/
ValueObject.cpp
3390 lines (2976 loc) · 117 KB
/
ValueObject.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
//===-- ValueObject.cpp ---------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "lldb/Core/ValueObject.h"
#include "lldb/Core/Address.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ValueObjectCast.h"
#include "lldb/Core/ValueObjectChild.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "lldb/Core/ValueObjectDynamicValue.h"
#include "lldb/Core/ValueObjectMemory.h"
#include "lldb/Core/ValueObjectSyntheticFilter.h"
#include "lldb/DataFormatters/DataVisualization.h"
#include "lldb/DataFormatters/DumpValueObjectOptions.h"
#include "lldb/DataFormatters/FormatManager.h"
#include "lldb/DataFormatters/StringPrinter.h"
#include "lldb/DataFormatters/TypeFormat.h"
#include "lldb/DataFormatters/TypeSummary.h"
#include "lldb/DataFormatters/ValueObjectPrinter.h"
#include "lldb/Expression/ExpressionVariable.h"
#include "lldb/Host/Config.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Symbol/Declaration.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Symbol/Type.h"
#include "lldb/Symbol/Variable.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Language.h"
#include "lldb/Target/LanguageRuntime.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadList.h"
#include "lldb/Utility/DataBuffer.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/Flags.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/Logging.h"
#include "lldb/Utility/Scalar.h"
#include "lldb/Utility/Stream.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/lldb-private-types.h"
#include "llvm/Support/Compiler.h"
#include <algorithm>
#include <cstdint>
#include <cstdlib>
#include <memory>
#include <tuple>
#include <assert.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
namespace lldb_private {
class ExecutionContextScope;
}
namespace lldb_private {
class SymbolContextScope;
}
using namespace lldb;
using namespace lldb_private;
static user_id_t g_value_obj_uid = 0;
// ValueObject constructor
ValueObject::ValueObject(ValueObject &parent)
: UserID(++g_value_obj_uid), // Unique identifier for every value object
m_parent(&parent), m_root(nullptr),
m_update_point(parent.GetUpdatePoint()), m_name(), m_data(), m_value(),
m_error(), m_value_str(), m_old_value_str(), m_location_str(),
m_summary_str(), m_object_desc_str(), m_manager(parent.GetManager()),
m_children(), m_synthetic_children(), m_dynamic_value(nullptr),
m_synthetic_value(nullptr), m_deref_valobj(nullptr),
m_format(eFormatDefault), m_last_format(eFormatDefault),
m_last_format_mgr_revision(0), m_type_summary_sp(), m_type_format_sp(),
m_synthetic_children_sp(), m_user_id_of_forced_summary(),
m_address_type_of_ptr_or_ref_children(eAddressTypeInvalid),
m_value_checksum(),
m_preferred_display_language(lldb::eLanguageTypeUnknown),
m_language_flags(0), m_value_is_valid(false), m_value_did_change(false),
m_children_count_valid(false), m_old_value_valid(false),
m_is_deref_of_parent(false), m_is_array_item_for_pointer(false),
m_is_bitfield_for_scalar(false), m_is_child_at_offset(false),
m_is_getting_summary(false),
m_did_calculate_complete_objc_class_type(false),
m_is_synthetic_children_generated(
parent.m_is_synthetic_children_generated) {
m_data.SetByteOrder(parent.GetDataExtractor().GetByteOrder());
m_data.SetAddressByteSize(parent.GetDataExtractor().GetAddressByteSize());
m_manager->ManageObject(this);
}
// ValueObject constructor
ValueObject::ValueObject(ExecutionContextScope *exe_scope,
ValueObjectManager &manager,
AddressType child_ptr_or_ref_addr_type)
: UserID(++g_value_obj_uid), // Unique identifier for every value object
m_parent(nullptr), m_root(nullptr), m_update_point(exe_scope), m_name(),
m_data(), m_value(), m_error(), m_value_str(), m_old_value_str(),
m_location_str(), m_summary_str(), m_object_desc_str(),
