1 //===-- llvm/CodeGen/DwarfDebug.cpp - Dwarf Debug Framework ---------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains support for writing dwarf debug info into asm files.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "dwarfdebug"
15 #include "DwarfDebug.h"
18 #include "DwarfAccelTable.h"
19 #include "DwarfUnit.h"
20 #include "llvm/ADT/STLExtras.h"
21 #include "llvm/ADT/Statistic.h"
22 #include "llvm/ADT/StringExtras.h"
23 #include "llvm/ADT/Triple.h"
24 #include "llvm/CodeGen/MachineFunction.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/DIBuilder.h"
27 #include "llvm/DebugInfo.h"
28 #include "llvm/IR/Constants.h"
29 #include "llvm/IR/DataLayout.h"
30 #include "llvm/IR/Instructions.h"
31 #include "llvm/IR/Module.h"
32 #include "llvm/MC/MCAsmInfo.h"
33 #include "llvm/MC/MCSection.h"
34 #include "llvm/MC/MCStreamer.h"
35 #include "llvm/MC/MCSymbol.h"
36 #include "llvm/Support/CommandLine.h"
37 #include "llvm/Support/Debug.h"
38 #include "llvm/Support/Dwarf.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/FormattedStream.h"
41 #include "llvm/Support/MD5.h"
42 #include "llvm/Support/Path.h"
43 #include "llvm/Support/Timer.h"
44 #include "llvm/Support/ValueHandle.h"
45 #include "llvm/Target/TargetFrameLowering.h"
46 #include "llvm/Target/TargetLoweringObjectFile.h"
47 #include "llvm/Target/TargetMachine.h"
48 #include "llvm/Target/TargetOptions.h"
49 #include "llvm/Target/TargetRegisterInfo.h"
53 DisableDebugInfoPrinting("disable-debug-info-print", cl::Hidden,
54 cl::desc("Disable debug info printing"));
56 static cl::opt<bool> UnknownLocations(
57 "use-unknown-locations", cl::Hidden,
58 cl::desc("Make an absence of debug location information explicit."),
61 static cl::opt<bool> GenerateCUHash("generate-cu-hash", cl::Hidden,
62 cl::desc("Add the CU hash as the dwo_id."),
66 GenerateGnuPubSections("generate-gnu-dwarf-pub-sections", cl::Hidden,
67 cl::desc("Generate GNU-style pubnames and pubtypes"),
71 enum DefaultOnOff { Default, Enable, Disable };
74 static cl::opt<DefaultOnOff>
75 DwarfAccelTables("dwarf-accel-tables", cl::Hidden,
76 cl::desc("Output prototype dwarf accelerator tables."),
77 cl::values(clEnumVal(Default, "Default for platform"),
78 clEnumVal(Enable, "Enabled"),
79 clEnumVal(Disable, "Disabled"), clEnumValEnd),
82 static cl::opt<DefaultOnOff>
83 SplitDwarf("split-dwarf", cl::Hidden,
84 cl::desc("Output DWARF5 split debug info."),
85 cl::values(clEnumVal(Default, "Default for platform"),
86 clEnumVal(Enable, "Enabled"),
87 clEnumVal(Disable, "Disabled"), clEnumValEnd),
90 static cl::opt<DefaultOnOff>
91 DwarfPubSections("generate-dwarf-pub-sections", cl::Hidden,
92 cl::desc("Generate DWARF pubnames and pubtypes sections"),
93 cl::values(clEnumVal(Default, "Default for platform"),
94 clEnumVal(Enable, "Enabled"),
95 clEnumVal(Disable, "Disabled"), clEnumValEnd),
98 static cl::opt<unsigned>
99 DwarfVersionNumber("dwarf-version", cl::Hidden,
100 cl::desc("Generate DWARF for dwarf version."), cl::init(0));
103 DwarfCURanges("generate-dwarf-cu-ranges", cl::Hidden,
104 cl::desc("Generate DW_AT_ranges for compile units"),
107 static const char *const DWARFGroupName = "DWARF Emission";
108 static const char *const DbgTimerName = "DWARF Debug Writer";
110 //===----------------------------------------------------------------------===//
114 /// resolve - Look in the DwarfDebug map for the MDNode that
115 /// corresponds to the reference.
