LLVM  7.0.0svn
DwarfCompileUnit.cpp
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1 //===- llvm/CodeGen/DwarfCompileUnit.cpp - Dwarf Compile Units ------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file contains support for constructing a dwarf compile unit.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "DwarfCompileUnit.h"
15 #include "AddressPool.h"
16 #include "DwarfDebug.h"
17 #include "DwarfExpression.h"
18 #include "DwarfUnit.h"
19 #include "llvm/ADT/None.h"
20 #include "llvm/ADT/STLExtras.h"
21 #include "llvm/ADT/SmallVector.h"
22 #include "llvm/ADT/StringRef.h"
25 #include "llvm/CodeGen/DIE.h"
34 #include "llvm/IR/DataLayout.h"
35 #include "llvm/IR/DebugInfo.h"
37 #include "llvm/IR/GlobalVariable.h"
38 #include "llvm/MC/MCSection.h"
39 #include "llvm/MC/MCStreamer.h"
40 #include "llvm/MC/MCSymbol.h"
42 #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)
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, dwarf::DW_FORM_GNU_addr_index,
80  DIEInteger(idx));
81 }
82 
85  const MCSymbol *Label) {
86  if (Label)
87  DD->addArangeLabel(SymbolCU(this, Label));
88 
89  if (Label)
90  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_addr,
91  DIELabel(Label));
92  else
93  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_addr,
94  DIEInteger(0));
95 }
96 
98  // If we print assembly, we can't separate .file entries according to
99  // compile units. Thus all files will belong to the default compile unit.
100 
101  // FIXME: add a better feature test than hasRawTextSupport. Even better,
102  // extend .file to support this.
103  unsigned CUID = Asm->OutStreamer->hasRawTextSupport() ? 0 : getUniqueID();
104  if (!File)
105  return Asm->OutStreamer->EmitDwarfFileDirective(0, "", "", nullptr, CUID);
106  return Asm->OutStreamer->EmitDwarfFileDirective(
107  0, File->getDirectory(), File->getFilename(), getMD5AsBytes(File), CUID);
108 }
109 
111  const DIGlobalVariable *GV, ArrayRef<GlobalExpr> GlobalExprs) {
112  // Check for pre-existence.
113  if (DIE *Die = getDIE(GV))
114  return Die;
115 
116  assert(GV);
117 
118  auto *GVContext = GV->getScope();
119  auto *GTy = DD->resolve(GV->getType());
120 
121  // Construct the context before querying for the existence of the DIE in
122  // case such construction creates the DIE.
123  DIE *ContextDIE = getOrCreateContextDIE(GVContext);
124 
125  // Add to map.
126  DIE *VariableDIE = &createAndAddDIE(GV->getTag(), *ContextDIE, GV);
127  DIScope *DeclContext;
128  if (auto *SDMDecl = GV->getStaticDataMemberDeclaration()) {
129  DeclContext = resolve(SDMDecl->getScope());
130  assert(SDMDecl->isStaticMember() && "Expected static member decl");
131  assert(GV->isDefinition());
132  // We need the declaration DIE that is in the static member's class.
133  DIE *VariableSpecDIE = getOrCreateStaticMemberDIE(SDMDecl);
134  addDIEEntry(*VariableDIE, dwarf::DW_AT_specification, *VariableSpecDIE);
135  // If the global variable's type is different from the one in the class
136  // member type, assume that it's more specific and also emit it.
137  if (GTy != DD->resolve(SDMDecl->getBaseType()))
138  addType(*VariableDIE, GTy);
139  } else {
140  DeclContext = GV->getScope();
141  // Add name and type.
142  addString(*VariableDIE, dwarf::DW_AT_name, GV->getDisplayName());
143  addType(*VariableDIE, GTy);
144 
145  // Add scoping info.
146  if (!GV->isLocalToUnit())
147  addFlag(*VariableDIE, dwarf::DW_AT_external);
148 
149  // Add line number info.
150  addSourceLine(*VariableDIE, GV);
151  }
152 
153  if (!GV->isDefinition())
154  addFlag(*VariableDIE, dwarf::DW_AT_declaration);
155  else
156  addGlobalName(GV->getName(), *VariableDIE, DeclContext);
157 
158  if (uint32_t AlignInBytes = GV->getAlignInBytes())
159  addUInt(*VariableDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
160  AlignInBytes);
161 
162  // Add location.
163  bool addToAccelTable = false;
164  DIELoc *Loc = nullptr;
165  std::unique_ptr<DIEDwarfExpression> DwarfExpr;
166  for (const auto &GE : GlobalExprs) {
167  const GlobalVariable *Global = GE.Var;
168  const DIExpression *Expr = GE.Expr;
169 
170  // For compatibility with DWARF 3 and earlier,
171  // DW_AT_location(DW_OP_constu, X, DW_OP_stack_value) becomes
172  // DW_AT_const_value(X).
173  if (GlobalExprs.size() == 1 && Expr && Expr->isConstant()) {
174  addToAccelTable = true;
175  addConstantValue(*VariableDIE, /*Unsigned=*/true, Expr->getElement(1));
176  break;
177  }
178 
179  // We cannot describe the location of dllimport'd variables: the
180  // computation of their address requires loads from the IAT.
181  if (Global && Global->hasDLLImportStorageClass())
182  continue;
183 
184  // Nothing to describe without address or constant.
185  if (!Global && (!Expr || !Expr->isConstant()))
186  continue;
187 
188  if (!Loc) {
189  addToAccelTable = true;
190  Loc = new (DIEValueAllocator) DIELoc;
191  DwarfExpr = llvm::make_unique<DIEDwarfExpression>(*Asm, *this, *Loc);
192  }
193 
194  if (Global) {
195  const MCSymbol *Sym = Asm->getSymbol(Global);
196  if (Global->isThreadLocal()) {
197  if (Asm->TM.Options.EmulatedTLS) {
198  // TODO: add debug info for emulated thread local mode.
199  } else {
200  // FIXME: Make this work with -gsplit-dwarf.
