKind::Intrinsic(ref intrinsic) => match &**intrinsic {
// We ignore `assume` intrinsics, they are only useful for optimizations
NonDivergingIntrinsic::Assume(_) => {}
NonDivergingIntrinsic::CopyNonOverlapping(mir::CopyNonOverlapping {
src,
dst,
count,
}) => {
let dst = codegen_operand(fx, dst);
let pointee = dst
.layout()
.pointee_info_at(fx, rustc_target::abi::Size::ZERO)
.expect("Expected pointer");
let dst = dst.load_scalar(fx);
let src = codegen_operand(fx, src).load_scalar(fx);
let count = codegen_operand(fx, count).load_scalar(fx);
let elem_size: u64 = pointee.size.bytes();
let bytes = if elem_size != 1 {
fx.bcx.ins().imul_imm(count, elem_size as i64)
} else {
count
};
fx.bcx.call_memcpy(fx.target_config, dst, src, bytes);
}
},
}
}
fn codegen_array_len<'tcx>(fx: &mut FunctionCx<'_, '_, 'tcx>, place: CPlace<'tcx>) -> Value {
match *place.layout().ty.kind() {
ty::Array(_elem_ty, len) => {
let len = fx.monomorphize(len).eval_target_usize(fx.tcx, ParamEnv::reveal_all()) as i64;
fx.bcx.ins().iconst(fx.pointer_type, len)
}
ty::Slice(_elem_ty) => place.to_ptr_unsized().1,
_ => bug!("Rvalue::Len({:?})", place),
}
}
pub(crate) fn codegen_place<'tcx>(
fx: &mut FunctionCx<'_, '_, 'tcx>,
place: Place<'tcx>,
) -> CPlace<'tcx> {
let mut cplace = fx.get_local_place(place.local);
for elem in place.projection {
match elem {
PlaceElem::Deref => {
cplace = cplace.place_deref(fx);
}
PlaceElem::OpaqueCast(ty) => bug!("encountered OpaqueCast({ty}) in codegen"),
PlaceElem::Subtype(ty) => cplace = cplace.place_transmute_type(fx, fx.monomorphize(ty)),
PlaceElem::Field(field, _ty) => {
cplace = cplace.place_field(fx, field);
}
PlaceElem::Index(local) => {
let index = fx.get_local_place(local).to_cvalue(fx).load_scalar(fx);
cplace = cplace.place_index(fx, index);
}
PlaceElem::ConstantIndex { offset, min_length: _, from_end } => {
let offset: u64 = offset;
let index = if !from_end {
fx.bcx.ins().iconst(fx.pointer_type, offset as i64)
} else {
let len = codegen_array_len(fx, cplace);
fx.bcx.ins().iadd_imm(len, -(offset as i64))
};
cplace = cplace.place_index(fx, index);
}
PlaceElem::Subslice { from, to, from_end } => {
// These indices are generated by slice patterns.
// slice[from:-to] in Python terms.
let from: u64 = from;
let to: u64 = to;
match cplace.layout().ty.kind() {
ty::Array(elem_ty, _len) => {
assert!(!from_end, "array subslices are never `from_end`");
let elem_layout = fx.layout_of(*elem_ty);
let ptr = cplace.to_ptr();
cplace = CPlace::for_ptr(
ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * (from as i64)),
fx.layout_of(Ty::new_array(fx.tcx, *elem_ty, to - from)),
);
}
ty::Slice(elem_ty) => {
assert!(from_end, "slice subslices should be `from_end`");
let elem_layout = fx.layout_of(*elem_ty);
let (ptr, len) = cplace.to_ptr_unsized();
cplace = CPlace::for_ptr_with_extra(
ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * (from as i64)),
fx.bcx.ins().iadd_imm(len, -(from as i64 + to as i64)),
cplace.layout(),
);
}
_ => unreachable!(),
}
}