forked from llvm/llvm-project
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathDebugInfo.cpp
1464 lines (1277 loc) · 54.8 KB
/
DebugInfo.cpp
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
//===- DebugInfo.cpp - Debug Information Helper Classes -------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the helper classes used to build and interpret debug
// information in LLVM IR form.
//
//===----------------------------------------------------------------------===//
#include "llvm-c/DebugInfo.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GVMaterializer.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Casting.h"
#include <algorithm>
#include <cassert>
#include <utility>
using namespace llvm;
using namespace llvm::dwarf;
DISubprogram *llvm::getDISubprogram(const MDNode *Scope) {
if (auto *LocalScope = dyn_cast_or_null<DILocalScope>(Scope))
return LocalScope->getSubprogram();
return nullptr;
}
//===----------------------------------------------------------------------===//
// DebugInfoFinder implementations.
//===----------------------------------------------------------------------===//
void DebugInfoFinder::reset() {
CUs.clear();
SPs.clear();
GVs.clear();
TYs.clear();
Scopes.clear();
NodesSeen.clear();
}
void DebugInfoFinder::processModule(const Module &M) {
for (auto *CU : M.debug_compile_units())
processCompileUnit(CU);
for (auto &F : M.functions()) {
if (auto *SP = cast_or_null<DISubprogram>(F.getSubprogram()))
processSubprogram(SP);
// There could be subprograms from inlined functions referenced from
// instructions only. Walk the function to find them.
for (const BasicBlock &BB : F)
for (const Instruction &I : BB)
processInstruction(M, I);
}
}
void DebugInfoFinder::processCompileUnit(DICompileUnit *CU) {
if (!addCompileUnit(CU))
return;
for (auto DIG : CU->getGlobalVariables()) {
if (!addGlobalVariable(DIG))
continue;
auto *GV = DIG->getVariable();
processScope(GV->getScope());
processType(GV->getType());
}
for (auto *ET : CU->getEnumTypes())
processType(ET);
for (auto *RT : CU->getRetainedTypes())
if (auto *T = dyn_cast<DIType>(RT))
processType(T);
else
processSubprogram(cast<DISubprogram>(RT));
for (auto *Import : CU->getImportedEntities()) {
auto *Entity = Import->getEntity();
if (auto *T = dyn_cast<DIType>(Entity))
processType(T);
else if (auto *SP = dyn_cast<DISubprogram>(Entity))
processSubprogram(SP);
else if (auto *NS = dyn_cast<DINamespace>(Entity))
processScope(NS->getScope());
else if (auto *M = dyn_cast<DIModule>(Entity))
processScope(M->getScope());
}
}
void DebugInfoFinder::processInstruction(const Module &M,
const Instruction &I) {
if (auto *DVI = dyn_cast<DbgVariableIntrinsic>(&I))
processVariable(M, *DVI);
if (auto DbgLoc = I.getDebugLoc())
processLocation(M, DbgLoc.get());
}
void DebugInfoFinder::processLocation(const Module &M, const DILocation *Loc) {
if (!Loc)
return;
processScope(Loc->getScope());
processLocation(M, Loc->getInlinedAt());
}
void DebugInfoFinder::processType(DIType *DT) {
if (!addType(DT))
return;
processScope(DT->getScope());
if (auto *ST = dyn_cast<DISubroutineType>(DT)) {
for (DIType *Ref : ST->getTypeArray())
processType(Ref);
return;
}
if (auto *DCT = dyn_cast<DICompositeType>(DT)) {
processType(DCT->getBaseType());
for (Metadata *D : DCT->getElements()) {
if (auto *T = dyn_cast<DIType>(D))
processType(T);
else if (auto *SP = dyn_cast<DISubprogram>(D))
processSubprogram(SP);
}
return;
}
if (auto *DDT = dyn_cast<DIDerivedType>(DT)) {
processType(DDT->getBaseType());
}
}
void DebugInfoFinder::processScope(DIScope *Scope) {
if (!Scope)
return;
if (auto *Ty = dyn_cast<DIType>(Scope)) {
processType(Ty);
return;
}
if (auto *CU = dyn_cast<DICompileUnit>(Scope)) {
addCompileUnit(CU);
return;
}
if (auto *SP = dyn_cast<DISubprogram>(Scope)) {
processSubprogram(SP);
return;
}
if (!addScope(Scope))
return;
if (auto *LB = dyn_cast<DILexicalBlockBase>(Scope)) {
processScope(LB->getScope());
} else if (auto *NS = dyn_cast<DINamespace>(Scope)) {
processScope(NS->getScope());
} else if (auto *M = dyn_cast<DIModule>(Scope)) {
processScope(M->getScope());
}
}
void DebugInfoFinder::processSubprogram(DISubprogram *SP) {
if (!addSubprogram(SP))
return;
processScope(SP->getScope());
// Some of the users, e.g. CloneFunctionInto / CloneModule, need to set up a
// ValueMap containing identity mappings for all of the DICompileUnit's, not
// just DISubprogram's, referenced from anywhere within the Function being
// cloned prior to calling MapMetadata / RemapInstruction to avoid their
// duplication later as DICompileUnit's are also directly referenced by
// llvm.dbg.cu list. Thefore we need to collect DICompileUnit's here as well.
