LLVM  10.0.0svn
DwarfCompileUnit.cpp
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1 //===- llvm/CodeGen/DwarfCompileUnit.cpp - Dwarf 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 "DwarfCompileUnit.h"
14 #include "AddressPool.h"
15 #include "DwarfDebug.h"
16 #include "DwarfExpression.h"
17 #include "DwarfUnit.h"
18 #include "llvm/ADT/None.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/SmallString.h"
21 #include "llvm/ADT/SmallVector.h"
22 #include "llvm/ADT/StringRef.h"
25 #include "llvm/CodeGen/DIE.h"
33 #include "llvm/IR/DataLayout.h"
34 #include "llvm/IR/DebugInfo.h"
36 #include "llvm/IR/GlobalVariable.h"
37 #include "llvm/MC/MCSection.h"
38 #include "llvm/MC/MCStreamer.h"
39 #include "llvm/MC/MCSymbol.h"
41 #include "llvm/Support/Casting.h"
45 #include <algorithm>
46 #include <cassert>
47 #include <cstdint>
48 #include <iterator>
49 #include <memory>
50 #include <string>
51 #include <utility>
52 
53 using namespace llvm;
54 
56  AsmPrinter *A, DwarfDebug *DW,
57  DwarfFile *DWU)
58  : DwarfUnit(dwarf::DW_TAG_compile_unit, Node, A, DW, DWU), UniqueID(UID) {
59  insertDIE(Node, &getUnitDie());
60  MacroLabelBegin = Asm->createTempSymbol("cu_macro_begin");
61 }
62 
63 /// addLabelAddress - Add a dwarf label attribute data and value using
64 /// DW_FORM_addr or DW_FORM_GNU_addr_index.
66  const MCSymbol *Label) {
67  // Don't use the address pool in non-fission or in the skeleton unit itself.
68  // FIXME: Once GDB supports this, it's probably worthwhile using the address
69  // pool from the skeleton - maybe even in non-fission (possibly fewer
70  // relocations by sharing them in the pool, but we have other ideas about how
71  // to reduce the number of relocations as well/instead).
72  if ((!DD->useSplitDwarf() || !Skeleton) && DD->getDwarfVersion() < 5)
73  return addLocalLabelAddress(Die, Attribute, Label);
74 
75  if (Label)
76  DD->addArangeLabel(SymbolCU(this, Label));
77 
78  unsigned idx = DD->getAddressPool().getIndex(Label);
79  Die.addValue(DIEValueAllocator, Attribute,
80  DD->getDwarfVersion() >= 5 ? dwarf::DW_FORM_addrx
81  : dwarf::DW_FORM_GNU_addr_index,
82  DIEInteger(idx));
83 }
84 
87  const MCSymbol *Label) {
88  if (Label)
89  DD->addArangeLabel(SymbolCU(this, Label));
90 
91  if (Label)
92  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_addr,
93  DIELabel(Label));
94  else
95  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_addr,
96  DIEInteger(0));
97 }
98 
100  // If we print assembly, we can't separate .file entries according to
101  // compile units. Thus all files will belong to the default compile unit.
102 
103  // FIXME: add a better feature test than hasRawTextSupport. Even better,
104  // extend .file to support this.
105  unsigned CUID = Asm->OutStreamer->hasRawTextSupport() ? 0 : getUniqueID();
106  if (!File)
107  return Asm->OutStreamer->EmitDwarfFileDirective(0, "", "", None, None, CUID);
108  return Asm->OutStreamer->EmitDwarfFileDirective(
109  0, File->getDirectory(), File->getFilename(), getMD5AsBytes(File),
110  File->getSource(), CUID);
111 }
112 
114  const DIGlobalVariable *GV, ArrayRef<GlobalExpr> GlobalExprs) {
115  // Check for pre-existence.
116  if (DIE *Die = getDIE(GV))
117  return Die;
118 
119  assert(GV);
120 
121  auto *GVContext = GV->getScope();
122  const DIType *GTy = GV->getType();
123 
124  // Construct the context before querying for the existence of the DIE in
125  // case such construction creates the DIE.
126  auto *CB = GVContext ? dyn_cast<DICommonBlock>(GVContext) : nullptr;
127  DIE *ContextDIE = CB ? getOrCreateCommonBlock(CB, GlobalExprs)
128  : getOrCreateContextDIE(GVContext);
129 
130  // Add to map.
131  DIE *VariableDIE = &createAndAddDIE(GV->getTag(), *ContextDIE, GV);
132  DIScope *DeclContext;
133  if (auto *SDMDecl = GV->getStaticDataMemberDeclaration()) {
134  DeclContext = SDMDecl->getScope();
135  assert(SDMDecl->isStaticMember() && "Expected static member decl");
136  assert(GV->isDefinition());
137  // We need the declaration DIE that is in the static member's class.
138  DIE *VariableSpecDIE = getOrCreateStaticMemberDIE(SDMDecl);
139  addDIEEntry(*VariableDIE, dwarf::DW_AT_specification, *VariableSpecDIE);
140  // If the global variable's type is different from the one in the class
141  // member type, assume that it's more specific and also emit it.
142  if (GTy != SDMDecl->getBaseType())
143  addType(*VariableDIE, GTy);
144  } else {
145  DeclContext = GV->getScope();
146  // Add name and type.
147  addString(*VariableDIE, dwarf::DW_AT_name, GV->getDisplayName());
148  addType(*VariableDIE, GTy);
149 
150  // Add scoping info.
151  if (!GV->isLocalToUnit())
152  addFlag(*VariableDIE, dwarf::DW_AT_external);
153 
154  // Add line number info.
155  addSourceLine(*VariableDIE, GV);
156  }
157 
158  if (!GV->isDefinition())
159  addFlag(*VariableDIE, dwarf::DW_AT_declaration);
160  else
161  addGlobalName(GV->getName(), *VariableDIE, DeclContext);
162 
163  if (uint32_t AlignInBytes = GV->getAlignInBytes())
164  addUInt(*VariableDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
165  AlignInBytes);
166 
167  if (MDTuple *TP = GV->getTemplateParams())
168  addTemplateParams(*VariableDIE, DINodeArray(TP));
169 
170  // Add location.
171  addLocationAttribute(VariableDIE, GV, GlobalExprs);
172 
173  return VariableDIE;
174 }
175 
177  DIE *VariableDIE, const DIGlobalVariable *GV, ArrayRef<GlobalExpr> GlobalExprs) {
178  bool addToAccelTable = false;
179  DIELoc *Loc = nullptr;
180  Optional<unsigned> NVPTXAddressSpace;
181  std::unique_ptr<DIEDwarfExpression> DwarfExpr;
182  for (const auto &GE : GlobalExprs) {
183  const GlobalVariable *Global = GE.Var;
184  const DIExpression *Expr = GE.Expr;
185 
186  // For compatibility with DWARF 3 and earlier,
187  // DW_AT_location(DW_OP_constu, X, DW_OP_stack_value) becomes
188  // DW_AT_const_value(X).
189  if (GlobalExprs.size() == 1 && Expr && Expr->isConstant()) {
190  addToAccelTable = true;
191  addConstantValue(*VariableDIE, /*Unsigned=*/true, Expr->getElement(1));
192  break;
193  }
194 
195  // We cannot describe the location of dllimport'd variables: the
196  // computation of their address requires loads from the IAT.
197  if (Global && Global->hasDLLImportStorageClass())
198  continue;
199 
200  // Nothing to describe without address or constant.
201  if (!Global && (!Expr || !Expr->isConstant()))
202  continue;
203 
204  if (Global && Global->isThreadLocal() &&
206  continue;
207 
208  if (!Loc) {
209  addToAccelTable = true;
210  Loc = new (DIEValueAllocator) DIELoc;
211  DwarfExpr = std::make_unique<DIEDwarfExpression>(*Asm, *this, *Loc);
212  }
213 
214  if (Expr) {
215  // According to
216  // https://docs.nvidia.com/cuda/archive/10.0/ptx-writers-guide-to-interoperability/index.html#cuda-specific-dwarf
217  // cuda-gdb requires DW_AT_address_class for all variables to be able to
218  // correctly interpret address space of the variable address.
219  // Decode DW_OP_constu <DWARF Address Space> DW_OP_swap DW_OP_xderef
220  // sequence for the NVPTX + gdb target.
221  unsigned LocalNVPTXAddressSpace;
222  if (Asm->TM.getTargetTriple().isNVPTX() && DD->tuneForGDB()) {
223  const DIExpression *NewExpr =
224  DIExpression::extractAddressClass(Expr, LocalNVPTXAddressSpace);
225  if (NewExpr != Expr) {
226  Expr = NewExpr;
227  NVPTXAddressSpace = LocalNVPTXAddressSpace;
228  }
229  }
230  DwarfExpr->addFragmentOffset(Expr);
231  }
232 
233  if (Global) {
234  const MCSymbol *Sym = Asm->getSymbol(Global);
235  if (Global->isThreadLocal()) {
236  if (Asm->TM.useEmulatedTLS()) {
237  // TODO: add debug info for emulated thread local mode.
238  } else {
239  // FIXME: Make this work with -gsplit-dwarf.
240  unsigned PointerSize = Asm->getDataLayout().getPointerSize();
241  assert((PointerSize == 4 || PointerSize == 8) &&
242  "Add support for other sizes if necessary");
243  // Based on GCC's support for TLS:
244  if (!DD->useSplitDwarf()) {
245  // 1) Start with a constNu of the appropriate pointer size
246  addUInt(*Loc, dwarf::DW_FORM_data1,
247  PointerSize == 4 ? dwarf::DW_OP_const4u
248  : dwarf::DW_OP_const8u);
249  // 2) containing the (relocated) offset of the TLS variable
250  // within the module's TLS block.