m_manager(&manager), m_children(), m_synthetic_children(),
m_dynamic_value(nullptr), m_synthetic_value(nullptr),
m_deref_valobj(nullptr), m_format(eFormatDefault),
m_last_format(eFormatDefault), m_last_format_mgr_revision(0),
m_type_summary_sp(), m_type_format_sp(), m_synthetic_children_sp(),
m_user_id_of_forced_summary(),
m_address_type_of_ptr_or_ref_children(child_ptr_or_ref_addr_type),
m_value_checksum(),
m_preferred_display_language(lldb::eLanguageTypeUnknown),
m_language_flags(0), m_value_is_valid(false), m_value_did_change(false),
m_children_count_valid(false), m_old_value_valid(false),
m_is_deref_of_parent(false), m_is_array_item_for_pointer(false),
m_is_bitfield_for_scalar(false), m_is_child_at_offset(false),
m_is_getting_summary(false),
m_did_calculate_complete_objc_class_type(false),
m_is_synthetic_children_generated(false) {
if (exe_scope) {
TargetSP target_sp(exe_scope->CalculateTarget());
if (target_sp) {
const ArchSpec &arch = target_sp->GetArchitecture();
m_data.SetByteOrder(arch.GetByteOrder());
m_data.SetAddressByteSize(arch.GetAddressByteSize());
}
}
m_manager->ManageObject(this);
}
// Destructor
ValueObject::~ValueObject() {}
void ValueObject::UpdateChildrenAddressType() {
Value::ValueType value_type = m_value.GetValueType();
ExecutionContext exe_ctx(GetExecutionContextRef());
Process *process = exe_ctx.GetProcessPtr();
const bool process_is_alive = process && process->IsAlive();
const uint32_t type_info = GetCompilerType().GetTypeInfo();
const bool is_pointer_or_ref =
(type_info & (lldb::eTypeIsPointer | lldb::eTypeIsReference)) != 0;
switch (value_type) {
case Value::eValueTypeFileAddress:
// If this type is a pointer, then its children will be considered load
// addresses if the pointer or reference is dereferenced, but only if
// the process is alive.
//
// There could be global variables like in the following code:
// struct LinkedListNode { Foo* foo; LinkedListNode* next; };
// Foo g_foo1;
// Foo g_foo2;
// LinkedListNode g_second_node = { &g_foo2, NULL };
// LinkedListNode g_first_node = { &g_foo1, &g_second_node };
//
// When we aren't running, we should be able to look at these variables
// using the "target variable" command. Children of the "g_first_node"
// always will be of the same address type as the parent. But children
// of the "next" member of LinkedListNode will become load addresses if
// we have a live process, or remain a file address if it was a file
// address.
if (process_is_alive && is_pointer_or_ref)
SetAddressTypeOfChildren(eAddressTypeLoad);
else
SetAddressTypeOfChildren(eAddressTypeFile);
break;
case Value::eValueTypeHostAddress:
// Same as above for load addresses, except children of pointer or refs
// are always load addresses. Host addresses are used to store freeze
// dried variables. If this type is a struct, the entire struct
// contents will be copied into the heap of the
// LLDB process, but we do not currently follow any pointers.
if (is_pointer_or_ref)
SetAddressTypeOfChildren(eAddressTypeLoad);
else
SetAddressTypeOfChildren(eAddressTypeHost);
break;
case Value::eValueTypeLoadAddress:
case Value::eValueTypeScalar:
case Value::eValueTypeVector:
SetAddressTypeOfChildren(eAddressTypeLoad);
break;
}
}
bool ValueObject::UpdateValueIfNeeded(bool update_format) {
bool did_change_formats = false;
if (update_format)
did_change_formats = UpdateFormatsIfNeeded();
// If this is a constant value, then our success is predicated on whether we
// have an error or not
if (GetIsConstant()) {
// if you are constant, things might still have changed behind your back
// (e.g. you are a frozen object and things have changed deeper than you
// cared to freeze-dry yourself) in this case, your value has not changed,
// but "computed" entries might have, so you might now have a different
