-
Notifications
You must be signed in to change notification settings - Fork 4.7k
/
classlayoutinfo.cpp
1219 lines (1054 loc) · 45.1 KB
/
classlayoutinfo.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
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
#include "common.h"
#include "class.h"
#include "fieldmarshaler.h"
#ifndef DACCESS_COMPILE
namespace
{
void SetOffsetsAndSortFields(
IMDInternalImport* pInternalImport,
const mdTypeDef cl,
LayoutRawFieldInfo* pFieldInfoArray,
const ULONG cInstanceFields,
const BOOL fExplicitOffsets,
const UINT32 cbAdjustedParentLayoutNativeSize,
Module* pModule,
LayoutRawFieldInfo** pSortArrayOut
)
{
HRESULT hr;
MD_CLASS_LAYOUT classlayout;
hr = pInternalImport->GetClassLayoutInit(cl, &classlayout);
if (FAILED(hr))
{
COMPlusThrowHR(hr, BFA_CANT_GET_CLASSLAYOUT);
}
LayoutRawFieldInfo* pfwalk = pFieldInfoArray;
mdFieldDef fd;
ULONG ulOffset;
while (SUCCEEDED(hr = pInternalImport->GetClassLayoutNext(
&classlayout,
&fd,
&ulOffset)) &&
fd != mdFieldDefNil)
{
// watch for the last entry: must be mdFieldDefNil
while ((mdFieldDefNil != pfwalk->m_MD) && (pfwalk->m_MD < fd))
pfwalk++;
// if we haven't found a matching token, it must be a static field with layout -- ignore it
if (pfwalk->m_MD != fd) continue;
if (!fExplicitOffsets)
{
// ulOffset is the sequence
pfwalk->m_sequence = ulOffset;
}
else
{
// ulOffset is the explicit offset
pfwalk->m_placement.m_offset = ulOffset;
pfwalk->m_sequence = (ULONG)-1;
// Treat base class as an initial member.
if (!ClrSafeInt<UINT32>::addition(pfwalk->m_placement.m_offset, cbAdjustedParentLayoutNativeSize, pfwalk->m_placement.m_offset))
COMPlusThrowOM();
}
}
IfFailThrow(hr);
LayoutRawFieldInfo** pSortArrayEnd = pSortArrayOut;
// now sort the array
if (!fExplicitOffsets)
{
// sort sequential by ascending sequence
for (ULONG i = 0; i < cInstanceFields; i++)
{
LayoutRawFieldInfo** pSortWalk = pSortArrayEnd;
while (pSortWalk != pSortArrayOut)
{
if (pFieldInfoArray[i].m_sequence >= (*(pSortWalk - 1))->m_sequence)
break;
pSortWalk--;
}
// pSortWalk now points to the target location for new LayoutRawFieldInfo*.
MoveMemory(pSortWalk + 1, pSortWalk, (pSortArrayEnd - pSortWalk) * sizeof(LayoutRawFieldInfo*));
*pSortWalk = &pFieldInfoArray[i];
pSortArrayEnd++;
}
}
else // no sorting for explicit layout
{
for (ULONG i = 0; i < cInstanceFields; i++)
{
if (pFieldInfoArray[i].m_MD != mdFieldDefNil)
{
if (pFieldInfoArray[i].m_placement.m_offset == (UINT32)-1)
{
LPCUTF8 szFieldName;
if (FAILED(pInternalImport->GetNameOfFieldDef(pFieldInfoArray[i].m_MD, &szFieldName)))
{
szFieldName = "Invalid FieldDef record";
}
pModule->GetAssembly()->ThrowTypeLoadException(pInternalImport,
cl,
szFieldName,
IDS_CLASSLOAD_NSTRUCT_EXPLICIT_OFFSET);
}
else if ((INT)pFieldInfoArray[i].m_placement.m_offset < 0)
{
LPCUTF8 szFieldName;
if (FAILED(pInternalImport->GetNameOfFieldDef(pFieldInfoArray[i].m_MD, &szFieldName)))
{
szFieldName = "Invalid FieldDef record";
}
pModule->GetAssembly()->ThrowTypeLoadException(pInternalImport,
cl,
szFieldName,
IDS_CLASSLOAD_NSTRUCT_NEGATIVE_OFFSET);
}
}
*pSortArrayEnd = &pFieldInfoArray[i];
pSortArrayEnd++;
}
}
}
void CalculateSizeAndFieldOffsets(
const UINT32 parentSize,
ULONG numInstanceFields,
BOOL fExplicitOffsets,
LayoutRawFieldInfo* const* pSortedFieldInfoArray, // An array of pointers to LayoutRawFieldInfo's in ascending order when sequential layout.
