LLVM  10.0.0svn
DwarfUnit.cpp
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1 //===-- llvm/CodeGen/DwarfUnit.cpp - Dwarf Type and Compile Units ---------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains support for constructing a dwarf compile unit.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "DwarfUnit.h"
14 #include "AddressPool.h"
15 #include "DwarfCompileUnit.h"
16 #include "DwarfDebug.h"
17 #include "DwarfExpression.h"
18 #include "llvm/ADT/APFloat.h"
19 #include "llvm/ADT/APInt.h"
20 #include "llvm/ADT/None.h"
21 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/IR/Constants.h"
28 #include "llvm/IR/DataLayout.h"
29 #include "llvm/IR/GlobalValue.h"
30 #include "llvm/IR/Metadata.h"
31 #include "llvm/MC/MCAsmInfo.h"
32 #include "llvm/MC/MCContext.h"
33 #include "llvm/MC/MCDwarf.h"
34 #include "llvm/MC/MCSection.h"
35 #include "llvm/MC/MCStreamer.h"
37 #include "llvm/Support/Casting.h"
40 #include <cassert>
41 #include <cstdint>
42 #include <string>
43 #include <utility>
44 
45 using namespace llvm;
46 
47 #define DEBUG_TYPE "dwarfdebug"
48 
51  DIELoc &DIE)
52  : DwarfExpression(AP.getDwarfVersion(), CU), AP(AP),
53  DIE(DIE) {}
54 
55 void DIEDwarfExpression::emitOp(uint8_t Op, const char* Comment) {
56  CU.addUInt(DIE, dwarf::DW_FORM_data1, Op);
57 }
58 
59 void DIEDwarfExpression::emitSigned(int64_t Value) {
60  CU.addSInt(DIE, dwarf::DW_FORM_sdata, Value);
61 }
62 
63 void DIEDwarfExpression::emitUnsigned(uint64_t Value) {
64  CU.addUInt(DIE, dwarf::DW_FORM_udata, Value);
65 }
66 
67 void DIEDwarfExpression::emitData1(uint8_t Value) {
68  CU.addUInt(DIE, dwarf::DW_FORM_data1, Value);
69 }
70 
71 void DIEDwarfExpression::emitBaseTypeRef(uint64_t Idx) {
72  CU.addBaseTypeRef(DIE, Idx);
73 }
74 
75 bool DIEDwarfExpression::isFrameRegister(const TargetRegisterInfo &TRI,
76  unsigned MachineReg) {
77  return MachineReg == TRI.getFrameRegister(*AP.MF);
78 }
79 
81  AsmPrinter *A, DwarfDebug *DW, DwarfFile *DWU)
82  : DIEUnit(A->getDwarfVersion(), A->MAI->getCodePointerSize(), UnitTag),
83  CUNode(Node), Asm(A), DD(DW), DU(DWU), IndexTyDie(nullptr) {
84 }
85 
87  DwarfDebug *DW, DwarfFile *DWU,
88  MCDwarfDwoLineTable *SplitLineTable)
89  : DwarfUnit(dwarf::DW_TAG_type_unit, CU.getCUNode(), A, DW, DWU), CU(CU),
90  SplitLineTable(SplitLineTable) {
91 }
92 
94  for (unsigned j = 0, M = DIEBlocks.size(); j < M; ++j)
95  DIEBlocks[j]->~DIEBlock();
96  for (unsigned j = 0, M = DIELocs.size(); j < M; ++j)
97  DIELocs[j]->~DIELoc();
98 }
99 
100 int64_t DwarfUnit::getDefaultLowerBound() const {
101  switch (getLanguage()) {
102  default:
103  break;
104 
105  // The languages below have valid values in all DWARF versions.
106  case dwarf::DW_LANG_C:
107  case dwarf::DW_LANG_C89:
108  case dwarf::DW_LANG_C_plus_plus:
109  return 0;
110 
111  case dwarf::DW_LANG_Fortran77:
112  case dwarf::DW_LANG_Fortran90:
113  return 1;
114 
115  // The languages below have valid values only if the DWARF version >= 3.
116  case dwarf::DW_LANG_C99:
117  case dwarf::DW_LANG_ObjC:
118  case dwarf::DW_LANG_ObjC_plus_plus:
119  if (DD->getDwarfVersion() >= 3)
120  return 0;
121  break;
122 
123  case dwarf::DW_LANG_Fortran95:
124  if (DD->getDwarfVersion() >= 3)
125  return 1;
126  break;
127 
128  // Starting with DWARF v4, all defined languages have valid values.
129  case dwarf::DW_LANG_D:
130  case dwarf::DW_LANG_Java:
131  case dwarf::DW_LANG_Python:
132  case dwarf::DW_LANG_UPC:
133  if (DD->getDwarfVersion() >= 4)
134  return 0;
135  break;
136 
137  case dwarf::DW_LANG_Ada83:
138  case dwarf::DW_LANG_Ada95:
139  case dwarf::DW_LANG_Cobol74:
140  case dwarf::DW_LANG_Cobol85:
141  case dwarf::DW_LANG_Modula2:
142  case dwarf::DW_LANG_Pascal83:
143  case dwarf::DW_LANG_PLI:
144  if (DD->getDwarfVersion() >= 4)
145  return 1;
146  break;
147 
148  // The languages below are new in DWARF v5.
149  case dwarf::DW_LANG_BLISS:
150  case dwarf::DW_LANG_C11:
151  case dwarf::DW_LANG_C_plus_plus_03:
152  case dwarf::DW_LANG_C_plus_plus_11:
153  case dwarf::DW_LANG_C_plus_plus_14:
154  case dwarf::DW_LANG_Dylan:
155  case dwarf::DW_LANG_Go:
156  case dwarf::DW_LANG_Haskell:
157  case dwarf::DW_LANG_OCaml:
158  case dwarf::DW_LANG_OpenCL:
159  case dwarf::DW_LANG_RenderScript:
160  case dwarf::DW_LANG_Rust:
161  case dwarf::DW_LANG_Swift:
162  if (DD->getDwarfVersion() >= 5)
163  return 0;
164  break;
165 
166  case dwarf::DW_LANG_Fortran03:
167  case dwarf::DW_LANG_Fortran08:
168  case dwarf::DW_LANG_Julia:
169  case dwarf::DW_LANG_Modula3:
170  if (DD->getDwarfVersion() >= 5)
171  return 1;
172  break;
173  }
174 
175  return -1;
176 }
177 
178 /// Check whether the DIE for this MDNode can be shared across CUs.
180  // When the MDNode can be part of the type system, the DIE can be shared
181  // across CUs.
182  // Combining type units and cross-CU DIE sharing is lower value (since
183  // cross-CU DIE sharing is used in LTO and removes type redundancy at that
184  // level already) but may be implementable for some value in projects
185  // building multiple independent libraries with LTO and then linking those
186  // together.
187  if (isDwoUnit() && !DD->shareAcrossDWOCUs())
188  return false;
189  return (isa<DIType>(D) ||
190  (isa<DISubprogram>(D) && !cast<DISubprogram>(D)->isDefinition())) &&
191  !DD->generateTypeUnits();
192 }
193 
194 DIE *DwarfUnit::getDIE(const DINode *D) const {
195  if (isShareableAcrossCUs(D))
196  return DU->getDIE(D);
197  return MDNodeToDieMap.lookup(D);
198 }
199 
200 void DwarfUnit::insertDIE(const DINode *Desc, DIE *D) {
201  if (isShareableAcrossCUs(Desc)) {
202  DU->insertDIE(Desc, D);
203  return;
204  }
205  MDNodeToDieMap.insert(std::make_pair(Desc, D));
206 }
207 
209  MDNodeToDieMap.insert(std::make_pair(nullptr, D));
210 }
211 
213  if (DD->getDwarfVersion() >= 4)
214  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_flag_present,
215  DIEInteger(1));
216  else
217  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_flag,
218  DIEInteger(1));
219 }
220 
222  Optional<dwarf::Form> Form, uint64_t Integer) {
223  if (!Form)
224  Form = DIEInteger::BestForm(false, Integer);
225  assert(Form != dwarf::DW_FORM_implicit_const &&
226  "DW_FORM_implicit_const is used only for signed integers");
227  Die.addValue(DIEValueAllocator, Attribute, *Form, DIEInteger(Integer));
228 }
229 
231  uint64_t Integer) {
232  addUInt(Block, (dwarf::Attribute)0, Form, Integer);
233 }
234 
237  if (!Form)
238  Form = DIEInteger::BestForm(true, Integer);
239  Die.addValue(DIEValueAllocator, Attribute, *Form, DIEInteger(Integer));
240 }
241 
243  int64_t Integer) {
244  addSInt(Die, (dwarf::Attribute)0, Form, Integer);
245 }
246 
248  StringRef String) {
250  return;
251 
252  if (DD->useInlineStrings()) {
253  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_string,
254  new (DIEValueAllocator)
256  return;
257  }
258  dwarf::Form IxForm =
259  isDwoUnit() ? dwarf::DW_FORM_GNU_str_index : dwarf::DW_FORM_strp;
260 
261  auto StringPoolEntry =
262  useSegmentedStringOffsetsTable() || IxForm == dwarf::DW_FORM_GNU_str_index
263  ? DU->getStringPool().getIndexedEntry(*Asm, String)
264  : DU->getStringPool().getEntry(*Asm, String);
265 
266  // For DWARF v5 and beyond, use the smallest strx? form possible.
268  IxForm = dwarf::DW_FORM_strx1;
269  unsigned Index = StringPoolEntry.getIndex();
270  if (Index > 0xffffff)
271  IxForm = dwarf::DW_FORM_strx4;
272  else if (Index > 0xffff)
273  IxForm = dwarf::DW_FORM_strx3;
274  else if (Index > 0xff)
275  IxForm = dwarf::DW_FORM_strx2;
276  }
277  Die.addValue(DIEValueAllocator, Attribute, IxForm,
278  DIEString(StringPoolEntry));
279 }
280 
284  const MCSymbol *Label) {
285  return Die.addValue(DIEValueAllocator, Attribute, Form, DIELabel(Label));
286 }
287 
289  addLabel(Die, (dwarf::Attribute)0, Form, Label);
290 }
291 
293  uint64_t Integer) {
294  if (DD->getDwarfVersion() >= 4)
295  addUInt(Die, Attribute, dwarf::DW_FORM_sec_offset, Integer);
296  else
297  addUInt(Die, Attribute, dwarf::DW_FORM_data4, Integer);
298 }
299 
301  assert(File);
302  if (DD->getDwarfVersion() < 5)
303  return None;
304  Optional<DIFile::ChecksumInfo<StringRef>> Checksum = File->getChecksum();
305  if (!Checksum || Checksum->Kind != DIFile::CSK_MD5)
306  return None;
307 
308  // Convert the string checksum to an MD5Result for the streamer.
309  // The verifier validates the checksum so we assume it's okay.
310  // An MD5 checksum is 16 bytes.
311  std::string ChecksumString = fromHex(Checksum->Value);
312  MD5::MD5Result CKMem;
313  std::copy(ChecksumString.begin(), ChecksumString.end(), CKMem.Bytes.data());
314  return CKMem;
315 }
316 
317 unsigned DwarfTypeUnit::getOrCreateSourceID(const DIFile *File) {
318  if (!SplitLineTable)
319  return getCU().getOrCreateSourceID(File);
320  if (!UsedLineTable) {
321  UsedLineTable = true;
322  // This is a split type unit that needs a line table.