116 template <typename T> T DbgVariable::resolve(DIRef<T> Ref) const {
117 return DD->resolve(Ref);
120 DIType DbgVariable::getType() const {
121 DIType Ty = Var.getType();
122 // FIXME: isBlockByrefVariable should be reformulated in terms of complex
123 // addresses instead.
124 if (Var.isBlockByrefVariable()) {
125 /* Byref variables, in Blocks, are declared by the programmer as
126 "SomeType VarName;", but the compiler creates a
127 __Block_byref_x_VarName struct, and gives the variable VarName
128 either the struct, or a pointer to the struct, as its type. This
129 is necessary for various behind-the-scenes things the compiler
130 needs to do with by-reference variables in blocks.
132 However, as far as the original *programmer* is concerned, the
133 variable should still have type 'SomeType', as originally declared.
135 The following function dives into the __Block_byref_x_VarName
136 struct to find the original type of the variable. This will be
137 passed back to the code generating the type for the Debug
138 Information Entry for the variable 'VarName'. 'VarName' will then
139 have the original type 'SomeType' in its debug information.
141 The original type 'SomeType' will be the type of the field named
142 'VarName' inside the __Block_byref_x_VarName struct.
144 NOTE: In order for this to not completely fail on the debugger
145 side, the Debug Information Entry for the variable VarName needs to
146 have a DW_AT_location that tells the debugger how to unwind through
147 the pointers and __Block_byref_x_VarName struct to find the actual
148 value of the variable. The function addBlockByrefType does this. */
150 uint16_t tag = Ty.getTag();
152 if (tag == dwarf::DW_TAG_pointer_type)
153 subType = resolve(DIDerivedType(Ty).getTypeDerivedFrom());
155 DIArray Elements = DICompositeType(subType).getTypeArray();
156 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
157 DIDerivedType DT(Elements.getElement(i));
158 if (getName() == DT.getName())
159 return (resolve(DT.getTypeDerivedFrom()));
165 } // end llvm namespace
167 /// Return Dwarf Version by checking module flags.
168 static unsigned getDwarfVersionFromModule(const Module *M) {
169 Value *Val = M->getModuleFlag("Dwarf Version");
171 return dwarf::DWARF_VERSION;
172 return cast<ConstantInt>(Val)->getZExtValue();
175 DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
176 : Asm(A), MMI(Asm->MMI), FirstCU(0), SourceIdMap(DIEValueAllocator),
177 PrevLabel(NULL), GlobalRangeCount(0),
178 InfoHolder(A, "info_string", DIEValueAllocator), HasCURanges(false),
179 UsedNonDefaultText(false),
180 SkeletonHolder(A, "skel_string", DIEValueAllocator) {
182 DwarfInfoSectionSym = DwarfAbbrevSectionSym = DwarfStrSectionSym = 0;
183 DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = DwarfLineSectionSym = 0;
184 DwarfAddrSectionSym = 0;
185 DwarfAbbrevDWOSectionSym = DwarfStrDWOSectionSym = 0;
186 FunctionBeginSym = FunctionEndSym = 0;
190 // Turn on accelerator tables for Darwin by default, pubnames by
191 // default for non-Darwin, and handle split dwarf.
192 bool IsDarwin = Triple(A->getTargetTriple()).isOSDarwin();
194 if (DwarfAccelTables == Default)
195 HasDwarfAccelTables = IsDarwin;
197 HasDwarfAccelTables = DwarfAccelTables == Enable;
199 if (SplitDwarf == Default)
200 HasSplitDwarf = false;
202 HasSplitDwarf = SplitDwarf == Enable;
204 if (DwarfPubSections == Default)
205 HasDwarfPubSections = !IsDarwin;
207 HasDwarfPubSections = DwarfPubSections == Enable;
209 DwarfVersion = DwarfVersionNumber
211 : getDwarfVersionFromModule(MMI->getModule());
214 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
219 // Switch to the specified MCSection and emit an assembler
220 // temporary label to it if SymbolStem is specified.