// summary, or a different object description. clear these so we will
// recompute them
if (update_format && !did_change_formats)
ClearUserVisibleData(eClearUserVisibleDataItemsSummary |
eClearUserVisibleDataItemsDescription);
return m_error.Success();
}
bool first_update = IsChecksumEmpty();
if (NeedsUpdating()) {
m_update_point.SetUpdated();
// Save the old value using swap to avoid a string copy which also will
// clear our m_value_str
if (m_value_str.empty()) {
m_old_value_valid = false;
} else {
m_old_value_valid = true;
m_old_value_str.swap(m_value_str);
ClearUserVisibleData(eClearUserVisibleDataItemsValue);
}
ClearUserVisibleData();
if (IsInScope()) {
const bool value_was_valid = GetValueIsValid();
SetValueDidChange(false);
m_error.Clear();
// Call the pure virtual function to update the value
bool need_compare_checksums = false;
llvm::SmallVector<uint8_t, 16> old_checksum;
if (!first_update && CanProvideValue()) {
need_compare_checksums = true;
old_checksum.resize(m_value_checksum.size());
std::copy(m_value_checksum.begin(), m_value_checksum.end(),
old_checksum.begin());
}
bool success = UpdateValue();
SetValueIsValid(success);
if (success) {
UpdateChildrenAddressType();
const uint64_t max_checksum_size = 128;
m_data.Checksum(m_value_checksum, max_checksum_size);
} else {
need_compare_checksums = false;
m_value_checksum.clear();
}
assert(!need_compare_checksums ||
(!old_checksum.empty() && !m_value_checksum.empty()));
if (first_update)
SetValueDidChange(false);
else if (!m_value_did_change && !success) {
// The value wasn't gotten successfully, so we mark this as changed if
// the value used to be valid and now isn't
SetValueDidChange(value_was_valid);
} else if (need_compare_checksums) {
SetValueDidChange(memcmp(&old_checksum[0], &m_value_checksum[0],
m_value_checksum.size()));
}
} else {
m_error.SetErrorString("out of scope");
}
}
return m_error.Success();
}
bool ValueObject::UpdateFormatsIfNeeded() {
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_DATAFORMATTERS));
LLDB_LOGF(log,
"[%s %p] checking for FormatManager revisions. ValueObject "
"rev: %d - Global rev: %d",
GetName().GetCString(), static_cast<void *>(this),
m_last_format_mgr_revision,
DataVisualization::GetCurrentRevision());
bool any_change = false;
if ((m_last_format_mgr_revision != DataVisualization::GetCurrentRevision())) {
m_last_format_mgr_revision = DataVisualization::GetCurrentRevision();
any_change = true;
SetValueFormat(DataVisualization::GetFormat(*this, eNoDynamicValues));
SetSummaryFormat(
DataVisualization::GetSummaryFormat(*this, GetDynamicValueType()));
#if LLDB_ENABLE_PYTHON
SetSyntheticChildren(
DataVisualization::GetSyntheticChildren(*this, GetDynamicValueType()));
#endif
}
return any_change;
}
void ValueObject::SetNeedsUpdate() {
m_update_point.SetNeedsUpdate();
// We have to clear the value string here so ConstResult children will notice
// if their values are changed by hand (i.e. with SetValueAsCString).
ClearUserVisibleData(eClearUserVisibleDataItemsValue);
}
void ValueObject::ClearDynamicTypeInformation() {
m_children_count_valid = false;
m_did_calculate_complete_objc_class_type = false;
m_last_format_mgr_revision = 0;
m_override_type = CompilerType();
SetValueFormat(lldb::TypeFormatImplSP());
SetSummaryFormat(lldb::TypeSummaryImplSP());
SetSyntheticChildren(lldb::SyntheticChildrenSP());
}
CompilerType ValueObject::MaybeCalculateCompleteType() {
CompilerType compiler_type(GetCompilerTypeImpl());
if (m_did_calculate_complete_objc_class_type) {
if (m_override_type.IsValid())
return m_override_type;
else
return compiler_type;
}
m_did_calculate_complete_objc_class_type = true;
ProcessSP process_sp(
GetUpdatePoint().GetExecutionContextRef().GetProcessSP());
if (!process_sp)
return compiler_type;
if (auto *runtime =
process_sp->GetLanguageRuntime(GetObjectRuntimeLanguage())) {