201  unsigned PointerSize = Asm->getDataLayout().getPointerSize();
202  assert((PointerSize == 4 || PointerSize == 8) &&
203  "Add support for other sizes if necessary");
204  // Based on GCC's support for TLS:
205  if (!DD->useSplitDwarf()) {
206  // 1) Start with a constNu of the appropriate pointer size
207  addUInt(*Loc, dwarf::DW_FORM_data1,
208  PointerSize == 4 ? dwarf::DW_OP_const4u
209  : dwarf::DW_OP_const8u);
210  // 2) containing the (relocated) offset of the TLS variable
211  // within the module's TLS block.
212  addExpr(*Loc, dwarf::DW_FORM_udata,
214  } else {
215  addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
216  addUInt(*Loc, dwarf::DW_FORM_udata,
217  DD->getAddressPool().getIndex(Sym, /* TLS */ true));
218  }
219  // 3) followed by an OP to make the debugger do a TLS lookup.
220  addUInt(*Loc, dwarf::DW_FORM_data1,
221  DD->useGNUTLSOpcode() ? dwarf::DW_OP_GNU_push_tls_address
222  : dwarf::DW_OP_form_tls_address);
223  }
224  } else {
225  DD->addArangeLabel(SymbolCU(this, Sym));
226  addOpAddress(*Loc, Sym);
227  }
228  }
229  if (Expr) {
230  DwarfExpr->addFragmentOffset(Expr);
231  DwarfExpr->addExpression(Expr);
232  }
233  }
234  if (Loc)
235  addBlock(*VariableDIE, dwarf::DW_AT_location, DwarfExpr->finalize());
236 
237  if (DD->useAllLinkageNames())
238  addLinkageName(*VariableDIE, GV->getLinkageName());
239 
240  if (addToAccelTable) {
241  DD->addAccelName(GV->getName(), *VariableDIE);
242 
243  // If the linkage name is different than the name, go ahead and output
244  // that as well into the name table.
245  if (GV->getLinkageName() != "" && GV->getName() != GV->getLinkageName())
246  DD->addAccelName(GV->getLinkageName(), *VariableDIE);
247  }
248 
249  return VariableDIE;
250 }
251 
253  bool SameAsPrevCU = this == DD->getPrevCU();
254  DD->setPrevCU(this);
255  // If we have no current ranges just add the range and return, otherwise,
256  // check the current section and CU against the previous section and CU we
257  // emitted into and the subprogram was contained within. If these are the
258  // same then extend our current range, otherwise add this as a new range.
259  if (CURanges.empty() || !SameAsPrevCU ||
260  (&CURanges.back().getEnd()->getSection() !=
261  &Range.getEnd()->getSection())) {
262  CURanges.push_back(Range);
263  return;
264  }
265 
266  CURanges.back().setEnd(Range.getEnd());
267 }
268 
270  // Define start line table label for each Compile Unit.
271  MCSymbol *LineTableStartSym =
272  Asm->OutStreamer->getDwarfLineTableSymbol(getUniqueID());
273 
274  // DW_AT_stmt_list is a offset of line number information for this
275  // compile unit in debug_line section. For split dwarf this is
276  // left in the skeleton CU and so not included.
277  // The line table entries are not always emitted in assembly, so it
278  // is not okay to use line_table_start here.
280  StmtListValue =
281  addSectionLabel(getUnitDie(), dwarf::DW_AT_stmt_list, LineTableStartSym,
283 }
284 
286  D.addValue(DIEValueAllocator, *StmtListValue);
287 }
288 
290  const MCSymbol *End) {
291  assert(Begin && "Begin label should not be null!");
292  assert(End && "End label should not be null!");
293  assert(Begin->isDefined() && "Invalid starting label");
294  assert(End->isDefined() && "Invalid end label");
295 
296  addLabelAddress(D, dwarf::DW_AT_low_pc, Begin);
297  if (DD->getDwarfVersion() < 4)
298  addLabelAddress(D, dwarf::DW_AT_high_pc, End);
299  else
300  addLabelDelta(D, dwarf::DW_AT_high_pc, End, Begin);
301 }
302 
303 // Find DIE for the given subprogram and attach appropriate DW_AT_low_pc
304 // and DW_AT_high_pc attributes. If there are global variables in this
305 // scope then create and insert DIEs for these variables.
308 
312  *DD->getCurrentFunction()))
313  addFlag(*SPDie, dwarf::DW_AT_APPLE_omit_frame_ptr);
314 
315  // Only include DW_AT_frame_base in full debug info
318  MachineLocation Location(RI->getFrameRegister(*Asm->MF));
319  if (RI->isPhysicalRegister(Location.getReg()))
320  addAddress(*SPDie, dwarf::DW_AT_frame_base, Location);
321  }
322 
323  // Add name to the name table, we do this here because we're guaranteed
324  // to have concrete versions of our DW_TAG_subprogram nodes.
325  DD->addSubprogramNames(SP, *SPDie);
326 
327  return *SPDie;
328 }
329 
330 // Construct a DIE for this scope.
332  LexicalScope *Scope, SmallVectorImpl<DIE *> &FinalChildren) {
333  if (!Scope || !Scope->getScopeNode())
334  return;
335 
336  auto *DS = Scope->getScopeNode();
337 
338  assert((Scope->getInlinedAt() || !isa<DISubprogram>(DS)) &&
339  "Only handle inlined subprograms here, use "
340  "constructSubprogramScopeDIE for non-inlined "
341  "subprograms");
342 
343  SmallVector<DIE *, 8> Children;
344 
345  // We try to create the scope DIE first, then the children DIEs. This will
346  // avoid creating un-used children then removing them later when we find out
347  // the scope DIE is null.
348  DIE *ScopeDIE;
349  if (Scope->getParent() && isa<DISubprogram>(DS)) {
350  ScopeDIE = constructInlinedScopeDIE(Scope);
351  if (!ScopeDIE)
352  return;
353  // We create children when the scope DIE is not null.
354  createScopeChildrenDIE(Scope, Children);
355  } else {
356  // Early exit when we know the scope DIE is going to be null.