221 static MCSymbol *emitSectionSym(AsmPrinter *Asm, const MCSection *Section,
222 const char *SymbolStem = 0) {
223 Asm->OutStreamer.SwitchSection(Section);
227 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
228 Asm->OutStreamer.EmitLabel(TmpSym);
232 DwarfFile::~DwarfFile() {
233 for (SmallVectorImpl<DwarfUnit *>::iterator I = CUs.begin(), E = CUs.end();
238 MCSymbol *DwarfFile::getStringPoolSym() {
239 return Asm->GetTempSymbol(StringPref);
242 MCSymbol *DwarfFile::getStringPoolEntry(StringRef Str) {
243 std::pair<MCSymbol *, unsigned> &Entry =
244 StringPool.GetOrCreateValue(Str).getValue();
248 Entry.second = NextStringPoolNumber++;
249 return Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
252 unsigned DwarfFile::getStringPoolIndex(StringRef Str) {
253 std::pair<MCSymbol *, unsigned> &Entry =
254 StringPool.GetOrCreateValue(Str).getValue();
258 Entry.second = NextStringPoolNumber++;
259 Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
263 unsigned DwarfFile::getAddrPoolIndex(const MCSymbol *Sym) {
264 return getAddrPoolIndex(MCSymbolRefExpr::Create(Sym, Asm->OutContext));
267 unsigned DwarfFile::getAddrPoolIndex(const MCExpr *Sym) {
268 std::pair<DenseMap<const MCExpr *, unsigned>::iterator, bool> P =
269 AddressPool.insert(std::make_pair(Sym, NextAddrPoolNumber));
271 ++NextAddrPoolNumber;
272 return P.first->second;
275 // Define a unique number for the abbreviation.
277 void DwarfFile::assignAbbrevNumber(DIEAbbrev &Abbrev) {
278 // Check the set for priors.
279 DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
281 // If it's newly added.
282 if (InSet == &Abbrev) {
283 // Add to abbreviation list.
284 Abbreviations.push_back(&Abbrev);
286 // Assign the vector position + 1 as its number.
287 Abbrev.setNumber(Abbreviations.size());
289 // Assign existing abbreviation number.
290 Abbrev.setNumber(InSet->getNumber());
294 static bool isObjCClass(StringRef Name) {
295 return Name.startswith("+") || Name.startswith("-");
298 static bool hasObjCCategory(StringRef Name) {
299 if (!isObjCClass(Name))
302 return Name.find(") ") != StringRef::npos;
305 static void getObjCClassCategory(StringRef In, StringRef &Class,
306 StringRef &Category) {
307 if (!hasObjCCategory(In)) {
308 Class = In.slice(In.find('[') + 1, In.find(' '));
313 Class = In.slice(In.find('[') + 1, In.find('('));
314 Category = In.slice(In.find('[') + 1, In.find(' '));
318 static StringRef getObjCMethodName(StringRef In) {
319 return In.slice(In.find(' ') + 1, In.find(']'));
322 // Helper for sorting sections into a stable output order.
323 static bool SectionSort(const MCSection *A, const MCSection *B) {
324 std::string LA = (A ? A->getLabelBeginName() : "");
325 std::string LB = (B ? B->getLabelBeginName() : "");
329 // Add the various names to the Dwarf accelerator table names.
330 // TODO: Determine whether or not we should add names for programs
331 // that do not have a DW_AT_name or DW_AT_linkage_name field - this
332 // is only slightly different than the lookup of non-standard ObjC names.
333 static void addSubprogramNames(DwarfUnit *TheU, DISubprogram SP, DIE *Die) {
334 if (!SP.isDefinition())
336 TheU->addAccelName(SP.getName(), Die);
338 // If the linkage name is different than the name, go ahead and output
339 // that as well into the name table.
340 if (SP.getLinkageName() != "" && SP.getName() != SP.getLinkageName())
341 TheU->addAccelName(SP.getLinkageName(), Die);
343 // If this is an Objective-C selector name add it to the ObjC accelerator
345 if (isObjCClass(SP.getName())) {
346 StringRef Class, Category;
347 getObjCClassCategory(SP.getName(), Class, Category);
348 TheU->addAccelObjC(Class, Die);
350 TheU->addAccelObjC(Category, Die);
351 // Also add the base method name to the name table.
352 TheU->addAccelName(getObjCMethodName(SP.getName()), Die);
356 /// isSubprogramContext - Return true if Context is either a subprogram
357 /// or another context nested inside a subprogram.
358 bool DwarfDebug::isSubprogramContext(const MDNode *Context) {
361 DIDescriptor D(Context);
362 if (D.isSubprogram())
365 return isSubprogramContext(resolve(DIType(Context).getContext()));
369 // Find DIE for the given subprogram and attach appropriate DW_AT_low_pc
370 // and DW_AT_high_pc attributes. If there are global variables in this
371 // scope then create and insert DIEs for these variables.