251  addExpr(*Loc, dwarf::DW_FORM_udata,
253  } else {
254  addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
255  addUInt(*Loc, dwarf::DW_FORM_udata,
256  DD->getAddressPool().getIndex(Sym, /* TLS */ true));
257  }
258  // 3) followed by an OP to make the debugger do a TLS lookup.
259  addUInt(*Loc, dwarf::DW_FORM_data1,
260  DD->useGNUTLSOpcode() ? dwarf::DW_OP_GNU_push_tls_address
261  : dwarf::DW_OP_form_tls_address);
262  }
263  } else {
264  DD->addArangeLabel(SymbolCU(this, Sym));
265  addOpAddress(*Loc, Sym);
266  }
267  }
268  // Global variables attached to symbols are memory locations.
269  // It would be better if this were unconditional, but malformed input that
270  // mixes non-fragments and fragments for the same variable is too expensive
271  // to detect in the verifier.
272  if (DwarfExpr->isUnknownLocation())
273  DwarfExpr->setMemoryLocationKind();
274  DwarfExpr->addExpression(Expr);
275  }
276  if (Asm->TM.getTargetTriple().isNVPTX() && DD->tuneForGDB()) {
277  // According to
278  // https://docs.nvidia.com/cuda/archive/10.0/ptx-writers-guide-to-interoperability/index.html#cuda-specific-dwarf
279  // cuda-gdb requires DW_AT_address_class for all variables to be able to
280  // correctly interpret address space of the variable address.
281  const unsigned NVPTX_ADDR_global_space = 5;
282  addUInt(*VariableDIE, dwarf::DW_AT_address_class, dwarf::DW_FORM_data1,
283  NVPTXAddressSpace ? *NVPTXAddressSpace : NVPTX_ADDR_global_space);
284  }
285  if (Loc)
286  addBlock(*VariableDIE, dwarf::DW_AT_location, DwarfExpr->finalize());
287 
288  if (DD->useAllLinkageNames())
289  addLinkageName(*VariableDIE, GV->getLinkageName());
290 
291  if (addToAccelTable) {
292  DD->addAccelName(*CUNode, GV->getName(), *VariableDIE);
293 
294  // If the linkage name is different than the name, go ahead and output
295  // that as well into the name table.
296  if (GV->getLinkageName() != "" && GV->getName() != GV->getLinkageName() &&
298  DD->addAccelName(*CUNode, GV->getLinkageName(), *VariableDIE);
299  }
300 }
301 
303  const DICommonBlock *CB, ArrayRef<GlobalExpr> GlobalExprs) {
304  // Construct the context before querying for the existence of the DIE in case
305  // such construction creates the DIE.
306  DIE *ContextDIE = getOrCreateContextDIE(CB->getScope());
307 
308  if (DIE *NDie = getDIE(CB))
309  return NDie;
310  DIE &NDie = createAndAddDIE(dwarf::DW_TAG_common_block, *ContextDIE, CB);
311  StringRef Name = CB->getName().empty() ? "_BLNK_" : CB->getName();
312  addString(NDie, dwarf::DW_AT_name, Name);
313  addGlobalName(Name, NDie, CB->getScope());
314  if (CB->getFile())
315  addSourceLine(NDie, CB->getLineNo(), CB->getFile());
316  if (DIGlobalVariable *V = CB->getDecl())
317  getCU().addLocationAttribute(&NDie, V, GlobalExprs);
318  return &NDie;
319 }
320 
322  bool SameAsPrevCU = this == DD->getPrevCU();
323  DD->setPrevCU(this);
324  // If we have no current ranges just add the range and return, otherwise,
325  // check the current section and CU against the previous section and CU we
326  // emitted into and the subprogram was contained within. If these are the
327  // same then extend our current range, otherwise add this as a new range.
328  if (CURanges.empty() || !SameAsPrevCU ||
329  (&CURanges.back().End->getSection() !=
330  &Range.End->getSection())) {
331  CURanges.push_back(Range);
332  return;
333  }
334 
335  CURanges.back().End = Range.End;
336 }
337 
340  return;
341 
342  // Define start line table label for each Compile Unit.
343  MCSymbol *LineTableStartSym;
345  if (DD->useSectionsAsReferences()) {
346  LineTableStartSym = TLOF.getDwarfLineSection()->getBeginSymbol();
347  } else {
348  LineTableStartSym =
349  Asm->OutStreamer->getDwarfLineTableSymbol(getUniqueID());
350  }
351 
352  // DW_AT_stmt_list is a offset of line number information for this
353  // compile unit in debug_line section. For split dwarf this is
354  // left in the skeleton CU and so not included.
355  // The line table entries are not always emitted in assembly, so it
356  // is not okay to use line_table_start here.
357  StmtListValue =
358  addSectionLabel(getUnitDie(), dwarf::DW_AT_stmt_list, LineTableStartSym,
360 }
361 
363  D.addValue(DIEValueAllocator, *StmtListValue);
364 }
365 
367  const MCSymbol *End) {
368  assert(Begin && "Begin label should not be null!");
369  assert(End && "End label should not be null!");
370  assert(Begin->isDefined() && "Invalid starting label");
371  assert(End->isDefined() && "Invalid end label");
372 
373  addLabelAddress(D, dwarf::DW_AT_low_pc, Begin);
374  if (DD->getDwarfVersion() < 4)
375  addLabelAddress(D, dwarf::DW_AT_high_pc, End);
376  else
377  addLabelDelta(D, dwarf::DW_AT_high_pc, End, Begin);
378 }
379 
380 // Find DIE for the given subprogram and attach appropriate DW_AT_low_pc
381 // and DW_AT_high_pc attributes. If there are global variables in this
382 // scope then create and insert DIEs for these variables.
385 
389  *DD->getCurrentFunction()))
390  addFlag(*SPDie, dwarf::DW_AT_APPLE_omit_frame_ptr);
391 
392  // Only include DW_AT_frame_base in full debug info
394  if (Asm->MF->getTarget().getTargetTriple().isNVPTX()) {
395  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
396  addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_call_frame_cfa);
397  addBlock(*SPDie, dwarf::DW_AT_frame_base, Loc);
398  } else {
400  MachineLocation Location(RI->getFrameRegister(*Asm->MF));
401  if (Register::isPhysicalRegister(Location.getReg()))
402  addAddress(*SPDie, dwarf::DW_AT_frame_base, Location);
403  }
404  }
405 
406  // Add name to the name table, we do this here because we're guaranteed
407  // to have concrete versions of our DW_TAG_subprogram nodes.
408  DD->addSubprogramNames(*CUNode, SP, *SPDie);
409 
410  return *SPDie;
411 }
412 
413 // Construct a DIE for this scope.
415  LexicalScope *Scope, SmallVectorImpl<DIE *> &FinalChildren) {
416  if (!Scope || !Scope->getScopeNode())
417  return;
418 
419  auto *DS = Scope->getScopeNode();
420 
421  assert((Scope->getInlinedAt() || !isa<DISubprogram>(DS)) &&
422  "Only handle inlined subprograms here, use "
423  "constructSubprogramScopeDIE for non-inlined "
424  "subprograms");
425 
426  SmallVector<DIE *, 8> Children;
427 
428  // We try to create the scope DIE first, then the children DIEs. This will
429  // avoid creating un-used children then removing them later when we find out
430  // the scope DIE is null.
431  DIE *ScopeDIE;
432  if (Scope->getParent() && isa<DISubprogram>(DS)) {
433  ScopeDIE = constructInlinedScopeDIE(Scope);
434  if (!ScopeDIE)
435  return;
436  // We create children when the scope DIE is not null.
437  createScopeChildrenDIE(Scope, Children);
438  } else {
439  // Early exit when we know the scope DIE is going to be null.
440  if (DD->isLexicalScopeDIENull(Scope))
441  return;
442 
443  bool HasNonScopeChildren = false;
444 
445  // We create children here when we know the scope DIE is not going to be
446  // null and the children will be added to the scope DIE.
447  createScopeChildrenDIE(Scope, Children, &HasNonScopeChildren);
448 
449  // If there are only other scopes as children, put them directly in the
450  // parent instead, as this scope would serve no purpose.
451  if (!HasNonScopeChildren) {
452  FinalChildren.insert(FinalChildren.end(),
453  std::make_move_iterator(Children.begin()),
454  std::make_move_iterator(Children.end()));
455  return;
456  }
457  ScopeDIE = constructLexicalScopeDIE(Scope);
458  assert(ScopeDIE && "Scope DIE should not be null.");
459  }
460 
461  // Add children
462  for (auto &I : Children)
463  ScopeDIE->addChild(std::move(I));
464 
465  FinalChildren.push_back(std::move(ScopeDIE));
466 }
467 
470 
471  HasRangeLists = true;
472 
473  // Add the range list to the set of ranges to be emitted.
474  auto IndexAndList =
475  (DD->getDwarfVersion() < 5 && Skeleton ? Skeleton->DU : DU)
476  ->addRange(*(Skeleton ? Skeleton : this), std::move(Range));
477 
478  uint32_t Index = IndexAndList.first;
479  auto &List = *IndexAndList.second;
480 
481  // Under fission, ranges are specified by constant offsets relative to the
482  // CU's DW_AT_GNU_ranges_base.
483  // FIXME: For DWARF v5, do not generate the DW_AT_ranges attribute under
484  // fission until we support the forms using the .debug_addr section
485  // (DW_RLE_startx_endx etc.).