ULONG classSizeInMetadata,
BYTE packingSize,
BYTE parentAlignmentRequirement,
BOOL limitToMaxInteropSize,
BYTE* pLargestAlignmentRequirementOut,
UINT32* pSizeOut
)
{
UINT32 cbCurOffset = parentSize;
BYTE LargestAlignmentRequirement = max<BYTE>(1, min(packingSize, parentAlignmentRequirement));
// Start with the size inherited from the parent (if any).
uint32_t calcTotalSize = parentSize;
LayoutRawFieldInfo* const* pSortWalk;
ULONG i;
for (pSortWalk = pSortedFieldInfoArray, i = numInstanceFields; i; i--, pSortWalk++)
{
LayoutRawFieldInfo* pfwalk = *pSortWalk;
RawFieldPlacementInfo* placementInfo = &pfwalk->m_placement;
BYTE alignmentRequirement = (BYTE)placementInfo->m_alignment;
alignmentRequirement = min(alignmentRequirement, packingSize);
LargestAlignmentRequirement = max(LargestAlignmentRequirement, alignmentRequirement);
switch (alignmentRequirement)
{
case 1:
case 2:
case 4:
case 8:
case 16:
case 32:
case 64:
break;
default:
COMPlusThrowHR(COR_E_INVALIDPROGRAM, BFA_METADATA_CORRUPT);
}
if (!fExplicitOffsets)
{
// Insert enough padding to align the current data member.
while (cbCurOffset % alignmentRequirement)
{
if (!ClrSafeInt<UINT32>::addition(cbCurOffset, 1, cbCurOffset))
COMPlusThrowOM();
}
// if we overflow we will catch it below
placementInfo->m_offset = cbCurOffset;
cbCurOffset += placementInfo->m_size;
}
uint32_t fieldEnd = placementInfo->m_offset + placementInfo->m_size;
if (fieldEnd < placementInfo->m_offset)
COMPlusThrowOM();
// size of the structure is the size of the last field.
if (fieldEnd > calcTotalSize)
calcTotalSize = fieldEnd;
}
if (classSizeInMetadata != 0)
{
ULONG classSize;
if (!ClrSafeInt<ULONG>::addition(classSizeInMetadata, (ULONG)parentSize, classSize))
COMPlusThrowOM();
// size must be large enough to accommodate layout. If not, we use the layout size instead.
calcTotalSize = max((uint32_t)classSize, calcTotalSize);
}
else
{
// There was no class size given in metadata, so let's round up to a multiple of the alignment requirement
// to make array allocations of this structure simple to keep aligned.
calcTotalSize += (LargestAlignmentRequirement - calcTotalSize % LargestAlignmentRequirement) % LargestAlignmentRequirement;
if (calcTotalSize % LargestAlignmentRequirement != 0)
{
if (!ClrSafeInt<uint32_t>::addition(calcTotalSize, LargestAlignmentRequirement - (calcTotalSize % LargestAlignmentRequirement), calcTotalSize))
COMPlusThrowOM();
}
}
// We'll cap the total native size at a (somewhat) arbitrary limit to ensure
// that we don't expose some overflow bug later on.
if (calcTotalSize >= MAX_SIZE_FOR_INTEROP && limitToMaxInteropSize)
COMPlusThrowOM();
// The packingSize acts as a ceiling on all individual alignment
// requirements so it follows that the largest alignment requirement
// is also capped.
_ASSERTE(LargestAlignmentRequirement <= packingSize);
*pSizeOut = calcTotalSize;
*pLargestAlignmentRequirementOut = LargestAlignmentRequirement;
}
RawFieldPlacementInfo GetFieldPlacementInfo(CorElementType corElemType, TypeHandle pNestedType)
{
RawFieldPlacementInfo placementInfo;
// Initialize offset to a dummy value as we set it to the correct value later.
placementInfo.m_offset = (UINT32)-1;
placementInfo.m_size = TARGET_POINTER_SIZE;
placementInfo.m_alignment = TARGET_POINTER_SIZE;
// This type may qualify for ManagedSequential. Collect managed size and alignment info.
if (CorTypeInfo::IsPrimitiveType(corElemType))
{
// Safe cast - no primitive type is larger than 4gb!
placementInfo.m_size = ((UINT32)CorTypeInfo::Size(corElemType));
#if defined(TARGET_X86) && defined(UNIX_X86_ABI)
switch (corElemType)
{
// The System V ABI for i386 defines different packing for these types.