// Also, DICompileUnit's may reference DISubprogram's too and therefore need
// to be at least looked through.
processCompileUnit(SP->getUnit());
processType(SP->getType());
for (auto *Element : SP->getTemplateParams()) {
if (auto *TType = dyn_cast<DITemplateTypeParameter>(Element)) {
processType(TType->getType());
} else if (auto *TVal = dyn_cast<DITemplateValueParameter>(Element)) {
processType(TVal->getType());
}
}
}
void DebugInfoFinder::processVariable(const Module &M,
const DbgVariableIntrinsic &DVI) {
auto *N = dyn_cast<MDNode>(DVI.getVariable());
if (!N)
return;
auto *DV = dyn_cast<DILocalVariable>(N);
if (!DV)
return;
if (!NodesSeen.insert(DV).second)
return;
processScope(DV->getScope());
processType(DV->getType());
}
bool DebugInfoFinder::addType(DIType *DT) {
if (!DT)
return false;
if (!NodesSeen.insert(DT).second)
return false;
TYs.push_back(const_cast<DIType *>(DT));
return true;
}
bool DebugInfoFinder::addCompileUnit(DICompileUnit *CU) {
if (!CU)
return false;
if (!NodesSeen.insert(CU).second)
return false;
CUs.push_back(CU);
return true;
}
bool DebugInfoFinder::addGlobalVariable(DIGlobalVariableExpression *DIG) {
if (!NodesSeen.insert(DIG).second)
return false;
GVs.push_back(DIG);
return true;
}
bool DebugInfoFinder::addSubprogram(DISubprogram *SP) {
if (!SP)
return false;
if (!NodesSeen.insert(SP).second)
return false;
SPs.push_back(SP);
return true;
}
bool DebugInfoFinder::addScope(DIScope *Scope) {
if (!Scope)
return false;
// FIXME: Ocaml binding generates a scope with no content, we treat it
// as null for now.
if (Scope->getNumOperands() == 0)
return false;
if (!NodesSeen.insert(Scope).second)
return false;
Scopes.push_back(Scope);
return true;
}
static MDNode *updateLoopMetadataDebugLocationsImpl(
MDNode *OrigLoopID,
function_ref<DILocation *(const DILocation &)> Updater) {
assert(OrigLoopID && OrigLoopID->getNumOperands() > 0 &&
"Loop ID needs at least one operand");
assert(OrigLoopID && OrigLoopID->getOperand(0).get() == OrigLoopID &&
"Loop ID should refer to itself");
// Save space for the self-referential LoopID.
SmallVector<Metadata *, 4> MDs = {nullptr};
for (unsigned i = 1; i < OrigLoopID->getNumOperands(); ++i) {
Metadata *MD = OrigLoopID->getOperand(i);
if (DILocation *DL = dyn_cast<DILocation>(MD)) {
if (DILocation *NewDL = Updater(*DL))
MDs.push_back(NewDL);
} else
MDs.push_back(MD);
}
MDNode *NewLoopID = MDNode::getDistinct(OrigLoopID->getContext(), MDs);
// Insert the self-referential LoopID.
NewLoopID->replaceOperandWith(0, NewLoopID);
return NewLoopID;
}
void llvm::updateLoopMetadataDebugLocations(
Instruction &I, function_ref<DILocation *(const DILocation &)> Updater) {
MDNode *OrigLoopID = I.getMetadata(LLVMContext::MD_loop);
if (!OrigLoopID)
return;
MDNode *NewLoopID = updateLoopMetadataDebugLocationsImpl(OrigLoopID, Updater);
I.setMetadata(LLVMContext::MD_loop, NewLoopID);
}
static MDNode *stripDebugLocFromLoopID(MDNode *N) {
assert(!N->operands().empty() && "Missing self reference?");
// if there is no debug location, we do not have to rewrite this MDNode.
if (std::none_of(N->op_begin() + 1, N->op_end(), [](const MDOperand &Op) {
return isa<DILocation>(Op.get());
}))
return N;
// If there is only the debug location without any actual loop metadata, we
// can remove the metadata.
