LLVM  6.0.0svn
DwarfCompileUnit.cpp
Go to the documentation of this file.
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  StringRef DirName) {
99  // If we print assembly, we can't separate .file entries according to
100  // compile units. Thus all files will belong to the default compile unit.
101 
102  // FIXME: add a better feature test than hasRawTextSupport. Even better,
103  // extend .file to support this.
104  return Asm->OutStreamer->EmitDwarfFileDirective(
105  0, DirName, FileName,
106  Asm->OutStreamer->hasRawTextSupport() ? 0 : getUniqueID());
107 }
108 
110  const DIGlobalVariable *GV, ArrayRef<GlobalExpr> GlobalExprs) {
111  // Check for pre-existence.
112  if (DIE *Die = getDIE(GV))
113  return Die;
114 
115  assert(GV);
116 
117  auto *GVContext = GV->getScope();
118  auto *GTy = DD->resolve(GV->getType());
119 
120  // Construct the context before querying for the existence of the DIE in
121  // case such construction creates the DIE.
122  DIE *ContextDIE = getOrCreateContextDIE(GVContext);
123 
124  // Add to map.
125  DIE *VariableDIE = &createAndAddDIE(GV->getTag(), *ContextDIE, GV);
126  DIScope *DeclContext;
127  if (auto *SDMDecl = GV->getStaticDataMemberDeclaration()) {
128  DeclContext = resolve(SDMDecl->getScope());
129  assert(SDMDecl->isStaticMember() && "Expected static member decl");
130  assert(GV->isDefinition());
131  // We need the declaration DIE that is in the static member's class.
132  DIE *VariableSpecDIE = getOrCreateStaticMemberDIE(SDMDecl);
133  addDIEEntry(*VariableDIE, dwarf::DW_AT_specification, *VariableSpecDIE);
134  // If the global variable's type is different from the one in the class
135  // member type, assume that it's more specific and also emit it.
136  if (GTy != DD->resolve(SDMDecl->getBaseType()))
137  addType(*VariableDIE, GTy);
138  } else {
139  DeclContext = GV->getScope();
140  // Add name and type.
141  addString(*VariableDIE, dwarf::DW_AT_name, GV->getDisplayName());
142  addType(*VariableDIE, GTy);
143 
144  // Add scoping info.
145  if (!GV->isLocalToUnit())
146  addFlag(*VariableDIE, dwarf::DW_AT_external);
147 
148  // Add line number info.
149  addSourceLine(*VariableDIE, GV);
150  }
151 
152  if (!GV->isDefinition())
153  addFlag(*VariableDIE, dwarf::DW_AT_declaration);
154  else
155  addGlobalName(GV->getName(), *VariableDIE, DeclContext);
156 
157  if (uint32_t AlignInBytes = GV->getAlignInBytes())
158  addUInt(*VariableDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
159  AlignInBytes);
160 
161  // Add location.
162  bool addToAccelTable = false;
163  DIELoc *Loc = nullptr;
164  std::unique_ptr<DIEDwarfExpression> DwarfExpr;
165  for (const auto &GE : GlobalExprs) {
166  const GlobalVariable *Global = GE.Var;
167  const DIExpression *Expr = GE.Expr;
168 
169  // For compatibility with DWARF 3 and earlier,
170  // DW_AT_location(DW_OP_constu, X, DW_OP_stack_value) becomes
171  // DW_AT_const_value(X).
172  if (GlobalExprs.size() == 1 && Expr && Expr->isConstant()) {
173  addToAccelTable = true;
174  addConstantValue(*VariableDIE, /*Unsigned=*/true, Expr->getElement(1));
175  break;
176  }
177 
178  // We cannot describe the location of dllimport'd variables: the
179  // computation of their address requires loads from the IAT.
180  if (Global && Global->hasDLLImportStorageClass())
181  continue;
182 
183  // Nothing to describe without address or constant.
184  if (!Global && (!Expr || !Expr->isConstant()))
185  continue;
186 
187  if (!Loc) {
188  addToAccelTable = true;
189  Loc = new (DIEValueAllocator) DIELoc;
190  DwarfExpr = llvm::make_unique<DIEDwarfExpression>(*Asm, *this, *Loc);
191  }
192 
193  if (Global) {
194  const MCSymbol *Sym = Asm->getSymbol(Global);
195  if (Global->isThreadLocal()) {
196  if (Asm->TM.Options.EmulatedTLS) {
197  // TODO: add debug info for emulated thread local mode.