case ELEMENT_TYPE_I8:
case ELEMENT_TYPE_U8:
case ELEMENT_TYPE_R8:
{
placementInfo.m_alignment = 4;
break;
}
default:
{
placementInfo.m_alignment = placementInfo.m_size;
break;
}
}
#else // TARGET_X86 && UNIX_X86_ABI
placementInfo.m_alignment = placementInfo.m_size;
#endif
}
else if (corElemType == ELEMENT_TYPE_PTR || corElemType == ELEMENT_TYPE_FNPTR)
{
placementInfo.m_size = TARGET_POINTER_SIZE;
placementInfo.m_alignment = TARGET_POINTER_SIZE;
}
else if (corElemType == ELEMENT_TYPE_VALUETYPE)
{
_ASSERTE(!pNestedType.IsNull());
placementInfo.m_size = (pNestedType.GetMethodTable()->GetNumInstanceFieldBytes());
#if !defined(TARGET_64BIT) && (DATA_ALIGNMENT > 4)
if (placementInfo.m_size >= DATA_ALIGNMENT)
{
placementInfo.m_alignment = DATA_ALIGNMENT;
}
else
#elif defined(FEATURE_64BIT_ALIGNMENT)
if (pNestedType.RequiresAlign8())
{
placementInfo.m_alignment = 8;
}
else
#endif // FEATURE_64BIT_ALIGNMENT
if (pNestedType.GetMethodTable()->ContainsGCPointers())
{
// this field type has GC pointers in it, which need to be pointer-size aligned
placementInfo.m_alignment = TARGET_POINTER_SIZE;
}
else
{
placementInfo.m_alignment = pNestedType.GetMethodTable()->GetFieldAlignmentRequirement();
}
}
// No other type permitted for ManagedSequential.
return placementInfo;
}
BOOL TypeHasGCPointers(CorElementType corElemType, TypeHandle pNestedType)
{
if (CorTypeInfo::IsPrimitiveType(corElemType) || corElemType == ELEMENT_TYPE_PTR || corElemType == ELEMENT_TYPE_FNPTR ||
corElemType == ELEMENT_TYPE_BYREF)
{
return FALSE;
}
if (corElemType == ELEMENT_TYPE_VALUETYPE)
{
_ASSERTE(!pNestedType.IsNull());
return pNestedType.GetMethodTable()->ContainsGCPointers() != FALSE;
}
return TRUE;
}
BOOL TypeHasAutoLayoutField(CorElementType corElemType, TypeHandle pNestedType)
{
if (CorTypeInfo::IsPrimitiveType(corElemType) || corElemType == ELEMENT_TYPE_PTR || corElemType == ELEMENT_TYPE_FNPTR)
{
return FALSE;
}
if (corElemType == ELEMENT_TYPE_VALUETYPE)
{
_ASSERTE(!pNestedType.IsNull());
return pNestedType.IsEnum() || pNestedType.GetMethodTable()->IsAutoLayoutOrHasAutoLayoutField();
}
return FALSE;
}
BOOL TypeHasInt128Field(CorElementType corElemType, TypeHandle pNestedType)
{
if (corElemType == ELEMENT_TYPE_VALUETYPE)
{
_ASSERTE(!pNestedType.IsNull());
return pNestedType.GetMethodTable()->IsInt128OrHasInt128Fields();
}
return FALSE;
}
#ifdef UNIX_AMD64_ABI
void SystemVAmd64CheckForPassNativeStructInRegister(MethodTable* pMT, EEClassNativeLayoutInfo* pNativeLayoutInfo)
{
STANDARD_VM_CONTRACT;
DWORD totalStructSize = 0;
// If not a native value type, return.
if (!pMT->IsValueType())
{
return;
}
totalStructSize = pNativeLayoutInfo->GetSize();
// If num of bytes for the fields is bigger than CLR_SYSTEMV_MAX_STRUCT_BYTES_TO_PASS_IN_REGISTERS
// pass through stack
if (totalStructSize > CLR_SYSTEMV_MAX_STRUCT_BYTES_TO_PASS_IN_REGISTERS)
{
LOG((LF_JIT, LL_EVERYTHING, "**** SystemVAmd64CheckForPassNativeStructInRegister: struct %s is too big to pass in registers (%d bytes)\n",
pMT->GetDebugClassName(), totalStructSize));
return;
}
_ASSERTE(pMT->HasLayout());
// Iterate through the fields and make sure they meet requirements to pass in registers
SystemVStructRegisterPassingHelper helper((unsigned int)totalStructSize);
if (pMT->ClassifyEightBytesWithNativeLayout(&helper, 0, 0, pNativeLayoutInfo))
{
pNativeLayoutInfo->SetNativeStructPassedInRegisters();
}
}
#endif // UNIX_AMD64_ABI
//=====================================================================
// ParseNativeFieldTypes:
// Figure out the native field type of each field based on both the CLR
// signature of the field and the FieldMarshaler metadata.