if (std::none_of(N->op_begin() + 1, N->op_end(), [](const MDOperand &Op) {
return !isa<DILocation>(Op.get());
}))
return nullptr;
auto dropDebugLoc = [](const DILocation &) -> DILocation * {
return nullptr;
};
return updateLoopMetadataDebugLocationsImpl(N, dropDebugLoc);
}
bool llvm::stripDebugInfo(Function &F) {
bool Changed = false;
if (F.hasMetadata(LLVMContext::MD_dbg)) {
Changed = true;
F.setSubprogram(nullptr);
}
DenseMap<MDNode*, MDNode*> LoopIDsMap;
for (BasicBlock &BB : F) {
for (auto II = BB.begin(), End = BB.end(); II != End;) {
Instruction &I = *II++; // We may delete the instruction, increment now.
if (isa<DbgInfoIntrinsic>(&I)) {
I.eraseFromParent();
Changed = true;
continue;
}
if (I.getDebugLoc()) {
Changed = true;
I.setDebugLoc(DebugLoc());
}
}
auto *TermInst = BB.getTerminator();
if (!TermInst)
// This is invalid IR, but we may not have run the verifier yet
continue;
if (auto *LoopID = TermInst->getMetadata(LLVMContext::MD_loop)) {
auto *NewLoopID = LoopIDsMap.lookup(LoopID);
if (!NewLoopID)
NewLoopID = LoopIDsMap[LoopID] = stripDebugLocFromLoopID(LoopID);
if (NewLoopID != LoopID)
TermInst->setMetadata(LLVMContext::MD_loop, NewLoopID);
}
}
return Changed;
}
bool llvm::StripDebugInfo(Module &M) {
bool Changed = false;
for (Module::named_metadata_iterator NMI = M.named_metadata_begin(),
NME = M.named_metadata_end(); NMI != NME;) {
NamedMDNode *NMD = &*NMI;
++NMI;
// We're stripping debug info, and without them, coverage information
// doesn't quite make sense.
if (NMD->getName().startswith("llvm.dbg.") ||
NMD->getName() == "llvm.gcov") {
NMD->eraseFromParent();
Changed = true;
}
}
for (Function &F : M)
Changed |= stripDebugInfo(F);
for (auto &GV : M.globals()) {
Changed |= GV.eraseMetadata(LLVMContext::MD_dbg);
}
if (GVMaterializer *Materializer = M.getMaterializer())
Materializer->setStripDebugInfo();
return Changed;
}
namespace {
/// Helper class to downgrade -g metadata to -gline-tables-only metadata.
class DebugTypeInfoRemoval {
DenseMap<Metadata *, Metadata *> Replacements;
public:
/// The (void)() type.
MDNode *EmptySubroutineType;
private:
/// Remember what linkage name we originally had before stripping. If we end
/// up making two subprograms identical who originally had different linkage
/// names, then we need to make one of them distinct, to avoid them getting
/// uniqued. Maps the new node to the old linkage name.
DenseMap<DISubprogram *, StringRef> NewToLinkageName;
// TODO: Remember the distinct subprogram we created for a given linkage name,
// so that we can continue to unique whenever possible. Map <newly created
// node, old linkage name> to the first (possibly distinct) mdsubprogram
// created for that combination. This is not strictly needed for correctness,
// but can cut down on the number of MDNodes and let us diff cleanly with the
// output of -gline-tables-only.
public:
DebugTypeInfoRemoval(LLVMContext &C)
: EmptySubroutineType(DISubroutineType::get(C, DINode::FlagZero, 0,
MDNode::get(C, {}))) {}
Metadata *map(Metadata *M) {
if (!M)
return nullptr;
auto Replacement = Replacements.find(M);
if (Replacement != Replacements.end())
return Replacement->second;
return M;
}
MDNode *mapNode(Metadata *N) { return dyn_cast_or_null<MDNode>(map(N)); }
/// Recursively remap N and all its referenced children. Does a DF post-order
/// traversal, so as to remap bottoms up.
void traverseAndRemap(MDNode *N) { traverse(N); }
private:
// Create a new DISubprogram, to replace the one given.