372 DIE *DwarfDebug::updateSubprogramScopeDIE(DwarfCompileUnit *SPCU,
374 DIE *SPDie = SPCU->getDIE(SP);
376 assert(SPDie && "Unable to find subprogram DIE!");
378 // If we're updating an abstract DIE, then we will be adding the children and
379 // object pointer later on. But what we don't want to do is process the
380 // concrete DIE twice.
381 if (DIE *AbsSPDIE = AbstractSPDies.lookup(SP)) {
382 // Pick up abstract subprogram DIE.
384 SPCU->createAndAddDIE(dwarf::DW_TAG_subprogram, *SPCU->getUnitDie());
385 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_abstract_origin, AbsSPDIE);
387 DISubprogram SPDecl = SP.getFunctionDeclaration();
388 if (!SPDecl.isSubprogram()) {
389 // There is not any need to generate specification DIE for a function
390 // defined at compile unit level. If a function is defined inside another
391 // function then gdb prefers the definition at top level and but does not
392 // expect specification DIE in parent function. So avoid creating
393 // specification DIE for a function defined inside a function.
394 DIScope SPContext = resolve(SP.getContext());
395 if (SP.isDefinition() && !SPContext.isCompileUnit() &&
396 !SPContext.isFile() && !isSubprogramContext(SPContext)) {
397 SPCU->addFlag(SPDie, dwarf::DW_AT_declaration);
400 DICompositeType SPTy = SP.getType();
401 DIArray Args = SPTy.getTypeArray();
402 uint16_t SPTag = SPTy.getTag();
403 if (SPTag == dwarf::DW_TAG_subroutine_type)
404 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
406 SPCU->createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
407 DIType ATy(Args.getElement(i));
408 SPCU->addType(Arg, ATy);
409 if (ATy.isArtificial())
410 SPCU->addFlag(Arg, dwarf::DW_AT_artificial);
411 if (ATy.isObjectPointer())
412 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_object_pointer, Arg);
414 DIE *SPDeclDie = SPDie;
415 SPDie = SPCU->createAndAddDIE(dwarf::DW_TAG_subprogram,
416 *SPCU->getUnitDie());
417 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification, SPDeclDie);
422 SPCU->addLabelAddress(SPDie, dwarf::DW_AT_low_pc, FunctionBeginSym);
423 SPCU->addLabelAddress(SPDie, dwarf::DW_AT_high_pc, FunctionEndSym);
425 // Add this range to the list of ranges for the CU.
426 RangeSpan Span(FunctionBeginSym, FunctionEndSym);
427 SPCU->addRange(llvm_move(Span));
429 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
430 MachineLocation Location(RI->getFrameRegister(*Asm->MF));
431 SPCU->addAddress(SPDie, dwarf::DW_AT_frame_base, Location);
433 // Add name to the name table, we do this here because we're guaranteed
434 // to have concrete versions of our DW_TAG_subprogram nodes.
435 addSubprogramNames(SPCU, SP, SPDie);
440 /// Check whether we should create a DIE for the given Scope, return true
441 /// if we don't create a DIE (the corresponding DIE is null).
442 bool DwarfDebug::isLexicalScopeDIENull(LexicalScope *Scope) {
443 if (Scope->isAbstractScope())
446 // We don't create a DIE if there is no Range.
447 const SmallVectorImpl<InsnRange> &Ranges = Scope->getRanges();
451 if (Ranges.size() > 1)
454 // We don't create a DIE if we have a single Range and the end label
456 SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin();
457 MCSymbol *End = getLabelAfterInsn(RI->second);
461 static void addSectionLabel(AsmPrinter *Asm, DwarfUnit *U, DIE *D,
462 dwarf::Attribute A, const MCSymbol *L,
463 const MCSymbol *Sec) {
464 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
465 U->addSectionLabel(D, A, L);
467 U->addSectionDelta(D, A, L, Sec);
470 void DwarfDebug::addScopeRangeList(DwarfCompileUnit *TheCU, DIE *ScopeDIE,
471 const SmallVectorImpl<InsnRange> &Range) {
472 // Emit offset in .debug_range as a relocatable label. emitDIE will handle
473 // emitting it appropriately.