//=====================================================================
void ParseFieldNativeTypes(
IMDInternalImport* pInternalImport,
const mdTypeDef cl,
ApproxFieldDescIterator fieldDescs,
Module* pModule,
ParseNativeTypeFlags nativeTypeFlags,
const SigTypeContext* pTypeContext,
LayoutRawFieldInfo* pFieldInfoArrayOut
#ifdef _DEBUG
,
LPCUTF8 szNamespace,
LPCUTF8 szName
#endif
)
{
HRESULT hr;
for (int i = 0; i < fieldDescs.Count(); i++, pFieldInfoArrayOut++)
{
DWORD dwFieldAttrs;
FieldDesc* pFieldDesc = fieldDescs.Next();
mdFieldDef fd = pFieldDesc->GetMemberDef();
IfFailThrow(pInternalImport->GetFieldDefProps(fd, &dwFieldAttrs));
PCCOR_SIGNATURE pNativeType = NULL;
ULONG cbNativeType;
if (IsFdHasFieldMarshal(dwFieldAttrs))
{
hr = pInternalImport->GetFieldMarshal(fd, &pNativeType, &cbNativeType);
if (FAILED(hr))
{
cbNativeType = 0;
}
}
else
{
cbNativeType = 0;
}
PCCOR_SIGNATURE pCOMSignature;
ULONG cbCOMSignature;
pFieldDesc->GetSig(&pCOMSignature, &cbCOMSignature);
// fill the appropriate entry in pInfoArray
pFieldInfoArrayOut->m_MD = fd;
pFieldInfoArrayOut->m_placement.m_offset = (UINT32)-1;
pFieldInfoArrayOut->m_sequence = 0;
#ifdef _DEBUG
LPCUTF8 szFieldName;
if (FAILED(pInternalImport->GetNameOfFieldDef(fd, &szFieldName)))
{
szFieldName = "Invalid FieldDef record";
}
#endif
MetaSig fsig(pCOMSignature, cbCOMSignature, pModule, pTypeContext, MetaSig::sigField);
fsig.NextArg();
ParseNativeType(pModule,
fsig.GetArgProps(),
pFieldDesc,
nativeTypeFlags,
&pFieldInfoArrayOut->m_nfd,
pTypeContext
#ifdef _DEBUG
,
szNamespace,
szName,
szFieldName
#endif
);
}
// NULL out the last entry
pFieldInfoArrayOut->m_MD = mdFieldDefNil;
}
void DetermineBlittabilityAndManagedSequential(
IMDInternalImport* pInternalImport,
HENUMInternal* phEnumField,
Module* pModule,
mdTypeDef cl,
ParseNativeTypeFlags nativeTypeFlags,
const SigTypeContext* pTypeContext,
BOOL* fDisqualifyFromManagedSequential,
BOOL* fHasAutoLayoutField,
BOOL* fHasInt128Field,
LayoutRawFieldInfo* pFieldInfoArrayOut,
BOOL* pIsBlittableOut,
ULONG* cInstanceFields
#ifdef _DEBUG
,
const ULONG cTotalFields,
LPCUTF8 szNamespace,
LPCUTF8 szName
#endif
)
{
STANDARD_VM_CONTRACT;
HRESULT hr;
mdFieldDef fd;
ULONG maxRid = pInternalImport->GetCountWithTokenKind(mdtFieldDef);
*pIsBlittableOut = TRUE; // Assume is blittable until proven otherwise.
ULONG i;
for (i = 0; pInternalImport->EnumNext(phEnumField, &fd); i++)
{
DWORD dwFieldAttrs;
ULONG rid = RidFromToken(fd);
if ((rid == 0) || (rid > maxRid))
{
COMPlusThrowHR(COR_E_TYPELOAD, BFA_BAD_FIELD_TOKEN);
}
IfFailThrow(pInternalImport->GetFieldDefProps(fd, &dwFieldAttrs));
PCCOR_SIGNATURE pNativeType = NULL;
ULONG cbNativeType;
// We ignore marshaling data attached to statics and literals,
// since these do not contribute to instance data.
if (!IsFdStatic(dwFieldAttrs) && !IsFdLiteral(dwFieldAttrs))
{
PCCOR_SIGNATURE pCOMSignature;
ULONG cbCOMSignature;
if (IsFdHasFieldMarshal(dwFieldAttrs))
{
hr = pInternalImport->GetFieldMarshal(fd, &pNativeType, &cbNativeType);
if (FAILED(hr))
{
cbNativeType = 0;
}
}
else
{
cbNativeType = 0;
}
IfFailThrow(pInternalImport->GetSigOfFieldDef(fd, &cbCOMSignature, &pCOMSignature));
IfFailThrow(::validateTokenSig(fd, pCOMSignature, cbCOMSignature, dwFieldAttrs, pInternalImport));
// fill the appropriate entry in pInfoArray
pFieldInfoArrayOut->m_MD = fd;
pFieldInfoArrayOut->m_sequence = 0;
#ifdef _DEBUG
LPCUTF8 szFieldName;
if (FAILED(pInternalImport->GetNameOfFieldDef(fd, &szFieldName)))
{
szFieldName = "Invalid FieldDef record";
}
#endif
MetaSig fsig(pCOMSignature, cbCOMSignature, pModule, pTypeContext, MetaSig::sigField);
CorElementType corElemType = fsig.NextArg();
TypeHandle typeHandleMaybe;
if (corElemType == ELEMENT_TYPE_VALUETYPE) // Only look up the next element in the signature if it is a value type to avoid causing recursive type loads in valid scenarios.