486  if (DD->getDwarfVersion() >= 5)
487  addUInt(ScopeDIE, dwarf::DW_AT_ranges, dwarf::DW_FORM_rnglistx, Index);
488  else {
490  const MCSymbol *RangeSectionSym =
492  if (isDwoUnit())
493  addSectionDelta(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
494  RangeSectionSym);
495  else
496  addSectionLabel(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
497  RangeSectionSym);
498  }
499 }
500 
502  DIE &Die, SmallVector<RangeSpan, 2> Ranges) {
503  if (Ranges.size() == 1 || !DD->useRangesSection()) {
504  const RangeSpan &Front = Ranges.front();
505  const RangeSpan &Back = Ranges.back();
506  attachLowHighPC(Die, Front.Begin, Back.End);
507  } else
508  addScopeRangeList(Die, std::move(Ranges));
509 }
510 
512  DIE &Die, const SmallVectorImpl<InsnRange> &Ranges) {
514  List.reserve(Ranges.size());
515  for (const InsnRange &R : Ranges)
516  List.push_back(
517  {DD->getLabelBeforeInsn(R.first), DD->getLabelAfterInsn(R.second)});
518  attachRangesOrLowHighPC(Die, std::move(List));
519 }
520 
521 // This scope represents inlined body of a function. Construct DIE to
522 // represent this concrete inlined copy of the function.
524  assert(Scope->getScopeNode());
525  auto *DS = Scope->getScopeNode();
526  auto *InlinedSP = getDISubprogram(DS);
527  // Find the subprogram's DwarfCompileUnit in the SPMap in case the subprogram
528  // was inlined from another compile unit.
529  DIE *OriginDIE = getAbstractSPDies()[InlinedSP];
530  assert(OriginDIE && "Unable to find original DIE for an inlined subprogram.");
531 
532  auto ScopeDIE = DIE::get(DIEValueAllocator, dwarf::DW_TAG_inlined_subroutine);
533  addDIEEntry(*ScopeDIE, dwarf::DW_AT_abstract_origin, *OriginDIE);
534 
535  attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
536 
537  // Add the call site information to the DIE.
538  const DILocation *IA = Scope->getInlinedAt();
539  addUInt(*ScopeDIE, dwarf::DW_AT_call_file, None,
540  getOrCreateSourceID(IA->getFile()));
541  addUInt(*ScopeDIE, dwarf::DW_AT_call_line, None, IA->getLine());
542  if (IA->getColumn())
543  addUInt(*ScopeDIE, dwarf::DW_AT_call_column, None, IA->getColumn());
544  if (IA->getDiscriminator() && DD->getDwarfVersion() >= 4)
545  addUInt(*ScopeDIE, dwarf::DW_AT_GNU_discriminator, None,
546  IA->getDiscriminator());
547 
548  // Add name to the name table, we do this here because we're guaranteed
549  // to have concrete versions of our DW_TAG_inlined_subprogram nodes.
550  DD->addSubprogramNames(*CUNode, InlinedSP, *ScopeDIE);
551 
552  return ScopeDIE;
553 }
554 
555 // Construct new DW_TAG_lexical_block for this scope and attach
556 // DW_AT_low_pc/DW_AT_high_pc labels.
558  if (DD->isLexicalScopeDIENull(Scope))
559  return nullptr;
560 
561  auto ScopeDIE = DIE::get(DIEValueAllocator, dwarf::DW_TAG_lexical_block);
562  if (Scope->isAbstractScope())
563  return ScopeDIE;
564 
565  attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
566 
567  return ScopeDIE;
568 }
569 
570 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
572  auto D = constructVariableDIEImpl(DV, Abstract);
573  DV.setDIE(*D);
574  return D;
575 }
576 
578  const LexicalScope &Scope) {
579  auto LabelDie = DIE::get(DIEValueAllocator, DL.getTag());
580  insertDIE(DL.getLabel(), LabelDie);
581  DL.setDIE(*LabelDie);
582 
583  if (Scope.isAbstractScope())
584  applyLabelAttributes(DL, *LabelDie);
585 
586  return LabelDie;
587 }
588 
589 DIE *DwarfCompileUnit::constructVariableDIEImpl(const DbgVariable &DV,
590  bool Abstract) {
591  // Define variable debug information entry.
592  auto VariableDie = DIE::get(DIEValueAllocator, DV.getTag());
593  insertDIE(DV.getVariable(), VariableDie);
594 
595  if (Abstract) {
596  applyVariableAttributes(DV, *VariableDie);
597  return VariableDie;
598  }
599 
600  // Add variable address.
601 
602  unsigned Offset = DV.getDebugLocListIndex();
603  if (Offset != ~0U) {
604  addLocationList(*VariableDie, dwarf::DW_AT_location, Offset);
605  return VariableDie;
606  }
607 
608  // Check if variable has a single location description.
609  if (auto *DVal = DV.getValueLoc()) {
610  if (DVal->isLocation())
611  addVariableAddress(DV, *VariableDie, DVal->getLoc());
612  else if (DVal->isInt()) {
613  auto *Expr = DV.getSingleExpression();
614  if (Expr && Expr->getNumElements()) {
615  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
616  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
617  // If there is an expression, emit raw unsigned bytes.
618  DwarfExpr.addFragmentOffset(Expr);
619  DwarfExpr.addUnsignedConstant(DVal->getInt());
620  DwarfExpr.addExpression(Expr);
621  addBlock(*VariableDie, dwarf::DW_AT_location, DwarfExpr.finalize());
622  } else
623  addConstantValue(*VariableDie, DVal->getInt(), DV.getType());
624  } else if (DVal->isConstantFP()) {
625  addConstantFPValue(*VariableDie, DVal->getConstantFP());
626  } else if (DVal->isConstantInt()) {
627  addConstantValue(*VariableDie, DVal->getConstantInt(), DV.getType());
628  }
629  return VariableDie;
630  }
631 
632  // .. else use frame index.
633  if (!DV.hasFrameIndexExprs())
634  return VariableDie;
635 
636  Optional<unsigned> NVPTXAddressSpace;
637  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
638  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
639  for (auto &Fragment : DV.getFrameIndexExprs()) {
640  unsigned FrameReg = 0;
641  const DIExpression *Expr = Fragment.Expr;
643  int Offset = TFI->getFrameIndexReference(*Asm->MF, Fragment.FI, FrameReg);
644  DwarfExpr.addFragmentOffset(Expr);
646  DIExpression::appendOffset(Ops, Offset);
647  // According to
648  // https://docs.nvidia.com/cuda/archive/10.0/ptx-writers-guide-to-interoperability/index.html#cuda-specific-dwarf
649  // cuda-gdb requires DW_AT_address_class for all variables to be able to
650  // correctly interpret address space of the variable address.
651  // Decode DW_OP_constu <DWARF Address Space> DW_OP_swap DW_OP_xderef
652  // sequence for the NVPTX + gdb target.
653  unsigned LocalNVPTXAddressSpace;
654  if (Asm->TM.getTargetTriple().isNVPTX() && DD->tuneForGDB()) {
655  const DIExpression *NewExpr =
656  DIExpression::extractAddressClass(Expr, LocalNVPTXAddressSpace);
657  if (NewExpr != Expr) {
658  Expr = NewExpr;
659  NVPTXAddressSpace = LocalNVPTXAddressSpace;
660  }
661  }
662  if (Expr)
663  Ops.append(Expr->elements_begin(), Expr->elements_end());
664  DIExpressionCursor Cursor(Ops);
665  DwarfExpr.setMemoryLocationKind();
666  if (const MCSymbol *FrameSymbol = Asm->getFunctionFrameSymbol())
667  addOpAddress(*Loc, FrameSymbol);
668  else
669  DwarfExpr.addMachineRegExpression(
670  *Asm->MF->getSubtarget().getRegisterInfo(), Cursor, FrameReg);
671  DwarfExpr.addExpression(std::move(Cursor));
672  }
673  if (Asm->TM.getTargetTriple().isNVPTX() && DD->tuneForGDB()) {
674  // According to
675  // https://docs.nvidia.com/cuda/archive/10.0/ptx-writers-guide-to-interoperability/index.html#cuda-specific-dwarf
676  // cuda-gdb requires DW_AT_address_class for all variables to be able to
677  // correctly interpret address space of the variable address.
678  const unsigned NVPTX_ADDR_local_space = 6;
679  addUInt(*VariableDie, dwarf::DW_AT_address_class, dwarf::DW_FORM_data1,
680  NVPTXAddressSpace ? *NVPTXAddressSpace : NVPTX_ADDR_local_space);
681  }
682  addBlock(*VariableDie, dwarf::DW_AT_location, DwarfExpr.finalize());
683  if (DwarfExpr.TagOffset)
684  addUInt(*VariableDie, dwarf::DW_AT_LLVM_tag_offset, dwarf::DW_FORM_data1,
685  *DwarfExpr.TagOffset);
686 
687  return VariableDie;
688 }
689 
691  const LexicalScope &Scope,
692  DIE *&ObjectPointer) {
693  auto Var = constructVariableDIE(DV, Scope.isAbstractScope());
694  if (DV.isObjectPointer())
695  ObjectPointer = Var;
696  return Var;
697 }
698 
699 /// Return all DIVariables that appear in count: expressions.
702  auto *Array = dyn_cast<DICompositeType>(Var->getType());
703  if (!Array || Array->getTag() != dwarf::DW_TAG_array_type)
704  return Result;
705  for (auto *El : Array->getElements()) {
706  if (auto *Subrange = dyn_cast<DISubrange>(El)) {
707  auto Count = Subrange->getCount();
708  if (auto *Dependency = Count.dyn_cast<DIVariable *>())
709  Result.push_back(Dependency);
710  }
711  }
712  return Result;
713 }
714 
715 /// Sort local variables so that variables appearing inside of helper
716 /// expressions come first.
721  // Map back from a DIVariable to its containing DbgVariable.
723  // Set of DbgVariables in Result.
725  // For cycle detection.
727 
728  // Initialize the worklist and the DIVariable lookup table.
729  for (auto Var : reverse(Input)) {
730  DbgVar.insert({Var->getVariable(), Var});
731  WorkList.push_back({Var, 0});
732  }
733 
734  // Perform a stable topological sort by doing a DFS.
735  while (!WorkList.empty()) {
736  auto Item = WorkList.back();
737  DbgVariable *Var = Item.getPointer();
738  bool visitedAllDependencies = Item.getInt();
739  WorkList.pop_back();
740 
741  // Dependency is in a different lexical scope or a global.