474 MCSymbol *RangeSym = Asm->GetTempSymbol("debug_ranges", GlobalRangeCount++);
475 addSectionLabel(Asm, TheCU, ScopeDIE, dwarf::DW_AT_ranges, RangeSym,
476 DwarfDebugRangeSectionSym);
478 RangeSpanList List(RangeSym);
479 for (SmallVectorImpl<InsnRange>::const_iterator RI = Range.begin(),
482 RangeSpan Span(getLabelBeforeInsn(RI->first),
483 getLabelAfterInsn(RI->second));
484 List.addRange(llvm_move(Span));
487 // Add the range list to the set of ranges to be emitted.
488 TheCU->addRangeList(llvm_move(List));
491 // Construct new DW_TAG_lexical_block for this scope and attach
492 // DW_AT_low_pc/DW_AT_high_pc labels.
493 DIE *DwarfDebug::constructLexicalScopeDIE(DwarfCompileUnit *TheCU,
494 LexicalScope *Scope) {
495 if (isLexicalScopeDIENull(Scope))
498 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_lexical_block);
499 if (Scope->isAbstractScope())
502 const SmallVectorImpl<InsnRange> &ScopeRanges = Scope->getRanges();
504 // If we have multiple ranges, emit them into the range section.
505 if (ScopeRanges.size() > 1) {
506 addScopeRangeList(TheCU, ScopeDIE, ScopeRanges);
510 // Construct the address range for this DIE.
511 SmallVectorImpl<InsnRange>::const_iterator RI = ScopeRanges.begin();
512 MCSymbol *Start = getLabelBeforeInsn(RI->first);
513 MCSymbol *End = getLabelAfterInsn(RI->second);
514 assert(End && "End label should not be null!");
516 assert(Start->isDefined() && "Invalid starting label for an inlined scope!");
517 assert(End->isDefined() && "Invalid end label for an inlined scope!");
519 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_low_pc, Start);
520 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_high_pc, End);
525 // This scope represents inlined body of a function. Construct DIE to
526 // represent this concrete inlined copy of the function.
527 DIE *DwarfDebug::constructInlinedScopeDIE(DwarfCompileUnit *TheCU,
528 LexicalScope *Scope) {
529 const SmallVectorImpl<InsnRange> &ScopeRanges = Scope->getRanges();
530 assert(!ScopeRanges.empty() &&
531 "LexicalScope does not have instruction markers!");
533 if (!Scope->getScopeNode())
535 DIScope DS(Scope->getScopeNode());
536 DISubprogram InlinedSP = getDISubprogram(DS);
537 DIE *OriginDIE = TheCU->getDIE(InlinedSP);
539 DEBUG(dbgs() << "Unable to find original DIE for an inlined subprogram.");
543 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine);
544 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin, OriginDIE);
546 // If we have multiple ranges, emit them into the range section.
547 if (ScopeRanges.size() > 1)
548 addScopeRangeList(TheCU, ScopeDIE, ScopeRanges);
550 SmallVectorImpl<InsnRange>::const_iterator RI = ScopeRanges.begin();
551 MCSymbol *StartLabel = getLabelBeforeInsn(RI->first);
552 MCSymbol *EndLabel = getLabelAfterInsn(RI->second);
554 if (StartLabel == 0 || EndLabel == 0)
555 llvm_unreachable("Unexpected Start and End labels for an inlined scope!");
557 assert(StartLabel->isDefined() &&
558 "Invalid starting label for an inlined scope!");
559 assert(EndLabel->isDefined() && "Invalid end label for an inlined scope!");
561 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_low_pc, StartLabel);
562 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_high_pc, EndLabel);
565 InlinedSubprogramDIEs.insert(OriginDIE);
567 // Add the call site information to the DIE.
568 DILocation DL(Scope->getInlinedAt());
569 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_file, None,
570 getOrCreateSourceID(DL.getFilename(), DL.getDirectory(),
571 TheCU->getUniqueID()));
572 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_line, None, DL.getLineNumber());
574 // Add name to the name table, we do this here because we're guaranteed
575 // to have concrete versions of our DW_TAG_inlined_subprogram nodes.
576 addSubprogramNames(TheCU, InlinedSP, ScopeDIE);
581 DIE *DwarfDebug::createScopeChildrenDIE(DwarfCompileUnit *TheCU,
583 SmallVectorImpl<DIE *> &Children) {
584 DIE *ObjectPointer = NULL;
586 // Collect arguments for current function.