{
SigPointer::HandleRecursiveGenericsForFieldLayoutLoad recursiveControl;
recursiveControl.pModuleWithTokenToAvoidIfPossible = pModule;
recursiveControl.tkTypeDefToAvoidIfPossible = cl;
typeHandleMaybe = fsig.GetArgProps().GetTypeHandleThrowing(pModule,
pTypeContext,
ClassLoader::LoadTypes,
CLASS_LOAD_APPROXPARENTS,
TRUE, NULL, NULL, NULL,
&recursiveControl);
if (typeHandleMaybe.IsNull())
{
// Everett C++ compiler can generate a TypeRef with RS=0
// without respective TypeDef for unmanaged valuetypes,
// referenced only by pointers to them.
// In such case, GetTypeHandleThrowing returns null handle,
// and we return E_T_VOID
typeHandleMaybe = TypeHandle(CoreLibBinder::GetElementType(ELEMENT_TYPE_VOID));
}
corElemType = typeHandleMaybe.AsMethodTable()->GetInternalCorElementType();
if (corElemType != ELEMENT_TYPE_VALUETYPE)
typeHandleMaybe = TypeHandle();
}
else if (corElemType == ELEMENT_TYPE_TYPEDBYREF)
{
typeHandleMaybe = TypeHandle(g_TypedReferenceMT);
}
pFieldInfoArrayOut->m_placement = GetFieldPlacementInfo(corElemType, typeHandleMaybe);
*fDisqualifyFromManagedSequential |= TypeHasGCPointers(corElemType, typeHandleMaybe);
*fHasAutoLayoutField |= TypeHasAutoLayoutField(corElemType, typeHandleMaybe);
*fHasInt128Field |= TypeHasInt128Field(corElemType, typeHandleMaybe);
if (!IsFieldBlittable(pModule, fd, corElemType, typeHandleMaybe, nativeTypeFlags))
*pIsBlittableOut = FALSE;
(*cInstanceFields)++;
pFieldInfoArrayOut++;
}
}
_ASSERTE(i == cTotalFields);
// NULL out the last entry
pFieldInfoArrayOut->m_MD = mdFieldDefNil;
}
#ifdef FEATURE_HFA
//
// The managed and unmanaged views of the types can differ for non-blitable types. This method
// mirrors the HFA type computation for the unmanaged view.
//
void CheckForNativeHFA(MethodTable* pMT, EEClassNativeLayoutInfo* pNativeLayoutInfo)
{
STANDARD_VM_CONTRACT;
// No HFAs with inheritance
if (!(pMT->IsValueType() || (pMT->GetParentMethodTable() == g_pObjectClass)))
return;
// No HFAs with explicit layout. There may be cases where explicit layout may be still
// eligible for HFA, but it is hard to tell the real intent. Make it simple and just
// unconditionally disable HFAs for explicit layout.
if (pMT->GetClass()->HasExplicitFieldOffsetLayout())
return;
CorInfoHFAElemType hfaType = pNativeLayoutInfo->GetNativeHFATypeRaw();
if (hfaType == CORINFO_HFA_ELEM_NONE)
{
return;
}
// All the above tests passed. It's HFA!
pNativeLayoutInfo->SetHFAType(hfaType);
}
#endif // FEATURE_HFA
}
//=======================================================================
// Called from the clsloader to load up and summarize the field metadata
// for layout classes.
//
// Warning: This function can load other classes (esp. for nested structs.)
//=======================================================================
VOID EEClassLayoutInfo::CollectLayoutFieldMetadataThrowing(
mdTypeDef cl, // cl of the NStruct being loaded
BYTE packingSize, // packing size (from @dll.struct)
BYTE nlType, // nltype (from @dll.struct)
BOOL fExplicitOffsets, // explicit offsets?
MethodTable *pParentMT, // the loaded superclass
ULONG cTotalFields, // total number of fields (instance and static)
HENUMInternal *phEnumField, // enumerator for field
Module *pModule, // Module that defines the scope, loader and heap (for allocate FieldMarshalers)
const SigTypeContext *pTypeContext, // Type parameters for NStruct being loaded
EEClassLayoutInfo *pEEClassLayoutInfoOut, // caller-allocated structure to fill in.
LayoutRawFieldInfo *pInfoArrayOut, // caller-allocated array to fill in. Needs room for cMember+1 elements
LoaderAllocator *pAllocator,
AllocMemTracker *pamTracker
)
{
CONTRACTL
{
STANDARD_VM_CHECK;
PRECONDITION(CheckPointer(pModule));
}
CONTRACTL_END;
// Internal interface for the NStruct being loaded.