DISubprogram *getReplacementSubprogram(DISubprogram *MDS) {
auto *FileAndScope = cast_or_null<DIFile>(map(MDS->getFile()));
StringRef LinkageName = MDS->getName().empty() ? MDS->getLinkageName() : "";
DISubprogram *Declaration = nullptr;
auto *Type = cast_or_null<DISubroutineType>(map(MDS->getType()));
DIType *ContainingType =
cast_or_null<DIType>(map(MDS->getContainingType()));
auto *Unit = cast_or_null<DICompileUnit>(map(MDS->getUnit()));
auto Variables = nullptr;
auto TemplateParams = nullptr;
// Make a distinct DISubprogram, for situations that warrent it.
auto distinctMDSubprogram = [&]() {
return DISubprogram::getDistinct(
MDS->getContext(), FileAndScope, MDS->getName(), LinkageName,
FileAndScope, MDS->getLine(), Type, MDS->getScopeLine(),
ContainingType, MDS->getVirtualIndex(), MDS->getThisAdjustment(),
MDS->getFlags(), MDS->getSPFlags(), Unit, TemplateParams, Declaration,
Variables);
};
if (MDS->isDistinct())
return distinctMDSubprogram();
auto *NewMDS = DISubprogram::get(
MDS->getContext(), FileAndScope, MDS->getName(), LinkageName,
FileAndScope, MDS->getLine(), Type, MDS->getScopeLine(), ContainingType,
MDS->getVirtualIndex(), MDS->getThisAdjustment(), MDS->getFlags(),
MDS->getSPFlags(), Unit, TemplateParams, Declaration, Variables);
StringRef OldLinkageName = MDS->getLinkageName();
// See if we need to make a distinct one.
auto OrigLinkage = NewToLinkageName.find(NewMDS);
if (OrigLinkage != NewToLinkageName.end()) {
if (OrigLinkage->second == OldLinkageName)
// We're good.
return NewMDS;
// Otherwise, need to make a distinct one.
// TODO: Query the map to see if we already have one.
return distinctMDSubprogram();
}
NewToLinkageName.insert({NewMDS, MDS->getLinkageName()});
return NewMDS;
}
/// Create a new compile unit, to replace the one given
DICompileUnit *getReplacementCU(DICompileUnit *CU) {
// Drop skeleton CUs.
if (CU->getDWOId())
return nullptr;
auto *File = cast_or_null<DIFile>(map(CU->getFile()));
MDTuple *EnumTypes = nullptr;
MDTuple *RetainedTypes = nullptr;
MDTuple *GlobalVariables = nullptr;
MDTuple *ImportedEntities = nullptr;
return DICompileUnit::getDistinct(
CU->getContext(), CU->getSourceLanguage(), File, CU->getProducer(),
CU->isOptimized(), CU->getFlags(), CU->getRuntimeVersion(),
CU->getSplitDebugFilename(), DICompileUnit::LineTablesOnly, EnumTypes,
RetainedTypes, GlobalVariables, ImportedEntities, CU->getMacros(),
CU->getDWOId(), CU->getSplitDebugInlining(),
CU->getDebugInfoForProfiling(), CU->getNameTableKind(),
CU->getRangesBaseAddress(), CU->getSysRoot(), CU->getSDK());
}
DILocation *getReplacementMDLocation(DILocation *MLD) {
auto *Scope = map(MLD->getScope());
auto *InlinedAt = map(MLD->getInlinedAt());
if (MLD->isDistinct())
return DILocation::getDistinct(MLD->getContext(), MLD->getLine(),
MLD->getColumn(), Scope, InlinedAt);
return DILocation::get(MLD->getContext(), MLD->getLine(), MLD->getColumn(),
Scope, InlinedAt);
}
/// Create a new generic MDNode, to replace the one given
MDNode *getReplacementMDNode(MDNode *N) {
SmallVector<Metadata *, 8> Ops;
Ops.reserve(N->getNumOperands());
for (auto &I : N->operands())
if (I)
Ops.push_back(map(I));
auto *Ret = MDNode::get(N->getContext(), Ops);
return Ret;
}
/// Attempt to re-map N to a newly created node.
void remap(MDNode *N) {
if (Replacements.count(N))
return;
auto doRemap = [&](MDNode *N) -> MDNode * {
if (!N)
return nullptr;
if (auto *MDSub = dyn_cast<DISubprogram>(N)) {
remap(MDSub->getUnit());
return getReplacementSubprogram(MDSub);
}
if (isa<DISubroutineType>(N))
return EmptySubroutineType;
if (auto *CU = dyn_cast<DICompileUnit>(N))
return getReplacementCU(CU);
if (isa<DIFile>(N))
return N;
if (auto *MDLB = dyn_cast<DILexicalBlockBase>(N))
// Remap to our referenced scope (recursively).
return mapNode(MDLB->getScope());
if (auto *MLD = dyn_cast<DILocation>(N))
return getReplacementMDLocation(MLD);
// Otherwise, if we see these, just drop them now. Not strictly necessary,
// but this speeds things up a little.