742  if (!Var)
743  continue;
744 
745  // Already handled.
746  if (Visited.count(Var))
747  continue;
748 
749  // Add to Result if all dependencies are visited.
750  if (visitedAllDependencies) {
751  Visited.insert(Var);
752  Result.push_back(Var);
753  continue;
754  }
755 
756  // Detect cycles.
757  auto Res = Visiting.insert(Var);
758  if (!Res.second) {
759  assert(false && "dependency cycle in local variables");
760  return Result;
761  }
762 
763  // Push dependencies and this node onto the worklist, so that this node is
764  // visited again after all of its dependencies are handled.
765  WorkList.push_back({Var, 1});
766  for (auto *Dependency : dependencies(Var)) {
767  auto Dep = dyn_cast_or_null<const DILocalVariable>(Dependency);
768  WorkList.push_back({DbgVar[Dep], 0});
769  }
770  }
771  return Result;
772 }
773 
775  SmallVectorImpl<DIE *> &Children,
776  bool *HasNonScopeChildren) {
777  assert(Children.empty());
778  DIE *ObjectPointer = nullptr;
779 
780  // Emit function arguments (order is significant).
781  auto Vars = DU->getScopeVariables().lookup(Scope);
782  for (auto &DV : Vars.Args)
783  Children.push_back(constructVariableDIE(*DV.second, *Scope, ObjectPointer));
784 
785  // Emit local variables.
786  auto Locals = sortLocalVars(Vars.Locals);
787  for (DbgVariable *DV : Locals)
788  Children.push_back(constructVariableDIE(*DV, *Scope, ObjectPointer));
789 
790  // Skip imported directives in gmlt-like data.
792  // There is no need to emit empty lexical block DIE.
793  for (const auto *IE : ImportedEntities[Scope->getScopeNode()])
794  Children.push_back(
795  constructImportedEntityDIE(cast<DIImportedEntity>(IE)));
796  }
797 
798  if (HasNonScopeChildren)
799  *HasNonScopeChildren = !Children.empty();
800 
801  for (DbgLabel *DL : DU->getScopeLabels().lookup(Scope))
802  Children.push_back(constructLabelDIE(*DL, *Scope));
803 
804  for (LexicalScope *LS : Scope->getChildren())
805  constructScopeDIE(LS, Children);
806 
807  return ObjectPointer;
808 }
809 
811  LexicalScope *Scope) {
812  DIE &ScopeDIE = updateSubprogramScopeDIE(Sub);
813 
814  if (Scope) {
815  assert(!Scope->getInlinedAt());
816  assert(!Scope->isAbstractScope());
817  // Collect lexical scope children first.
818  // ObjectPointer might be a local (non-argument) local variable if it's a
819  // block's synthetic this pointer.
820  if (DIE *ObjectPointer = createAndAddScopeChildren(Scope, ScopeDIE))
821  addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, *ObjectPointer);
822  }
823 
824  // If this is a variadic function, add an unspecified parameter.
825  DITypeRefArray FnArgs = Sub->getType()->getTypeArray();
826 
827  // If we have a single element of null, it is a function that returns void.
828  // If we have more than one elements and the last one is null, it is a
829  // variadic function.
830  if (FnArgs.size() > 1 && !FnArgs[FnArgs.size() - 1] &&
832  ScopeDIE.addChild(
833  DIE::get(DIEValueAllocator, dwarf::DW_TAG_unspecified_parameters));
834 
835  return ScopeDIE;
836 }
837 
839  DIE &ScopeDIE) {
840  // We create children when the scope DIE is not null.
841  SmallVector<DIE *, 8> Children;
842  DIE *ObjectPointer = createScopeChildrenDIE(Scope, Children);
843 
844  // Add children
845  for (auto &I : Children)
846  ScopeDIE.addChild(std::move(I));
847 
848  return ObjectPointer;
849 }
850 
852  LexicalScope *Scope) {
853  DIE *&AbsDef = getAbstractSPDies()[Scope->getScopeNode()];
854  if (AbsDef)
855  return;
856 
857  auto *SP = cast<DISubprogram>(Scope->getScopeNode());
858 
859  DIE *ContextDIE;
860  DwarfCompileUnit *ContextCU = this;
861 
863  ContextDIE = &getUnitDie();
864  // Some of this is duplicated from DwarfUnit::getOrCreateSubprogramDIE, with
865  // the important distinction that the debug node is not associated with the
866  // DIE (since the debug node will be associated with the concrete DIE, if
867  // any). It could be refactored to some common utility function.
868  else if (auto *SPDecl = SP->getDeclaration()) {
869  ContextDIE = &getUnitDie();
870  getOrCreateSubprogramDIE(SPDecl);
871  } else {
872  ContextDIE = getOrCreateContextDIE(SP->getScope());
873  // The scope may be shared with a subprogram that has already been
874  // constructed in another CU, in which case we need to construct this
875  // subprogram in the same CU.
876  ContextCU = DD->lookupCU(ContextDIE->getUnitDie());
877  }
878 
879  // Passing null as the associated node because the abstract definition
880  // shouldn't be found by lookup.
881  AbsDef = &ContextCU->createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, nullptr);
882  ContextCU->applySubprogramAttributesToDefinition(SP, *AbsDef);
883 
884  if (!ContextCU->includeMinimalInlineScopes())
885  ContextCU->addUInt(*AbsDef, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
886  if (DIE *ObjectPointer = ContextCU->createAndAddScopeChildren(Scope, *AbsDef))
887  ContextCU->addDIEEntry(*AbsDef, dwarf::DW_AT_object_pointer, *ObjectPointer);
888 }
889 
890 /// Whether to use the GNU analog for a DWARF5 tag, attribute, or location atom.
892  return DD->getDwarfVersion() == 4 && DD->tuneForGDB();
893 }
894 
897  return Tag;
898  switch (Tag) {
899  case dwarf::DW_TAG_call_site:
900  return dwarf::DW_TAG_GNU_call_site;
901  case dwarf::DW_TAG_call_site_parameter:
902  return dwarf::DW_TAG_GNU_call_site_parameter;
903  default:
904  llvm_unreachable("DWARF5 tag with no GNU analog");
905  }
906 }
907 
911  return Attr;
912  switch (Attr) {
913  case dwarf::DW_AT_call_all_calls:
914  return dwarf::DW_AT_GNU_all_call_sites;
915  case dwarf::DW_AT_call_target:
916  return dwarf::DW_AT_GNU_call_site_target;
917  case dwarf::DW_AT_call_origin:
918  return dwarf::DW_AT_abstract_origin;
919  case dwarf::DW_AT_call_pc:
920  return dwarf::DW_AT_low_pc;
921  case dwarf::DW_AT_call_value:
922  return dwarf::DW_AT_GNU_call_site_value;
923  case dwarf::DW_AT_call_tail_call:
924  return dwarf::DW_AT_GNU_tail_call;
925  default:
926  llvm_unreachable("DWARF5 attribute with no GNU analog");
927  }
928 }
929 
933  return Loc;
934  switch (Loc) {
935  case dwarf::DW_OP_entry_value:
936  return dwarf::DW_OP_GNU_entry_value;
937  default:
938  llvm_unreachable("DWARF5 location atom with no GNU analog");
939  }
940 }
941 
943  DIE &ScopeDIE, const DISubprogram *CalleeSP, bool IsTail,
944  const MCSymbol *PCAddr, const MCExpr *PCOffset, unsigned CallReg) {
945  // Insert a call site entry DIE within ScopeDIE.
946  DIE &CallSiteDIE = createAndAddDIE(getDwarf5OrGNUTag(dwarf::DW_TAG_call_site),
947  ScopeDIE, nullptr);
948 
949  if (CallReg) {
950  // Indirect call.
951  addAddress(CallSiteDIE, getDwarf5OrGNUAttr(dwarf::DW_AT_call_target),
952  MachineLocation(CallReg));
953  } else {
954  DIE *CalleeDIE = getOrCreateSubprogramDIE(CalleeSP);
955  assert(CalleeDIE && "Could not create DIE for call site entry origin");
956  addDIEEntry(CallSiteDIE, getDwarf5OrGNUAttr(dwarf::DW_AT_call_origin),
957  *CalleeDIE);
958  }
959 
960  if (IsTail)
961  // Attach DW_AT_call_tail_call to tail calls for standards compliance.
962  addFlag(CallSiteDIE, getDwarf5OrGNUAttr(dwarf::DW_AT_call_tail_call));
963 
964  // Attach the return PC to allow the debugger to disambiguate call paths
965  // from one function to another.