IMDInternalImport *pInternalImport = pModule->GetMDImport();
#ifdef _DEBUG
LPCUTF8 szName;
LPCUTF8 szNamespace;
if (FAILED(pInternalImport->GetNameOfTypeDef(cl, &szName, &szNamespace)))
{
szName = szNamespace = "Invalid TypeDef record";
}
if (g_pConfig->ShouldBreakOnStructMarshalSetup(szName))
CONSISTENCY_CHECK_MSGF(false, ("BreakOnStructMarshalSetup: '%s' ", szName));
#endif
// Running tote - if anything in this type disqualifies it from being ManagedSequential, somebody will set this to TRUE by the time
// function exits.
BOOL fDisqualifyFromManagedSequential;
BOOL hasAutoLayoutField = FALSE;
BOOL hasInt128Field = FALSE;
// Check if this type might be ManagedSequential. Only valuetypes marked Sequential can be
// ManagedSequential. Other issues checked below might also disqualify the type.
if ( (!fExplicitOffsets) && // Is it marked sequential?
(pParentMT && (pParentMT->IsObjectClass() || pParentMT->IsValueTypeClass() || pParentMT->IsManagedSequential())) // Is it a valuetype or derived from a qualifying valuetype?
)
{
fDisqualifyFromManagedSequential = FALSE;
}
else
{
fDisqualifyFromManagedSequential = TRUE;
}
if (pParentMT && !pParentMT->IsValueTypeClass())
{
if (pParentMT->IsAutoLayoutOrHasAutoLayoutField())
hasAutoLayoutField = TRUE;
if (pParentMT->IsInt128OrHasInt128Fields())
hasInt128Field = TRUE;
}
BOOL fHasNonTrivialParent = pParentMT &&
!pParentMT->IsObjectClass() &&
!pParentMT->IsValueTypeClass();
// Set some defaults based on the parent type of this type (if one exists).
_ASSERTE(!(fHasNonTrivialParent && !(pParentMT->HasLayout())));
pEEClassLayoutInfoOut->SetIsZeroSized(FALSE);
pEEClassLayoutInfoOut->SetHasExplicitSize(FALSE);
pEEClassLayoutInfoOut->m_cbPackingSize = packingSize;
BOOL fParentHasLayout = pParentMT && pParentMT->HasLayout();
UINT32 cbAdjustedParentLayoutSize = 0;
EEClassLayoutInfo *pParentLayoutInfo = NULL;
if (fParentHasLayout)
{
pParentLayoutInfo = pParentMT->GetLayoutInfo();
// Treat base class as an initial member.
// If the parent was originally a zero-sized explicit type but
// got bumped up to a size of 1 for compatibility reasons, then
// we need to remove the padding, but ONLY for inheritance situations.
if (pParentLayoutInfo->IsZeroSized()) {
cbAdjustedParentLayoutSize = 0;
}
else
{
cbAdjustedParentLayoutSize = pParentMT->GetNumInstanceFieldBytes();
}
}
ULONG cInstanceFields = 0;
ParseNativeTypeFlags nativeTypeFlags = ParseNativeTypeFlags::None;
if (nlType == nltAnsi)
nativeTypeFlags = ParseNativeTypeFlags::IsAnsi;
BOOL isBlittable;
DetermineBlittabilityAndManagedSequential(
pInternalImport,
phEnumField,
pModule,
cl,
nativeTypeFlags,
pTypeContext,
&fDisqualifyFromManagedSequential,
&hasAutoLayoutField,
&hasInt128Field,
pInfoArrayOut,
&isBlittable,
&cInstanceFields
DEBUGARG(cTotalFields)
DEBUGARG(szNamespace)
DEBUGARG(szName)
);
// Type is blittable only if parent is also blittable
isBlittable = isBlittable && (fHasNonTrivialParent ? pParentMT->IsBlittable() : TRUE);
pEEClassLayoutInfoOut->SetIsBlittable(isBlittable);
pEEClassLayoutInfoOut->SetHasAutoLayoutField(hasAutoLayoutField);
pEEClassLayoutInfoOut->SetIsInt128OrHasInt128Fields(hasInt128Field);
S_UINT32 cbSortArraySize = S_UINT32(cTotalFields) * S_UINT32(sizeof(LayoutRawFieldInfo*));
if (cbSortArraySize.IsOverflow())
{
ThrowHR(COR_E_TYPELOAD);
}
CQuickArray<LayoutRawFieldInfo*> pSortArray;
pSortArray.ReSizeThrows(cbSortArraySize.Value());
SetOffsetsAndSortFields(pInternalImport, cl, pInfoArrayOut, cInstanceFields, fExplicitOffsets, cbAdjustedParentLayoutSize, pModule, pSortArray.Ptr());
ULONG classSizeInMetadata = 0;
if (FAILED(pInternalImport->GetClassTotalSize(cl, &classSizeInMetadata)))
{
classSizeInMetadata = 0;
}
else
{
// If we can get the class size from metadata, that means that the user
// explicitly provided a value to the StructLayoutAttribute.Size field
// or explicitly provided the size in IL.