if (llvm::Optional<CompilerType> complete_type =
runtime->GetRuntimeType(compiler_type)) {
m_override_type = complete_type.getValue();
if (m_override_type.IsValid())
return m_override_type;
}
}
return compiler_type;
}
CompilerType ValueObject::GetCompilerType() {
return MaybeCalculateCompleteType();
}
TypeImpl ValueObject::GetTypeImpl() { return TypeImpl(GetCompilerType()); }
DataExtractor &ValueObject::GetDataExtractor() {
UpdateValueIfNeeded(false);
return m_data;
}
const Status &ValueObject::GetError() {
UpdateValueIfNeeded(false);
return m_error;
}
ConstString ValueObject::GetName() const { return m_name; }
const char *ValueObject::GetLocationAsCString() {
return GetLocationAsCStringImpl(m_value, m_data);
}
const char *ValueObject::GetLocationAsCStringImpl(const Value &value,
const DataExtractor &data) {
if (UpdateValueIfNeeded(false)) {
if (m_location_str.empty()) {
StreamString sstr;
Value::ValueType value_type = value.GetValueType();
switch (value_type) {
case Value::eValueTypeScalar:
case Value::eValueTypeVector:
if (value.GetContextType() == Value::eContextTypeRegisterInfo) {
RegisterInfo *reg_info = value.GetRegisterInfo();
if (reg_info) {
if (reg_info->name)
m_location_str = reg_info->name;
else if (reg_info->alt_name)
m_location_str = reg_info->alt_name;
if (m_location_str.empty())
m_location_str = (reg_info->encoding == lldb::eEncodingVector)
? "vector"
: "scalar";
}
}
if (m_location_str.empty())
m_location_str =
(value_type == Value::eValueTypeVector) ? "vector" : "scalar";
break;
case Value::eValueTypeLoadAddress:
case Value::eValueTypeFileAddress:
case Value::eValueTypeHostAddress: {
uint32_t addr_nibble_size = data.GetAddressByteSize() * 2;
sstr.Printf("0x%*.*llx", addr_nibble_size, addr_nibble_size,
value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS));
m_location_str = std::string(sstr.GetString());
} break;
}
}
}
return m_location_str.c_str();
}
Value &ValueObject::GetValue() { return m_value; }
const Value &ValueObject::GetValue() const { return m_value; }
bool ValueObject::ResolveValue(Scalar &scalar) {
if (UpdateValueIfNeeded(
false)) // make sure that you are up to date before returning anything
{
ExecutionContext exe_ctx(GetExecutionContextRef());
Value tmp_value(m_value);
scalar = tmp_value.ResolveValue(&exe_ctx);
if (scalar.IsValid()) {
const uint32_t bitfield_bit_size = GetBitfieldBitSize();
if (bitfield_bit_size)
return scalar.ExtractBitfield(bitfield_bit_size,
GetBitfieldBitOffset());
return true;
}
}
return false;
}
bool ValueObject::IsLogicalTrue(Status &error) {
if (Language *language = Language::FindPlugin(GetObjectRuntimeLanguage())) {
LazyBool is_logical_true = language->IsLogicalTrue(*this, error);
switch (is_logical_true) {
case eLazyBoolYes:
case eLazyBoolNo:
return (is_logical_true == true);
case eLazyBoolCalculate:
break;
}
}
Scalar scalar_value;
if (!ResolveValue(scalar_value)) {
error.SetErrorString("failed to get a scalar result");
return false;
}
bool ret;
ret = scalar_value.ULongLong(1) != 0;
error.Clear();
return ret;
}
bool ValueObject::GetValueIsValid() const { return m_value_is_valid; }
void ValueObject::SetValueIsValid(bool b) { m_value_is_valid = b; }
bool ValueObject::GetValueDidChange() { return m_value_did_change; }
void ValueObject::SetValueDidChange(bool value_changed) {
m_value_did_change = value_changed;
}
ValueObjectSP ValueObject::GetChildAtIndex(size_t idx, bool can_create) {
ValueObjectSP child_sp;
// We may need to update our value if we are dynamic
if (IsPossibleDynamicType())
UpdateValueIfNeeded(false);
if (idx < GetNumChildren()) {
// Check if we have already made the child value object?
if (can_create && !m_children.HasChildAtIndex(idx)) {
// No we haven't created the child at this index, so lets have our
// subclass do it and cache the result for quick future access.