198  } else {
199  // FIXME: Make this work with -gsplit-dwarf.
200  unsigned PointerSize = Asm->getDataLayout().getPointerSize();
201  assert((PointerSize == 4 || PointerSize == 8) &&
202  "Add support for other sizes if necessary");
203  // Based on GCC's support for TLS:
204  if (!DD->useSplitDwarf()) {
205  // 1) Start with a constNu of the appropriate pointer size
206  addUInt(*Loc, dwarf::DW_FORM_data1,
207  PointerSize == 4 ? dwarf::DW_OP_const4u
208  : dwarf::DW_OP_const8u);
209  // 2) containing the (relocated) offset of the TLS variable
210  // within the module's TLS block.
211  addExpr(*Loc, dwarf::DW_FORM_udata,
213  } else {
214  addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
215  addUInt(*Loc, dwarf::DW_FORM_udata,
216  DD->getAddressPool().getIndex(Sym, /* TLS */ true));
217  }
218  // 3) followed by an OP to make the debugger do a TLS lookup.
219  addUInt(*Loc, dwarf::DW_FORM_data1,
220  DD->useGNUTLSOpcode() ? dwarf::DW_OP_GNU_push_tls_address
221  : dwarf::DW_OP_form_tls_address);
222  }
223  } else {
224  DD->addArangeLabel(SymbolCU(this, Sym));
225  addOpAddress(*Loc, Sym);
226  }
227  }
228  if (Expr) {
229  DwarfExpr->addFragmentOffset(Expr);
230  DwarfExpr->addExpression(Expr);
231  }
232  }
233  if (Loc)
234  addBlock(*VariableDIE, dwarf::DW_AT_location, DwarfExpr->finalize());
235 
236  if (DD->useAllLinkageNames())
237  addLinkageName(*VariableDIE, GV->getLinkageName());
238 
239  if (addToAccelTable) {
240  DD->addAccelName(GV->getName(), *VariableDIE);
241 
242  // If the linkage name is different than the name, go ahead and output
243  // that as well into the name table.
244  if (GV->getLinkageName() != "" && GV->getName() != GV->getLinkageName())
245  DD->addAccelName(GV->getLinkageName(), *VariableDIE);
246  }
247 
248  return VariableDIE;
249 }
250 
252  bool SameAsPrevCU = this == DD->getPrevCU();
253  DD->setPrevCU(this);
254  // If we have no current ranges just add the range and return, otherwise,
255  // check the current section and CU against the previous section and CU we
256  // emitted into and the subprogram was contained within. If these are the
257  // same then extend our current range, otherwise add this as a new range.
258  if (CURanges.empty() || !SameAsPrevCU ||
259  (&CURanges.back().getEnd()->getSection() !=
260  &Range.getEnd()->getSection())) {
261  CURanges.push_back(Range);
262  return;
263  }
264 
265  CURanges.back().setEnd(Range.getEnd());
266 }
267 
269  // Define start line table label for each Compile Unit.
270  MCSymbol *LineTableStartSym =
271  Asm->OutStreamer->getDwarfLineTableSymbol(getUniqueID());
272 
273  // DW_AT_stmt_list is a offset of line number information for this
274  // compile unit in debug_line section. For split dwarf this is
275  // left in the skeleton CU and so not included.
276  // The line table entries are not always emitted in assembly, so it
277  // is not okay to use line_table_start here.
279  StmtListValue =
280  addSectionLabel(getUnitDie(), dwarf::DW_AT_stmt_list, LineTableStartSym,
282 }
283 
285  D.addValue(DIEValueAllocator, *StmtListValue);
286 }
287 
289  const MCSymbol *End) {
290  assert(Begin && "Begin label should not be null!");
291  assert(End && "End label should not be null!");
292  assert(Begin->isDefined() && "Invalid starting label");
293  assert(End->isDefined() && "Invalid end label");
294 
295  addLabelAddress(D, dwarf::DW_AT_low_pc, Begin);
296  if (DD->getDwarfVersion() < 4)
297  addLabelAddress(D, dwarf::DW_AT_high_pc, End);
298  else
299  addLabelDelta(D, dwarf::DW_AT_high_pc, End, Begin);
300 }
301 
302 // Find DIE for the given subprogram and attach appropriate DW_AT_low_pc
303 // and DW_AT_high_pc attributes. If there are global variables in this
304 // scope then create and insert DIEs for these variables.