966  if (DD->getDwarfVersion() == 4 && DD->tuneForGDB()) {
967  assert(PCAddr && "Missing PC information for a call");
968  addLabelAddress(CallSiteDIE, dwarf::DW_AT_low_pc, PCAddr);
969  } else if (!IsTail || DD->tuneForGDB()) {
970  assert(PCOffset && "Missing return PC information for a call");
971  addAddressExpr(CallSiteDIE, dwarf::DW_AT_call_return_pc, PCOffset);
972  }
973 
974  return CallSiteDIE;
975 }
976 
978  DIE &CallSiteDIE, SmallVector<DbgCallSiteParam, 4> &Params) {
979  for (const auto &Param : Params) {
980  unsigned Register = Param.getRegister();
981  auto CallSiteDieParam =
983  getDwarf5OrGNUTag(dwarf::DW_TAG_call_site_parameter));
984  insertDIE(CallSiteDieParam);
985  addAddress(*CallSiteDieParam, dwarf::DW_AT_location,
986  MachineLocation(Register));
987 
988  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
989  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
990  DwarfExpr.setCallSiteParamValueFlag();
991 
992  DwarfDebug::emitDebugLocValue(*Asm, nullptr, Param.getValue(), DwarfExpr);
993 
994  addBlock(*CallSiteDieParam, getDwarf5OrGNUAttr(dwarf::DW_AT_call_value),
995  DwarfExpr.finalize());
996 
997  CallSiteDIE.addChild(CallSiteDieParam);
998  }
999 }
1000 
1002  const DIImportedEntity *Module) {
1003  DIE *IMDie = DIE::get(DIEValueAllocator, (dwarf::Tag)Module->getTag());
1004  insertDIE(Module, IMDie);
1005  DIE *EntityDie;
1006  auto *Entity = Module->getEntity();
1007  if (auto *NS = dyn_cast<DINamespace>(Entity))
1008  EntityDie = getOrCreateNameSpace(NS);
1009  else if (auto *M = dyn_cast<DIModule>(Entity))
1010  EntityDie = getOrCreateModule(M);
1011  else if (auto *SP = dyn_cast<DISubprogram>(Entity))
1012  EntityDie = getOrCreateSubprogramDIE(SP);
1013  else if (auto *T = dyn_cast<DIType>(Entity))
1014  EntityDie = getOrCreateTypeDIE(T);
1015  else if (auto *GV = dyn_cast<DIGlobalVariable>(Entity))
1016  EntityDie = getOrCreateGlobalVariableDIE(GV, {});
1017  else
1018  EntityDie = getDIE(Entity);
1019  assert(EntityDie);
1020  addSourceLine(*IMDie, Module->getLine(), Module->getFile());
1021  addDIEEntry(*IMDie, dwarf::DW_AT_import, *EntityDie);
1022  StringRef Name = Module->getName();
1023  if (!Name.empty())
1024  addString(*IMDie, dwarf::DW_AT_name, Name);
1025 
1026  return IMDie;
1027 }
1028 
1030  DIE *D = getDIE(SP);
1031  if (DIE *AbsSPDIE = getAbstractSPDies().lookup(SP)) {
1032  if (D)
1033  // If this subprogram has an abstract definition, reference that
1034  addDIEEntry(*D, dwarf::DW_AT_abstract_origin, *AbsSPDIE);
1035  } else {
1037  if (D)
1038  // And attach the attributes
1040  }
1041 }
1042 
1044  DbgEntity *AbsEntity = getExistingAbstractEntity(Entity->getEntity());
1045 
1046  auto *Die = Entity->getDIE();
1047  /// Label may be used to generate DW_AT_low_pc, so put it outside
1048  /// if/else block.
1049  const DbgLabel *Label = nullptr;
1050  if (AbsEntity && AbsEntity->getDIE()) {
1051  addDIEEntry(*Die, dwarf::DW_AT_abstract_origin, *AbsEntity->getDIE());
1052  Label = dyn_cast<const DbgLabel>(Entity);
1053  } else {
1054  if (const DbgVariable *Var = dyn_cast<const DbgVariable>(Entity))
1055  applyVariableAttributes(*Var, *Die);
1056  else if ((Label = dyn_cast<const DbgLabel>(Entity)))
1057  applyLabelAttributes(*Label, *Die);
1058  else
1059  llvm_unreachable("DbgEntity must be DbgVariable or DbgLabel.");
1060  }
1061 
1062  if (Label)
1063  if (const auto *Sym = Label->getSymbol())
1064  addLabelAddress(*Die, dwarf::DW_AT_low_pc, Sym);
1065 }
1066 
1068  auto &AbstractEntities = getAbstractEntities();
1069  auto I = AbstractEntities.find(Node);
1070  if (I != AbstractEntities.end())
1071  return I->second.get();
1072  return nullptr;
1073 }
1074 
1076  LexicalScope *Scope) {
1077  assert(Scope && Scope->isAbstractScope());
1078  auto &Entity = getAbstractEntities()[Node];
1079  if (isa<const DILocalVariable>(Node)) {
1080  Entity = std::make_unique<DbgVariable>(
1081  cast<const DILocalVariable>(Node), nullptr /* IA */);;
1082  DU->addScopeVariable(Scope, cast<DbgVariable>(Entity.get()));
1083  } else if (isa<const DILabel>(Node)) {
1084  Entity = std::make_unique<DbgLabel>(
1085  cast<const DILabel>(Node), nullptr /* IA */);
1086  DU->addScopeLabel(Scope, cast<DbgLabel>(Entity.get()));
1087  }
1088 }
1089 
1090 void DwarfCompileUnit::emitHeader(bool UseOffsets) {
1091  // Don't bother labeling the .dwo unit, as its offset isn't used.
1092  if (!Skeleton && !DD->useSectionsAsReferences()) {
1093  LabelBegin = Asm->createTempSymbol("cu_begin");
1094  Asm->OutStreamer->EmitLabel(LabelBegin);
1095  }
1096 
1097  dwarf::UnitType UT = Skeleton ? dwarf::DW_UT_split_compile
1098  : DD->useSplitDwarf() ? dwarf::DW_UT_skeleton
1099  : dwarf::DW_UT_compile;
1100  DwarfUnit::emitCommonHeader(UseOffsets, UT);
1101  if (DD->getDwarfVersion() >= 5 && UT != dwarf::DW_UT_compile)
1102  Asm->emitInt64(getDWOId());
1103 }
1104 
1106  switch (CUNode->getNameTableKind()) {
1108  return false;
1109  // Opting in to GNU Pubnames/types overrides the default to ensure these are
1110  // generated for things like Gold's gdb_index generation.
1112  return true;
1114  return DD->tuneForGDB() && !includeMinimalInlineScopes() &&
1117  DD->getDwarfVersion() < 5;
1118  }
1119  llvm_unreachable("Unhandled DICompileUnit::DebugNameTableKind enum");
1120 }
1121 
1122 /// addGlobalName - Add a new global name to the compile unit.
1124  const DIScope *Context) {
1125  if (!hasDwarfPubSections())
1126  return;
1127  std::string FullName = getParentContextString(Context) + Name.str();
1128  GlobalNames[FullName] = &Die;
1129 }
1130 
1132  const DIScope *Context) {
1133  if (!hasDwarfPubSections())
1134  return;
1135  std::string FullName = getParentContextString(Context) + Name.str();
1136  // Insert, allowing the entry to remain as-is if it's already present
1137  // This way the CU-level type DIE is preferred over the "can't describe this
1138  // type as a unit offset because it's not really in the CU at all, it's only
1139  // in a type unit"
1140  GlobalNames.insert(std::make_pair(std::move(FullName), &getUnitDie()));
1141 }
1142 
1143 /// Add a new global type to the unit.
1144 void DwarfCompileUnit::addGlobalType(const DIType *Ty, const DIE &Die,
1145  const DIScope *Context) {
1146  if (!hasDwarfPubSections())
1147  return;
1148  std::string FullName = getParentContextString(Context) + Ty->getName().str();
1149  GlobalTypes[FullName] = &Die;
1150 }
1151 
1153  const DIScope *Context) {
1154  if (!hasDwarfPubSections())
1155  return;
1156  std::string FullName = getParentContextString(Context) + Ty->getName().str();
1157  // Insert, allowing the entry to remain as-is if it's already present
1158  // This way the CU-level type DIE is preferred over the "can't describe this
1159  // type as a unit offset because it's not really in the CU at all, it's only
1160  // in a type unit"
1161  GlobalTypes.insert(std::make_pair(std::move(FullName), &getUnitDie()));
1162 }
1163 
1165  MachineLocation Location) {
1166  if (DV.hasComplexAddress())
1167  addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
1168  else
1169  addAddress(Die, dwarf::DW_AT_location, Location);
1170 }
1171 
1172 /// Add an address attribute to a die based on the location provided.
1174  const MachineLocation &Location) {
1175  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1176  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
1177  if (Location.isIndirect())
1178  DwarfExpr.setMemoryLocationKind();
1179 
1180  DIExpressionCursor Cursor({});
1182  if (!DwarfExpr.addMachineRegExpression(TRI, Cursor, Location.getReg()))
1183  return;
1184  DwarfExpr.addExpression(std::move(Cursor));
1185 
1186  // Now attach the location information to the DIE.
1187  addBlock(Die, Attribute, DwarfExpr.finalize());
1188 }
1189 
1190 /// Start with the address based on the location provided, and generate the
1191 /// DWARF information necessary to find the actual variable given the extra
1192 /// address information encoded in the DbgVariable, starting from the starting
1193 /// location. Add the DWARF information to the die.
1196  const MachineLocation &Location) {
1197  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1198  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
1199  const DIExpression *DIExpr = DV.getSingleExpression();
1200  DwarfExpr.addFragmentOffset(DIExpr);
1201  if (Location.isIndirect())
1202  DwarfExpr.setMemoryLocationKind();
1203 
1204  DIExpressionCursor Cursor(DIExpr);
1205 
1206  if (DIExpr->isEntryValue()) {
1207  DwarfExpr.setEntryValueFlag();
1208  DwarfExpr.beginEntryValueExpression(Cursor);
1209  }
1210 
1212  if (!DwarfExpr.addMachineRegExpression(TRI, Cursor, Location.getReg()))
1213  return;
1214  DwarfExpr.addExpression(std::move(Cursor));
1215 
1216  // Now attach the location information to the DIE.
1217  addBlock(Die, Attribute, DwarfExpr.finalize());
1218 }
1219 
1220 /// Add a Dwarf loclistptr attribute data and value.
1222  unsigned Index) {
1223  dwarf::Form Form = DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
1224  : dwarf::DW_FORM_data4;
1225  Die.addValue(DIEValueAllocator, Attribute, Form, DIELocList(Index));
1226 }
1227 
1229  DIE &VariableDie) {
1230  StringRef Name = Var.getName();
1231  if (!Name.empty())
1232  addString(VariableDie, dwarf::DW_AT_name, Name);
1233  const auto *DIVar = Var.getVariable();
1234  if (DIVar)
1235  if (uint32_t AlignInBytes = DIVar->getAlignInBytes())
1236  addUInt(VariableDie, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
1237  AlignInBytes);
1238 
1239  addSourceLine(VariableDie, DIVar);
1240  addType(VariableDie, Var.getType());
1241  if (Var.isArtificial())
1242  addFlag(VariableDie, dwarf::DW_AT_artificial);
1243 }
1244 
1246  DIE &LabelDie) {
1247  StringRef Name = Label.getName();
1248  if (!Name.empty())
1249  addString(LabelDie, dwarf::DW_AT_name, Name);
1250  const auto *DILabel = Label.getLabel();
1251  addSourceLine(LabelDie, DILabel);
1252 }
1253 
1254 /// Add a Dwarf expression attribute data and value.