m_children.SetChildAtIndex(idx, CreateChildAtIndex(idx, false, 0));
}
ValueObject *child = m_children.GetChildAtIndex(idx);
if (child != nullptr)
return child->GetSP();
}
return child_sp;
}
lldb::ValueObjectSP
ValueObject::GetChildAtIndexPath(llvm::ArrayRef<size_t> idxs,
size_t *index_of_error) {
if (idxs.size() == 0)
return GetSP();
ValueObjectSP root(GetSP());
for (size_t idx : idxs) {
root = root->GetChildAtIndex(idx, true);
if (!root) {
if (index_of_error)
*index_of_error = idx;
return root;
}
}
return root;
}
lldb::ValueObjectSP ValueObject::GetChildAtIndexPath(
llvm::ArrayRef<std::pair<size_t, bool>> idxs, size_t *index_of_error) {
if (idxs.size() == 0)
return GetSP();
ValueObjectSP root(GetSP());
for (std::pair<size_t, bool> idx : idxs) {
root = root->GetChildAtIndex(idx.first, idx.second);
if (!root) {
if (index_of_error)
*index_of_error = idx.first;
return root;
}
}
return root;
}
lldb::ValueObjectSP
ValueObject::GetChildAtNamePath(llvm::ArrayRef<ConstString> names,
ConstString *name_of_error) {
if (names.size() == 0)
return GetSP();
ValueObjectSP root(GetSP());
for (ConstString name : names) {
root = root->GetChildMemberWithName(name, true);
if (!root) {
if (name_of_error)
*name_of_error = name;
return root;
}
}
return root;
}
lldb::ValueObjectSP ValueObject::GetChildAtNamePath(
llvm::ArrayRef<std::pair<ConstString, bool>> names,
ConstString *name_of_error) {
if (names.size() == 0)
return GetSP();
ValueObjectSP root(GetSP());
for (std::pair<ConstString, bool> name : names) {
root = root->GetChildMemberWithName(name.first, name.second);
if (!root) {
if (name_of_error)
*name_of_error = name.first;
return root;
}
}
return root;
}
size_t ValueObject::GetIndexOfChildWithName(ConstString name) {
bool omit_empty_base_classes = true;
return GetCompilerType().GetIndexOfChildWithName(name.GetCString(),
omit_empty_base_classes);
}
ValueObjectSP ValueObject::GetChildMemberWithName(ConstString name,
bool can_create) {
// when getting a child by name, it could be buried inside some base classes
// (which really aren't part of the expression path), so we need a vector of
// indexes that can get us down to the correct child
ValueObjectSP child_sp;
// We may need to update our value if we are dynamic
if (IsPossibleDynamicType())
UpdateValueIfNeeded(false);
std::vector<uint32_t> child_indexes;
bool omit_empty_base_classes = true;
if (!GetCompilerType().IsValid())
return ValueObjectSP();
const size_t num_child_indexes =
GetCompilerType().GetIndexOfChildMemberWithName(
name.GetCString(), omit_empty_base_classes, child_indexes);
if (num_child_indexes > 0) {
std::vector<uint32_t>::const_iterator pos = child_indexes.begin();
std::vector<uint32_t>::const_iterator end = child_indexes.end();
child_sp = GetChildAtIndex(*pos, can_create);
for (++pos; pos != end; ++pos) {
if (child_sp) {
ValueObjectSP new_child_sp(child_sp->GetChildAtIndex(*pos, can_create));
child_sp = new_child_sp;
} else {
child_sp.reset();
}
}
}
return child_sp;
}
size_t ValueObject::GetNumChildren(uint32_t max) {
UpdateValueIfNeeded();
if (max < UINT32_MAX) {
if (m_children_count_valid) {
size_t children_count = m_children.GetChildrenCount();
return children_count <= max ? children_count : max;
} else
return CalculateNumChildren(max);
}
if (!m_children_count_valid) {
SetNumChildren(CalculateNumChildren());
}
return m_children.GetChildrenCount();
}
bool ValueObject::MightHaveChildren() {
bool has_children = false;
const uint32_t type_info = GetTypeInfo();
if (type_info) {
if (type_info & (eTypeHasChildren | eTypeIsPointer | eTypeIsReference))
has_children = true;
} else {
has_children = GetNumChildren() > 0;
}
return has_children;
}
// Should only be called by ValueObject::GetNumChildren()
void ValueObject::SetNumChildren(size_t num_children) {
m_children_count_valid = true;
m_children.SetChildrenCount(num_children);