307 
311  *DD->getCurrentFunction()))
312  addFlag(*SPDie, dwarf::DW_AT_APPLE_omit_frame_ptr);
313 
314  // Only include DW_AT_frame_base in full debug info
317  MachineLocation Location(RI->getFrameRegister(*Asm->MF));
318  if (RI->isPhysicalRegister(Location.getReg()))
319  addAddress(*SPDie, dwarf::DW_AT_frame_base, Location);
320  }
321 
322  // Add name to the name table, we do this here because we're guaranteed
323  // to have concrete versions of our DW_TAG_subprogram nodes.
324  DD->addSubprogramNames(SP, *SPDie);
325 
326  return *SPDie;
327 }
328 
329 // Construct a DIE for this scope.
331  LexicalScope *Scope, SmallVectorImpl<DIE *> &FinalChildren) {
332  if (!Scope || !Scope->getScopeNode())
333  return;
334 
335  auto *DS = Scope->getScopeNode();
336 
337  assert((Scope->getInlinedAt() || !isa<DISubprogram>(DS)) &&
338  "Only handle inlined subprograms here, use "
339  "constructSubprogramScopeDIE for non-inlined "
340  "subprograms");
341 
342  SmallVector<DIE *, 8> Children;
343 
344  // We try to create the scope DIE first, then the children DIEs. This will
345  // avoid creating un-used children then removing them later when we find out
346  // the scope DIE is null.
347  DIE *ScopeDIE;
348  if (Scope->getParent() && isa<DISubprogram>(DS)) {
349  ScopeDIE = constructInlinedScopeDIE(Scope);
350  if (!ScopeDIE)
351  return;
352  // We create children when the scope DIE is not null.
353  createScopeChildrenDIE(Scope, Children);
354  } else {
355  // Early exit when we know the scope DIE is going to be null.
356  if (DD->isLexicalScopeDIENull(Scope))
357  return;
358 
359  bool HasNonScopeChildren = false;
360 
361  // We create children here when we know the scope DIE is not going to be
362  // null and the children will be added to the scope DIE.
363  createScopeChildrenDIE(Scope, Children, &HasNonScopeChildren);
364 
365  // If there are only other scopes as children, put them directly in the
366  // parent instead, as this scope would serve no purpose.
367  if (!HasNonScopeChildren) {
368  FinalChildren.insert(FinalChildren.end(),
369  std::make_move_iterator(Children.begin()),
370  std::make_move_iterator(Children.end()));
371  return;
372  }
373  ScopeDIE = constructLexicalScopeDIE(Scope);
374  assert(ScopeDIE && "Scope DIE should not be null.");
375  }
376 
377  // Add children
378  for (auto &I : Children)
379  ScopeDIE->addChild(std::move(I));
380 
381  FinalChildren.push_back(std::move(ScopeDIE));
382 }
383 
387 
388  // Emit offset in .debug_range as a relocatable label. emitDIE will handle
389  // emitting it appropriately.
390  const MCSymbol *RangeSectionSym =
392 
393  RangeSpanList List(Asm->createTempSymbol("debug_ranges"), std::move(Range));
394 
395  // Under fission, ranges are specified by constant offsets relative to the
396  // CU's DW_AT_GNU_ranges_base.
397  if (isDwoUnit())
398  addSectionDelta(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
399  RangeSectionSym);
400  else
401  addSectionLabel(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
402  RangeSectionSym);
403 
404  // Add the range list to the set of ranges to be emitted.
405  (Skeleton ? Skeleton : this)->CURangeLists.push_back(std::move(List));
406 }
407 
409  DIE &Die, SmallVector<RangeSpan, 2> Ranges) {
410  if (Ranges.size() == 1) {
411  const auto &single = Ranges.front();
412  attachLowHighPC(Die, single.getStart(), single.getEnd());
413  } else
414  addScopeRangeList(Die, std::move(Ranges));
415 }
416 
418  DIE &Die, const SmallVectorImpl<InsnRange> &Ranges) {
420  List.reserve(Ranges.size());
421  for (const InsnRange &R : Ranges)
422  List.push_back(RangeSpan(DD->getLabelBeforeInsn(R.first),
423  DD->getLabelAfterInsn(R.second)));
424  attachRangesOrLowHighPC(Die, std::move(List));
425 }
426 
427 // This scope represents inlined body of a function. Construct DIE to
428 // represent this concrete inlined copy of the function.
430  assert(Scope->getScopeNode());
431  auto *DS = Scope->getScopeNode();
432  auto *InlinedSP = getDISubprogram(DS);
433  // Find the subprogram's DwarfCompileUnit in the SPMap in case the subprogram
434  // was inlined from another compile unit.