323  addSectionOffset(getUnitDie(), dwarf::DW_AT_stmt_list, 0);
324  }
325  return SplitLineTable->getFile(File->getDirectory(), File->getFilename(),
326  getMD5AsBytes(File),
328  File->getSource());
329 }
330 
331 void DwarfUnit::addOpAddress(DIELoc &Die, const MCSymbol *Sym) {
332  if (DD->getDwarfVersion() >= 5) {
333  addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addrx);
334  addUInt(Die, dwarf::DW_FORM_addrx, DD->getAddressPool().getIndex(Sym));
335  return;
336  }
337 
338  if (DD->useSplitDwarf()) {
339  addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_addr_index);
340  addUInt(Die, dwarf::DW_FORM_GNU_addr_index,
341  DD->getAddressPool().getIndex(Sym));
342  return;
343  }
344 
345  addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
346  addLabel(Die, dwarf::DW_FORM_udata, Sym);
347 }
348 
350  const MCSymbol *Hi, const MCSymbol *Lo) {
351  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_data4,
352  new (DIEValueAllocator) DIEDelta(Hi, Lo));
353 }
354 
356  addDIEEntry(Die, Attribute, DIEEntry(Entry));
357 }
358 
359 void DwarfUnit::addDIETypeSignature(DIE &Die, uint64_t Signature) {
360  // Flag the type unit reference as a declaration so that if it contains
361  // members (implicit special members, static data member definitions, member
362  // declarations for definitions in this CU, etc) consumers don't get confused
363  // and think this is a full definition.
364  addFlag(Die, dwarf::DW_AT_declaration);
365 
366  Die.addValue(DIEValueAllocator, dwarf::DW_AT_signature,
367  dwarf::DW_FORM_ref_sig8, DIEInteger(Signature));
368 }
369 
371  DIEEntry Entry) {
372  const DIEUnit *CU = Die.getUnit();
373  const DIEUnit *EntryCU = Entry.getEntry().getUnit();
374  if (!CU)
375  // We assume that Die belongs to this CU, if it is not linked to any CU yet.
376  CU = getUnitDie().getUnit();
377  if (!EntryCU)
378  EntryCU = getUnitDie().getUnit();
379  Die.addValue(DIEValueAllocator, Attribute,
380  EntryCU == CU ? dwarf::DW_FORM_ref4 : dwarf::DW_FORM_ref_addr,
381  Entry);
382 }
383 
384 DIE &DwarfUnit::createAndAddDIE(unsigned Tag, DIE &Parent, const DINode *N) {
385  DIE &Die = Parent.addChild(DIE::get(DIEValueAllocator, (dwarf::Tag)Tag));
386  if (N)
387  insertDIE(N, &Die);
388  return Die;
389 }
390 
392  Loc->ComputeSize(Asm);
393  DIELocs.push_back(Loc); // Memoize so we can call the destructor later on.
394  Die.addValue(DIEValueAllocator, Attribute,
395  Loc->BestForm(DD->getDwarfVersion()), Loc);
396 }
397 
399  DIEBlock *Block) {
400  Block->ComputeSize(Asm);
401  DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on.
402  Die.addValue(DIEValueAllocator, Attribute, Block->BestForm(), Block);
403 }
404 
405 void DwarfUnit::addSourceLine(DIE &Die, unsigned Line, const DIFile *File) {
406  if (Line == 0)
407  return;
408 
409  unsigned FileID = getOrCreateSourceID(File);
410  addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
411  addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
412 }
413 
415  assert(V);
416 
417  addSourceLine(Die, V->getLine(), V->getFile());
418 }
419 
421  assert(G);
422 
423  addSourceLine(Die, G->getLine(), G->getFile());
424 }
425 
427  assert(SP);
428 
429  addSourceLine(Die, SP->getLine(), SP->getFile());
430 }
431 
432 void DwarfUnit::addSourceLine(DIE &Die, const DILabel *L) {
433  assert(L);
434 
435  addSourceLine(Die, L->getLine(), L->getFile());
436 }
437 
438 void DwarfUnit::addSourceLine(DIE &Die, const DIType *Ty) {
439  assert(Ty);
440 
441  addSourceLine(Die, Ty->getLine(), Ty->getFile());
442 }
443 
445  assert(Ty);
446 
447  addSourceLine(Die, Ty->getLine(), Ty->getFile());
448 }
449 
450 /// Return true if type encoding is unsigned.
451 static bool isUnsignedDIType(DwarfDebug *DD, const DIType *Ty) {
452  if (auto *CTy = dyn_cast<DICompositeType>(Ty)) {
453  // FIXME: Enums without a fixed underlying type have unknown signedness
454  // here, leading to incorrectly emitted constants.
455  if (CTy->getTag() == dwarf::DW_TAG_enumeration_type)
456  return false;
457 
458  // (Pieces of) aggregate types that get hacked apart by SROA may be
459  // represented by a constant. Encode them as unsigned bytes.
460  return true;
461  }
462 
463  if (auto *DTy = dyn_cast<DIDerivedType>(Ty)) {
464  dwarf::Tag T = (dwarf::Tag)Ty->getTag();
465  // Encode pointer constants as unsigned bytes. This is used at least for
466  // null pointer constant emission.
467  // FIXME: reference and rvalue_reference /probably/ shouldn't be allowed
468  // here, but accept them for now due to a bug in SROA producing bogus
469  // dbg.values.
470  if (T == dwarf::DW_TAG_pointer_type ||
471  T == dwarf::DW_TAG_ptr_to_member_type ||
472  T == dwarf::DW_TAG_reference_type ||
473  T == dwarf::DW_TAG_rvalue_reference_type)
474  return true;
475  assert(T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type ||
476  T == dwarf::DW_TAG_volatile_type ||
477  T == dwarf::DW_TAG_restrict_type || T == dwarf::DW_TAG_atomic_type);
478  assert(DTy->getBaseType() && "Expected valid base type");
479  return isUnsignedDIType(DD, DTy->getBaseType());
480  }
481 
482  auto *BTy = cast<DIBasicType>(Ty);
483  unsigned Encoding = BTy->getEncoding();
484  assert((Encoding == dwarf::DW_ATE_unsigned ||
485  Encoding == dwarf::DW_ATE_unsigned_char ||
486  Encoding == dwarf::DW_ATE_signed ||
487  Encoding == dwarf::DW_ATE_signed_char ||
488  Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF ||
489  Encoding == dwarf::DW_ATE_boolean ||
490  (Ty->getTag() == dwarf::DW_TAG_unspecified_type &&
491  Ty->getName() == "decltype(nullptr)")) &&
492  "Unsupported encoding");
493  return Encoding == dwarf::DW_ATE_unsigned ||
494  Encoding == dwarf::DW_ATE_unsigned_char ||
495  Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean ||
496  Ty->getTag() == dwarf::DW_TAG_unspecified_type;
497 }
498 
500  assert(MO.isFPImm() && "Invalid machine operand!");
501  DIEBlock *Block = new (DIEValueAllocator) DIEBlock;
502  APFloat FPImm = MO.getFPImm()->getValueAPF();
503 
504  // Get the raw data form of the floating point.
505  const APInt FltVal = FPImm.bitcastToAPInt();
506  const char *FltPtr = (const char *)FltVal.getRawData();
507 
508  int NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
509  bool LittleEndian = Asm->getDataLayout().isLittleEndian();
510  int Incr = (LittleEndian ? 1 : -1);
511  int Start = (LittleEndian ? 0 : NumBytes - 1);
512  int Stop = (LittleEndian ? NumBytes : -1);
513 
514  // Output the constant to DWARF one byte at a time.
515  for (; Start != Stop; Start += Incr)
516  addUInt(*Block, dwarf::DW_FORM_data1, (unsigned char)0xFF & FltPtr[Start]);
517 
518  addBlock(Die, dwarf::DW_AT_const_value, Block);
519 }
520 
522  // Pass this down to addConstantValue as an unsigned bag of bits.
523  addConstantValue(Die, CFP->getValueAPF().bitcastToAPInt(), true);
524 }
525 
527  const DIType *Ty) {
528  addConstantValue(Die, CI->getValue(), Ty);
529 }
530 
532  const DIType *Ty) {
533  assert(MO.isImm() && "Invalid machine operand!");
534 
535  addConstantValue(Die, isUnsignedDIType(DD, Ty), MO.getImm());
536 }
537 
538 void DwarfUnit::addConstantValue(DIE &Die, uint64_t Val, const DIType *Ty) {
539  addConstantValue(Die, isUnsignedDIType(DD, Ty), Val);
540 }
541 
542 void DwarfUnit::addConstantValue(DIE &Die, bool Unsigned, uint64_t Val) {
543  // FIXME: This is a bit conservative/simple - it emits negative values always
544  // sign extended to 64 bits rather than minimizing the number of bytes.
545  addUInt(Die, dwarf::DW_AT_const_value,
546  Unsigned ? dwarf::DW_FORM_udata : dwarf::DW_FORM_sdata, Val);
547 }
548 
549 void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, const DIType *Ty) {
550  addConstantValue(Die, Val, isUnsignedDIType(DD, Ty));
551 }
552 
553 void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, bool Unsigned) {
554  unsigned CIBitWidth = Val.getBitWidth();
555  if (CIBitWidth <= 64) {
556  addConstantValue(Die, Unsigned,
557  Unsigned ? Val.getZExtValue() : Val.getSExtValue());
558  return;
559  }
560 
561  DIEBlock *Block = new (DIEValueAllocator) DIEBlock;
562 
563  // Get the raw data form of the large APInt.
564  const uint64_t *Ptr64 = Val.getRawData();
565 
566  int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
567  bool LittleEndian = Asm->getDataLayout().isLittleEndian();
568 
569  // Output the constant to DWARF one byte at a time.
570  for (int i = 0; i < NumBytes; i++) {
571  uint8_t c;
572  if (LittleEndian)
573  c = Ptr64[i / 8] >> (8 * (i & 7));
574  else
575  c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
576  addUInt(*Block, dwarf::DW_FORM_data1, c);
577  }
578 
579  addBlock(Die, dwarf::DW_AT_const_value, Block);
580 }
581 
583  if (!LinkageName.empty())
584  addString(Die,
585  DD->getDwarfVersion() >= 4 ? dwarf::DW_AT_linkage_name
586  : dwarf::DW_AT_MIPS_linkage_name,
588 }
589 
590 void DwarfUnit::addTemplateParams(DIE &Buffer, DINodeArray TParams) {
591  // Add template parameters.
592  for (const auto *Element : TParams) {
593  if (auto *TTP = dyn_cast<DITemplateTypeParameter>(Element))
594  constructTemplateTypeParameterDIE(Buffer, TTP);
595  else if (auto *TVP = dyn_cast<DITemplateValueParameter>(Element))
596  constructTemplateValueParameterDIE(Buffer, TVP);
597  }
598 }
599 
600 /// Add thrown types.
601 void DwarfUnit::addThrownTypes(DIE &Die, DINodeArray ThrownTypes) {
602  for (const auto *Ty : ThrownTypes) {
603  DIE &TT = createAndAddDIE(dwarf::DW_TAG_thrown_type, Die);
604  addType(TT, cast<DIType>(Ty));
605  }
606 }
607 
609  if (!Context || isa<DIFile>(Context))
610  return &getUnitDie();
611  if (auto *T = dyn_cast<DIType>(Context))
612  return getOrCreateTypeDIE(T);
613  if (auto *NS = dyn_cast<DINamespace>(Context))
614  return getOrCreateNameSpace(NS);
615  if (auto *SP = dyn_cast<DISubprogram>(Context))
617  if (auto *M = dyn_cast<DIModule>(Context))
618  return getOrCreateModule(M);
619  return getDIE(Context);
620 }
621 
623  auto *Context = Ty->getScope();
624  DIE *ContextDIE = getOrCreateContextDIE(Context);
625 
626  if (DIE *TyDIE = getDIE(Ty))
627  return TyDIE;
628 
629  // Create new type.