357  if (DD->isLexicalScopeDIENull(Scope))
358  return;
359 
360  bool HasNonScopeChildren = false;
361 
362  // We create children here when we know the scope DIE is not going to be
363  // null and the children will be added to the scope DIE.
364  createScopeChildrenDIE(Scope, Children, &HasNonScopeChildren);
365 
366  // If there are only other scopes as children, put them directly in the
367  // parent instead, as this scope would serve no purpose.
368  if (!HasNonScopeChildren) {
369  FinalChildren.insert(FinalChildren.end(),
370  std::make_move_iterator(Children.begin()),
371  std::make_move_iterator(Children.end()));
372  return;
373  }
374  ScopeDIE = constructLexicalScopeDIE(Scope);
375  assert(ScopeDIE && "Scope DIE should not be null.");
376  }
377 
378  // Add children
379  for (auto &I : Children)
380  ScopeDIE->addChild(std::move(I));
381 
382  FinalChildren.push_back(std::move(ScopeDIE));
383 }
384 
388 
389  // Emit offset in .debug_range as a relocatable label. emitDIE will handle
390  // emitting it appropriately.
391  const MCSymbol *RangeSectionSym =
393 
394  RangeSpanList List(Asm->createTempSymbol("debug_ranges"), std::move(Range));
395 
396  // Under fission, ranges are specified by constant offsets relative to the
397  // CU's DW_AT_GNU_ranges_base.
398  if (isDwoUnit())
399  addSectionDelta(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
400  RangeSectionSym);
401  else
402  addSectionLabel(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
403  RangeSectionSym);
404 
405  // Add the range list to the set of ranges to be emitted.
406  (Skeleton ? Skeleton : this)->CURangeLists.push_back(std::move(List));
407 }
408 
410  DIE &Die, SmallVector<RangeSpan, 2> Ranges) {
411  if (Ranges.size() == 1) {
412  const auto &single = Ranges.front();
413  attachLowHighPC(Die, single.getStart(), single.getEnd());
414  } else
415  addScopeRangeList(Die, std::move(Ranges));
416 }
417 
419  DIE &Die, const SmallVectorImpl<InsnRange> &Ranges) {
421  List.reserve(Ranges.size());
422  for (const InsnRange &R : Ranges)
423  List.push_back(RangeSpan(DD->getLabelBeforeInsn(R.first),
424  DD->getLabelAfterInsn(R.second)));
425  attachRangesOrLowHighPC(Die, std::move(List));
426 }
427 
428 // This scope represents inlined body of a function. Construct DIE to
429 // represent this concrete inlined copy of the function.
431  assert(Scope->getScopeNode());
432  auto *DS = Scope->getScopeNode();
433  auto *InlinedSP = getDISubprogram(DS);
434  // Find the subprogram's DwarfCompileUnit in the SPMap in case the subprogram
435  // was inlined from another compile unit.
436  DIE *OriginDIE = getAbstractSPDies()[InlinedSP];
437  assert(OriginDIE && "Unable to find original DIE for an inlined subprogram.");
438 
439  auto ScopeDIE = DIE::get(DIEValueAllocator, dwarf::DW_TAG_inlined_subroutine);
440  addDIEEntry(*ScopeDIE, dwarf::DW_AT_abstract_origin, *OriginDIE);
441 
442  attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
443 
444  // Add the call site information to the DIE.
445  const DILocation *IA = Scope->getInlinedAt();
446  addUInt(*ScopeDIE, dwarf::DW_AT_call_file, None,
447  getOrCreateSourceID(IA->getFile()));
448  addUInt(*ScopeDIE, dwarf::DW_AT_call_line, None, IA->getLine());
449  if (IA->getDiscriminator() && DD->getDwarfVersion() >= 4)
450  addUInt(*ScopeDIE, dwarf::DW_AT_GNU_discriminator, None,
451  IA->getDiscriminator());
452 
453  // Add name to the name table, we do this here because we're guaranteed
454  // to have concrete versions of our DW_TAG_inlined_subprogram nodes.
455  DD->addSubprogramNames(InlinedSP, *ScopeDIE);
456 
457  return ScopeDIE;
458 }
459 
460 // Construct new DW_TAG_lexical_block for this scope and attach
461 // DW_AT_low_pc/DW_AT_high_pc labels.
463  if (DD->isLexicalScopeDIENull(Scope))
464  return nullptr;
465 
466  auto ScopeDIE = DIE::get(DIEValueAllocator, dwarf::DW_TAG_lexical_block);
467  if (Scope->isAbstractScope())
468  return ScopeDIE;
469 
470  attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
471 
472  return ScopeDIE;
473 }
474 
475 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
477  auto D = constructVariableDIEImpl(DV, Abstract);
478  DV.setDIE(*D);
479  return D;
480 }
481 
482 DIE *DwarfCompileUnit::constructVariableDIEImpl(const DbgVariable &DV,
483  bool Abstract) {
484  // Define variable debug information entry.
485  auto VariableDie = DIE::get(DIEValueAllocator, DV.getTag());
486 
487  if (Abstract) {
488  applyVariableAttributes(DV, *VariableDie);
489  return VariableDie;
490  }
491 
492  // Add variable address.
493 
494  unsigned Offset = DV.getDebugLocListIndex();
495  if (Offset != ~0U) {
496  addLocationList(*VariableDie, dwarf::DW_AT_location, Offset);
497  return VariableDie;
498  }
499 
500  // Check if variable is described by a DBG_VALUE instruction.
501  if (const MachineInstr *DVInsn = DV.getMInsn()) {
502  assert(DVInsn->getNumOperands() == 4);
503  if (DVInsn->getOperand(0).isReg()) {
504  auto RegOp = DVInsn->getOperand(0);
505  auto Op1 = DVInsn->getOperand(1);
506  // If the second operand is an immediate, this is an indirect value.
507  assert((!Op1.isImm() || (Op1.getImm() == 0)) && "unexpected offset");
508  MachineLocation Location(RegOp.getReg(), Op1.isImm());
509  addVariableAddress(DV, *VariableDie, Location);
510  } else if (DVInsn->getOperand(0).isImm()) {
511  // This variable is described by a single constant.
512  // Check whether it has a DIExpression.