435  DIE *OriginDIE = getAbstractSPDies()[InlinedSP];
436  assert(OriginDIE && "Unable to find original DIE for an inlined subprogram.");
437 
438  auto ScopeDIE = DIE::get(DIEValueAllocator, dwarf::DW_TAG_inlined_subroutine);
439  addDIEEntry(*ScopeDIE, dwarf::DW_AT_abstract_origin, *OriginDIE);
440 
441  attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
442 
443  // Add the call site information to the DIE.
444  const DILocation *IA = Scope->getInlinedAt();
445  addUInt(*ScopeDIE, dwarf::DW_AT_call_file, None,
446  getOrCreateSourceID(IA->getFilename(), IA->getDirectory()));
447  addUInt(*ScopeDIE, dwarf::DW_AT_call_line, None, IA->getLine());
448  if (IA->getDiscriminator() && DD->getDwarfVersion() >= 4)
449  addUInt(*ScopeDIE, dwarf::DW_AT_GNU_discriminator, None,
450  IA->getDiscriminator());
451 
452  // Add name to the name table, we do this here because we're guaranteed
453  // to have concrete versions of our DW_TAG_inlined_subprogram nodes.
454  DD->addSubprogramNames(InlinedSP, *ScopeDIE);
455 
456  return ScopeDIE;
457 }
458 
459 // Construct new DW_TAG_lexical_block for this scope and attach
460 // DW_AT_low_pc/DW_AT_high_pc labels.
462  if (DD->isLexicalScopeDIENull(Scope))
463  return nullptr;
464 
465  auto ScopeDIE = DIE::get(DIEValueAllocator, dwarf::DW_TAG_lexical_block);
466  if (Scope->isAbstractScope())
467  return ScopeDIE;
468 
469  attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
470 
471  return ScopeDIE;
472 }
473 
474 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
476  auto D = constructVariableDIEImpl(DV, Abstract);
477  DV.setDIE(*D);
478  return D;
479 }
480 
481 DIE *DwarfCompileUnit::constructVariableDIEImpl(const DbgVariable &DV,
482  bool Abstract) {
483  // Define variable debug information entry.
484  auto VariableDie = DIE::get(DIEValueAllocator, DV.getTag());
485 
486  if (Abstract) {
487  applyVariableAttributes(DV, *VariableDie);
488  return VariableDie;
489  }
490 
491  // Add variable address.
492 
493  unsigned Offset = DV.getDebugLocListIndex();
494  if (Offset != ~0U) {
495  addLocationList(*VariableDie, dwarf::DW_AT_location, Offset);
496  return VariableDie;
497  }
498 
499  // Check if variable is described by a DBG_VALUE instruction.
500  if (const MachineInstr *DVInsn = DV.getMInsn()) {
501  assert(DVInsn->getNumOperands() == 4);
502  if (DVInsn->getOperand(0).isReg()) {
503  auto RegOp = DVInsn->getOperand(0);
504  auto Op1 = DVInsn->getOperand(1);
505  // If the second operand is an immediate, this is an indirect value.
506  assert((!Op1.isImm() || (Op1.getImm() == 0)) && "unexpected offset");
507  MachineLocation Location(RegOp.getReg(), Op1.isImm());
508  addVariableAddress(DV, *VariableDie, Location);
509  } else if (DVInsn->getOperand(0).isImm()) {
510  // This variable is described by a single constant.
511  // Check whether it has a DIExpression.
512  auto *Expr = DV.getSingleExpression();
513  if (Expr && Expr->getNumElements()) {
514  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
515  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
516  // If there is an expression, emit raw unsigned bytes.
517  DwarfExpr.addFragmentOffset(Expr);
518  DwarfExpr.addUnsignedConstant(DVInsn->getOperand(0).getImm());
519  DwarfExpr.addExpression(Expr);
520  addBlock(*VariableDie, dwarf::DW_AT_location, DwarfExpr.finalize());
521  } else
522  addConstantValue(*VariableDie, DVInsn->getOperand(0), DV.getType());
523  } else if (DVInsn->getOperand(0).isFPImm())
524  addConstantFPValue(*VariableDie, DVInsn->getOperand(0));
525  else if (DVInsn->getOperand(0).isCImm())
526  addConstantValue(*VariableDie, DVInsn->getOperand(0).getCImm(),
527  DV.getType());
528 
529  return VariableDie;
530  }
531 
532  // .. else use frame index.