630  DIE &TyDIE = createAndAddDIE(Ty->getTag(), *ContextDIE, Ty);
631 
632  constructTypeDIE(TyDIE, cast<DICompositeType>(Ty));
633 
634  updateAcceleratorTables(Context, Ty, TyDIE);
635  return &TyDIE;
636 }
637 
639  const DIType *Ty) {
640  // Create new type.
641  DIE &TyDIE = createAndAddDIE(Ty->getTag(), ContextDIE, Ty);
642 
643  updateAcceleratorTables(Context, Ty, TyDIE);
644 
645  if (auto *BT = dyn_cast<DIBasicType>(Ty))
646  constructTypeDIE(TyDIE, BT);
647  else if (auto *STy = dyn_cast<DISubroutineType>(Ty))
648  constructTypeDIE(TyDIE, STy);
649  else if (auto *CTy = dyn_cast<DICompositeType>(Ty)) {
650  if (DD->generateTypeUnits() && !Ty->isForwardDecl() &&
651  (Ty->getRawName() || CTy->getRawIdentifier())) {
652  // Skip updating the accelerator tables since this is not the full type.
653  if (MDString *TypeId = CTy->getRawIdentifier())
654  DD->addDwarfTypeUnitType(getCU(), TypeId->getString(), TyDIE, CTy);
655  else {
656  auto X = DD->enterNonTypeUnitContext();
657  finishNonUnitTypeDIE(TyDIE, CTy);
658  }
659  return &TyDIE;
660  }
661  constructTypeDIE(TyDIE, CTy);
662  } else {
663  constructTypeDIE(TyDIE, cast<DIDerivedType>(Ty));
664  }
665 
666  return &TyDIE;
667 }
668 
670  if (!TyNode)
671  return nullptr;
672 
673  auto *Ty = cast<DIType>(TyNode);
674 
675  // DW_TAG_restrict_type is not supported in DWARF2
676  if (Ty->getTag() == dwarf::DW_TAG_restrict_type && DD->getDwarfVersion() <= 2)
677  return getOrCreateTypeDIE(cast<DIDerivedType>(Ty)->getBaseType());
678 
679  // DW_TAG_atomic_type is not supported in DWARF < 5
680  if (Ty->getTag() == dwarf::DW_TAG_atomic_type && DD->getDwarfVersion() < 5)
681  return getOrCreateTypeDIE(cast<DIDerivedType>(Ty)->getBaseType());
682 
683  // Construct the context before querying for the existence of the DIE in case
684  // such construction creates the DIE.
685  auto *Context = Ty->getScope();
686  DIE *ContextDIE = getOrCreateContextDIE(Context);
687  assert(ContextDIE);
688 
689  if (DIE *TyDIE = getDIE(Ty))
690  return TyDIE;
691 
692  return static_cast<DwarfUnit *>(ContextDIE->getUnit())
693  ->createTypeDIE(Context, *ContextDIE, Ty);
694 }
695 
696 void DwarfUnit::updateAcceleratorTables(const DIScope *Context,
697  const DIType *Ty, const DIE &TyDIE) {
698  if (!Ty->getName().empty() && !Ty->isForwardDecl()) {
699  bool IsImplementation = false;
700  if (auto *CT = dyn_cast<DICompositeType>(Ty)) {
701  // A runtime language of 0 actually means C/C++ and that any
702  // non-negative value is some version of Objective-C/C++.
703  IsImplementation = CT->getRuntimeLang() == 0 || CT->isObjcClassComplete();
704  }
705  unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
706  DD->addAccelType(*CUNode, Ty->getName(), TyDIE, Flags);
707 
708  if (!Context || isa<DICompileUnit>(Context) || isa<DIFile>(Context) ||
709  isa<DINamespace>(Context) || isa<DICommonBlock>(Context))
710  addGlobalType(Ty, TyDIE, Context);
711  }
712 }
713 
714 void DwarfUnit::addType(DIE &Entity, const DIType *Ty,
716  assert(Ty && "Trying to add a type that doesn't exist?");
717  addDIEEntry(Entity, Attribute, DIEEntry(*getOrCreateTypeDIE(Ty)));
718 }
719 
720 std::string DwarfUnit::getParentContextString(const DIScope *Context) const {
721  if (!Context)
722  return "";
723 
724  // FIXME: Decide whether to implement this for non-C++ languages.
725  if (getLanguage() != dwarf::DW_LANG_C_plus_plus)
726  return "";
727 
728  std::string CS;
730  while (!isa<DICompileUnit>(Context)) {
731  Parents.push_back(Context);
732  if (const DIScope *S = Context->getScope())
733  Context = S;
734  else
735  // Structure, etc types will have a NULL context if they're at the top
736  // level.
737  break;
738  }
739 
740  // Reverse iterate over our list to go from the outermost construct to the
741  // innermost.
742  for (const DIScope *Ctx : make_range(Parents.rbegin(), Parents.rend())) {
743  StringRef Name = Ctx->getName();
744  if (Name.empty() && isa<DINamespace>(Ctx))
745  Name = "(anonymous namespace)";
746  if (!Name.empty()) {
747  CS += Name;
748  CS += "::";
749  }
750  }
751  return CS;
752 }
753 
754 void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIBasicType *BTy) {
755  // Get core information.
756  StringRef Name = BTy->getName();
757  // Add name if not anonymous or intermediate type.
758  if (!Name.empty())
759  addString(Buffer, dwarf::DW_AT_name, Name);
760 
761  // An unspecified type only has a name attribute.
762  if (BTy->getTag() == dwarf::DW_TAG_unspecified_type)
763  return;
764 
765  addUInt(Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
766  BTy->getEncoding());
767 
768  uint64_t Size = BTy->getSizeInBits() >> 3;
769  addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
770 
771  if (BTy->isBigEndian())
772  addUInt(Buffer, dwarf::DW_AT_endianity, None, dwarf::DW_END_big);
773  else if (BTy->isLittleEndian())
774  addUInt(Buffer, dwarf::DW_AT_endianity, None, dwarf::DW_END_little);
775 }
776 
777 void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIDerivedType *DTy) {
778  // Get core information.
779  StringRef Name = DTy->getName();
780  uint64_t Size = DTy->getSizeInBits() >> 3;
781  uint16_t Tag = Buffer.getTag();
782 
783  // Map to main type, void will not have a type.
784  const DIType *FromTy = DTy->getBaseType();
785  if (FromTy)
786  addType(Buffer, FromTy);
787 
788  // Add name if not anonymous or intermediate type.
789  if (!Name.empty())
790  addString(Buffer, dwarf::DW_AT_name, Name);
791 
792  // Add size if non-zero (derived types might be zero-sized.)
793  if (Size && Tag != dwarf::DW_TAG_pointer_type
794  && Tag != dwarf::DW_TAG_ptr_to_member_type
795  && Tag != dwarf::DW_TAG_reference_type
796  && Tag != dwarf::DW_TAG_rvalue_reference_type)
797  addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
798 
799  if (Tag == dwarf::DW_TAG_ptr_to_member_type)
800  addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
801  *getOrCreateTypeDIE(cast<DIDerivedType>(DTy)->getClassType()));
802  // Add source line info if available and TyDesc is not a forward declaration.
803  if (!DTy->isForwardDecl())
804  addSourceLine(Buffer, DTy);
805 
806  // If DWARF address space value is other than None, add it. The IR
807  // verifier checks that DWARF address space only exists for pointer
808  // or reference types.
809  if (DTy->getDWARFAddressSpace())
810  addUInt(Buffer, dwarf::DW_AT_address_class, dwarf::DW_FORM_data4,
811  DTy->getDWARFAddressSpace().getValue());
812 }
813 
815  for (unsigned i = 1, N = Args.size(); i < N; ++i) {
816  const DIType *Ty = Args[i];
817  if (!Ty) {
818  assert(i == N-1 && "Unspecified parameter must be the last argument");
819  createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
820  } else {
821  DIE &Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
822  addType(Arg, Ty);
823  if (Ty->isArtificial())
824  addFlag(Arg, dwarf::DW_AT_artificial);
825  }
826  }
827 }
828 
829 void DwarfUnit::constructTypeDIE(DIE &Buffer, const DISubroutineType *CTy) {
830  // Add return type. A void return won't have a type.
831  auto Elements = cast<DISubroutineType>(CTy)->getTypeArray();
832  if (Elements.size())
833  if (auto RTy = Elements[0])
834  addType(Buffer, RTy);
835 
836  bool isPrototyped = true;
837  if (Elements.size() == 2 && !Elements[1])
838  isPrototyped = false;
839 
840  constructSubprogramArguments(Buffer, Elements);
841 
842  // Add prototype flag if we're dealing with a C language and the function has
843  // been prototyped.
844  uint16_t Language = getLanguage();
845  if (isPrototyped &&
846  (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
847  Language == dwarf::DW_LANG_ObjC))
848  addFlag(Buffer, dwarf::DW_AT_prototyped);
849 
850  // Add a DW_AT_calling_convention if this has an explicit convention.
851  if (CTy->getCC() && CTy->getCC() != dwarf::DW_CC_normal)
852  addUInt(Buffer, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1,
853  CTy->getCC());
854 
855  if (CTy->isLValueReference())
856  addFlag(Buffer, dwarf::DW_AT_reference);
857 
858  if (CTy->isRValueReference())
859  addFlag(Buffer, dwarf::DW_AT_rvalue_reference);
860 }
861 
863  // Add name if not anonymous or intermediate type.
864  StringRef Name = CTy->getName();
865 
866  uint64_t Size = CTy->getSizeInBits() >> 3;
867  uint16_t Tag = Buffer.getTag();
868 
869  switch (Tag) {
870  case dwarf::DW_TAG_array_type:
871  constructArrayTypeDIE(Buffer, CTy);
872  break;
873  case dwarf::DW_TAG_enumeration_type:
874  constructEnumTypeDIE(Buffer, CTy);
875  break;
876  case dwarf::DW_TAG_variant_part:
877  case dwarf::DW_TAG_structure_type:
878  case dwarf::DW_TAG_union_type:
879  case dwarf::DW_TAG_class_type: {
880  // Emit the discriminator for a variant part.
881  DIDerivedType *Discriminator = nullptr;
882  if (Tag == dwarf::DW_TAG_variant_part) {
883  Discriminator = CTy->getDiscriminator();
884  if (Discriminator) {
885  // DWARF says:
886  // If the variant part has a discriminant, the discriminant is
887  // represented by a separate debugging information entry which is
888  // a child of the variant part entry.
889  DIE &DiscMember = constructMemberDIE(Buffer, Discriminator);
890  addDIEEntry(Buffer, dwarf::DW_AT_discr, DiscMember);
891  }
892  }
893 
894  // Add elements to structure type.
895  DINodeArray Elements = CTy->getElements();
896  for (const auto *Element : Elements) {
897  if (!Element)
898  continue;
899  if (auto *SP = dyn_cast<DISubprogram>(Element))
901  else if (auto *DDTy = dyn_cast<DIDerivedType>(Element)) {
902  if (DDTy->getTag() == dwarf::DW_TAG_friend) {
903  DIE &ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
904  addType(ElemDie, DDTy->getBaseType(), dwarf::DW_AT_friend);
905  } else if (DDTy->isStaticMember()) {
907  } else if (Tag == dwarf::DW_TAG_variant_part) {
908  // When emitting a variant part, wrap each member in
909  // DW_TAG_variant.