pEEClassLayoutInfoOut->SetHasExplicitSize(TRUE);
}
BYTE parentAlignmentRequirement = 0;
if (fParentHasLayout)
{
parentAlignmentRequirement = pParentLayoutInfo->m_ManagedLargestAlignmentRequirementOfAllMembers;
}
BYTE parentManagedAlignmentRequirement = 0;
if (pParentMT && (pParentMT->IsManagedSequential() || (pParentMT->GetClass()->HasExplicitFieldOffsetLayout() && pParentMT->IsBlittable())))
{
parentManagedAlignmentRequirement = pParentLayoutInfo->m_ManagedLargestAlignmentRequirementOfAllMembers;
}
CalculateSizeAndFieldOffsets(
cbAdjustedParentLayoutSize,
cInstanceFields,
fExplicitOffsets,
pSortArray.Ptr(),
classSizeInMetadata,
packingSize,
parentManagedAlignmentRequirement,
/*limitToMaxInteropSize*/ FALSE,
&pEEClassLayoutInfoOut->m_ManagedLargestAlignmentRequirementOfAllMembers,
&pEEClassLayoutInfoOut->m_cbManagedSize);
if (pEEClassLayoutInfoOut->m_cbManagedSize == 0)
{
pEEClassLayoutInfoOut->SetIsZeroSized(TRUE);
pEEClassLayoutInfoOut->m_cbManagedSize = 1; // Bump the managed size of the structure up to 1.
}
pEEClassLayoutInfoOut->SetIsManagedSequential(!fDisqualifyFromManagedSequential);
}
void EEClassNativeLayoutInfo::InitializeNativeLayoutFieldMetadataThrowing(MethodTable* pMT)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
PRECONDITION(CheckPointer(pMT));
PRECONDITION(pMT->HasLayout());
}
CONTRACTL_END;
EEClass* pClass = pMT->GetClass();
EEClassLayoutInfo* pLayoutInfo = pClass->GetLayoutInfo();
if (pClass->GetNativeLayoutInfo() == nullptr)
{
GCX_PREEMP();
ListLockHolder nativeTypeLoadLock(AppDomain::GetCurrentDomain()->GetNativeTypeLoadLock());
ListLockEntryHolder entry(ListLockEntry::Find(nativeTypeLoadLock, pMT->GetClass()));
ListLockEntryLockHolder pEntryLock(entry, FALSE);
nativeTypeLoadLock.Release();
if (!pEntryLock.DeadlockAwareAcquire())
{
DefineFullyQualifiedNameForClassW()
COMPlusThrow(kTypeLoadException, IDS_CANNOT_MARSHAL_RECURSIVE_DEF, GetFullyQualifiedNameForClassW(pMT));
}
if (pClass->GetNativeLayoutInfo() == nullptr)
{
EEClassNativeLayoutInfo* pNativeLayoutInfo = CollectNativeLayoutFieldMetadataThrowing(pMT);
#ifdef FEATURE_HFA
CheckForNativeHFA(pMT, pNativeLayoutInfo);
#endif
#ifdef UNIX_AMD64_ABI
SystemVAmd64CheckForPassNativeStructInRegister(pMT, pNativeLayoutInfo);
#endif
((LayoutEEClass*)pClass)->m_nativeLayoutInfo = pNativeLayoutInfo;
}
}
}
EEClassNativeLayoutInfo* EEClassNativeLayoutInfo::CollectNativeLayoutFieldMetadataThrowing(MethodTable* pMT)
{
CONTRACTL
{
STANDARD_VM_CHECK;
PRECONDITION(CheckPointer(pMT));
PRECONDITION(pMT->HasLayout());
}
CONTRACTL_END;
Module* pModule = pMT->GetModule();
// Internal interface for the NStruct being loaded.
IMDInternalImport* pInternalImport = pModule->GetMDImport();
#ifdef _DEBUG
LPCUTF8 szName;
LPCUTF8 szNamespace;
if (FAILED(pInternalImport->GetNameOfTypeDef(pMT->GetCl(), &szName, &szNamespace)))
{
szName = szNamespace = "Invalid TypeDef record";
}
if (g_pConfig->ShouldBreakOnStructMarshalSetup(szName))
CONSISTENCY_CHECK_MSGF(false, ("BreakOnStructMarshalSetup: '%s' ", szName));
#endif
MethodTable* pParentMT = pMT->GetParentMethodTable();
BOOL fHasNonTrivialParent = pParentMT &&
!pParentMT->IsObjectClass() &&
!pParentMT->IsValueTypeClass();
// Set some defaults based on the parent type of this type (if one exists).