533  if (!DV.hasFrameIndexExprs())
534  return VariableDie;
535 
536  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
537  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
538  for (auto &Fragment : DV.getFrameIndexExprs()) {
539  unsigned FrameReg = 0;
540  const DIExpression *Expr = Fragment.Expr;
542  int Offset = TFI->getFrameIndexReference(*Asm->MF, Fragment.FI, FrameReg);
543  DwarfExpr.addFragmentOffset(Expr);
545  Ops.push_back(dwarf::DW_OP_plus_uconst);
546  Ops.push_back(Offset);
547  Ops.append(Expr->elements_begin(), Expr->elements_end());
548  DIExpressionCursor Cursor(Ops);
549  DwarfExpr.setMemoryLocationKind();
550  DwarfExpr.addMachineRegExpression(
551  *Asm->MF->getSubtarget().getRegisterInfo(), Cursor, FrameReg);
552  DwarfExpr.addExpression(std::move(Cursor));
553  }
554  addBlock(*VariableDie, dwarf::DW_AT_location, DwarfExpr.finalize());
555 
556  return VariableDie;
557 }
558 
560  const LexicalScope &Scope,
561  DIE *&ObjectPointer) {
562  auto Var = constructVariableDIE(DV, Scope.isAbstractScope());
563  if (DV.isObjectPointer())
564  ObjectPointer = Var;
565  return Var;
566 }
567 
569  SmallVectorImpl<DIE *> &Children,
570  bool *HasNonScopeChildren) {
571  assert(Children.empty());
572  DIE *ObjectPointer = nullptr;
573 
574  for (DbgVariable *DV : DU->getScopeVariables().lookup(Scope))
575  Children.push_back(constructVariableDIE(*DV, *Scope, ObjectPointer));
576 
577  // Skip imported directives in gmlt-like data.
579  // There is no need to emit empty lexical block DIE.
580  for (const auto *IE : ImportedEntities[Scope->getScopeNode()])
581  Children.push_back(
582  constructImportedEntityDIE(cast<DIImportedEntity>(IE)));
583  }
584 
585  if (HasNonScopeChildren)
586  *HasNonScopeChildren = !Children.empty();
587 
588  for (LexicalScope *LS : Scope->getChildren())
589  constructScopeDIE(LS, Children);
590 
591  return ObjectPointer;
592 }
593 
595  DIE &ScopeDIE = updateSubprogramScopeDIE(Sub);
596 
597  if (Scope) {
598  assert(!Scope->getInlinedAt());
599  assert(!Scope->isAbstractScope());
600  // Collect lexical scope children first.
601  // ObjectPointer might be a local (non-argument) local variable if it's a
602  // block's synthetic this pointer.
603  if (DIE *ObjectPointer = createAndAddScopeChildren(Scope, ScopeDIE))
604  addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, *ObjectPointer);
605  }
606 
607  // If this is a variadic function, add an unspecified parameter.
608  DITypeRefArray FnArgs = Sub->getType()->getTypeArray();
609 
610  // If we have a single element of null, it is a function that returns void.
611  // If we have more than one elements and the last one is null, it is a
612  // variadic function.
613  if (FnArgs.size() > 1 && !FnArgs[FnArgs.size() - 1] &&
615  ScopeDIE.addChild(
616  DIE::get(DIEValueAllocator, dwarf::DW_TAG_unspecified_parameters));
617 }
618 
620  DIE &ScopeDIE) {
621  // We create children when the scope DIE is not null.
622  SmallVector<DIE *, 8> Children;
623  DIE *ObjectPointer = createScopeChildrenDIE(Scope, Children);
624 
625  // Add children
626  for (auto &I : Children)
627  ScopeDIE.addChild(std::move(I));
628 
629  return ObjectPointer;
630 }
631 
633  LexicalScope *Scope) {
634  DIE *&AbsDef = getAbstractSPDies()[Scope->getScopeNode()];
635  if (AbsDef)
636  return;
637 
638  auto *SP = cast<DISubprogram>(Scope->getScopeNode());
639 
640  DIE *ContextDIE;
641  DwarfCompileUnit *ContextCU = this;
642 
644  ContextDIE = &getUnitDie();
645  // Some of this is duplicated from DwarfUnit::getOrCreateSubprogramDIE, with
646  // the important distinction that the debug node is not associated with the
647  // DIE (since the debug node will be associated with the concrete DIE, if
648  // any). It could be refactored to some common utility function.