if (isa<DINode>(N))
return nullptr;
return getReplacementMDNode(N);
};
Replacements[N] = doRemap(N);
}
/// Do the remapping traversal.
void traverse(MDNode *);
};
} // end anonymous namespace
void DebugTypeInfoRemoval::traverse(MDNode *N) {
if (!N || Replacements.count(N))
return;
// To avoid cycles, as well as for efficiency sake, we will sometimes prune
// parts of the graph.
auto prune = [](MDNode *Parent, MDNode *Child) {
if (auto *MDS = dyn_cast<DISubprogram>(Parent))
return Child == MDS->getRetainedNodes().get();
return false;
};
SmallVector<MDNode *, 16> ToVisit;
DenseSet<MDNode *> Opened;
// Visit each node starting at N in post order, and map them.
ToVisit.push_back(N);
while (!ToVisit.empty()) {
auto *N = ToVisit.back();
if (!Opened.insert(N).second) {
// Close it.
remap(N);
ToVisit.pop_back();
continue;
}
for (auto &I : N->operands())
if (auto *MDN = dyn_cast_or_null<MDNode>(I))
if (!Opened.count(MDN) && !Replacements.count(MDN) && !prune(N, MDN) &&
!isa<DICompileUnit>(MDN))
ToVisit.push_back(MDN);
}
}
bool llvm::stripNonLineTableDebugInfo(Module &M) {
bool Changed = false;
// First off, delete the debug intrinsics.
auto RemoveUses = [&](StringRef Name) {
if (auto *DbgVal = M.getFunction(Name)) {
while (!DbgVal->use_empty())
cast<Instruction>(DbgVal->user_back())->eraseFromParent();
DbgVal->eraseFromParent();
Changed = true;
}
};
RemoveUses("llvm.dbg.addr");
RemoveUses("llvm.dbg.declare");
RemoveUses("llvm.dbg.label");
RemoveUses("llvm.dbg.value");
// Delete non-CU debug info named metadata nodes.
for (auto NMI = M.named_metadata_begin(), NME = M.named_metadata_end();
NMI != NME;) {
NamedMDNode *NMD = &*NMI;
++NMI;
// Specifically keep dbg.cu around.
if (NMD->getName() == "llvm.dbg.cu")
continue;
}
// Drop all dbg attachments from global variables.
for (auto &GV : M.globals())
GV.eraseMetadata(LLVMContext::MD_dbg);
DebugTypeInfoRemoval Mapper(M.getContext());
auto remap = [&](MDNode *Node) -> MDNode * {
if (!Node)
return nullptr;
Mapper.traverseAndRemap(Node);
auto *NewNode = Mapper.mapNode(Node);
Changed |= Node != NewNode;
Node = NewNode;
return NewNode;
};
// Rewrite the DebugLocs to be equivalent to what
// -gline-tables-only would have created.
for (auto &F : M) {
if (auto *SP = F.getSubprogram()) {
Mapper.traverseAndRemap(SP);
auto *NewSP = cast<DISubprogram>(Mapper.mapNode(SP));
Changed |= SP != NewSP;
F.setSubprogram(NewSP);
}
for (auto &BB : F) {
for (auto &I : BB) {
auto remapDebugLoc = [&](DebugLoc DL) -> DebugLoc {
auto *Scope = DL.getScope();
MDNode *InlinedAt = DL.getInlinedAt();
Scope = remap(Scope);
InlinedAt = remap(InlinedAt);
return DebugLoc::get(DL.getLine(), DL.getCol(), Scope, InlinedAt);
};
if (I.getDebugLoc() != DebugLoc())
I.setDebugLoc(remapDebugLoc(I.getDebugLoc()));
// Remap DILocations in untyped MDNodes (e.g., llvm.loop).
SmallVector<std::pair<unsigned, MDNode *>, 2> MDs;
I.getAllMetadata(MDs);
for (auto Attachment : MDs)
if (auto *T = dyn_cast_or_null<MDTuple>(Attachment.second))
for (unsigned N = 0; N < T->getNumOperands(); ++N)
if (auto *Loc = dyn_cast_or_null<DILocation>(T->getOperand(N)))
if (Loc != DebugLoc())
T->replaceOperandWith(N, remapDebugLoc(Loc));
}
}
}
// Create a new llvm.dbg.cu, which is equivalent to the one
// -gline-tables-only would have created.
for (auto &NMD : M.getNamedMDList()) {
SmallVector<MDNode *, 8> Ops;
for (MDNode *Op : NMD.operands())
Ops.push_back(remap(Op));
if (!Changed)
continue;
NMD.clearOperands();
for (auto *Op : Ops)
if (Op)
NMD.addOperand(Op);
}
return Changed;
}
unsigned llvm::getDebugMetadataVersionFromModule(const Module &M) {
if (auto *Val = mdconst::dyn_extract_or_null<ConstantInt>(
M.getModuleFlag("Debug Info Version")))
return Val->getZExtValue();
return 0;
}
void Instruction::applyMergedLocation(const DILocation *LocA,
const DILocation *LocB) {
setDebugLoc(DILocation::getMergedLocation(LocA, LocB));
}
//===----------------------------------------------------------------------===//
// LLVM C API implementations.