513  auto *Expr = DV.getSingleExpression();
514  if (Expr && Expr->getNumElements()) {
515  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
516  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
517  // If there is an expression, emit raw unsigned bytes.
518  DwarfExpr.addFragmentOffset(Expr);
519  DwarfExpr.addUnsignedConstant(DVInsn->getOperand(0).getImm());
520  DwarfExpr.addExpression(Expr);
521  addBlock(*VariableDie, dwarf::DW_AT_location, DwarfExpr.finalize());
522  } else
523  addConstantValue(*VariableDie, DVInsn->getOperand(0), DV.getType());
524  } else if (DVInsn->getOperand(0).isFPImm())
525  addConstantFPValue(*VariableDie, DVInsn->getOperand(0));
526  else if (DVInsn->getOperand(0).isCImm())
527  addConstantValue(*VariableDie, DVInsn->getOperand(0).getCImm(),
528  DV.getType());
529 
530  return VariableDie;
531  }
532 
533  // .. else use frame index.
534  if (!DV.hasFrameIndexExprs())
535  return VariableDie;
536 
537  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
538  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
539  for (auto &Fragment : DV.getFrameIndexExprs()) {
540  unsigned FrameReg = 0;
541  const DIExpression *Expr = Fragment.Expr;
543  int Offset = TFI->getFrameIndexReference(*Asm->MF, Fragment.FI, FrameReg);
544  DwarfExpr.addFragmentOffset(Expr);
546  Ops.push_back(dwarf::DW_OP_plus_uconst);
547  Ops.push_back(Offset);
548  Ops.append(Expr->elements_begin(), Expr->elements_end());
549  DIExpressionCursor Cursor(Ops);
550  DwarfExpr.setMemoryLocationKind();
551  DwarfExpr.addMachineRegExpression(
552  *Asm->MF->getSubtarget().getRegisterInfo(), Cursor, FrameReg);
553  DwarfExpr.addExpression(std::move(Cursor));
554  }
555  addBlock(*VariableDie, dwarf::DW_AT_location, DwarfExpr.finalize());
556 
557  return VariableDie;
558 }
559 
561  const LexicalScope &Scope,
562  DIE *&ObjectPointer) {
563  auto Var = constructVariableDIE(DV, Scope.isAbstractScope());
564  if (DV.isObjectPointer())
565  ObjectPointer = Var;
566  return Var;
567 }
568 
570  SmallVectorImpl<DIE *> &Children,
571  bool *HasNonScopeChildren) {
572  assert(Children.empty());
573  DIE *ObjectPointer = nullptr;
574 
575  for (DbgVariable *DV : DU->getScopeVariables().lookup(Scope))
576  Children.push_back(constructVariableDIE(*DV, *Scope, ObjectPointer));
577 
578  // Skip imported directives in gmlt-like data.
580  // There is no need to emit empty lexical block DIE.
581  for (const auto *IE : ImportedEntities[Scope->getScopeNode()])
582  Children.push_back(
583  constructImportedEntityDIE(cast<DIImportedEntity>(IE)));
584  }
585 
586  if (HasNonScopeChildren)
587  *HasNonScopeChildren = !Children.empty();
588 
589  for (LexicalScope *LS : Scope->getChildren())
590  constructScopeDIE(LS, Children);
591 
592  return ObjectPointer;
593 }
594 
596  DIE &ScopeDIE = updateSubprogramScopeDIE(Sub);
597 
598  if (Scope) {
599  assert(!Scope->getInlinedAt());
600  assert(!Scope->isAbstractScope());
601  // Collect lexical scope children first.
602  // ObjectPointer might be a local (non-argument) local variable if it's a
603  // block's synthetic this pointer.
604  if (DIE *ObjectPointer = createAndAddScopeChildren(Scope, ScopeDIE))
605  addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, *ObjectPointer);
606  }
607 
608  // If this is a variadic function, add an unspecified parameter.
609  DITypeRefArray FnArgs = Sub->getType()->getTypeArray();
610 
611  // If we have a single element of null, it is a function that returns void.
612  // If we have more than one elements and the last one is null, it is a
613  // variadic function.
614  if (FnArgs.size() > 1 && !FnArgs[FnArgs.size() - 1] &&
616  ScopeDIE.addChild(
617  DIE::get(DIEValueAllocator, dwarf::DW_TAG_unspecified_parameters));
618 }
619 
621  DIE &ScopeDIE) {
622  // We create children when the scope DIE is not null.
623  SmallVector<DIE *, 8> Children;
624  DIE *ObjectPointer = createScopeChildrenDIE(Scope, Children);
625 
626  // Add children
627  for (auto &I : Children)
628  ScopeDIE.addChild(std::move(I));
629 
630  return ObjectPointer;
631 }
632 
634  LexicalScope *Scope) {
635  DIE *&AbsDef = getAbstractSPDies()[Scope->getScopeNode()];
636  if (AbsDef)
637  return;
638 
639  auto *SP = cast<DISubprogram>(Scope->getScopeNode());
640 
641  DIE *ContextDIE;
642  DwarfCompileUnit *ContextCU = this;
643 
645  ContextDIE = &getUnitDie();
646  // Some of this is duplicated from DwarfUnit::getOrCreateSubprogramDIE, with
647  // the important distinction that the debug node is not associated with the
648  // DIE (since the debug node will be associated with the concrete DIE, if
649  // any). It could be refactored to some common utility function.
650  else if (auto *SPDecl = SP->getDeclaration()) {
651  ContextDIE = &getUnitDie();
652  getOrCreateSubprogramDIE(SPDecl);
653  } else {
654  ContextDIE = getOrCreateContextDIE(resolve(SP->getScope()));
655  // The scope may be shared with a subprogram that has already been
656  // constructed in another CU, in which case we need to construct this
657  // subprogram in the same CU.
658  ContextCU = DD->lookupCU(ContextDIE->getUnitDie());
659  }
660 
661  // Passing null as the associated node because the abstract definition
662  // shouldn't be found by lookup.