649  else if (auto *SPDecl = SP->getDeclaration()) {
650  ContextDIE = &getUnitDie();
651  getOrCreateSubprogramDIE(SPDecl);
652  } else {
653  ContextDIE = getOrCreateContextDIE(resolve(SP->getScope()));
654  // The scope may be shared with a subprogram that has already been
655  // constructed in another CU, in which case we need to construct this
656  // subprogram in the same CU.
657  ContextCU = DD->lookupCU(ContextDIE->getUnitDie());
658  }
659 
660  // Passing null as the associated node because the abstract definition
661  // shouldn't be found by lookup.
662  AbsDef = &ContextCU->createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, nullptr);
663  ContextCU->applySubprogramAttributesToDefinition(SP, *AbsDef);
664 
665  if (!ContextCU->includeMinimalInlineScopes())
666  ContextCU->addUInt(*AbsDef, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
667  if (DIE *ObjectPointer = ContextCU->createAndAddScopeChildren(Scope, *AbsDef))
668  ContextCU->addDIEEntry(*AbsDef, dwarf::DW_AT_object_pointer, *ObjectPointer);
669 }
670 
672  const DIImportedEntity *Module) {
673  DIE *IMDie = DIE::get(DIEValueAllocator, (dwarf::Tag)Module->getTag());
674  insertDIE(Module, IMDie);
675  DIE *EntityDie;
676  auto *Entity = resolve(Module->getEntity());
677  if (auto *NS = dyn_cast<DINamespace>(Entity))
678  EntityDie = getOrCreateNameSpace(NS);
679  else if (auto *M = dyn_cast<DIModule>(Entity))
680  EntityDie = getOrCreateModule(M);
681  else if (auto *SP = dyn_cast<DISubprogram>(Entity))
682  EntityDie = getOrCreateSubprogramDIE(SP);
683  else if (auto *T = dyn_cast<DIType>(Entity))
684  EntityDie = getOrCreateTypeDIE(T);
685  else if (auto *GV = dyn_cast<DIGlobalVariable>(Entity))
686  EntityDie = getOrCreateGlobalVariableDIE(GV, {});
687  else
688  EntityDie = getDIE(Entity);
689  assert(EntityDie);
690  auto *File = Module->getFile();
691  addSourceLine(*IMDie, Module->getLine(), File ? File->getFilename() : "",
692  File ? File->getDirectory() : "");
693  addDIEEntry(*IMDie, dwarf::DW_AT_import, *EntityDie);
694  StringRef Name = Module->getName();
695  if (!Name.empty())
696  addString(*IMDie, dwarf::DW_AT_name, Name);
697 
698  return IMDie;
699 }
700 
702  DIE *D = getDIE(SP);
703  if (DIE *AbsSPDIE = getAbstractSPDies().lookup(SP)) {
704  if (D)
705  // If this subprogram has an abstract definition, reference that
706  addDIEEntry(*D, dwarf::DW_AT_abstract_origin, *AbsSPDIE);
707  } else {
709  if (D)
710  // And attach the attributes
712  }
713 }
714 
718  auto *VariableDie = Var.getDIE();
719  if (AbsVar && AbsVar->getDIE()) {
720  addDIEEntry(*VariableDie, dwarf::DW_AT_abstract_origin,
721  *AbsVar->getDIE());
722  } else
723  applyVariableAttributes(Var, *VariableDie);
724 }
725 
727  const DILocalVariable *Cleansed;
728  return getExistingAbstractVariable(IV, Cleansed);
729 }
730 
731 // Find abstract variable, if any, associated with Var.
733  InlinedVariable IV, const DILocalVariable *&Cleansed) {
734  // More then one inlined variable corresponds to one abstract variable.
735  Cleansed = IV.first;
736  auto &AbstractVariables = getAbstractVariables();
737  auto I = AbstractVariables.find(Cleansed);
738  if (I != AbstractVariables.end())
739  return I->second.get();
740  return nullptr;
741 }
742 
744  LexicalScope *Scope) {
745  assert(Scope && Scope->isAbstractScope());
746  auto AbsDbgVariable = llvm::make_unique<DbgVariable>(Var, /* IA */ nullptr);
747  DU->addScopeVariable(Scope, AbsDbgVariable.get());
748  getAbstractVariables()[Var] = std::move(AbsDbgVariable);
749 }
750 
751 void DwarfCompileUnit::emitHeader(bool UseOffsets) {
752  // Don't bother labeling the .dwo unit, as its offset isn't used.