1256  const MCExpr *Expr) {
1257  Die.addValue(DIEValueAllocator, (dwarf::Attribute)0, Form, DIEExpr(Expr));
1258 }
1259 
1261  const MCExpr *Expr) {
1262  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_addr,
1263  DIEExpr(Expr));
1264 }
1265 
1267  const DISubprogram *SP, DIE &SPDie) {
1268  auto *SPDecl = SP->getDeclaration();
1269  auto *Context = SPDecl ? SPDecl->getScope() : SP->getScope();
1271  addGlobalName(SP->getName(), SPDie, Context);
1272 }
1273 
1274 bool DwarfCompileUnit::isDwoUnit() const {
1275  return DD->useSplitDwarf() && Skeleton;
1276 }
1277 
1278 void DwarfCompileUnit::finishNonUnitTypeDIE(DIE& D, const DICompositeType *CTy) {
1279  constructTypeDIE(D, CTy);
1280 }
1281 
1284  (DD->useSplitDwarf() && !Skeleton);
1285 }
1286 
1289  MCSymbol *Label = DD->getAddressPool().getLabel();
1291  getDwarfVersion() >= 5 ? dwarf::DW_AT_addr_base
1292  : dwarf::DW_AT_GNU_addr_base,
1293  Label, TLOF.getDwarfAddrSection()->getBeginSymbol());
1294 }
1295 
1297  Die.addValue(DIEValueAllocator, (dwarf::Attribute)0, dwarf::DW_FORM_udata,
1298  new (DIEValueAllocator) DIEBaseTypeRef(this, Idx));
1299 }
1300 
1302  // Insert the base_type DIEs directly after the CU so that their offsets will
1303  // fit in the fixed size ULEB128 used inside the location expressions.
1304  // Maintain order by iterating backwards and inserting to the front of CU
1305  // child list.
1306  for (auto &Btr : reverse(ExprRefedBaseTypes)) {
1307  DIE &Die = getUnitDie().addChildFront(
1308  DIE::get(DIEValueAllocator, dwarf::DW_TAG_base_type));
1309  SmallString<32> Str;
1310  addString(Die, dwarf::DW_AT_name,
1311  Twine(dwarf::AttributeEncodingString(Btr.Encoding) +
1312  "_" + Twine(Btr.BitSize)).toStringRef(Str));
1313  addUInt(Die, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1, Btr.Encoding);
1314  addUInt(Die, dwarf::DW_AT_byte_size, None, Btr.BitSize / 8);
1315 
1316  Btr.Die = &Die;
1317  }
1318 }
const DICompileUnit * getCUNode() const
Definition: DwarfUnit.h:89
static void appendOffset(SmallVectorImpl< uint64_t > &Ops, int64_t Offset)
Append Ops with operations to apply the Offset.
const TargetLoweringObjectFile & getObjFileLowering() const
Return information about object file lowering.
Definition: AsmPrinter.cpp:216
DIE * getDIE() const
Definition: DwarfDebug.h:89
void emitInt64(uint64_t Value) const
Emit a long long directive and value.
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:1658
const DILocalScope * getScopeNode() const
Definition: LexicalScopes.h:63
LocationAtom
Definition: Dwarf.h:115
bool isConstant() const
Determine whether this represents a standalone constant value.
std::vector< BaseTypeRef > ExprRefedBaseTypes
void addFlag(DIE &Die, dwarf::Attribute Attribute)
Add a flag that is true to the DIE.
Definition: DwarfUnit.cpp:223
bool isEntryValue() const
Check if the expression consists of exactly one entry value operand.
bool supportDebugThreadLocalLocation() const
Target supports TLS offset relocation in debug section?
LLVM_NODISCARD std::string str() const
str - Get the contents as an std::string.
Definition: StringRef.h:232
LLVMContext & Context
unsigned getDebugLocListIndex() const
Definition: DwarfDebug.h:176
void addLabelDelta(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Hi, const MCSymbol *Lo)
Add a label delta attribute data and value.
Definition: DwarfUnit.cpp:360
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:93
DIELoc - Represents an expression location.
Definition: DIE.h:903
This class represents lattice values for constants.
Definition: AllocatorList.h:23
bool isAbstractScope() const
Definition: LexicalScopes.h:64
MCSection * getDwarfLineSection() const
void addUnsignedConstant(uint64_t Value)
Emit an unsigned constant.
DIE * getOrCreateStaticMemberDIE(const DIDerivedType *DT)
Create new static data member DIE.
Definition: DwarfUnit.cpp:1557
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:342
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:41
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:66
unsigned size() const
void setMemoryLocationKind()
Lock this down to become a memory location description.
amdgpu Simplify well known AMD library false FunctionCallee Value const Twine & Name
virtual int getFrameIndexReference(const MachineFunction &MF, int FI, unsigned &FrameReg) const
getFrameIndexReference - This method should return the base register and offset used to reference a f...
virtual const TargetRegisterInfo * getRegisterInfo() const
getRegisterInfo - If register information is available, return it.
void addGlobalName(StringRef Name, const DIE &Die, const DIScope *Context) override
Add a new global name to the compile unit.
void applyLabelAttributes(const DbgLabel &Label, DIE &LabelDie)
const DIType * getType() const
Definition: DwarfDebug.cpp:227
AccelTableKind getAccelTableKind() const
Returns what kind (if any) of accelerator tables to emit.
Definition: DwarfDebug.h:677
Attribute
Attributes.
Definition: Dwarf.h:102
static bool isPhysicalRegister(unsigned Reg)
Return true if the specified register number is in the physical register namespace.
Definition: Register.h:63
void insertDIE(const DINode *Desc, DIE *D)
Insert DIE into the map.
Definition: DwarfUnit.cpp:211
unsigned getReg() const
StringRef toStringRef(SmallVectorImpl< char > &Out) const
This returns the twine as a single StringRef if it can be represented as such.
Definition: Twine.h:455
Collects and handles dwarf debug information.
Definition: DwarfDebug.h:292
void beginEntryValueExpression(DIExpressionCursor &ExprCursor)
Begin emission of an entry value dwarf operation.
bool useGNUTLSOpcode() const
Returns whether to use DW_OP_GNU_push_tls_address, instead of the standard DW_OP_form_tls_address opc...
Definition: DwarfDebug.h:651
SmallVectorImpl< InsnRange > & getRanges()
Definition: LexicalScopes.h:66
This class is defined as the common parent of DbgVariable and DbgLabel such that it could levarage po...
Definition: DwarfDebug.h:69
void addRange(RangeSpan Range)
addRange - Add an address range to the list of ranges for this unit.
bool hasDLLImportStorageClass() const
Definition: GlobalValue.h:265
void attachLowHighPC(DIE &D, const MCSymbol *Begin, const MCSymbol *End)
unsigned const TargetRegisterInfo * TRI
MachineFunction * MF
The current machine function.
Definition: AsmPrinter.h:96
dwarf::Tag getDwarf5OrGNUTag(dwarf::Tag Tag) const
This takes a DWARF 5 tag and returns it or a GNU analog.
DwarfCompileUnit & getCU() override
void reserve(size_type N)
Definition: SmallVector.h:369
Represents a pointer to a location list in the debug_loc section.
Definition: DIE.h:331
LexicalScope - This class is used to track scope information.
Definition: LexicalScopes.h:44
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:725
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:1667
const MachineFunction * getCurrentFunction() const
Definition: DwarfDebug.h:734
StringRef getName() const
AsmPrinter * Asm
Target of Dwarf emission.
Definition: DwarfUnit.h:49
Tuple of metadata.
Definition: Metadata.h:1105
Tagged DWARF-like metadata node.
void constructTypeDIE(DIE &Buffer, const DICompositeType *CTy)
Definition: DwarfUnit.cpp:873
bool useSplitDwarf() const
Returns whether or not to change the current debug info for the split dwarf proposal support...
Definition: DwarfDebug.h:685
const MCSymbol * getSymbol() const
Definition: DwarfDebug.h:241
DIE * getDIE(const DINode *D) const
Returns the DIE map slot for the specified debug variable.
Definition: DwarfUnit.cpp:205
DbgEntity * getExistingAbstractEntity(const DINode *Node)
dwarf::LocationAtom getDwarf5OrGNULocationAtom(dwarf::LocationAtom Loc) const
This takes a DWARF 5 location atom and either returns it or a GNU analog.
void attachRangesOrLowHighPC(DIE &D, SmallVector< RangeSpan, 2 > Ranges)
StringRef getName() const
void addArangeLabel(SymbolCU SCU)
Add a label so that arange data can be generated for it.
Definition: DwarfDebug.h:637
StringRef getName() const
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:80
bool isDebugDirectivesOnly() const
DIE * getOrCreateCommonBlock(const DICommonBlock *CB, ArrayRef< GlobalExpr > GlobalExprs)
SmallVectorImpl< LexicalScope * > & getChildren()
Definition: LexicalScopes.h:65
unsigned getTag() const
void addComplexAddress(const DbgVariable &DV, DIE &Die, dwarf::Attribute Attribute, const MachineLocation &Location)
Start with the address based on the location provided, and generate the DWARF information necessary t...