}
void ValueObject::SetName(ConstString name) { m_name = name; }
ValueObject *ValueObject::CreateChildAtIndex(size_t idx,
bool synthetic_array_member,
int32_t synthetic_index) {
ValueObject *valobj = nullptr;
bool omit_empty_base_classes = true;
bool ignore_array_bounds = synthetic_array_member;
std::string child_name_str;
uint32_t child_byte_size = 0;
int32_t child_byte_offset = 0;
uint32_t child_bitfield_bit_size = 0;
uint32_t child_bitfield_bit_offset = 0;
bool child_is_base_class = false;
bool child_is_deref_of_parent = false;
uint64_t language_flags = 0;
const bool transparent_pointers = !synthetic_array_member;
CompilerType child_compiler_type;
ExecutionContext exe_ctx(GetExecutionContextRef());
child_compiler_type = GetCompilerType().GetChildCompilerTypeAtIndex(
&exe_ctx, idx, transparent_pointers, omit_empty_base_classes,
ignore_array_bounds, child_name_str, child_byte_size, child_byte_offset,
child_bitfield_bit_size, child_bitfield_bit_offset, child_is_base_class,
child_is_deref_of_parent, this, language_flags);
if (child_compiler_type) {
if (synthetic_index)
child_byte_offset += child_byte_size * synthetic_index;
ConstString child_name;
if (!child_name_str.empty())
child_name.SetCString(child_name_str.c_str());
valobj = new ValueObjectChild(
*this, child_compiler_type, child_name, child_byte_size,
child_byte_offset, child_bitfield_bit_size, child_bitfield_bit_offset,
child_is_base_class, child_is_deref_of_parent, eAddressTypeInvalid,
language_flags);
}
return valobj;
}
bool ValueObject::GetSummaryAsCString(TypeSummaryImpl *summary_ptr,
std::string &destination,
lldb::LanguageType lang) {
return GetSummaryAsCString(summary_ptr, destination,
TypeSummaryOptions().SetLanguage(lang));
}
bool ValueObject::GetSummaryAsCString(TypeSummaryImpl *summary_ptr,
std::string &destination,
const TypeSummaryOptions &options) {
destination.clear();
// ideally we would like to bail out if passing NULL, but if we do so we end
// up not providing the summary for function pointers anymore
if (/*summary_ptr == NULL ||*/ m_is_getting_summary)
return false;
m_is_getting_summary = true;
TypeSummaryOptions actual_options(options);
if (actual_options.GetLanguage() == lldb::eLanguageTypeUnknown)
actual_options.SetLanguage(GetPreferredDisplayLanguage());
// this is a hot path in code and we prefer to avoid setting this string all
// too often also clearing out other information that we might care to see in
// a crash log. might be useful in very specific situations though.
/*Host::SetCrashDescriptionWithFormat("Trying to fetch a summary for %s %s.
Summary provider's description is %s",
GetTypeName().GetCString(),
GetName().GetCString(),
summary_ptr->GetDescription().c_str());*/
if (UpdateValueIfNeeded(false) && summary_ptr) {
if (HasSyntheticValue())
m_synthetic_value->UpdateValueIfNeeded(); // the summary might depend on
// the synthetic children being
// up-to-date (e.g. ${svar%#})
summary_ptr->FormatObject(this, destination, actual_options);
}
m_is_getting_summary = false;
return !destination.empty();
}
const char *ValueObject::GetSummaryAsCString(lldb::LanguageType lang) {
if (UpdateValueIfNeeded(true) && m_summary_str.empty()) {
TypeSummaryOptions summary_options;
summary_options.SetLanguage(lang);
GetSummaryAsCString(GetSummaryFormat().get(), m_summary_str,
summary_options);
}
if (m_summary_str.empty())
return nullptr;
return m_summary_str.c_str();
}
bool ValueObject::GetSummaryAsCString(std::string &destination,
const TypeSummaryOptions &options) {
return GetSummaryAsCString(GetSummaryFormat().get(), destination, options);
}
bool ValueObject::IsCStringContainer(bool check_pointer) {
CompilerType pointee_or_element_compiler_type;
const Flags type_flags(GetTypeInfo(&pointee_or_element_compiler_type));
bool is_char_arr_ptr(type_flags.AnySet(eTypeIsArray | eTypeIsPointer) &&