910  DIE &Variant = createAndAddDIE(dwarf::DW_TAG_variant, Buffer);
911  if (const ConstantInt *CI =
912  dyn_cast_or_null<ConstantInt>(DDTy->getDiscriminantValue())) {
913  if (isUnsignedDIType(DD, Discriminator->getBaseType()))
914  addUInt(Variant, dwarf::DW_AT_discr_value, None, CI->getZExtValue());
915  else
916  addSInt(Variant, dwarf::DW_AT_discr_value, None, CI->getSExtValue());
917  }
918  constructMemberDIE(Variant, DDTy);
919  } else {
920  constructMemberDIE(Buffer, DDTy);
921  }
922  } else if (auto *Property = dyn_cast<DIObjCProperty>(Element)) {
923  DIE &ElemDie = createAndAddDIE(Property->getTag(), Buffer);
924  StringRef PropertyName = Property->getName();
925  addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
926  if (Property->getType())
927  addType(ElemDie, Property->getType());
928  addSourceLine(ElemDie, Property);
929  StringRef GetterName = Property->getGetterName();
930  if (!GetterName.empty())
931  addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
932  StringRef SetterName = Property->getSetterName();
933  if (!SetterName.empty())
934  addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
935  if (unsigned PropertyAttributes = Property->getAttributes())
936  addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, None,
937  PropertyAttributes);
938  } else if (auto *Composite = dyn_cast<DICompositeType>(Element)) {
939  if (Composite->getTag() == dwarf::DW_TAG_variant_part) {
940  DIE &VariantPart = createAndAddDIE(Composite->getTag(), Buffer);
941  constructTypeDIE(VariantPart, Composite);
942  }
943  }
944  }
945 
946  if (CTy->isAppleBlockExtension())
947  addFlag(Buffer, dwarf::DW_AT_APPLE_block);
948 
949  if (CTy->getExportSymbols())
950  addFlag(Buffer, dwarf::DW_AT_export_symbols);
951 
952  // This is outside the DWARF spec, but GDB expects a DW_AT_containing_type
953  // inside C++ composite types to point to the base class with the vtable.
954  // Rust uses DW_AT_containing_type to link a vtable to the type
955  // for which it was created.
956  if (auto *ContainingType = CTy->getVTableHolder())
957  addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
958  *getOrCreateTypeDIE(ContainingType));
959 
960  if (CTy->isObjcClassComplete())
961  addFlag(Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
962 
963  // Add template parameters to a class, structure or union types.
964  // FIXME: The support isn't in the metadata for this yet.
965  if (Tag == dwarf::DW_TAG_class_type ||
966  Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
967  addTemplateParams(Buffer, CTy->getTemplateParams());
968 
969  // Add the type's non-standard calling convention.
970  uint8_t CC = 0;
971  if (CTy->isTypePassByValue())
972  CC = dwarf::DW_CC_pass_by_value;
973  else if (CTy->isTypePassByReference())
974  CC = dwarf::DW_CC_pass_by_reference;
975  if (CC)
976  addUInt(Buffer, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1,
977  CC);
978  break;
979  }
980  default:
981  break;
982  }
983 
984  // Add name if not anonymous or intermediate type.
985  if (!Name.empty())
986  addString(Buffer, dwarf::DW_AT_name, Name);
987 
988  if (Tag == dwarf::DW_TAG_enumeration_type ||
989  Tag == dwarf::DW_TAG_class_type || Tag == dwarf::DW_TAG_structure_type ||
990  Tag == dwarf::DW_TAG_union_type) {
991  // Add size if non-zero (derived types might be zero-sized.)
992  // TODO: Do we care about size for enum forward declarations?
993  if (Size)
994  addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
995  else if (!CTy->isForwardDecl())
996  // Add zero size if it is not a forward declaration.
997  addUInt(Buffer, dwarf::DW_AT_byte_size, None, 0);
998 
999  // If we're a forward decl, say so.
1000  if (CTy->isForwardDecl())
1001  addFlag(Buffer, dwarf::DW_AT_declaration);
1002 
1003  // Add source line info if available.
1004  if (!CTy->isForwardDecl())
1005  addSourceLine(Buffer, CTy);
1006 
1007  // No harm in adding the runtime language to the declaration.
1008  unsigned RLang = CTy->getRuntimeLang();
1009  if (RLang)
1010  addUInt(Buffer, dwarf::DW_AT_APPLE_runtime_class, dwarf::DW_FORM_data1,
1011  RLang);
1012 
1013  // Add align info if available.
1014  if (uint32_t AlignInBytes = CTy->getAlignInBytes())
1015  addUInt(Buffer, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
1016  AlignInBytes);
1017  }
1018 }
1019 
1020 void DwarfUnit::constructTemplateTypeParameterDIE(
1021  DIE &Buffer, const DITemplateTypeParameter *TP) {
1022  DIE &ParamDIE =
1023  createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
1024  // Add the type if it exists, it could be void and therefore no type.
1025  if (TP->getType())
1026  addType(ParamDIE, TP->getType());
1027  if (!TP->getName().empty())
1028  addString(ParamDIE, dwarf::DW_AT_name, TP->getName());
1029 }
1030 
1031 void DwarfUnit::constructTemplateValueParameterDIE(
1032  DIE &Buffer, const DITemplateValueParameter *VP) {
1033  DIE &ParamDIE = createAndAddDIE(VP->getTag(), Buffer);
1034 
1035  // Add the type if there is one, template template and template parameter
1036  // packs will not have a type.
1037  if (VP->getTag() == dwarf::DW_TAG_template_value_parameter)
1038  addType(ParamDIE, VP->getType());
1039  if (!VP->getName().empty())
1040  addString(ParamDIE, dwarf::DW_AT_name, VP->getName());
1041  if (Metadata *Val = VP->getValue()) {
1042  if (ConstantInt *CI = mdconst::dyn_extract<ConstantInt>(Val))
1043  addConstantValue(ParamDIE, CI, VP->getType());
1044  else if (GlobalValue *GV = mdconst::dyn_extract<GlobalValue>(Val)) {
1045  // We cannot describe the location of dllimport'd entities: the
1046  // computation of their address requires loads from the IAT.
1047  if (!GV->hasDLLImportStorageClass()) {
1048  // For declaration non-type template parameters (such as global values
1049  // and functions)
1050  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1051  addOpAddress(*Loc, Asm->getSymbol(GV));
1052  // Emit DW_OP_stack_value to use the address as the immediate value of
1053  // the parameter, rather than a pointer to it.
1054  addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
1055  addBlock(ParamDIE, dwarf::DW_AT_location, Loc);
1056  }
1057  } else if (VP->getTag() == dwarf::DW_TAG_GNU_template_template_param) {
1058  assert(isa<MDString>(Val));
1059  addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
1060  cast<MDString>(Val)->getString());
1061  } else if (VP->getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
1062  addTemplateParams(ParamDIE, cast<MDTuple>(Val));
1063  }
1064  }
1065 }
1066 
1068  // Construct the context before querying for the existence of the DIE in case
1069  // such construction creates the DIE.
1070  DIE *ContextDIE = getOrCreateContextDIE(NS->getScope());
1071 
1072  if (DIE *NDie = getDIE(NS))
1073  return NDie;
1074  DIE &NDie = createAndAddDIE(dwarf::DW_TAG_namespace, *ContextDIE, NS);
1075 
1076  StringRef Name = NS->getName();
1077  if (!Name.empty())
1078  addString(NDie, dwarf::DW_AT_name, NS->getName());
1079  else
1080  Name = "(anonymous namespace)";
1081  DD->addAccelNamespace(*CUNode, Name, NDie);
1082  addGlobalName(Name, NDie, NS->getScope());
1083  if (NS->getExportSymbols())
1084  addFlag(NDie, dwarf::DW_AT_export_symbols);
1085  return &NDie;
1086 }
1087 
1089  // Construct the context before querying for the existence of the DIE in case
1090  // such construction creates the DIE.
1091  DIE *ContextDIE = getOrCreateContextDIE(M->getScope());
1092 
1093  if (DIE *MDie = getDIE(M))
1094  return MDie;
1095  DIE &MDie = createAndAddDIE(dwarf::DW_TAG_module, *ContextDIE, M);
1096 
1097  if (!M->getName().empty()) {
1098  addString(MDie, dwarf::DW_AT_name, M->getName());
1099  addGlobalName(M->getName(), MDie, M->getScope());
1100  }
1101  if (!M->getConfigurationMacros().empty())
1102  addString(MDie, dwarf::DW_AT_LLVM_config_macros,
1103  M->getConfigurationMacros());
1104  if (!M->getIncludePath().empty())
1105  addString(MDie, dwarf::DW_AT_LLVM_include_path, M->getIncludePath());
1106  if (!M->getISysRoot().empty())
1107  addString(MDie, dwarf::DW_AT_LLVM_isysroot, M->getISysRoot());
1108 
1109  return &MDie;
1110 }
1111 
1113  // Construct the context before querying for the existence of the DIE in case
1114  // such construction creates the DIE (as is the case for member function
1115  // declarations).
1116  DIE *ContextDIE =
1117  Minimal ? &getUnitDie() : getOrCreateContextDIE(SP->getScope());
1118 
1119  if (DIE *SPDie = getDIE(SP))
1120  return SPDie;
1121 
1122  if (auto *SPDecl = SP->getDeclaration()) {
1123  if (!Minimal) {
1124  // Add subprogram definitions to the CU die directly.
1125  ContextDIE = &getUnitDie();
1126  // Build the decl now to ensure it precedes the definition.
1127  getOrCreateSubprogramDIE(SPDecl);
1128  }
1129  }
1130 
1131  // DW_TAG_inlined_subroutine may refer to this DIE.
1132  DIE &SPDie = createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, SP);
1133 
1134  // Stop here and fill this in later, depending on whether or not this
1135  // subprogram turns out to have inlined instances or not.
1136  if (SP->isDefinition())
1137  return &SPDie;
1138 
1139  static_cast<DwarfUnit *>(SPDie.getUnit())
1140  ->applySubprogramAttributes(SP, SPDie);
1141  return &SPDie;
1142 }
1143 
1145  DIE &SPDie) {
1146  DIE *DeclDie = nullptr;
1147  StringRef DeclLinkageName;
1148  if (auto *SPDecl = SP->getDeclaration()) {
1149  DeclDie = getDIE(SPDecl);
1150  assert(DeclDie && "This DIE should've already been constructed when the "
1151  "definition DIE was created in "
1152  "getOrCreateSubprogramDIE");
1153  // Look at the Decl's linkage name only if we emitted it.
1154  if (DD->useAllLinkageNames())
1155  DeclLinkageName = SPDecl->getLinkageName();
1156  unsigned DeclID = getOrCreateSourceID(SPDecl->getFile());
1157  unsigned DefID = getOrCreateSourceID(SP->getFile());
1158  if (DeclID != DefID)
1159  addUInt(SPDie, dwarf::DW_AT_decl_file, None, DefID);
1160 
1161  if (SP->getLine() != SPDecl->getLine())
1162  addUInt(SPDie, dwarf::DW_AT_decl_line, None, SP->getLine());
1163  }
1164 
1165  // Add function template parameters.
1166  addTemplateParams(SPDie, SP->getTemplateParams());
1167 
1168  // Add the linkage name if we have one and it isn't in the Decl.
1169  StringRef LinkageName = SP->getLinkageName();
1170  assert(((LinkageName.empty() || DeclLinkageName.empty()) ||
1171  LinkageName == DeclLinkageName) &&
1172  "decl has a linkage name and it is different");
1173  if (DeclLinkageName.empty() &&
1174  // Always emit it for abstract subprograms.