753  if (!Skeleton) {
754  LabelBegin = Asm->createTempSymbol("cu_begin");
755  Asm->OutStreamer->EmitLabel(LabelBegin);
756  }
757 
758  dwarf::UnitType UT = Skeleton ? dwarf::DW_UT_split_compile
759  : DD->useSplitDwarf() ? dwarf::DW_UT_skeleton
760  : dwarf::DW_UT_compile;
761  DwarfUnit::emitCommonHeader(UseOffsets, UT);
762 }
763 
765  // Opting in to GNU Pubnames/types overrides the default to ensure these are
766  // generated for things like Gold's gdb_index generation.
767  if (CUNode->getGnuPubnames())
768  return true;
769 
770  return DD->tuneForGDB() && !includeMinimalInlineScopes();
771 }
772 
773 /// addGlobalName - Add a new global name to the compile unit.
775  const DIScope *Context) {
776  if (!hasDwarfPubSections())
777  return;
778  std::string FullName = getParentContextString(Context) + Name.str();
779  GlobalNames[FullName] = &Die;
780 }
781 
783  const DIScope *Context) {
784  if (!hasDwarfPubSections())
785  return;
786  std::string FullName = getParentContextString(Context) + Name.str();
787  // Insert, allowing the entry to remain as-is if it's already present
788  // This way the CU-level type DIE is preferred over the "can't describe this
789  // type as a unit offset because it's not really in the CU at all, it's only
790  // in a type unit"
791  GlobalNames.insert(std::make_pair(std::move(FullName), &getUnitDie()));
792 }
793 
794 /// Add a new global type to the unit.
795 void DwarfCompileUnit::addGlobalType(const DIType *Ty, const DIE &Die,
796  const DIScope *Context) {
797  if (!hasDwarfPubSections())
798  return;
799  std::string FullName = getParentContextString(Context) + Ty->getName().str();
800  GlobalTypes[FullName] = &Die;
801 }
802 
804  const DIScope *Context) {
805  if (!hasDwarfPubSections())
806  return;
807  std::string FullName = getParentContextString(Context) + Ty->getName().str();
808  // Insert, allowing the entry to remain as-is if it's already present
809  // This way the CU-level type DIE is preferred over the "can't describe this
810  // type as a unit offset because it's not really in the CU at all, it's only
811  // in a type unit"
812  GlobalTypes.insert(std::make_pair(std::move(FullName), &getUnitDie()));
813 }
814 
815 /// addVariableAddress - Add DW_AT_location attribute for a
816 /// DbgVariable based on provided MachineLocation.
818  MachineLocation Location) {
819  // addBlockByrefAddress is obsolete and will be removed soon.
820  // The clang frontend always generates block byref variables with a
821  // complex expression that encodes exactly what addBlockByrefAddress
822  // would do.
824  "block byref variable without a complex expression");
825  if (DV.hasComplexAddress())
826  addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
827  else if (DV.isBlockByrefVariable())
828  addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
829  else
830  addAddress(Die, dwarf::DW_AT_location, Location);
831 }
832 
833 /// Add an address attribute to a die based on the location provided.
835  const MachineLocation &Location) {
836  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
837  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
838  if (Location.isIndirect())
839  DwarfExpr.setMemoryLocationKind();
840 
841  DIExpressionCursor Cursor({});
843  if (!DwarfExpr.addMachineRegExpression(TRI, Cursor, Location.getReg()))
844  return;
845  DwarfExpr.addExpression(std::move(Cursor));
846 
847  // Now attach the location information to the DIE.
848  addBlock(Die, Attribute, DwarfExpr.finalize());
849 }
850 
851 /// Start with the address based on the location provided, and generate the
852 /// DWARF information necessary to find the actual variable given the extra
853 /// address information encoded in the DbgVariable, starting from the starting
854 /// location. Add the DWARF information to the die.
857  const MachineLocation &Location) {
858  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
859  DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
860  const DIExpression *DIExpr = DV.getSingleExpression();
861  DwarfExpr.addFragmentOffset(DIExpr);
862  if (Location.isIndirect())
863  DwarfExpr.setMemoryLocationKind();
864 
865  DIExpressionCursor Cursor(DIExpr);
867  if (!DwarfExpr.addMachineRegExpression(TRI, Cursor, Location.getReg()))
868  return;
869  DwarfExpr.addExpression(std::move(Cursor));
870 
871  // Now attach the location information to the DIE.
872  addBlock(Die, Attribute, DwarfExpr.finalize());
873 }
874 
875 /// Add a Dwarf loclistptr attribute data and value.