pointee_or_element_compiler_type.IsCharType());
if (!is_char_arr_ptr)
return false;
if (!check_pointer)
return true;
if (type_flags.Test(eTypeIsArray))
return true;
addr_t cstr_address = LLDB_INVALID_ADDRESS;
AddressType cstr_address_type = eAddressTypeInvalid;
cstr_address = GetPointerValue(&cstr_address_type);
return (cstr_address != LLDB_INVALID_ADDRESS);
}
size_t ValueObject::GetPointeeData(DataExtractor &data, uint32_t item_idx,
uint32_t item_count) {
CompilerType pointee_or_element_compiler_type;
const uint32_t type_info = GetTypeInfo(&pointee_or_element_compiler_type);
const bool is_pointer_type = type_info & eTypeIsPointer;
const bool is_array_type = type_info & eTypeIsArray;
if (!(is_pointer_type || is_array_type))
return 0;
if (item_count == 0)
return 0;
ExecutionContext exe_ctx(GetExecutionContextRef());
llvm::Optional<uint64_t> item_type_size =
pointee_or_element_compiler_type.GetByteSize(
exe_ctx.GetBestExecutionContextScope());
if (!item_type_size)
return 0;
const uint64_t bytes = item_count * *item_type_size;
const uint64_t offset = item_idx * *item_type_size;
if (item_idx == 0 && item_count == 1) // simply a deref
{
if (is_pointer_type) {
Status error;
ValueObjectSP pointee_sp = Dereference(error);
if (error.Fail() || pointee_sp.get() == nullptr)
return 0;
return pointee_sp->GetData(data, error);
} else {
ValueObjectSP child_sp = GetChildAtIndex(0, true);
if (child_sp.get() == nullptr)
return 0;
Status error;
return child_sp->GetData(data, error);
}
return true;
} else /* (items > 1) */
{
Status error;
lldb_private::DataBufferHeap *heap_buf_ptr = nullptr;
lldb::DataBufferSP data_sp(heap_buf_ptr =
new lldb_private::DataBufferHeap());
AddressType addr_type;
lldb::addr_t addr = is_pointer_type ? GetPointerValue(&addr_type)
: GetAddressOf(true, &addr_type);
switch (addr_type) {
case eAddressTypeFile: {
ModuleSP module_sp(GetModule());
if (module_sp) {
addr = addr + offset;
Address so_addr;
module_sp->ResolveFileAddress(addr, so_addr);
ExecutionContext exe_ctx(GetExecutionContextRef());
Target *target = exe_ctx.GetTargetPtr();
if (target) {
heap_buf_ptr->SetByteSize(bytes);
size_t bytes_read = target->ReadMemory(
so_addr, false, heap_buf_ptr->GetBytes(), bytes, error);
if (error.Success()) {
data.SetData(data_sp);
return bytes_read;
}
}
}
} break;
case eAddressTypeLoad: {
ExecutionContext exe_ctx(GetExecutionContextRef());
Process *process = exe_ctx.GetProcessPtr();
if (process) {
heap_buf_ptr->SetByteSize(bytes);
size_t bytes_read = process->ReadMemory(
addr + offset, heap_buf_ptr->GetBytes(), bytes, error);
if (error.Success() || bytes_read > 0) {
data.SetData(data_sp);
return bytes_read;
}
}
} break;
case eAddressTypeHost: {
auto max_bytes =
GetCompilerType().GetByteSize(exe_ctx.GetBestExecutionContextScope());
if (max_bytes && *max_bytes > offset) {
size_t bytes_read = std::min<uint64_t>(*max_bytes - offset, bytes);
addr = m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
if (addr == 0 || addr == LLDB_INVALID_ADDRESS)
break;
heap_buf_ptr->CopyData((uint8_t *)(addr + offset), bytes_read);
data.SetData(data_sp);
return bytes_read;
}
} break;
case eAddressTypeInvalid:
break;
}
}
return 0;
}
uint64_t ValueObject::GetData(DataExtractor &data, Status &error) {
UpdateValueIfNeeded(false);
ExecutionContext exe_ctx(GetExecutionContextRef());
error = m_value.GetValueAsData(&exe_ctx, data, GetModule().get());
if (error.Fail()) {
if (m_data.GetByteSize()) {
data = m_data;
error.Clear();
return data.GetByteSize();
} else {
return 0;
}
}
data.SetAddressByteSize(m_data.GetAddressByteSize());
data.SetByteOrder(m_data.GetByteOrder());
return data.GetByteSize();
}
bool ValueObject::SetData(DataExtractor &data, Status &error) {
error.Clear();
// Make sure our value is up to date first so that our location and location
// type is valid.