663  AbsDef = &ContextCU->createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, nullptr);
664  ContextCU->applySubprogramAttributesToDefinition(SP, *AbsDef);
665 
666  if (!ContextCU->includeMinimalInlineScopes())
667  ContextCU->addUInt(*AbsDef, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
668  if (DIE *ObjectPointer = ContextCU->createAndAddScopeChildren(Scope, *AbsDef))
669  ContextCU->addDIEEntry(*AbsDef, dwarf::DW_AT_object_pointer, *ObjectPointer);
670 }
671 
673  const DIImportedEntity *Module) {
674  DIE *IMDie = DIE::get(DIEValueAllocator, (dwarf::Tag)Module->getTag());
675  insertDIE(Module, IMDie);
676  DIE *EntityDie;
677  auto *Entity = resolve(Module->getEntity());
678  if (auto *NS = dyn_cast<DINamespace>(Entity))
679  EntityDie = getOrCreateNameSpace(NS);
680  else if (auto *M = dyn_cast<DIModule>(Entity))
681  EntityDie = getOrCreateModule(M);
682  else if (auto *SP = dyn_cast<DISubprogram>(Entity))
683  EntityDie = getOrCreateSubprogramDIE(SP);
684  else if (auto *T = dyn_cast<DIType>(Entity))
685  EntityDie = getOrCreateTypeDIE(T);
686  else if (auto *GV = dyn_cast<DIGlobalVariable>(Entity))
687  EntityDie = getOrCreateGlobalVariableDIE(GV, {});
688  else
689  EntityDie = getDIE(Entity);
690  assert(EntityDie);
691  addSourceLine(*IMDie, Module->getLine(), Module->getFile());
692  addDIEEntry(*IMDie, dwarf::DW_AT_import, *EntityDie);
693  StringRef Name = Module->getName();
694  if (!Name.empty())
695  addString(*IMDie, dwarf::DW_AT_name, Name);
696 
697  return IMDie;
698 }
699 
701  DIE *D = getDIE(SP);
702  if (DIE *AbsSPDIE = getAbstractSPDies().lookup(SP)) {
703  if (D)
704  // If this subprogram has an abstract definition, reference that
705  addDIEEntry(*D, dwarf::DW_AT_abstract_origin, *AbsSPDIE);
706  } else {
708  if (D)
709  // And attach the attributes
711  }
712 }
713 
717  auto *VariableDie = Var.getDIE();
718  if (AbsVar && AbsVar->getDIE()) {
719  addDIEEntry(*VariableDie, dwarf::DW_AT_abstract_origin,
720  *AbsVar->getDIE());
721  } else
722  applyVariableAttributes(Var, *VariableDie);
723 }
724 
726  const DILocalVariable *Cleansed;
727  return getExistingAbstractVariable(IV, Cleansed);
728 }
729 
730 // Find abstract variable, if any, associated with Var.
732  InlinedVariable IV, const DILocalVariable *&Cleansed) {
733  // More then one inlined variable corresponds to one abstract variable.
734  Cleansed = IV.first;
735  auto &AbstractVariables = getAbstractVariables();
736  auto I = AbstractVariables.find(Cleansed);
737  if (I != AbstractVariables.end())
738  return I->second.get();
739  return nullptr;
740 }
741 
743  LexicalScope *Scope) {
744  assert(Scope && Scope->isAbstractScope());
745  auto AbsDbgVariable = llvm::make_unique<DbgVariable>(Var, /* IA */ nullptr);
746  DU->addScopeVariable(Scope, AbsDbgVariable.get());
747  getAbstractVariables()[Var] = std::move(AbsDbgVariable);
748 }
749 
750 void DwarfCompileUnit::emitHeader(bool UseOffsets) {
751  // Don't bother labeling the .dwo unit, as its offset isn't used.
752  if (!Skeleton) {
753  LabelBegin = Asm->createTempSymbol("cu_begin");
754  Asm->OutStreamer->EmitLabel(LabelBegin);
755  }
756 
757  dwarf::UnitType UT = Skeleton ? dwarf::DW_UT_split_compile
758  : DD->useSplitDwarf() ? dwarf::DW_UT_skeleton
759  : dwarf::DW_UT_compile;
760  DwarfUnit::emitCommonHeader(UseOffsets, UT);
761 }
762 
764  // Opting in to GNU Pubnames/types overrides the default to ensure these are
765  // generated for things like Gold's gdb_index generation.
766  if (CUNode->getGnuPubnames())
767  return true;
768 
769  return DD->tuneForGDB() && !includeMinimalInlineScopes();
770 }
771 
772 /// addGlobalName - Add a new global name to the compile unit.
774  const DIScope *Context) {
775  if (!hasDwarfPubSections())
776  return;
777  std::string FullName = getParentContextString(Context) + Name.str();
778  GlobalNames[FullName] = &Die;
779 }
780 
782  const DIScope *Context) {
783  if (!hasDwarfPubSections())
784  return;
785  std::string FullName = getParentContextString(Context) + Name.str();
786  // Insert, allowing the entry to remain as-is if it's already present
787  // This way the CU-level type DIE is preferred over the "can't describe this
788  // type as a unit offset because it's not really in the CU at all, it's only
789  // in a type unit"
790  GlobalNames.insert(std::make_pair(std::move(FullName), &getUnitDie()));
791 }
792 
793 /// Add a new global type to the unit.
794 void DwarfCompileUnit::addGlobalType(const DIType *Ty, const DIE &Die,
795  const DIScope *Context) {
796  if (!hasDwarfPubSections())
797  return;
798  std::string FullName = getParentContextString(Context) + Ty->getName().str();
799  GlobalTypes[FullName] = &Die;
800 }
801 
803  const DIScope *Context) {
804  if (!hasDwarfPubSections())
805  return;
806  std::string FullName = getParentContextString(Context) + Ty->getName().str();
807  // Insert, allowing the entry to remain as-is if it's already present
808  // This way the CU-level type DIE is preferred over the "can't describe this
809  // type as a unit offset because it's not really in the CU at all, it's only
810  // in a type unit"
811  GlobalTypes.insert(std::make_pair(std::move(FullName), &getUnitDie()));
812 }
813 
814 /// addVariableAddress - Add DW_AT_location attribute for a
815 /// DbgVariable based on provided MachineLocation.