_ASSERTE(!(fHasNonTrivialParent && !(pParentMT->HasLayout())));
BOOL fParentHasLayout = pParentMT && pParentMT->HasLayout();
UINT32 cbAdjustedParentLayoutNativeSize = 0;
EEClassNativeLayoutInfo const* pParentLayoutInfo = NULL;
if (fParentHasLayout)
{
pParentLayoutInfo = pParentMT->GetNativeLayoutInfo();
// Treat base class as an initial member.
cbAdjustedParentLayoutNativeSize = pParentLayoutInfo->GetSize();
// If the parent was originally a zero-sized explicit type but
// got bumped up to a size of 1 for compatibility reasons, then
// we need to remove the padding, but ONLY for inheritance situations.
if (pParentMT->GetLayoutInfo()->IsZeroSized()) {
CONSISTENCY_CHECK(cbAdjustedParentLayoutNativeSize == 1);
cbAdjustedParentLayoutNativeSize = 0;
}
}
CorNativeLinkType charSet = pMT->GetCharSet();
ParseNativeTypeFlags nativeTypeFlags = ParseNativeTypeFlags::None;
if (charSet == nltAnsi)
nativeTypeFlags = ParseNativeTypeFlags::IsAnsi;
ApproxFieldDescIterator fieldDescs(pMT, ApproxFieldDescIterator::INSTANCE_FIELDS);
ULONG cInstanceFields = fieldDescs.Count();
NewArrayHolder<LayoutRawFieldInfo> pInfoArray = new LayoutRawFieldInfo[cInstanceFields + 1];
SigTypeContext context(pMT);
ParseFieldNativeTypes(
pInternalImport,
pMT->GetCl(),
fieldDescs,
pModule,
nativeTypeFlags,
&context,
pInfoArray
DEBUGARG(szNamespace)
DEBUGARG(szName)
);
uint32_t numTotalInstanceFields = cInstanceFields + (pParentLayoutInfo != nullptr ? pParentLayoutInfo->GetNumFields() : 0);
LoaderAllocator* pAllocator = pMT->GetLoaderAllocator();
AllocMemHolder<EEClassNativeLayoutInfo> pNativeLayoutInfo(
pAllocator->GetLowFrequencyHeap()->AllocMem(
S_SIZE_T(sizeof(EEClassNativeLayoutInfo)) + S_SIZE_T(sizeof(NativeFieldDescriptor)) * S_SIZE_T(numTotalInstanceFields)));
pNativeLayoutInfo->m_numFields = numTotalInstanceFields;
// Now compute the native size of each field
for (LayoutRawFieldInfo* pfwalk = pInfoArray; pfwalk->m_MD != mdFieldDefNil; pfwalk++)
{
pfwalk->m_placement.m_size = pfwalk->m_nfd.NativeSize();
pfwalk->m_placement.m_alignment = pfwalk->m_nfd.AlignmentRequirement();
}
S_UINT32 cbSortArraySize = S_UINT32(cInstanceFields) * S_UINT32(sizeof(LayoutRawFieldInfo*));
if (cbSortArraySize.IsOverflow())
{
ThrowHR(COR_E_TYPELOAD);
}
BOOL fExplicitOffsets = pMT->GetClass()->HasExplicitFieldOffsetLayout();
CQuickArray<LayoutRawFieldInfo*> pSortArray;
pSortArray.ReSizeThrows(cbSortArraySize.Value());
SetOffsetsAndSortFields(pInternalImport, pMT->GetCl(), pInfoArray, cInstanceFields, fExplicitOffsets, cbAdjustedParentLayoutNativeSize, pModule, pSortArray.Ptr());
EEClassLayoutInfo* pEEClassLayoutInfo = pMT->GetLayoutInfo();
ULONG classSizeInMetadata = 0;
if (pEEClassLayoutInfo->HasExplicitSize())
{
HRESULT hr = pInternalImport->GetClassTotalSize(pMT->GetCl(), &classSizeInMetadata);
CONSISTENCY_CHECK(hr == S_OK);
}
else if (pMT->GetClass()->IsInlineArray())
{
// If the type is an inline array, we need to calculate the size based on the number of elements.
const void* pVal; // The custom value.
ULONG cbVal; // Size of the custom value.
HRESULT hr = pMT->GetCustomAttribute(
WellKnownAttribute::InlineArrayAttribute,
&pVal, &cbVal);
if (hr != S_FALSE)
{
// Validity of the InlineArray attribute is checked at type-load time,
// so we only assert here as we should have already checked this and failed
// type load if this condition is false.
_ASSERTE(cbVal >= (sizeof(INT32) + 2));
if (cbVal >= (sizeof(INT32) + 2))
{
INT32 repeat = GET_UNALIGNED_VAL32((byte*)pVal + 2);
if (repeat > 0)
{
classSizeInMetadata = repeat * pInfoArray[0].m_nfd.NativeSize();
}
}
}
}
BYTE parentAlignmentRequirement = 0;
if (fParentHasLayout)
{
parentAlignmentRequirement = pParentLayoutInfo->GetLargestAlignmentRequirement();
}