1175  (DD->useAllLinkageNames() || DU->getAbstractSPDies().lookup(SP)))
1176  addLinkageName(SPDie, LinkageName);
1177 
1178  if (!DeclDie)
1179  return false;
1180 
1181  // Refer to the function declaration where all the other attributes will be
1182  // found.
1183  addDIEEntry(SPDie, dwarf::DW_AT_specification, *DeclDie);
1184  return true;
1185 }
1186 
1188  bool SkipSPAttributes) {
1189  // If -fdebug-info-for-profiling is enabled, need to emit the subprogram
1190  // and its source location.
1191  bool SkipSPSourceLocation = SkipSPAttributes &&
1193  if (!SkipSPSourceLocation)
1194  if (applySubprogramDefinitionAttributes(SP, SPDie))
1195  return;
1196 
1197  // Constructors and operators for anonymous aggregates do not have names.
1198  if (!SP->getName().empty())
1199  addString(SPDie, dwarf::DW_AT_name, SP->getName());
1200 
1201  if (!SkipSPSourceLocation)
1202  addSourceLine(SPDie, SP);
1203 
1204  // Skip the rest of the attributes under -gmlt to save space.
1205  if (SkipSPAttributes)
1206  return;
1207 
1208  // Add the prototype if we have a prototype and we have a C like
1209  // language.
1210  uint16_t Language = getLanguage();
1211  if (SP->isPrototyped() &&
1212  (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1213  Language == dwarf::DW_LANG_ObjC))
1214  addFlag(SPDie, dwarf::DW_AT_prototyped);
1215 
1216  unsigned CC = 0;
1218  if (const DISubroutineType *SPTy = SP->getType()) {
1219  Args = SPTy->getTypeArray();
1220  CC = SPTy->getCC();
1221  }
1222 
1223  // Add a DW_AT_calling_convention if this has an explicit convention.
1224  if (CC && CC != dwarf::DW_CC_normal)
1225  addUInt(SPDie, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1, CC);
1226 
1227  // Add a return type. If this is a type like a C/C++ void type we don't add a
1228  // return type.
1229  if (Args.size())
1230  if (auto Ty = Args[0])
1231  addType(SPDie, Ty);
1232 
1233  unsigned VK = SP->getVirtuality();
1234  if (VK) {
1235  addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
1236  if (SP->getVirtualIndex() != -1u) {
1237  DIELoc *Block = getDIELoc();
1238  addUInt(*Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1239  addUInt(*Block, dwarf::DW_FORM_udata, SP->getVirtualIndex());
1240  addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, Block);
1241  }
1242  ContainingTypeMap.insert(std::make_pair(&SPDie, SP->getContainingType()));
1243  }
1244 
1245  if (!SP->isDefinition()) {
1246  addFlag(SPDie, dwarf::DW_AT_declaration);
1247 
1248  // Add arguments. Do not add arguments for subprogram definition. They will
1249  // be handled while processing variables.
1250  constructSubprogramArguments(SPDie, Args);
1251  }
1252 
1253  addThrownTypes(SPDie, SP->getThrownTypes());
1254 
1255  if (SP->isArtificial())
1256  addFlag(SPDie, dwarf::DW_AT_artificial);
1257 
1258  if (!SP->isLocalToUnit())
1259  addFlag(SPDie, dwarf::DW_AT_external);
1260 
1262  if (SP->isOptimized())
1263  addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
1264 
1265  if (unsigned isa = Asm->getISAEncoding())
1266  addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
1267  }
1268 
1269  if (SP->isLValueReference())
1270  addFlag(SPDie, dwarf::DW_AT_reference);
1271 
1272  if (SP->isRValueReference())
1273  addFlag(SPDie, dwarf::DW_AT_rvalue_reference);
1274 
1275  if (SP->isNoReturn())
1276  addFlag(SPDie, dwarf::DW_AT_noreturn);
1277 
1278  if (SP->isProtected())
1279  addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1281  else if (SP->isPrivate())
1282  addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1284  else if (SP->isPublic())
1285  addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1287 
1288  if (SP->isExplicit())
1289  addFlag(SPDie, dwarf::DW_AT_explicit);
1290 
1291  if (SP->isMainSubprogram())
1292  addFlag(SPDie, dwarf::DW_AT_main_subprogram);
1293  if (SP->isPure())
1294  addFlag(SPDie, dwarf::DW_AT_pure);
1295  if (SP->isElemental())
1296  addFlag(SPDie, dwarf::DW_AT_elemental);
1297  if (SP->isRecursive())
1298  addFlag(SPDie, dwarf::DW_AT_recursive);
1299 }
1300 
1301 void DwarfUnit::constructSubrangeDIE(DIE &Buffer, const DISubrange *SR,
1302  DIE *IndexTy) {
1303  DIE &DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
1304  addDIEEntry(DW_Subrange, dwarf::DW_AT_type, *IndexTy);
1305 
1306  // The LowerBound value defines the lower bounds which is typically zero for
1307  // C/C++. The Count value is the number of elements. Values are 64 bit. If
1308  // Count == -1 then the array is unbounded and we do not emit
1309  // DW_AT_lower_bound and DW_AT_count attributes.
1310  int64_t LowerBound = SR->getLowerBound();
1311  int64_t DefaultLowerBound = getDefaultLowerBound();
1312  int64_t Count = -1;
1313  if (auto *CI = SR->getCount().dyn_cast<ConstantInt*>())
1314  Count = CI->getSExtValue();
1315 
1316  if (DefaultLowerBound == -1 || LowerBound != DefaultLowerBound)
1317  addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, None, LowerBound);
1318 
1319  if (auto *CV = SR->getCount().dyn_cast<DIVariable*>()) {
1320  if (auto *CountVarDIE = getDIE(CV))
1321  addDIEEntry(DW_Subrange, dwarf::DW_AT_count, *CountVarDIE);
1322  } else if (Count != -1)
1323  addUInt(DW_Subrange, dwarf::DW_AT_count, None, Count);
1324 }
1325 
1326 DIE *DwarfUnit::getIndexTyDie() {
1327  if (IndexTyDie)
1328  return IndexTyDie;
1329  // Construct an integer type to use for indexes.
1330  IndexTyDie = &createAndAddDIE(dwarf::DW_TAG_base_type, getUnitDie());
1331  StringRef Name = "__ARRAY_SIZE_TYPE__";
1332  addString(*IndexTyDie, dwarf::DW_AT_name, Name);
1333  addUInt(*IndexTyDie, dwarf::DW_AT_byte_size, None, sizeof(int64_t));
1334  addUInt(*IndexTyDie, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1335  dwarf::DW_ATE_unsigned);
1336  DD->addAccelType(*CUNode, Name, *IndexTyDie, /*Flags*/ 0);
1337  return IndexTyDie;
1338 }
1339 
1340 /// Returns true if the vector's size differs from the sum of sizes of elements
1341 /// the user specified. This can occur if the vector has been rounded up to
1342 /// fit memory alignment constraints.
1343 static bool hasVectorBeenPadded(const DICompositeType *CTy) {
1344  assert(CTy && CTy->isVector() && "Composite type is not a vector");
1345  const uint64_t ActualSize = CTy->getSizeInBits();
1346 
1347  // Obtain the size of each element in the vector.
1348  DIType *BaseTy = CTy->getBaseType();
1349  assert(BaseTy && "Unknown vector element type.");
1350  const uint64_t ElementSize = BaseTy->getSizeInBits();
1351 
1352  // Locate the number of elements in the vector.
1353  const DINodeArray Elements = CTy->getElements();
1354  assert(Elements.size() == 1 &&
1355  Elements[0]->getTag() == dwarf::DW_TAG_subrange_type &&
1356  "Invalid vector element array, expected one element of type subrange");
1357  const auto Subrange = cast<DISubrange>(Elements[0]);
1358  const auto CI = Subrange->getCount().get<ConstantInt *>();
1359  const int32_t NumVecElements = CI->getSExtValue();
1360 
1361  // Ensure we found the element count and that the actual size is wide
1362  // enough to contain the requested size.
1363  assert(ActualSize >= (NumVecElements * ElementSize) && "Invalid vector size");
1364  return ActualSize != (NumVecElements * ElementSize);
1365 }
1366 
1367 void DwarfUnit::constructArrayTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
1368  if (CTy->isVector()) {
1369  addFlag(Buffer, dwarf::DW_AT_GNU_vector);
1370  if (hasVectorBeenPadded(CTy))
1371  addUInt(Buffer, dwarf::DW_AT_byte_size, None,
1372  CTy->getSizeInBits() / CHAR_BIT);
1373  }
1374 
1375  // Emit the element type.
1376  addType(Buffer, CTy->getBaseType());
1377 
1378  // Get an anonymous type for index type.
1379  // FIXME: This type should be passed down from the front end
1380  // as different languages may have different sizes for indexes.
1381  DIE *IdxTy = getIndexTyDie();
1382 
1383  // Add subranges to array type.
1384  DINodeArray Elements = CTy->getElements();
1385  for (unsigned i = 0, N = Elements.size(); i < N; ++i) {
1386  // FIXME: Should this really be such a loose cast?
1387  if (auto *Element = dyn_cast_or_null<DINode>(Elements[i]))
1388  if (Element->getTag() == dwarf::DW_TAG_subrange_type)
1389  constructSubrangeDIE(Buffer, cast<DISubrange>(Element), IdxTy);
1390  }
1391 }
1392 
1393 void DwarfUnit::constructEnumTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
1394  const DIType *DTy = CTy->getBaseType();
1395  bool IsUnsigned = DTy && isUnsignedDIType(DD, DTy);
1396  if (DTy) {
1397  if (DD->getDwarfVersion() >= 3)
1398  addType(Buffer, DTy);
1399  if (DD->getDwarfVersion() >= 4 && (CTy->getFlags() & DINode::FlagEnumClass))
1400  addFlag(Buffer, dwarf::DW_AT_enum_class);
1401  }
1402 
1403  auto *Context = CTy->getScope();
1404  bool IndexEnumerators = !Context || isa<DICompileUnit>(Context) || isa<DIFile>(Context) ||
1405  isa<DINamespace>(Context) || isa<DICommonBlock>(Context);
1406  DINodeArray Elements = CTy->getElements();
1407 
1408  // Add enumerators to enumeration type.
1409  for (unsigned i = 0, N = Elements.size(); i < N; ++i) {
1410  auto *Enum = dyn_cast_or_null<DIEnumerator>(Elements[i]);
1411  if (Enum) {
1412  DIE &Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
1413  StringRef Name = Enum->getName();
1414  addString(Enumerator, dwarf::DW_AT_name, Name);
1415  auto Value = static_cast<uint64_t>(Enum->getValue());
1416  addConstantValue(Enumerator, IsUnsigned, Value);
1417  if (IndexEnumerators)
1418  addGlobalName(Name, Enumerator, Context);
1419  }
1420  }
1421 }
1422 
1424  for (auto CI = ContainingTypeMap.begin(), CE = ContainingTypeMap.end();
1425  CI != CE; ++CI) {
1426  DIE &SPDie = *CI->first;
1427  const DINode *D = CI->second;
1428  if (!D)
1429  continue;
1430  DIE *NDie = getDIE(D);
1431  if (!NDie)
1432  continue;
1433  addDIEEntry(SPDie, dwarf::DW_AT_containing_type, *NDie);
1434  }
1435 }
1436 
1437 DIE &DwarfUnit::constructMemberDIE(DIE &Buffer, const DIDerivedType *DT) {
1438  DIE &MemberDie = createAndAddDIE(DT->getTag(), Buffer);
1439  StringRef Name = DT->getName();
1440  if (!Name.empty())
1441  addString(MemberDie, dwarf::DW_AT_name, Name);
1442 
1443  if (DIType *Resolved = DT->getBaseType())
1444  addType(MemberDie, Resolved);
1445 
1446  addSourceLine(MemberDie, DT);
1447 
1448  if (DT->getTag() == dwarf::DW_TAG_inheritance && DT->isVirtual()) {
1449 
1450  // For C++, virtual base classes are not at fixed offset. Use following
1451  // expression to extract appropriate offset from vtable.