//===----------------------------------------------------------------------===//
static unsigned map_from_llvmDWARFsourcelanguage(LLVMDWARFSourceLanguage lang) {
switch (lang) {
#define HANDLE_DW_LANG(ID, NAME, LOWER_BOUND, VERSION, VENDOR) \
case LLVMDWARFSourceLanguage##NAME: \
return ID;
#include "llvm/BinaryFormat/Dwarf.def"
#undef HANDLE_DW_LANG
}
llvm_unreachable("Unhandled Tag");
}
template <typename DIT> DIT *unwrapDI(LLVMMetadataRef Ref) {
return (DIT *)(Ref ? unwrap<MDNode>(Ref) : nullptr);
}
static DINode::DIFlags map_from_llvmDIFlags(LLVMDIFlags Flags) {
return static_cast<DINode::DIFlags>(Flags);
}
static LLVMDIFlags map_to_llvmDIFlags(DINode::DIFlags Flags) {
return static_cast<LLVMDIFlags>(Flags);
}
static DISubprogram::DISPFlags
pack_into_DISPFlags(bool IsLocalToUnit, bool IsDefinition, bool IsOptimized) {
return DISubprogram::toSPFlags(IsLocalToUnit, IsDefinition, IsOptimized);
}
unsigned LLVMDebugMetadataVersion() {
return DEBUG_METADATA_VERSION;
}
LLVMDIBuilderRef LLVMCreateDIBuilderDisallowUnresolved(LLVMModuleRef M) {
return wrap(new DIBuilder(*unwrap(M), false));
}
LLVMDIBuilderRef LLVMCreateDIBuilder(LLVMModuleRef M) {
return wrap(new DIBuilder(*unwrap(M)));
}
unsigned LLVMGetModuleDebugMetadataVersion(LLVMModuleRef M) {
return getDebugMetadataVersionFromModule(*unwrap(M));
}
LLVMBool LLVMStripModuleDebugInfo(LLVMModuleRef M) {
return StripDebugInfo(*unwrap(M));
}
void LLVMDisposeDIBuilder(LLVMDIBuilderRef Builder) {
delete unwrap(Builder);
}
void LLVMDIBuilderFinalize(LLVMDIBuilderRef Builder) {
unwrap(Builder)->finalize();
}
LLVMMetadataRef LLVMDIBuilderCreateCompileUnit(
LLVMDIBuilderRef Builder, LLVMDWARFSourceLanguage Lang,
LLVMMetadataRef FileRef, const char *Producer, size_t ProducerLen,
LLVMBool isOptimized, const char *Flags, size_t FlagsLen,
unsigned RuntimeVer, const char *SplitName, size_t SplitNameLen,
LLVMDWARFEmissionKind Kind, unsigned DWOId, LLVMBool SplitDebugInlining,
LLVMBool DebugInfoForProfiling, const char *SysRoot, size_t SysRootLen,
const char *SDK, size_t SDKLen) {
auto File = unwrapDI<DIFile>(FileRef);
return wrap(unwrap(Builder)->createCompileUnit(
map_from_llvmDWARFsourcelanguage(Lang), File,
StringRef(Producer, ProducerLen), isOptimized, StringRef(Flags, FlagsLen),
RuntimeVer, StringRef(SplitName, SplitNameLen),
static_cast<DICompileUnit::DebugEmissionKind>(Kind), DWOId,
SplitDebugInlining, DebugInfoForProfiling,
DICompileUnit::DebugNameTableKind::Default, false,
StringRef(SysRoot, SysRootLen), StringRef(SDK, SDKLen)));
}
LLVMMetadataRef
LLVMDIBuilderCreateFile(LLVMDIBuilderRef Builder, const char *Filename,
size_t FilenameLen, const char *Directory,
size_t DirectoryLen) {
return wrap(unwrap(Builder)->createFile(StringRef(Filename, FilenameLen),
StringRef(Directory, DirectoryLen)));
}
LLVMMetadataRef
LLVMDIBuilderCreateModule(LLVMDIBuilderRef Builder, LLVMMetadataRef ParentScope,
const char *Name, size_t NameLen,
const char *ConfigMacros, size_t ConfigMacrosLen,
const char *IncludePath, size_t IncludePathLen,
const char *APINotesFile, size_t APINotesFileLen) {
return wrap(unwrap(Builder)->createModule(
unwrapDI<DIScope>(ParentScope), StringRef(Name, NameLen),