if (!UpdateValueIfNeeded(false)) {
error.SetErrorString("unable to read value");
return false;
}
uint64_t count = 0;
const Encoding encoding = GetCompilerType().GetEncoding(count);
const size_t byte_size = GetByteSize();
Value::ValueType value_type = m_value.GetValueType();
switch (value_type) {
case Value::eValueTypeScalar: {
Status set_error =
m_value.GetScalar().SetValueFromData(data, encoding, byte_size);
if (!set_error.Success()) {
error.SetErrorStringWithFormat("unable to set scalar value: %s",
set_error.AsCString());
return false;
}
} break;
case Value::eValueTypeLoadAddress: {
// If it is a load address, then the scalar value is the storage location
// of the data, and we have to shove this value down to that load location.
ExecutionContext exe_ctx(GetExecutionContextRef());
Process *process = exe_ctx.GetProcessPtr();
if (process) {
addr_t target_addr = m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
size_t bytes_written = process->WriteMemory(
target_addr, data.GetDataStart(), byte_size, error);
if (!error.Success())
return false;
if (bytes_written != byte_size) {
error.SetErrorString("unable to write value to memory");
return false;
}
}
} break;
case Value::eValueTypeHostAddress: {
// If it is a host address, then we stuff the scalar as a DataBuffer into
// the Value's data.
DataBufferSP buffer_sp(new DataBufferHeap(byte_size, 0));
m_data.SetData(buffer_sp, 0);
data.CopyByteOrderedData(0, byte_size,
const_cast<uint8_t *>(m_data.GetDataStart()),
byte_size, m_data.GetByteOrder());
m_value.GetScalar() = (uintptr_t)m_data.GetDataStart();
} break;
case Value::eValueTypeFileAddress:
case Value::eValueTypeVector:
break;
}
// If we have reached this point, then we have successfully changed the
// value.
SetNeedsUpdate();
return true;
}
static bool CopyStringDataToBufferSP(const StreamString &source,
lldb::DataBufferSP &destination) {
destination = std::make_shared<DataBufferHeap>(source.GetSize() + 1, 0);
memcpy(destination->GetBytes(), source.GetString().data(), source.GetSize());
return true;
}
std::pair<size_t, bool>
ValueObject::ReadPointedString(lldb::DataBufferSP &buffer_sp, Status &error,
uint32_t max_length, bool honor_array,
Format item_format) {
bool was_capped = false;
StreamString s;
ExecutionContext exe_ctx(GetExecutionContextRef());
Target *target = exe_ctx.GetTargetPtr();
if (!target) {
s << "<no target to read from>";
error.SetErrorString("no target to read from");
CopyStringDataToBufferSP(s, buffer_sp);
return {0, was_capped};
}
if (max_length == 0)
max_length = target->GetMaximumSizeOfStringSummary();
size_t bytes_read = 0;
size_t total_bytes_read = 0;
CompilerType compiler_type = GetCompilerType();
CompilerType elem_or_pointee_compiler_type;
const Flags type_flags(GetTypeInfo(&elem_or_pointee_compiler_type));
if (type_flags.AnySet(eTypeIsArray | eTypeIsPointer) &&
elem_or_pointee_compiler_type.IsCharType()) {
addr_t cstr_address = LLDB_INVALID_ADDRESS;
AddressType cstr_address_type = eAddressTypeInvalid;
size_t cstr_len = 0;
bool capped_data = false;
const bool is_array = type_flags.Test(eTypeIsArray);
if (is_array) {
// We have an array
uint64_t array_size = 0;
if (compiler_type.IsArrayType(nullptr, &array_size, nullptr)) {
cstr_len = array_size;