1452  // BaseAddr = ObAddr + *((*ObAddr) - Offset)
1453 
1454  DIELoc *VBaseLocationDie = new (DIEValueAllocator) DIELoc;
1455  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
1456  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1457  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1458  addUInt(*VBaseLocationDie, dwarf::DW_FORM_udata, DT->getOffsetInBits());
1459  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
1460  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1461  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1462 
1463  addBlock(MemberDie, dwarf::DW_AT_data_member_location, VBaseLocationDie);
1464  } else {
1465  uint64_t Size = DT->getSizeInBits();
1466  uint64_t FieldSize = DD->getBaseTypeSize(DT);
1467  uint32_t AlignInBytes = DT->getAlignInBytes();
1468  uint64_t OffsetInBytes;
1469 
1470  bool IsBitfield = FieldSize && Size != FieldSize;
1471  if (IsBitfield) {
1472  // Handle bitfield, assume bytes are 8 bits.
1473  if (DD->useDWARF2Bitfields())
1474  addUInt(MemberDie, dwarf::DW_AT_byte_size, None, FieldSize/8);
1475  addUInt(MemberDie, dwarf::DW_AT_bit_size, None, Size);
1476 
1477  uint64_t Offset = DT->getOffsetInBits();
1478  // We can't use DT->getAlignInBits() here: AlignInBits for member type
1479  // is non-zero if and only if alignment was forced (e.g. _Alignas()),
1480  // which can't be done with bitfields. Thus we use FieldSize here.
1481  uint32_t AlignInBits = FieldSize;
1482  uint32_t AlignMask = ~(AlignInBits - 1);
1483  // The bits from the start of the storage unit to the start of the field.
1484  uint64_t StartBitOffset = Offset - (Offset & AlignMask);
1485  // The byte offset of the field's aligned storage unit inside the struct.
1486  OffsetInBytes = (Offset - StartBitOffset) / 8;
1487 
1488  if (DD->useDWARF2Bitfields()) {
1489  uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1490  uint64_t FieldOffset = (HiMark - FieldSize);
1491  Offset -= FieldOffset;
1492 
1493  // Maybe we need to work from the other end.
1494  if (Asm->getDataLayout().isLittleEndian())
1495  Offset = FieldSize - (Offset + Size);
1496 
1497  addUInt(MemberDie, dwarf::DW_AT_bit_offset, None, Offset);
1498  OffsetInBytes = FieldOffset >> 3;
1499  } else {
1500  addUInt(MemberDie, dwarf::DW_AT_data_bit_offset, None, Offset);
1501  }
1502  } else {
1503  // This is not a bitfield.
1504  OffsetInBytes = DT->getOffsetInBits() / 8;
1505  if (AlignInBytes)
1506  addUInt(MemberDie, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
1507  AlignInBytes);
1508  }
1509 
1510  if (DD->getDwarfVersion() <= 2) {
1511  DIELoc *MemLocationDie = new (DIEValueAllocator) DIELoc;
1512  addUInt(*MemLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
1513  addUInt(*MemLocationDie, dwarf::DW_FORM_udata, OffsetInBytes);
1514  addBlock(MemberDie, dwarf::DW_AT_data_member_location, MemLocationDie);
1515  } else if (!IsBitfield || DD->useDWARF2Bitfields())
1516  addUInt(MemberDie, dwarf::DW_AT_data_member_location, None,
1517  OffsetInBytes);
1518  }
1519 
1520  if (DT->isProtected())
1521  addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1523  else if (DT->isPrivate())
1524  addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1526  // Otherwise C++ member and base classes are considered public.
1527  else if (DT->isPublic())
1528  addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1530  if (DT->isVirtual())
1531  addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
1532  dwarf::DW_VIRTUALITY_virtual);
1533 
1534  // Objective-C properties.
1535  if (DINode *PNode = DT->getObjCProperty())
1536  if (DIE *PDie = getDIE(PNode))
1537  MemberDie.addValue(DIEValueAllocator, dwarf::DW_AT_APPLE_property,
1538  dwarf::DW_FORM_ref4, DIEEntry(*PDie));
1539 
1540  if (DT->isArtificial())
1541  addFlag(MemberDie, dwarf::DW_AT_artificial);
1542 
1543  return MemberDie;
1544 }
1545 
1547  if (!DT)
1548  return nullptr;
1549 
1550  // Construct the context before querying for the existence of the DIE in case
1551  // such construction creates the DIE.
1552  DIE *ContextDIE = getOrCreateContextDIE(DT->getScope());
1553  assert(dwarf::isType(ContextDIE->getTag()) &&
1554  "Static member should belong to a type.");
1555 
1556  if (DIE *StaticMemberDIE = getDIE(DT))
1557  return StaticMemberDIE;
1558 
1559  DIE &StaticMemberDIE = createAndAddDIE(DT->getTag(), *ContextDIE, DT);
1560 
1561  const DIType *Ty = DT->getBaseType();
1562 
1563  addString(StaticMemberDIE, dwarf::DW_AT_name, DT->getName());
1564  addType(StaticMemberDIE, Ty);
1565  addSourceLine(StaticMemberDIE, DT);
1566  addFlag(StaticMemberDIE, dwarf::DW_AT_external);
1567  addFlag(StaticMemberDIE, dwarf::DW_AT_declaration);
1568 
1569  // FIXME: We could omit private if the parent is a class_type, and
1570  // public if the parent is something else.
1571  if (DT->isProtected())
1572  addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1574  else if (DT->isPrivate())
1575  addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1577  else if (DT->isPublic())
1578  addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1580 
1581  if (const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DT->getConstant()))
1582  addConstantValue(StaticMemberDIE, CI, Ty);
1583  if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT->getConstant()))
1584  addConstantFPValue(StaticMemberDIE, CFP);
1585 
1586  if (uint32_t AlignInBytes = DT->getAlignInBytes())
1587  addUInt(StaticMemberDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
1588  AlignInBytes);
1589 
1590  return &StaticMemberDIE;
1591 }
1592 
1594  // Emit size of content not including length itself
1595  Asm->OutStreamer->AddComment("Length of Unit");
1596  if (!DD->useSectionsAsReferences()) {
1597  StringRef Prefix = isDwoUnit() ? "debug_info_dwo_" : "debug_info_";
1598  MCSymbol *BeginLabel = Asm->createTempSymbol(Prefix + "start");
1599  EndLabel = Asm->createTempSymbol(Prefix + "end");
1600  Asm->EmitLabelDifference(EndLabel, BeginLabel, 4);
1601  Asm->OutStreamer->EmitLabel(BeginLabel);
1602  } else
1603  Asm->emitInt32(getHeaderSize() + getUnitDie().getSize());
1604 
1605  Asm->OutStreamer->AddComment("DWARF version number");
1606  unsigned Version = DD->getDwarfVersion();
1607  Asm->emitInt16(Version);
1608 
1609  // DWARF v5 reorders the address size and adds a unit type.
1610  if (Version >= 5) {
1611  Asm->OutStreamer->AddComment("DWARF Unit Type");
1612  Asm->emitInt8(UT);
1613  Asm->OutStreamer->AddComment("Address Size (in bytes)");
1615  }
1616 
1617  // We share one abbreviations table across all units so it's always at the
1618  // start of the section. Use a relocatable offset where needed to ensure
1619  // linking doesn't invalidate that offset.
1620  Asm->OutStreamer->AddComment("Offset Into Abbrev. Section");
1622  if (UseOffsets)
1623  Asm->emitInt32(0);
1624  else
1626  TLOF.getDwarfAbbrevSection()->getBeginSymbol(), false);
1627 
1628  if (Version <= 4) {
1629  Asm->OutStreamer->AddComment("Address Size (in bytes)");
1631  }
1632 }
1633 
1634 void DwarfTypeUnit::emitHeader(bool UseOffsets) {
1635  DwarfUnit::emitCommonHeader(UseOffsets,
1636  DD->useSplitDwarf() ? dwarf::DW_UT_split_type
1637  : dwarf::DW_UT_type);
1638  Asm->OutStreamer->AddComment("Type Signature");
1639  Asm->OutStreamer->EmitIntValue(TypeSignature, sizeof(TypeSignature));
1640  Asm->OutStreamer->AddComment("Type DIE Offset");
1641  // In a skeleton type unit there is no type DIE so emit a zero offset.
1642  Asm->OutStreamer->EmitIntValue(Ty ? Ty->getOffset() : 0,
1643  sizeof(Ty->getOffset()));
1644 }
1645 
1648  const MCSymbol *Hi, const MCSymbol *Lo) {
1649  return Die.addValue(DIEValueAllocator, Attribute,
1650  DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
1651  : dwarf::DW_FORM_data4,
1652  new (DIEValueAllocator) DIEDelta(Hi, Lo));
1653 }
1654 
1657  const MCSymbol *Label, const MCSymbol *Sec) {
1659  return addLabel(Die, Attribute,
1660  DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
1661  : dwarf::DW_FORM_data4,
1662  Label);
1663  return addSectionDelta(Die, Attribute, Label, Sec);
1664 }
1665 
1666 bool DwarfTypeUnit::isDwoUnit() const {
1667  // Since there are no skeleton type units, all type units are dwo type units
1668  // when split DWARF is being used.
1669  return DD->useSplitDwarf();
1670 }
1671 
1673  const DIScope *Context) {
1674  getCU().addGlobalNameForTypeUnit(Name, Context);
1675 }
1676 
1677 void DwarfTypeUnit::addGlobalType(const DIType *Ty, const DIE &Die,
1678  const DIScope *Context) {
1679  getCU().addGlobalTypeUnitType(Ty, Context);
1680 }
1681 
1682 const MCSymbol *DwarfUnit::getCrossSectionRelativeBaseAddress() const {
1684  return nullptr;
1685  if (isDwoUnit())
1686  return nullptr;
1687  return getSection()->getBeginSymbol();
1688 }
1689 
1692  addSectionLabel(getUnitDie(), dwarf::DW_AT_str_offsets_base,
1695 }
1696 
1698  assert(DD->getDwarfVersion() >= 5 &&
1699  "DW_AT_rnglists_base requires DWARF version 5 or later");
1701  addSectionLabel(getUnitDie(), dwarf::DW_AT_rnglists_base,
1703  TLOF.getDwarfRnglistsSection()->getBeginSymbol());
1704 }
1705 
1707  assert(DD->getDwarfVersion() >= 5 &&
1708  "DW_AT_loclists_base requires DWARF version 5 or later");
1710  addSectionLabel(getUnitDie(), dwarf::DW_AT_loclists_base,
1712  TLOF.getDwarfLoclistsSection()->getBeginSymbol());
1713 }
1714 
1715 void DwarfTypeUnit::finishNonUnitTypeDIE(DIE& D, const DICompositeType *CTy) {
1716  addFlag(D, dwarf::DW_AT_declaration);
1717  StringRef Name = CTy->getName();
1718  if (!Name.empty())
1719  addString(D, dwarf::DW_AT_name, Name);
1720  getCU().createTypeDIE(CTy);
1721 }
DIFlags getFlags() const
const DICompileUnit * getCUNode() const
Definition: DwarfUnit.h:89
const TargetLoweringObjectFile & getObjFileLowering() const
Return information about object file lowering.