StringRef(ConfigMacros, ConfigMacrosLen),
StringRef(IncludePath, IncludePathLen),
StringRef(APINotesFile, APINotesFileLen)));
}
LLVMMetadataRef LLVMDIBuilderCreateNameSpace(LLVMDIBuilderRef Builder,
LLVMMetadataRef ParentScope,
const char *Name, size_t NameLen,
LLVMBool ExportSymbols) {
return wrap(unwrap(Builder)->createNameSpace(
unwrapDI<DIScope>(ParentScope), StringRef(Name, NameLen), ExportSymbols));
}
LLVMMetadataRef LLVMDIBuilderCreateFunction(
LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
size_t NameLen, const char *LinkageName, size_t LinkageNameLen,
LLVMMetadataRef File, unsigned LineNo, LLVMMetadataRef Ty,
LLVMBool IsLocalToUnit, LLVMBool IsDefinition,
unsigned ScopeLine, LLVMDIFlags Flags, LLVMBool IsOptimized) {
return wrap(unwrap(Builder)->createFunction(
unwrapDI<DIScope>(Scope), {Name, NameLen}, {LinkageName, LinkageNameLen},
unwrapDI<DIFile>(File), LineNo, unwrapDI<DISubroutineType>(Ty), ScopeLine,
map_from_llvmDIFlags(Flags),
pack_into_DISPFlags(IsLocalToUnit, IsDefinition, IsOptimized), nullptr,
nullptr, nullptr));
}
LLVMMetadataRef LLVMDIBuilderCreateLexicalBlock(
LLVMDIBuilderRef Builder, LLVMMetadataRef Scope,
LLVMMetadataRef File, unsigned Line, unsigned Col) {
return wrap(unwrap(Builder)->createLexicalBlock(unwrapDI<DIScope>(Scope),
unwrapDI<DIFile>(File),
Line, Col));
}
LLVMMetadataRef
LLVMDIBuilderCreateLexicalBlockFile(LLVMDIBuilderRef Builder,
LLVMMetadataRef Scope,
LLVMMetadataRef File,
unsigned Discriminator) {
return wrap(unwrap(Builder)->createLexicalBlockFile(unwrapDI<DIScope>(Scope),
unwrapDI<DIFile>(File),
Discriminator));
}
LLVMMetadataRef
LLVMDIBuilderCreateImportedModuleFromNamespace(LLVMDIBuilderRef Builder,
LLVMMetadataRef Scope,
LLVMMetadataRef NS,
LLVMMetadataRef File,
unsigned Line) {
return wrap(unwrap(Builder)->createImportedModule(unwrapDI<DIScope>(Scope),
unwrapDI<DINamespace>(NS),
unwrapDI<DIFile>(File),
Line));
}
LLVMMetadataRef
LLVMDIBuilderCreateImportedModuleFromAlias(LLVMDIBuilderRef Builder,
LLVMMetadataRef Scope,
LLVMMetadataRef ImportedEntity,
LLVMMetadataRef File,
unsigned Line) {
return wrap(unwrap(Builder)->createImportedModule(
unwrapDI<DIScope>(Scope),
unwrapDI<DIImportedEntity>(ImportedEntity),
unwrapDI<DIFile>(File), Line));
}
LLVMMetadataRef
LLVMDIBuilderCreateImportedModuleFromModule(LLVMDIBuilderRef Builder,
LLVMMetadataRef Scope,
LLVMMetadataRef M,
LLVMMetadataRef File,
unsigned Line) {
return wrap(unwrap(Builder)->createImportedModule(unwrapDI<DIScope>(Scope),
unwrapDI<DIModule>(M),
unwrapDI<DIFile>(File),
Line));
}
LLVMMetadataRef
LLVMDIBuilderCreateImportedDeclaration(LLVMDIBuilderRef Builder,
LLVMMetadataRef Scope,
LLVMMetadataRef Decl,
LLVMMetadataRef File,
unsigned Line,
const char *Name, size_t NameLen) {
return wrap(unwrap(Builder)->createImportedDeclaration(
unwrapDI<DIScope>(Scope),
unwrapDI<DINode>(Decl),
unwrapDI<DIFile>(File), Line, {Name, NameLen}));
}
LLVMMetadataRef
LLVMDIBuilderCreateDebugLocation(LLVMContextRef Ctx, unsigned Line,
unsigned Column, LLVMMetadataRef Scope,
LLVMMetadataRef InlinedAt) {
return wrap(DILocation::get(*unwrap(Ctx), Line, Column, unwrap(Scope),
unwrap(InlinedAt)));
}