817  MachineLocation Location) {
818  // addBlockByrefAddress is obsolete and will be removed soon.
819  // The clang frontend always generates block byref variables with a
820  // complex expression that encodes exactly what addBlockByrefAddress
821  // would do.
823  "block byref variable without a complex expression");
824  if (DV.hasComplexAddress())
825  addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
826  else if (DV.isBlockByrefVariable())
827  addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
828  else
829  addAddress(Die, dwarf::DW_AT_location, Location);
830 }
831 
832 /// Add an address attribute to a die based on the location provided.
834  const MachineLocation &Location) {
835  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
836  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
837  if (Location.isIndirect())
838  DwarfExpr.setMemoryLocationKind();
839 
840  DIExpressionCursor Cursor({});
842  if (!DwarfExpr.addMachineRegExpression(TRI, Cursor, Location.getReg()))
843  return;
844  DwarfExpr.addExpression(std::move(Cursor));
845 
846  // Now attach the location information to the DIE.
847  addBlock(Die, Attribute, DwarfExpr.finalize());
848 }
849 
850 /// Start with the address based on the location provided, and generate the
851 /// DWARF information necessary to find the actual variable given the extra
852 /// address information encoded in the DbgVariable, starting from the starting
853 /// location. Add the DWARF information to the die.
856  const MachineLocation &Location) {
857  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
858  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
859  const DIExpression *DIExpr = DV.getSingleExpression();
860  DwarfExpr.addFragmentOffset(DIExpr);
861  if (Location.isIndirect())
862  DwarfExpr.setMemoryLocationKind();
863 
864  DIExpressionCursor Cursor(DIExpr);
866  if (!DwarfExpr.addMachineRegExpression(TRI, Cursor, Location.getReg()))
867  return;
868  DwarfExpr.addExpression(std::move(Cursor));
869 
870  // Now attach the location information to the DIE.
871  addBlock(Die, Attribute, DwarfExpr.finalize());
872 }
873 
874 /// Add a Dwarf loclistptr attribute data and value.
876  unsigned Index) {
877  dwarf::Form Form = DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
878  : dwarf::DW_FORM_data4;
879  Die.addValue(DIEValueAllocator, Attribute, Form, DIELocList(Index));
880 }
881 
883  DIE &VariableDie) {
884  StringRef Name = Var.getName();
885  if (!Name.empty())
886  addString(VariableDie, dwarf::DW_AT_name, Name);
887  const auto *DIVar = Var.getVariable();
888  if (DIVar)
889  if (uint32_t AlignInBytes = DIVar->getAlignInBytes())
890  addUInt(VariableDie, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
891  AlignInBytes);
892 
893  addSourceLine(VariableDie, DIVar);
894  addType(VariableDie, Var.getType());
895  if (Var.isArtificial())
896  addFlag(VariableDie, dwarf::DW_AT_artificial);
897 }
898 
899 /// Add a Dwarf expression attribute data and value.
901  const MCExpr *Expr) {
902  Die.addValue(DIEValueAllocator, (dwarf::Attribute)0, Form, DIEExpr(Expr));
903 }
904 
906  const DISubprogram *SP, DIE &SPDie) {
907  auto *SPDecl = SP->getDeclaration();
908  auto *Context = resolve(SPDecl ? SPDecl->getScope() : SP->getScope());
910  addGlobalName(SP->getName(), SPDie, Context);
911 }
912 
913 bool DwarfCompileUnit::isDwoUnit() const {
914  return DD->useSplitDwarf() && Skeleton;
915 }
916 
919  (DD->useSplitDwarf() && !Skeleton);
920 }
const DICompileUnit * getCUNode() const
Definition: DwarfUnit.h:113
const TargetLoweringObjectFile & getObjFileLowering() const
Return information about object file lowering.
Definition: AsmPrinter.cpp:208
const DILocation * getInlinedAt() const
Definition: DwarfDebug.h:125
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:1613
const DILocalScope * getScopeNode() const
Definition: LexicalScopes.h:64
bool isConstant() const
Determine whether this represents a standalone constant value.
void addFlag(DIE &Die, dwarf::Attribute Attribute)
Add a flag that is true to the DIE.
Definition: DwarfUnit.cpp:207
LLVM_NODISCARD std::string str() const
str - Get the contents as an std::string.
Definition: StringRef.h:228
LLVMContext & Context
unsigned getDebugLocListIndex() const
Definition: DwarfDebug.h:135
void addLabelDelta(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Hi, const MCSymbol *Lo)
Add a label delta attribute data and value.
Definition: DwarfUnit.cpp:300
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:92
DIELoc - Represents an expression location.
Definition: DIE.h:846
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
bool isAbstractScope() const
Definition: LexicalScopes.h:65
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:1519
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:42
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:63
unsigned size() const
LLVM_ATTRIBUTE_ALWAYS_INLINE size_type size() const
Definition: SmallVector.h:136
void setMemoryLocationKind()
Lock this down to become a memory location description.
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.
const DIType * getType() const
Definition: DwarfDebug.cpp:164
DIE * getDIE() const
Definition: DwarfDebug.h:133
Attribute
Attributes.
Definition: Dwarf.h:107
void insertDIE(const DINode *Desc, DIE *D)
Insert DIE into the map.
Definition: DwarfUnit.cpp:199
unsigned getReg() const
Collects and handles dwarf debug information.
Definition: DwarfDebug.h:196
const MachineFunction * MF
The current machine function.
Definition: AsmPrinter.h:95
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:475
DbgValueHistoryMap::InlinedVariable InlinedVariable
Find abstract variable associated with Var.
void createAbstractVariable(const DILocalVariable *DV, LexicalScope *Scope)
SmallVectorImpl< InsnRange > & getRanges()
Definition: LexicalScopes.h:67
void addRange(RangeSpan Range)
addRange - Add an address range to the list of ranges for this unit.