Definition: AsmPrinter.cpp:215
DIE::value_iterator addSectionDelta(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Hi, const MCSymbol *Lo)
addSectionDelta - Add a label delta attribute data and value.
Definition: DwarfUnit.cpp:1647
MCSection * getDwarfStrOffSection() const
static bool isUnsignedDIType(DwarfDebug *DD, const DIType *Ty)
Return true if type encoding is unsigned.
Definition: DwarfUnit.cpp:451
uint64_t getOffsetInBits() const
bool isPrivate() const
void addFlag(DIE &Die, dwarf::Attribute Attribute)
Add a flag that is true to the DIE.
Definition: DwarfUnit.cpp:212
static GCMetadataPrinterRegistry::Add< ErlangGCPrinter > X("erlang", "erlang-compatible garbage collector")
bool isTypePassByValue() const
uint64_t getZExtValue() const
Get zero extended value.
Definition: APInt.h:1571
LLVMContext & Context
void addLabelDelta(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Hi, const MCSymbol *Lo)
Add a label delta attribute data and value.
Definition: DwarfUnit.cpp:349
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:93
StringRef getName() const
std::vector< DIELoc * > DIELocs
A list of all the DIELocs in use.
Definition: DwarfUnit.h:69
DIELoc - Represents an expression location.
Definition: DIE.h:891
This class represents lattice values for constants.
Definition: AllocatorList.h:23
StringRef getName() const
DIE * getOrCreateStaticMemberDIE(const DIDerivedType *DT)
Create new static data member DIE.
Definition: DwarfUnit.cpp:1546
void addOpAddress(DIELoc &Die, const MCSymbol *Sym)
Add a dwarf op address data and value using the form given and an op of either DW_FORM_addr or DW_FOR...
Definition: DwarfUnit.cpp:331
bool isVirtual() const
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:41
unsigned size() const
NonTypeUnitContext enterNonTypeUnitContext()
amdgpu Simplify well known AMD library false FunctionCallee Value const Twine & Name
MCContext & OutContext
This is the context for the output file that we are streaming.
Definition: AsmPrinter.h:88
DIFile * getFile() const
Attribute
Attributes.
Definition: Dwarf.h:102
void addThrownTypes(DIE &Die, DINodeArray ThrownTypes)
Add thrown types.
Definition: DwarfUnit.cpp:601
This provides a very simple, boring adaptor for a begin and end iterator into a range type...
void insertDIE(const DINode *Desc, DIE *D)
Insert DIE into the map.
Definition: DwarfUnit.cpp:200
Collects and handles dwarf debug information.
Definition: DwarfDebug.h:292
bool isVector() const
This file contains the declarations for metadata subclasses.
DwarfTypeUnit(DwarfCompileUnit &CU, AsmPrinter *A, DwarfDebug *DW, DwarfFile *DWU, MCDwarfDwoLineTable *SplitLineTable=nullptr)
Definition: DwarfUnit.cpp:86
Base class containing the logic for constructing DWARF expressions independently of whether they are ...
void addLoclistsBase()
Add the DW_AT_loclists_base attribute to the unit DIE.
Definition: DwarfUnit.cpp:1706
void emitDwarfSymbolReference(const MCSymbol *Label, bool ForceOffset=false) const
Emit a reference to a symbol for use in dwarf.
unsigned const TargetRegisterInfo * TRI
static bool hasVectorBeenPadded(const DICompositeType *CTy)
Returns true if the vector&#39;s size differs from the sum of sizes of elements the user specified...
Definition: DwarfUnit.cpp:1343
Metadata node.
Definition: Metadata.h:863
MachineFunction * MF
The current machine function.
Definition: AsmPrinter.h:96
StringRef getConfigurationMacros() const
bool useSegmentedStringOffsetsTable() const
Definition: DwarfUnit.h:252
uint16_t getDwarfVersion() const
Definition: MCContext.h:660
bool isForwardDecl() const
bool getDebugInfoForProfiling() const
bool isImm() const
isImm - Tests if this is a MO_Immediate operand.
void addType(DIE &Entity, const DIType *Ty, dwarf::Attribute Attribute=dwarf::DW_AT_type)
Add a new type attribute to the specified entity.
Definition: DwarfUnit.cpp:714
DIE::value_iterator addSectionLabel(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Label, const MCSymbol *Sec)
Add a Dwarf section label attribute data and value.
Definition: DwarfUnit.cpp:1656
StringRef getName() const
AsmPrinter * Asm
Target of Dwarf emission.
Definition: DwarfUnit.h:49
Tagged DWARF-like metadata node.
unsigned getBitWidth() const
Return the number of bits in the APInt.
Definition: APInt.h:1517
std::string fromHex(StringRef Input)
Convert hexadecimal string Input to its binary representation.
Definition: StringExtras.h:170
DINodeArray getElements() const
void constructTypeDIE(DIE &Buffer, const DICompositeType *CTy)
Definition: DwarfUnit.cpp:862
bool useSplitDwarf() const
Returns whether or not to change the current debug info for the split dwarf proposal support...
Definition: DwarfDebug.h:685
constexpr char Language[]
Key for Kernel::Metadata::mLanguage.
DIE * getDIE(const DINode *D) const
Returns the DIE map slot for the specified debug variable.
Definition: DwarfUnit.cpp:194
MCSymbol * getRnglistsTableBaseSym() const
Definition: DwarfFile.h:167
MCSymbol * getLoclistsTableBaseSym() const
Definition: DwarfFile.h:170
bool isLValueReference() const
bool isDebugDirectivesOnly() const
unsigned getTag() const
DIFile * getFile() const
const ConstantFP * getFPImm() const
Array subrange.
bool isShareableAcrossCUs(const DINode *D) const
Check whether the DIE for this MDNode can be shared across CUs.
Definition: DwarfUnit.cpp:179
void addConstantFPValue(DIE &Die, const MachineOperand &MO)
Add constant value entry in variable DIE.
Definition: DwarfUnit.cpp:499
void addGlobalTypeUnitType(const DIType *Ty, const DIScope *Context)
Add a new global type present in a type unit to this compile unit.
uint64_t getSizeInBits() const
void constructContainingTypeDIEs()
Construct DIEs for types that contain vtables.
Definition: DwarfUnit.cpp:1423
LLVM_NODISCARD bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:140
StringRef getFilename() const
This file implements a class to represent arbitrary precision integral constant values and operations...
DIE * getOrCreateTypeDIE(const MDNode *TyNode)
Find existing DIE or create new DIE for the given type.
Definition: DwarfUnit.cpp:669
void addBlock(DIE &Die, dwarf::Attribute Attribute, DIELoc *Loc)
Add block data.
Definition: DwarfUnit.cpp:391
DenseMap< DIE *, const DINode * > ContainingTypeMap
This map is used to keep track of subprogram DIEs that need DW_AT_containing_type attribute...
Definition: DwarfUnit.h:74
void addString(DIE &Die, dwarf::Attribute Attribute, StringRef Str)
Add a string attribute data and value.
Definition: DwarfUnit.cpp:247
bool getExportSymbols() const
AddressPool & getAddressPool()
Definition: DwarfDebug.h:722
Subprogram description.
int64_t getSExtValue() const
Get sign extended value.
Definition: APInt.h:1583
DIType * getBaseType() const
StringRef getIncludePath() const
EntryRef getIndexedEntry(AsmPrinter &Asm, StringRef Str)
Same as getEntry, except that you can use EntryRef::getIndex to obtain a unique ID of this entry (e...
unsigned getRuntimeLang() const
DenseMap< const MDNode *, DIE * > & getAbstractSPDies()
Definition: DwarfFile.h:186
MDString * getRawName() const
bool doesDwarfUseRelocationsAcrossSections() const
Definition: MCAsmInfo.h:604
A list of DIE values.
Definition: DIE.h:627
uint32_t getAlignInBytes() const
DwarfCompileUnit & getCU() override
Definition: DwarfUnit.h:374
const APInt & getValue() const
Return the constant as an APInt value reference.
Definition: Constants.h:137
bool isLittleEndian() const
Layout endianness...
Definition: DataLayout.h:233
MCSymbol * EndLabel
Emitted at the end of the CU and used to compute the CU Length field.
Definition: DwarfUnit.h:52
bool isFPImm() const
isFPImm - Tests if this is a MO_FPImmediate operand.
void addGlobalNameForTypeUnit(StringRef Name, const DIScope *Context)
Add a new global name present in a type unit to this compile unit.
DIE * getOrCreateNameSpace(const DINamespace *NS)
Definition: DwarfUnit.cpp:1067
DIE & addChild(DIE *Child)
Add a child to the DIE.
Definition: DIE.h:807
MCSection * getDwarfAbbrevSection() const
unsigned getLine() const
void addConstantValue(DIE &Die, const MachineOperand &MO, const DIType *Ty)
Add constant value entry in variable DIE.
Definition: DwarfUnit.cpp:531
DIE & getEntry() const
Definition: DIE.h:320
MCSymbol * getStringOffsetsStartSym() const
Definition: DwarfFile.h:164
DIScope * getScope() const
static DIE * get(BumpPtrAllocator &Alloc, dwarf::Tag Tag)
Definition: DIE.h:730
void applySubprogramAttributes(const DISubprogram *SP, DIE &SPDie, bool SkipSPAttributes=false)
Definition: DwarfUnit.cpp:1187
void addSourceLine(DIE &Die, unsigned Line, const DIFile *File)
Add location information to specified debug information entry.
Definition: DwarfUnit.cpp:405
void addGlobalName(StringRef Name, const DIE &Die, const DIScope *Context) override
Add a new global name to the compile unit.
Definition: DwarfUnit.cpp:1672
A pointer to another debug information entry.
Definition: DIE.h:313
DITemplateParameterArray getTemplateParams() const
This dwarf writer support class manages information associated with a source file.
Definition: DwarfUnit.h:40
DwarfStringPool & getStringPool()
Returns the string pool.
Definition: DwarfFile.h:162
DIEValueList::value_iterator addLabel(DIEValueList &Die, dwarf::Attribute Attribute, dwarf::Form Form, const MCSymbol *Label)
Add a Dwarf label attribute data and value.
Definition: DwarfUnit.cpp:281
bool applySubprogramDefinitionAttributes(const DISubprogram *SP, DIE &SPDie)
Definition: DwarfUnit.cpp:1144
const MCAsmInfo * MAI
Target Asm Printer information.
Definition: AsmPrinter.h:84
Instrumentation for Order File
CountType getCount() const
This file contains the declarations for the subclasses of Constant, which represent the different fla...
A container for inline string values.
Definition: DIE.h:291
A structured debug information entry.
Definition: DIE.h:700
DIELoc * getDIELoc()
Returns a fresh newly allocated DIELoc.
Definition: DwarfUnit.h:121
ConstantFP - Floating Point Values [float, double].
Definition: Constants.h:263
DIEUnit * getUnit() const
Climb up the parent chain to get the compile unit or type unit that this DIE belongs to...
Definition: DIE.cpp:214
DIE & getUnitDie()
Definition: DIE.h:879
static dwarf::Form BestForm(bool IsSigned, uint64_t Int)
Choose the best form for integer.
Definition: DIE.h:170
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:78
void addDwarfTypeUnitType(DwarfCompileUnit &CU, StringRef Identifier, DIE &Die, const DICompositeType *CTy)
Add a DIE to the set of types that we&#39;re going to pull into type units.
unsigned getOrCreateSourceID(const DIFile *File) override
Look up the source ID for the given file.