unsigned LLVMDILocationGetLine(LLVMMetadataRef Location) {
return unwrapDI<DILocation>(Location)->getLine();
}
unsigned LLVMDILocationGetColumn(LLVMMetadataRef Location) {
return unwrapDI<DILocation>(Location)->getColumn();
}
LLVMMetadataRef LLVMDILocationGetScope(LLVMMetadataRef Location) {
return wrap(unwrapDI<DILocation>(Location)->getScope());
}
LLVMMetadataRef LLVMDILocationGetInlinedAt(LLVMMetadataRef Location) {
return wrap(unwrapDI<DILocation>(Location)->getInlinedAt());
}
LLVMMetadataRef LLVMDIScopeGetFile(LLVMMetadataRef Scope) {
return wrap(unwrapDI<DIScope>(Scope)->getFile());
}
const char *LLVMDIFileGetDirectory(LLVMMetadataRef File, unsigned *Len) {
auto Dir = unwrapDI<DIFile>(File)->getDirectory();
*Len = Dir.size();
return Dir.data();
}
const char *LLVMDIFileGetFilename(LLVMMetadataRef File, unsigned *Len) {
auto Name = unwrapDI<DIFile>(File)->getFilename();
*Len = Name.size();
return Name.data();
}
const char *LLVMDIFileGetSource(LLVMMetadataRef File, unsigned *Len) {
if (auto Src = unwrapDI<DIFile>(File)->getSource()) {
*Len = Src->size();
return Src->data();
}
*Len = 0;
return "";
}
LLVMMetadataRef LLVMDIBuilderCreateMacro(LLVMDIBuilderRef Builder,
LLVMMetadataRef ParentMacroFile,
unsigned Line,
LLVMDWARFMacinfoRecordType RecordType,
const char *Name, size_t NameLen,
const char *Value, size_t ValueLen) {
return wrap(
unwrap(Builder)->createMacro(unwrapDI<DIMacroFile>(ParentMacroFile), Line,
static_cast<MacinfoRecordType>(RecordType),
{Name, NameLen}, {Value, ValueLen}));
}
LLVMMetadataRef
LLVMDIBuilderCreateTempMacroFile(LLVMDIBuilderRef Builder,
LLVMMetadataRef ParentMacroFile, unsigned Line,
LLVMMetadataRef File) {
return wrap(unwrap(Builder)->createTempMacroFile(
unwrapDI<DIMacroFile>(ParentMacroFile), Line, unwrapDI<DIFile>(File)));
}
LLVMMetadataRef LLVMDIBuilderCreateEnumerator(LLVMDIBuilderRef Builder,
const char *Name, size_t NameLen,
int64_t Value,
LLVMBool IsUnsigned) {
return wrap(unwrap(Builder)->createEnumerator({Name, NameLen}, Value,
IsUnsigned != 0));
}
LLVMMetadataRef LLVMDIBuilderCreateEnumerationType(
LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
uint64_t SizeInBits, uint32_t AlignInBits, LLVMMetadataRef *Elements,
unsigned NumElements, LLVMMetadataRef ClassTy) {
auto Elts = unwrap(Builder)->getOrCreateArray({unwrap(Elements),
NumElements});
return wrap(unwrap(Builder)->createEnumerationType(
unwrapDI<DIScope>(Scope), {Name, NameLen}, unwrapDI<DIFile>(File),
LineNumber, SizeInBits, AlignInBits, Elts, unwrapDI<DIType>(ClassTy)));
}
LLVMMetadataRef LLVMDIBuilderCreateUnionType(
LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
uint64_t SizeInBits, uint32_t AlignInBits, LLVMDIFlags Flags,
LLVMMetadataRef *Elements, unsigned NumElements, unsigned RunTimeLang,
const char *UniqueId, size_t UniqueIdLen) {
auto Elts = unwrap(Builder)->getOrCreateArray({unwrap(Elements),
NumElements});
return wrap(unwrap(Builder)->createUnionType(
unwrapDI<DIScope>(Scope), {Name, NameLen}, unwrapDI<DIFile>(File),
LineNumber, SizeInBits, AlignInBits, map_from_llvmDIFlags(Flags),
Elts, RunTimeLang, {UniqueId, UniqueIdLen}));
}
LLVMMetadataRef
LLVMDIBuilderCreateArrayType(LLVMDIBuilderRef Builder, uint64_t Size,