DenseMap< LexicalScope *, SmallVector< DbgVariable *, 8 > > & getScopeVariables()
Definition: DwarfFile.h:97
bool hasDLLImportStorageClass() const
Definition: GlobalValue.h:254
void attachLowHighPC(DIE &D, const MCSymbol *Begin, const MCSymbol *End)
void reserve(size_type N)
Definition: SmallVector.h:378
Represents a pointer to a location list in the debug_loc section.
Definition: DIE.h:312
LexicalScope - This class is used to track scope information.
Definition: LexicalScopes.h:45
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:778
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:1622
const MachineFunction * getCurrentFunction() const
Definition: DwarfDebug.h:532
StringRef getName() const
AsmPrinter * Asm
Target of Dwarf emission.
Definition: DwarfUnit.h:77
DIE * getOrCreateTypeDIE(const MDNode *N)
Find existing DIE or create new DIE for the given type.
Definition: DwarfUnit.cpp:713
bool useSplitDwarf() const
Returns whether or not to change the current debug info for the split dwarf proposal support...
Definition: DwarfDebug.h:493
DIE * getDIE(const DINode *D) const
Returns the DIE map slot for the specified debug variable.
Definition: DwarfUnit.cpp:193
T * resolve(TypedDINodeRef< T > Ref) const
Look in the DwarfDebug map for the MDNode that corresponds to the reference.
Definition: DwarfUnit.h:318
void addBlock(DIE &Die, dwarf::Attribute Attribute, DIELoc *Block)
Add block data.
Definition: DwarfUnit.cpp:342
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:461
StringRef getName() const
SmallVectorImpl< LexicalScope * > & getChildren()
Definition: LexicalScopes.h:66
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:61
const TargetMachine & getTarget() const
getTarget - Return the target machine this machine code is compiled with
bool isObjectPointer() const
Definition: DwarfDebug.h:161
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: APFloat.h:42
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:36
void addConstantFPValue(DIE &Die, const MachineOperand &MO)
Add constant value entry in variable DIE.
Definition: DwarfUnit.cpp:578
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.
bool isLexicalScopeDIENull(LexicalScope *Scope)
A helper function to check whether the DIE for a given Scope is going to be null. ...
Definition: DwarfDebug.cpp:386
virtual unsigned getFrameRegister(const MachineFunction &MF) const =0
Debug information queries.
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:44
static const uint16_t * lookup(unsigned opcode, unsigned domain, ArrayRef< uint16_t[3]> Table)
StringRef getFilename() const
void addString(DIE &Die, dwarf::Attribute Attribute, StringRef Str)
Add a string attribute data and value.
Definition: DwarfUnit.cpp:242
DIE * constructInlinedScopeDIE(LexicalScope *Scope)
This scope represents inlined body of a function.
AddressPool & getAddressPool()
Definition: DwarfDebug.h:522
Subprogram description.
unsigned getUniqueID() const
const DIExpression * getSingleExpression() const
Definition: DwarfDebug.h:127
MCSymbol * getFunctionBegin() const
Definition: AsmPrinter.h:194
This class is used to track local variable information.
Definition: DwarfDebug.h:76
bool DisableFramePointerElim(const MachineFunction &MF) const
DisableFramePointerElim - This returns true if frame pointer elimination optimization should be disab...
const DILocalVariable * getVariable() const
Definition: DwarfDebug.h:124
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:133
DIE * constructVariableDIE(DbgVariable &DV, bool Abstract=false)
constructVariableDIE - Construct a DIE for the given DbgVariable.
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory)...
Definition: APInt.h:33
void addGlobalNameForTypeUnit(StringRef Name, const DIScope *Context)
Add a new global name present in a type unit to this compile unit.
const MachineInstr * getMInsn() const
Definition: DwarfDebug.h:137
DIE * getOrCreateNameSpace(const DINamespace *NS)
Definition: DwarfUnit.cpp:1092
Debug location.
DIE & addChild(DIE *Child)
Add a child to the DIE.
Definition: DIE.h:769
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:501
bool hasComplexAddress() const
Definition: DwarfDebug.h:169
void addConstantValue(DIE &Die, const MachineOperand &MO, const DIType *Ty)
Add constant value entry in variable DIE.
Definition: DwarfUnit.cpp:610
static DIE * get(BumpPtrAllocator &Alloc, dwarf::Tag Tag)
Definition: DIE.h:692
void applySubprogramAttributes(const DISubprogram *SP, DIE &SPDie, bool SkipSPAttributes=false)
Definition: DwarfUnit.cpp:1211
void addSourceLine(DIE &Die, unsigned Line, const DIFile *File)
Add location information to specified debug information entry.
Definition: DwarfUnit.cpp:356
This dwarf writer support class manages information associated with a source file.
Definition: DwarfUnit.h:68
void addLocationList(DIE &Die, dwarf::Attribute Attribute, unsigned Index)
Add a Dwarf loclistptr attribute data and value.
const TargetSubtargetInfo & getSubtarget() const
getSubtarget - Return the subtarget for which this machine code is being compiled.
void constructSubprogramScopeDIE(const DISubprogram *Sub, LexicalScope *Scope)
Construct a DIE for this subprogram scope.
const DILocation * getInlinedAt() const
Definition: LexicalScopes.h:63
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:605
void setDIE(DIE &D)
Definition: DwarfDebug.h:132
MD5::MD5Result * getMD5AsBytes(const DIFile *File)
If the File has an MD5 checksum, return it as an MD5Result allocated in the MCContext.
Definition: DwarfUnit.cpp:268
A structured debug information entry.
Definition: DIE.h:662
DIE & getUnitDie()
Definition: DIE.h:834
TargetMachine & TM
Target machine description.
Definition: AsmPrinter.h:80
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:77
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.
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:1566
static const unsigned End
void addAddress(DIE &Die, dwarf::Attribute Attribute, const MachineLocation &Location)
Add an address attribute to a die based on the location provided.
A label DIE.
Definition: DIE.h:218
DIE * getOrCreateSubprogramDIE(const DISubprogram *SP, bool Minimal=false)
Definition: DwarfUnit.cpp:1137
bool hasFrameIndexExprs() const
Definition: DwarfDebug.h:140
DIE * createAndAddScopeChildren(LexicalScope *Scope, DIE &ScopeDIE)
bool addScopeVariable(LexicalScope *LS, DbgVariable *Var)
Definition: DwarfFile.cpp:84
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:144
T * resolve(TypedDINodeRef< T > Ref) const
Find the MDNode for the given reference.