877  unsigned Index) {
878  dwarf::Form Form = DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
879  : dwarf::DW_FORM_data4;
880  Die.addValue(DIEValueAllocator, Attribute, Form, DIELocList(Index));
881 }
882 
884  DIE &VariableDie) {
885  StringRef Name = Var.getName();
886  if (!Name.empty())
887  addString(VariableDie, dwarf::DW_AT_name, Name);
888  const auto *DIVar = Var.getVariable();
889  if (DIVar)
890  if (uint32_t AlignInBytes = DIVar->getAlignInBytes())
891  addUInt(VariableDie, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
892  AlignInBytes);
893 
894  addSourceLine(VariableDie, DIVar);
895  addType(VariableDie, Var.getType());
896  if (Var.isArtificial())
897  addFlag(VariableDie, dwarf::DW_AT_artificial);
898 }
899 
900 /// Add a Dwarf expression attribute data and value.
902  const MCExpr *Expr) {
903  Die.addValue(DIEValueAllocator, (dwarf::Attribute)0, Form, DIEExpr(Expr));
904 }
905 
907  const DISubprogram *SP, DIE &SPDie) {
908  auto *SPDecl = SP->getDeclaration();
909  auto *Context = resolve(SPDecl ? SPDecl->getScope() : SP->getScope());
911  addGlobalName(SP->getName(), SPDie, Context);
912 }
913 
914 bool DwarfCompileUnit::isDwoUnit() const {
915  return DD->useSplitDwarf() && Skeleton;
916 }
917 
920  (DD->useSplitDwarf() && !Skeleton);
921 }
const DICompileUnit * getCUNode() const
Definition: DwarfUnit.h:113
const TargetLoweringObjectFile & getObjFileLowering() const
Return information about object file lowering.
Definition: AsmPrinter.cpp:205
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:1588
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:205
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:282
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:1494
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
MCSection & getSection(bool SetUsed=true) const
Get the section associated with a defined, non-absolute symbol.
Definition: MCSymbol.h:268
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:197
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:253
void attachLowHighPC(DIE &D, const MCSymbol *Begin, const MCSymbol *End)
void reserve(size_type N)
Definition: SmallVector.h:380
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:762
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:1597
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:697
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:191
T * resolve(TypedDINodeRef< T > Ref) const
Look in the DwarfDebug map for the MDNode that corresponds to the reference.
Definition: DwarfUnit.h:315
void addBlock(DIE &Die, dwarf::Attribute Attribute, DIELoc *Block)
Add block data.
Definition: DwarfUnit.cpp:324
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:562
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:45
static const uint16_t * lookup(unsigned opcode, unsigned domain, ArrayRef< uint16_t[3]> Table)
void addString(DIE &Die, dwarf::Attribute Attribute, StringRef Str)
Add a string attribute data and value.
Definition: DwarfUnit.cpp:240
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:1067
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:594
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:1187
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
void addSourceLine(DIE &Die, unsigned Line, StringRef File, StringRef Directory)
Add location information to specified debug information entry.
Definition: DwarfUnit.cpp:338
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
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
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:1541
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:1112
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
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:768
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:433
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:864
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:641
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.
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...
void addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIE &Entry)
Add a DIE attribute data and value.
Definition: DwarfUnit.cpp:288
iterator insert(iterator I, T &&Elt)
Definition: SmallVector.h:482
void append(in_iter in_start, in_iter in_end)
Add the specified range to the end of the SmallVector.
Definition: SmallVector.h:398
DIE * getOrCreateContextDIE(const DIScope *Context)
Get context owner&#39;s DIE.
Definition: DwarfUnit.cpp:667
unsigned getOrCreateSourceID(StringRef FileName, StringRef DirName) override
Look up the source ID with the given directory and source file names.
Representation of each machine instruction.
Definition: MachineInstr.h:59
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:317
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:96
const NodeList & List
Definition: RDFGraph.cpp:210
#define I(x, y, z)
Definition: MD5.cpp:58
bool isDefined(bool SetUsed=true) const
isDefined - Check if this symbol is defined (i.e., it has an address).
Definition: MCSymbol.h:249
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:1088
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:434
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:214
const DataLayout & getDataLayout() const
Return information about data layout.
Definition: AsmPrinter.cpp:209
bool isThreadLocal() const
If the value is "Thread Local", its value isn&#39;t shared by the threads.
Definition: GlobalValue.h:238
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:271
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