LexicalScope * getParent() const
Definition: LexicalScopes.h:60
DIE & addChildFront(DIE *Child)
Definition: DIE.h:826
bool isObjectPointer() const
Definition: DwarfDebug.h:202
void constructCallSiteParmEntryDIEs(DIE &CallSiteDIE, SmallVector< DbgCallSiteParam, 4 > &Params)
Construct call site parameter DIEs for the CallSiteDIE.
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: APFloat.h:41
StringRef getName() const
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:35
void addSubprogramNames(const DICompileUnit &CU, const DISubprogram *SP, DIE &Die)
Definition: DwarfDebug.cpp:451
void addConstantFPValue(DIE &Die, const MachineOperand &MO)
Add constant value entry in variable DIE.
Definition: DwarfUnit.cpp:510
void emitHeader(bool UseOffsets) override
Emit the header for this unit, not including the initial length field.
void addGlobalTypeUnitType(const DIType *Ty, const DIScope *Context)
Add a new global type present in a type unit to this compile unit.
void setCallSiteParamValueFlag()
Lock this down to become a call site parameter location.
bool isLexicalScopeDIENull(LexicalScope *Scope)
A helper function to check whether the DIE for a given Scope is going to be null. ...
Definition: DwarfDebug.cpp:485
DIE & constructCallSiteEntryDIE(DIE &ScopeDIE, const DISubprogram *CalleeSP, bool IsTail, const MCSymbol *PCAddr, const MCExpr *PCOffset, unsigned CallReg)
Construct a call site entry DIE describing a call within Scope to a callee described by CalleeSP...
void addAccelName(const DICompileUnit &CU, StringRef Name, const DIE &Die)
DenseMap< LexicalScope *, ScopeVars > & getScopeVariables()
Definition: DwarfFile.h:165
Holds a DIExpression and keeps track of how many operands have been consumed so far.
DISubprogram * getDISubprogram(const MDNode *Scope)
Find subprogram that is enclosing this scope.
Definition: DebugInfo.cpp:43
static bool useGNUAnalogForDwarf5Feature(DwarfDebug *DD)
Whether to use the GNU analog for a DWARF5 tag, attribute, or location atom.
static const uint16_t * lookup(unsigned opcode, unsigned domain, ArrayRef< uint16_t[3]> Table)
LLVM_NODISCARD bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:140
StringRef getFilename() const
const MCSymbol * Begin
Definition: DwarfFile.h:36
DIE * getOrCreateTypeDIE(const MDNode *TyNode)
Find existing DIE or create new DIE for the given type.
Definition: DwarfUnit.cpp:680
void addBlock(DIE &Die, dwarf::Attribute Attribute, DIELoc *Loc)
Add block data.
Definition: DwarfUnit.cpp:402
const MCSymbol * End
Definition: DwarfFile.h:37
void createAbstractEntity(const DINode *Node, LexicalScope *Scope)
static Optional< DebugNameTableKind > getNameTableKind(StringRef Str)
void addString(DIE &Die, dwarf::Attribute Attribute, StringRef Str)
Add a string attribute data and value.
Definition: DwarfUnit.cpp:258
DIE * constructInlinedScopeDIE(LexicalScope *Scope)
This scope represents inlined body of a function.
auto reverse(ContainerTy &&C, typename std::enable_if< has_rbegin< ContainerTy >::value >::type *=nullptr) -> decltype(make_range(C.rbegin(), C.rend()))
Definition: STLExtras.h:261
AddressPool & getAddressPool()
Definition: DwarfDebug.h:722
Subprogram description.
unsigned getUniqueID() const
DIScope * getScope() const
const DIExpression * getSingleExpression() const
Definition: DwarfDebug.h:170
MCSymbol * getFunctionBegin() const
Definition: AsmPrinter.h:212
uint64_t getDWOId() const
This class is used to track local variable information.
Definition: DwarfDebug.h:118
bool DisableFramePointerElim(const MachineFunction &MF) const
DisableFramePointerElim - This returns true if frame pointer elimination optimization should be disab...
void addAddrTableBase()
Add the DW_AT_addr_base attribute to the unit DIE.
const DILocalVariable * getVariable() const
Definition: DwarfDebug.h:166
A list of DIE values.
Definition: DIE.h:635
DIE * constructVariableDIE(DbgVariable &DV, bool Abstract=false)
constructVariableDIE - Construct a DIE for the given DbgVariable.
void addAddressExpr(DIE &Die, dwarf::Attribute Attribute, const MCExpr *Expr)
Add an attribute containing an address expression to Die.
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory)...
Definition: APInt.h:32
.apple_names, .apple_namespaces, .apple_types, .apple_objc.
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:1078
Debug location.
DIE & addChild(DIE *Child)
Add a child to the DIE.
Definition: DIE.h:819
DIScope * getScope() const
void addExpr(DIELoc &Die, dwarf::Form Form, const MCExpr *Expr)
Add a Dwarf expression attribute data and value.
const DwarfCompileUnit * getPrevCU() const
Returns the previous CU that was being updated.
Definition: DwarfDebug.h:703
bool hasComplexAddress() const
Definition: DwarfDebug.h:210
This class is used to track label information.
Definition: DwarfDebug.h:230
void addConstantValue(DIE &Die, const MachineOperand &MO, const DIType *Ty)
Add constant value entry in variable DIE.
Definition: DwarfUnit.cpp:542
dwarf::Attribute getDwarf5OrGNUAttr(dwarf::Attribute Attr) const
This takes a DWARF 5 attribute and returns it or a GNU analog.
bool useEmulatedTLS() const
Returns true if this target uses emulated TLS.
static DIE * get(BumpPtrAllocator &Alloc, dwarf::Tag Tag)
Definition: DIE.h:742
void applySubprogramAttributes(const DISubprogram *SP, DIE &SPDie, bool SkipSPAttributes=false)
Definition: DwarfUnit.cpp:1198
void addSourceLine(DIE &Die, unsigned Line, const DIFile *File)
Add location information to specified debug information entry.
Definition: DwarfUnit.cpp:416
This dwarf writer support class manages information associated with a source file.
Definition: DwarfUnit.h:40
void addLocationList(DIE &Die, dwarf::Attribute Attribute, unsigned Index)
Add a Dwarf loclistptr attribute data and value.
StringRef AttributeEncodingString(unsigned Encoding)
Definition: Dwarf.cpp:191
MCSection * getDwarfAddrSection() const
const TargetSubtargetInfo & getSubtarget() const
getSubtarget - Return the subtarget for which this machine code is being compiled.
const DILocation * getInlinedAt() const
Definition: LexicalScopes.h:62
Instrumentation for Order File
unsigned getPointerSize(unsigned AS=0) const
Layout pointer size FIXME: The defaults need to be removed once all of the backends/clients are updat...
Definition: DataLayout.cpp:654
A structured debug information entry.
Definition: DIE.h:712
void setEntryValueFlag()
Lock this down to become an entry value location.
DIE & getUnitDie()
Definition: DIE.h:891
TargetMachine & TM
Target machine description.
Definition: AsmPrinter.h:81
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:78
An expression DIE.
Definition: DIE.h:201
unsigned getOrCreateSourceID(const DIFile *File) override
Look up the source ID for the given file.
DIE * createScopeChildrenDIE(LexicalScope *Scope, SmallVectorImpl< DIE *> &Children, bool *HasNonScopeChildren=nullptr)
A helper function to create children of a Scope DIE.
void finishEntityDefinition(const DbgEntity *Entity)
void setDIE(DIE &D)
Definition: DwarfDebug.h:93
MDTuple * getTemplateParams() const
DwarfCompileUnit(unsigned UID, const DICompileUnit *Node, AsmPrinter *A, DwarfDebug *DW, DwarfFile *DWU)
DIDerivedType * getStaticDataMemberDeclaration() const
void emitCommonHeader(bool UseOffsets, dwarf::UnitType UT)
Emit the common part of the header for this unit.
Definition: DwarfUnit.cpp:1604
void addAddress(DIE &Die, dwarf::Attribute Attribute, const MachineLocation &Location)
Add an address attribute to a die based on the location provided.
A BaseTypeRef DIE.
Definition: DIE.h:235
A label DIE.
Definition: DIE.h:218
DIE * getOrCreateSubprogramDIE(const DISubprogram *SP, bool Minimal=false)
Definition: DwarfUnit.cpp:1123
const Triple & getTargetTriple() const
bool hasFrameIndexExprs() const
Definition: DwarfDebug.h:181
Base class for variables.
DIE * createAndAddScopeChildren(LexicalScope *Scope, DIE &ScopeDIE)
const DILabel * getLabel() const
Accessors.
Definition: DwarfDebug.h:240
bool addScopeVariable(LexicalScope *LS, DbgVariable *Var)
Definition: DwarfFile.cpp:104
void addLabelAddress(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Label)
addLabelAddress - Add a dwarf label attribute data and value using either DW_FORM_addr or DW_FORM_GNU...
dwarf::Tag getTag() const
Definition: DwarfDebug.h:185
Helper used to pair up a symbol and its DWARF compile unit.
Definition: DwarfDebug.h:276
DIScope * getScope() const
StringRef getDirectory() const
bool useAllLinkageNames() const
Returns whether we should emit all DW_AT_[MIPS_]linkage_name.
Definition: DwarfDebug.h:647
MCSymbol * getLabelAfterInsn(const MachineInstr *MI)
Return Label immediately following the instruction.
TargetRegisterInfo base class - We assume that the target defines a static array of TargetRegisterDes...
element_iterator elements_end() const
size_t size() const
Definition: SmallVector.h:52
void addScopeRangeList(DIE &ScopeDIE, SmallVector< RangeSpan, 2 > Range)
A helper function to construct a RangeSpanList for a given lexical scope.
uint64_t getElement(unsigned I) const
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
ArrayRef< FrameIndexExpr > getFrameIndexExprs() const
Get the FI entries, sorted by fragment offset.
Definition: DwarfDebug.cpp:268
An imported module (C++ using directive or similar).
Base class for scope-like contexts.