Definition: DwarfDebug.h:516
Helper used to pair up a symbol and its DWARF compile unit.
Definition: DwarfDebug.h:188
StringRef getDirectory() const
bool useAllLinkageNames() const
Returns whether we should emit all DW_AT_[MIPS_]linkage_name.
Definition: DwarfDebug.h:471
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
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
ArrayRef< FrameIndexExpr > getFrameIndexExprs() const
Get the FI entries, sorted by fragment offset.
Definition: DwarfDebug.cpp:209
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:784
UnitType
Constants for unit types in DWARF v5.
Definition: Dwarf.h:321
void addExpression(DIExpressionCursor &&Expr, unsigned FragmentOffsetInBits=0)
Emit all remaining operations in the DIExpressionCursor.
bool tuneForGDB() const
Definition: DwarfDebug.h:545
void constructAbstractSubprogramScopeDIE(LexicalScope *Scope)
void setPrevCU(const DwarfCompileUnit *PrevCU)
Definition: DwarfDebug.h:502
Base class for types.
static Optional< DebugEmissionKind > getEmissionKind(StringRef Str)
StringRef getName() const
MCSymbol * getSymbol(const GlobalValue *GV) const
Definition: AsmPrinter.cpp:423
DwarfCompileUnit * lookupCU(const DIE *Die)
Find the matching DwarfCompileUnit for the given CU DIE.
Definition: DwarfDebug.h:539
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:862
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:657
void applySubprogramAttributesToDefinition(const DISubprogram *SP, DIE &SPDie)
MCSymbol * getBeginSymbol()
Definition: MCSection.h:106
void finishSubprogramDefinition(const DISubprogram *SP)
static GCRegistry::Add< StatepointGC > D("statepoint-example", "an example strategy for statepoint")
bool useAppleExtensionAttributes() const
Definition: DwarfDebug.h:487
void addAccelName(StringRef Name, const DIE &Die)
MCSymbol * getFunctionEnd() const
Definition: AsmPrinter.h:195
StringRef getDisplayName() const
DWARF expression.
StringRef getLinkageName() const
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:248
DwarfDebug * DD
Definition: DwarfUnit.h:80
StringRef getName() const
Definition: DwarfDebug.h:136
unsigned EmulatedTLS
EmulatedTLS - This flag enables emulated TLS model, using emutls function in the runtime library...
MCSection & getSection() const
Get the section associated with a defined, non-absolute symbol.
Definition: MCSymbol.h:267
void addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIE &Entry)
Add a DIE attribute data and value.
Definition: DwarfUnit.cpp:306
iterator insert(iterator I, T &&Elt)
Definition: SmallVector.h:480
void append(in_iter in_start, in_iter in_end)
Add the specified range to the end of the SmallVector.
Definition: SmallVector.h:396
DIE * getOrCreateContextDIE(const DIScope *Context)
Get context owner&#39;s DIE.
Definition: DwarfUnit.cpp:683
Representation of each machine instruction.
Definition: MachineInstr.h:60
An integer value DIE.
Definition: DIE.h:163
static bool isPhysicalRegister(unsigned Reg)
Return true if the specified register number is in the physical register namespace.
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator end()
Definition: SmallVector.h:120
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:335
LLVM_NODISCARD bool empty() const
Definition: SmallVector.h:61
bool isBlockByrefVariable() const
Definition: DwarfDebug.cpp:159
void addVariableAddress(const DbgVariable &DV, DIE &Die, MachineLocation Location)
Add DW_AT_location attribute for a DbgVariable based on provided MachineLocation. ...
TargetOptions Options
Definition: TargetMachine.h:98
const NodeList & List
Definition: RDFGraph.cpp:210
#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)
element_iterator elements_begin() const
DIE * getOrCreateModule(const DIModule *M)
Definition: DwarfUnit.cpp:1113
void addBlockByrefAddress(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...
Definition: DwarfUnit.cpp:450
bool includeMinimalInlineScopes() const
const DICompileUnit * CUNode
MDNode for the compile unit.
Definition: DwarfUnit.h:71
DwarfExpression implementation for singular DW_AT_location.
void addSubprogramNames(const DISubprogram *SP, DIE &Die)
Definition: DwarfDebug.cpp:361
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...
DITypeRef getType() const
MCSymbol * getLabelBeforeInsn(const MachineInstr *MI)
Return Label preceding the instruction.
BumpPtrAllocator DIEValueAllocator
Definition: DwarfUnit.h:74
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
const MCSymbol * getEnd() const
Definition: DwarfUnit.h:43
uint32_t getAlignInBytes() const
void finishVariableDefinition(const DbgVariable &Var)
DINodeRef getEntity() 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...
DbgVariable * getExistingAbstractVariable(InlinedVariable IV, const DILocalVariable *&Cleansed)
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:216
const DataLayout & getDataLayout() const
Return information about data layout.
Definition: AsmPrinter.cpp:212
bool isThreadLocal() const
If the value is "Thread Local", its value isn&#39;t shared by the threads.
Definition: GlobalValue.h:239
void addOpAddress(DIELoc &Die, const MCSymbol *Label)
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:289
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
MCSection * getDwarfRangesSection() const
DwarfFile * DU
Definition: DwarfUnit.h:81
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...
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:153
value_iterator addValue(BumpPtrAllocator &Alloc, const DIEValue &V)
Definition: DIE.h:640
std::pair< const MachineInstr *, const MachineInstr * > InsnRange
InsnRange - This is used to track range of instructions with identical lexical scope.
Definition: LexicalScopes.h:40
DIE * constructLexicalScopeDIE(LexicalScope *Scope)
Construct new DW_TAG_lexical_block for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels...
DIScopeRef getScope() const
unsigned getIndex(const MCSymbol *Sym, bool TLS=false)
Returns the index into the address pool with the given label/symbol.
Definition: AddressPool.cpp:20