This file declares a class to represent arbitrary precision floating point values and provide a varie...
DenseMap< const MDNode *, DIE * > MDNodeToDieMap
Tracks the mapping of unit level debug information variables to debug information entries...
Definition: DwarfUnit.h:63
bool useDWARF2Bitfields() const
Returns whether to use the DWARF2 format for bitfields instyead of the DWARF4 format.
Definition: DwarfDebug.h:655
void emitCommonHeader(bool UseOffsets, dwarf::UnitType UT)
Emit the common part of the header for this unit.
Definition: DwarfUnit.cpp:1593
A label DIE.
Definition: DIE.h:218
DIE * getOrCreateSubprogramDIE(const DISubprogram *SP, bool Minimal=false)
Definition: DwarfUnit.cpp:1112
amdgpu Simplify well known AMD library false FunctionCallee Value * Arg
void addAccelType(const DICompileUnit &CU, StringRef Name, const DIE &Die, char Flags)
Base class for variables.
static uint64_t getBaseTypeSize(const DIType *Ty)
If this type is derived from a base type then return base type size.
bool isObjcClassComplete() const
bool isBigEndian() const
DIEDwarfExpression(const AsmPrinter &AP, DwarfCompileUnit &CU, DIELoc &DIE)
Definition: DwarfUnit.cpp:49
DIScope * getScope() const
StringRef getDirectory() const
bool useAllLinkageNames() const
Returns whether we should emit all DW_AT_[MIPS_]linkage_name.
Definition: DwarfDebug.h:647
TargetRegisterInfo base class - We assume that the target defines a static array of TargetRegisterDes...
A container for string pool string values.
Definition: DIE.h:272
bool isRValueReference() const
void addSInt(DIEValueList &Die, dwarf::Attribute Attribute, Optional< dwarf::Form > Form, int64_t Integer)
Add an signed integer attribute data and value.
Definition: DwarfUnit.cpp:235
DIE * IndexTyDie
An anonymous type for index type. Owned by DIEUnit.
Definition: DwarfUnit.h:59
Base class for scope-like contexts.
A simple label difference DIE.
Definition: DIE.h:255
std::string getParentContextString(const DIScope *Context) const
Get string containing language specific context for a global name.
Definition: DwarfUnit.cpp:720
UnitType
Constants for unit types in DWARF v5.
Definition: Dwarf.h:319
void insertDIE(const MDNode *TypeMD, DIE *Die)
Definition: DwarfFile.h:194
const APFloat & getValueAPF() const
Definition: Constants.h:302
bool isPublic() const
uint16_t getLanguage() const
Definition: DwarfUnit.h:88
unsigned getHeaderSize() const override
Compute the size of a header for this unit, not including the initial length field.
Definition: DwarfUnit.h:366
iterator_range< T > make_range(T x, T y)
Convenience function for iterating over sub-ranges.
bool isLittleEndian() const
bool useSectionsAsReferences() const
Returns whether to use sections as labels rather than temp symbols.
Definition: DwarfDebug.h:664
Base class for types.
This is the shared class of boolean and integer constants.
Definition: Constants.h:83
void addAccelNamespace(const DICompileUnit &CU, StringRef Name, const DIE &Die)
StringRef getName() const
MCSection * getSection() const
Return the section that this DIEUnit will be emitted into.
Definition: DIE.h:872
MCSymbol * getSymbol(const GlobalValue *GV) const
Definition: AsmPrinter.cpp:444
MachineOperand class - Representation of each machine instruction operand.
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:837
virtual Register getFrameRegister(const MachineFunction &MF) const =0
Debug information queries.
bool isType(Tag T)
Definition: Dwarf.h:90
const DataFlowGraph & G
Definition: RDFGraph.cpp:202
void addLinkageName(DIE &Die, StringRef LinkageName)
Add a linkage name, if it isn&#39;t empty.
Definition: DwarfUnit.cpp:582
DIScope * getScope() const
Represents a compile or type unit.
Definition: DIE.h:833
Optional< MD5::MD5Result > getMD5AsBytes(const DIFile *File) const
If the File has an MD5 checksum, return it as an MD5Result allocated in the MCContext.
Definition: DwarfUnit.cpp:300
MCSymbol * getBeginSymbol()
Definition: MCSection.h:110
void addGlobalType(const DIType *Ty, const DIE &Die, const DIScope *Context) override
Add a new global type to the compile unit.
Definition: DwarfUnit.cpp:1677
static GCRegistry::Add< StatepointGC > D("statepoint-example", "an example strategy for statepoint")
DIFile * getFile() const
LLVM_NODISCARD bool isa(const Y &Val)
Definition: Casting.h:141
bool isProtected() const
bool useAppleExtensionAttributes() const
Definition: DwarfDebug.h:679
void emitInt32(int Value) const
Emit a long directive and value.
int64_t getImm() const
void addRnglistsBase()
Add the DW_AT_rnglists_base attribute to the unit DIE.
Definition: DwarfUnit.cpp:1697
void addTemplateParams(DIE &Buffer, DINodeArray TParams)
Add template parameters in buffer.
Definition: DwarfUnit.cpp:590
DwarfDebug * DD
Definition: DwarfUnit.h:55
Class for arbitrary precision integers.
Definition: APInt.h:69
static StringRef dropLLVMManglingEscape(StringRef Name)
If the given string begins with the GlobalValue name mangling escape character &#39;\1&#39;, drop it.
Definition: GlobalValue.h:481
dwarf::Form BestForm(unsigned DwarfVersion) const
BestForm - Choose the best form for data.
Definition: DIE.h:903
DIType * getVTableHolder() const
A (clang) module that has been imported by the compile unit.
void addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIE &Entry)
Add a DIE attribute data and value.
Definition: DwarfUnit.cpp:355
dwarf::Tag getTag() const
Definition: DIE.h:736
const uint64_t * getRawData() const
This function returns a pointer to the internal storage of the APInt.
Definition: APInt.h:674
DIE * getOrCreateContextDIE(const DIScope *Context)
Get context owner&#39;s DIE.
Definition: DwarfUnit.cpp:608
Type array for a subprogram.
An integer value DIE.
Definition: DIE.h:163
bool isArtificial() const
unsigned getEncoding() const
EntryRef getEntry(AsmPrinter &Asm, StringRef Str)
Get a reference to an entry in the string pool.
dwarf::Form BestForm() const
BestForm - Choose the best form for data.
Definition: DIE.h:937
DIE & createAndAddDIE(unsigned Tag, DIE &Parent, const DINode *N=nullptr)
Create a DIE with the given Tag, add the DIE to its parent, and call insertDIE if MD is not null...
Definition: DwarfUnit.cpp:384
#define N
bool shareAcrossDWOCUs() const
Definition: DwarfDebug.cpp:483
DIE * getDIE(const MDNode *TypeMD)
Definition: DwarfFile.h:198
void emitHeader(bool UseOffsets) override
Emit the header for this unit, not including the initial length field.
Definition: DwarfUnit.cpp:1634
Optional< StringRef > getSource() const
DIE * getOrCreateModule(const DIModule *M)
Definition: DwarfUnit.cpp:1088
void EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo, unsigned Size) const
Emit something like ".long Hi-Lo" where the size in bytes of the directive is specified by Size and H...
uint32_t Size
Definition: Profile.cpp:46
const DICompileUnit * CUNode
MDNode for the compile unit.
Definition: DwarfUnit.h:43
virtual unsigned getISAEncoding()
Get the value for DW_AT_APPLE_isa. Zero if no isa encoding specified.
Definition: AsmPrinter.h:552
unsigned getFile(StringRef Directory, StringRef FileName, Optional< MD5::MD5Result > Checksum, uint16_t DwarfVersion, Optional< StringRef > Source)
Definition: MCDwarf.h:290
bool getExportSymbols() const
void addSectionOffset(DIE &Die, dwarf::Attribute Attribute, uint64_t Integer)
Add an offset into a section attribute data and value.
Definition: DwarfUnit.cpp:292
void addDIETypeSignature(DIE &Die, uint64_t Signature)
Add a type&#39;s DW_AT_signature and set the declaration flag.
Definition: DwarfUnit.cpp:359
unsigned getCodePointerSize() const
Get the code pointer size in bytes.
Definition: MCAsmInfo.h:400
BumpPtrAllocator DIEValueAllocator
Definition: DwarfUnit.h:46
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
std::array< uint8_t, 16 > Bytes
Definition: MD5.h:56
DIE * createTypeDIE(const DIScope *Context, DIE &ContextDIE, const DIType *Ty)
Creates type DIE with specific context.
Definition: DwarfUnit.cpp:638
void emitInt8(int Value) const
Emit a byte directive and value.
LLVM Value Representation.
Definition: Value.h:73
void addStringOffsetsStart()
Add the DW_AT_str_offsets_base attribute to the unit DIE.
Definition: DwarfUnit.cpp:1690
unsigned ComputeSize(const AsmPrinter *AP) const
ComputeSize - Calculate the size of the location expression.
Definition: DIE.cpp:701
DIScope * getScope() const
std::vector< DIEBlock * > DIEBlocks
A list of all the DIEBlocks in use.
Definition: DwarfUnit.h:66
uint16_t getDwarfVersion() const
Returns the Dwarf Version.
bool isAppleBlockExtension() const
DIDerivedType * getDiscriminator() const
void addUInt(DIEValueList &Die, dwarf::Attribute Attribute, Optional< dwarf::Form > Form, uint64_t Integer)
Add an unsigned integer attribute data and value.
Definition: DwarfUnit.cpp:221
const DataLayout & getDataLayout() const
Return information about data layout.
Definition: AsmPrinter.cpp:219
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
A single uniqued string.
Definition: Metadata.h:603
APInt bitcastToAPInt() const
Definition: APFloat.h:1109
unsigned getLine() const
unsigned getLine() const
unsigned ComputeSize(const AsmPrinter *AP) const
ComputeSize - Calculate the size of the location expression.
Definition: DIE.cpp:752
DIEBlock - Represents a block of values.
Definition: DIE.h:925
int64_t getSExtValue() const
Return the constant as a 64-bit integer value after it has been sign extended as appropriate for the ...
Definition: Constants.h:156
DIFile * getFile() const
DwarfFile * DU
Definition: DwarfUnit.h:56
OutputIt copy(R &&Range, OutputIt Out)
Definition: STLExtras.h:1217
void constructSubprogramArguments(DIE &Buffer, DITypeRefArray Args)
Construct function argument DIEs.
Definition: DwarfUnit.cpp:814
bool generateTypeUnits() const
Returns whether to generate DWARF v4 type units.
Definition: DwarfDebug.h:672
DwarfUnit(dwarf::Tag, const DICompileUnit *Node, AsmPrinter *A, DwarfDebug *DW, DwarfFile *DWU)
Definition: DwarfUnit.cpp:80
Root of the metadata hierarchy.
Definition: Metadata.h:57
MCSymbol * createTempSymbol(const Twine &Name) const
unsigned getLine() const
StringRef getISysRoot() const
constexpr char Args[]
Key for Kernel::Metadata::mArgs.
value_iterator addValue(BumpPtrAllocator &Alloc, const DIEValue &V)
Definition: DIE.h:678
bool isTypePassByReference() const
void emitInt16(int Value) const
Emit a short directive and value.
bool useInlineStrings() const
Returns whether to use inline strings.
Definition: DwarfDebug.h:658
Basic type, like &#39;int&#39; or &#39;float&#39;.
unsigned getIndex(const MCSymbol *Sym, bool TLS=false)
Returns the index into the address pool with the given label/symbol.
Definition: AddressPool.cpp:19