DIE * constructImportedEntityDIE(const DIImportedEntity *Module)
Construct import_module DIE.
std::string getParentContextString(const DIScope *Context) const
Get string containing language specific context for a global name.
Definition: DwarfUnit.cpp:731
UnitType
Constants for unit types in DWARF v5.
Definition: Dwarf.h:366
void addExpression(DIExpressionCursor &&Expr, unsigned FragmentOffsetInBits=0)
Emit all remaining operations in the DIExpressionCursor.
DIE * constructLabelDIE(DbgLabel &DL, const LexicalScope &Scope)
Construct a DIE for the given DbgLabel.
bool tuneForGDB() const
Definition: DwarfDebug.h:750
void constructAbstractSubprogramScopeDIE(LexicalScope *Scope)
void addScopeLabel(LexicalScope *LS, DbgLabel *Label)
Definition: DwarfFile.cpp:121
bool useSectionsAsReferences() const
Returns whether to use sections as labels rather than temp symbols.
Definition: DwarfDebug.h:664
DenseMap< LexicalScope *, LabelList > & getScopeLabels()
Definition: DwarfFile.h:169
StringRef getName() const
Definition: DwarfDebug.h:243
void setPrevCU(const DwarfCompileUnit *PrevCU)
Definition: DwarfDebug.h:704
Base class for types.
static Optional< DebugEmissionKind > getEmissionKind(StringRef Str)
StringRef getName() const
MCSymbol * getSymbol(const GlobalValue *GV) const
Definition: AsmPrinter.cpp:449
DwarfCompileUnit * lookupCU(const DIE *Die)
Find the matching DwarfCompileUnit for the given CU DIE.
Definition: DwarfDebug.h:741
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.
Information about stack frame layout on the target.
void addLinkageName(DIE &Die, StringRef LinkageName)
Add a linkage name, if it isn&#39;t empty.
Definition: DwarfUnit.cpp:593
void applySubprogramAttributesToDefinition(const DISubprogram *SP, DIE &SPDie)
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:311
MCSymbol * getBeginSymbol()
Definition: MCSection.h:110
void finishSubprogramDefinition(const DISubprogram *SP)
static GCRegistry::Add< StatepointGC > D("statepoint-example", "an example strategy for statepoint")
bool useAppleExtensionAttributes() const
Definition: DwarfDebug.h:679
MCSymbol * getFunctionEnd() const
Definition: AsmPrinter.h:213
static SmallVector< const DIVariable *, 2 > dependencies(DbgVariable *Var)
Return all DIVariables that appear in count: expressions.
StringRef getDisplayName() const
DWARF expression.
void addTemplateParams(DIE &Buffer, DINodeArray TParams)
Add template parameters in buffer.
Definition: DwarfUnit.cpp:601
Implements a dense probed hash-table based set with some number of buckets stored inline...
Definition: DenseSet.h:267
DIType * getType() const
StringRef getLinkageName() const
DIE & constructSubprogramScopeDIE(const DISubprogram *Sub, LexicalScope *Scope)
Construct a DIE for this subprogram scope.
This file contains constants used for implementing Dwarf debug support.
bool isDefined() const
isDefined - Check if this symbol is defined (i.e., it has an address).
Definition: MCSymbol.h:249
DwarfDebug * DD
Definition: DwarfUnit.h:55
MCSymbol * getLabel()
Definition: AddressPool.h:53
StringRef getName() const
Definition: DwarfDebug.h:177
MCSection & getSection() const
Get the section associated with a defined, non-absolute symbol.
Definition: MCSymbol.h:268
Optional< uint8_t > TagOffset
virtual const MCSymbol * getFunctionFrameSymbol() const
Return symbol for the function pseudo stack if the stack frame is not a register based.
Definition: AsmPrinter.h:210
void addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIE &Entry)
Add a DIE attribute data and value.
Definition: DwarfUnit.cpp:366
iterator insert(iterator I, T &&Elt)
Definition: SmallVector.h:467
void append(in_iter in_start, in_iter in_end)
Add the specified range to the end of the SmallVector.
Definition: SmallVector.h:387
DIE * getOrCreateContextDIE(const DIScope *Context)
Get context owner&#39;s DIE.
Definition: DwarfUnit.cpp:619
dwarf::Tag getTag() const
Translate tag to proper Dwarf tag.
Definition: DwarfDebug.h:247
An integer value DIE.
Definition: DIE.h:163
DIE * getOrCreateGlobalVariableDIE(const DIGlobalVariable *GV, ArrayRef< GlobalExpr > GlobalExprs)
Get or create global variable DIE.
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:395
LLVM_NODISCARD bool empty() const
Definition: SmallVector.h:55
bool useRangesSection() const
Returns whether ranges section should be emitted.
Definition: DwarfDebug.h:661
void addVariableAddress(const DbgVariable &DV, DIE &Die, MachineLocation Location)
Add DW_AT_location attribute for a DbgVariable based on provided MachineLocation. ...
DIGlobalVariable * getDecl() const
TargetOptions Options
const NodeList & List
Definition: RDFGraph.cpp:201
#define I(x, y, z)
Definition: MD5.cpp:58
void addGlobalType(const DIType *Ty, const DIE &Die, const DIScope *Context) override
Add a new global type to the compile unit.
virtual const TargetFrameLowering * getFrameLowering() const
void applyVariableAttributes(const DbgVariable &Var, DIE &VariableDie)
Optional< StringRef > getSource() const
element_iterator elements_begin() const
DIE * getOrCreateModule(const DIModule *M)
Definition: DwarfUnit.cpp:1099
static SmallVector< DbgVariable *, 8 > sortLocalVars(SmallVectorImpl< DbgVariable *> &Input)
Sort local variables so that variables appearing inside of helper expressions come first...
LLVM_NODISCARD std::enable_if<!is_simple_type< Y >::value, typename cast_retty< X, const Y >::ret_type >::type dyn_cast(const Y &Val)
Definition: Casting.h:332
void addBaseTypeRef(DIEValueList &Die, int64_t Idx)
bool includeMinimalInlineScopes() const
size_type count(const_arg_type_t< ValueT > V) const
Return 1 if the specified key is in the set, 0 otherwise.
Definition: DenseSet.h:91
const DICompileUnit * CUNode
MDNode for the compile unit.
Definition: DwarfUnit.h:43
const LLVMTargetMachine & getTarget() const
getTarget - Return the target machine this machine code is compiled with
DwarfExpression implementation for singular DW_AT_location.
uint16_t getDwarfVersion() const
Definition: DwarfUnit.h:91
void addFragmentOffset(const DIExpression *Expr)
If applicable, emit an empty DW_OP_piece / DW_OP_bit_piece to advance to the fragment described by Ex...
MCSymbol * getLabelBeforeInsn(const MachineInstr *MI)
Return Label preceding the instruction.
BumpPtrAllocator DIEValueAllocator
Definition: DwarfUnit.h:46
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
DINode * getEntity() const
DIFile * getFile() const
uint32_t getAlignInBytes() const
void addLocalLabelAddress(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Label)
addLocalLabelAddress - Add a dwarf label attribute data and value using DW_FORM_addr only...
uint16_t getDwarfVersion() const
Returns the Dwarf Version.
DIE & updateSubprogramScopeDIE(const DISubprogram *SP)
Find DIE for the given subprogram and attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes...
void constructScopeDIE(LexicalScope *Scope, SmallVectorImpl< DIE *> &FinalChildren)
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:232
const DataLayout & getDataLayout() const
Return information about data layout.
Definition: AsmPrinter.cpp:220
bool isThreadLocal() const
If the value is "Thread Local", its value isn&#39;t shared by the threads.
Definition: GlobalValue.h:250
const DINode * getEntity() const
Accessors.
Definition: DwarfDebug.h:87
bool isNVPTX() const
Tests whether the target is NVPTX (32- or 64-bit).
Definition: Triple.h:689
unsigned getLineNo() const
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
const DbgValueLoc * getValueLoc() const
Definition: DwarfDebug.h:178
MCSection * getDwarfRangesSection() const
DwarfFile * DU
Definition: DwarfUnit.h:56
void addLocationAttribute(DIE *ToDIE, const DIGlobalVariable *GV, ArrayRef< GlobalExpr > GlobalExprs)
virtual const MCExpr * getDebugThreadLocalSymbol(const MCSymbol *Sym) const
Create a symbol reference to describe the given TLS variable when emitting the address in debug info...
static void emitDebugLocValue(const AsmPrinter &AP, const DIBasicType *BT, const DbgValueLoc &Value, DwarfExpression &DwarfExpr)
void applyStmtList(DIE &D)
Apply the DW_AT_stmt_list from this compile unit to the specified DIE.
MCSymbol * createTempSymbol(const Twine &Name) const
bool addMachineRegExpression(const TargetRegisterInfo &TRI, DIExpressionCursor &Expr, unsigned MachineReg, unsigned FragmentOffsetInBits=0)
Emit a machine register location.
bool isArtificial() const
Return true if DbgVariable is artificial.
Definition: DwarfDebug.h:194
value_iterator addValue(BumpPtrAllocator &Alloc, const DIEValue &V)
Definition: DIE.h:686
std::pair< const MachineInstr *, const MachineInstr * > InsnRange
InsnRange - This is used to track range of instructions with identical lexical scope.
Definition: LexicalScopes.h:39
Wrapper class representing virtual and physical registers.
Definition: Register.h:19
static const DIExpression * extractAddressClass(const DIExpression *Expr, unsigned &AddrClass)
Checks if the last 4 elements of the expression are DW_OP_constu <DWARF address="" space>=""> DW_OP_s...
DIE * constructLexicalScopeDIE(LexicalScope *Scope)
Construct new DW_TAG_lexical_block for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels...
unsigned getIndex(const MCSymbol *Sym, bool TLS=false)
Returns the index into the address pool with the given label/symbol.
Definition: AddressPool.cpp:19