587 if (LScopes.isCurrentFunctionScope(Scope))
588 for (unsigned i = 0, N = CurrentFnArguments.size(); i < N; ++i)
589 if (DbgVariable *ArgDV = CurrentFnArguments[i])
591 TheCU->constructVariableDIE(*ArgDV, Scope->isAbstractScope())) {
592 Children.push_back(Arg);
593 if (ArgDV->isObjectPointer())
597 // Collect lexical scope children first.
598 const SmallVectorImpl<DbgVariable *> &Variables =
599 ScopeVariables.lookup(Scope);
600 for (unsigned i = 0, N = Variables.size(); i < N; ++i)
601 if (DIE *Variable = TheCU->constructVariableDIE(*Variables[i],
602 Scope->isAbstractScope())) {
603 Children.push_back(Variable);
604 if (Variables[i]->isObjectPointer())
605 ObjectPointer = Variable;
607 const SmallVectorImpl<LexicalScope *> &Scopes = Scope->getChildren();
608 for (unsigned j = 0, M = Scopes.size(); j < M; ++j)
609 if (DIE *Nested = constructScopeDIE(TheCU, Scopes[j]))
610 Children.push_back(Nested);
611 return ObjectPointer;
614 // Construct a DIE for this scope.
615 DIE *DwarfDebug::constructScopeDIE(DwarfCompileUnit *TheCU,
616 LexicalScope *Scope) {
617 if (!Scope || !Scope->getScopeNode())
620 DIScope DS(Scope->getScopeNode());
622 SmallVector<DIE *, 8> Children;
623 DIE *ObjectPointer = NULL;
624 bool ChildrenCreated = false;
626 // We try to create the scope DIE first, then the children DIEs. This will
627 // avoid creating un-used children then removing them later when we find out
628 // the scope DIE is null.
629 DIE *ScopeDIE = NULL;
630 if (Scope->getInlinedAt())
631 ScopeDIE = constructInlinedScopeDIE(TheCU, Scope);
632 else if (DS.isSubprogram()) {
633 ProcessedSPNodes.insert(DS);
634 if (Scope->isAbstractScope()) {
635 ScopeDIE = TheCU->getDIE(DS);
636 // Note down abstract DIE.
638 AbstractSPDies.insert(std::make_pair(DS, ScopeDIE));
640 ScopeDIE = updateSubprogramScopeDIE(TheCU, DISubprogram(DS));
642 // Early exit when we know the scope DIE is going to be null.
643 if (isLexicalScopeDIENull(Scope))
646 // We create children here when we know the scope DIE is not going to be
647 // null and the children will be added to the scope DIE.
648 ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
649 ChildrenCreated = true;
651 // There is no need to emit empty lexical block DIE.
652 std::pair<ImportedEntityMap::const_iterator,
653 ImportedEntityMap::const_iterator> Range =
655 ScopesWithImportedEntities.begin(),
656 ScopesWithImportedEntities.end(),
657 std::pair<const MDNode *, const MDNode *>(DS, (const MDNode *)0),
659 if (Children.empty() && Range.first == Range.second)
661 ScopeDIE = constructLexicalScopeDIE(TheCU, Scope);
662 assert(ScopeDIE && "Scope DIE should not be null.");
663 for (ImportedEntityMap::const_iterator i = Range.first; i != Range.second;
665 constructImportedEntityDIE(TheCU, i->second, ScopeDIE);
669 assert(Children.empty() &&
670 "We create children only when the scope DIE is not null.");
673 if (!ChildrenCreated)
674 // We create children when the scope DIE is not null.
675 ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
678 for (SmallVectorImpl<DIE *>::iterator I = Children.begin(),
681 ScopeDIE->addChild(*I);
683 if (DS.isSubprogram() && ObjectPointer != NULL)
684 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, ObjectPointer);
689 // Look up the source id with the given directory and source file names.
690 // If none currently exists, create a new id and insert it in the
691 // SourceIds map. This can update DirectoryNames and SourceFileNames maps
693 unsigned DwarfDebug::getOrCreateSourceID(StringRef FileName, StringRef DirName,
695 // If we use .loc in assembly, we can't separate .file entries according to
696 // compile units. Thus all files will belong to the default compile unit.
698 // FIXME: add a better feature test than hasRawTextSupport. Even better,
699 // extend .file to support this.
700 if (Asm->TM.hasMCUseLoc() && Asm->OutStreamer.hasRawTextSupport())
703 // If FE did not provide a file name, then assume stdin.
704 if (FileName.empty())
705 return getOrCreateSourceID("<stdin>", StringRef(), CUID);
707 // TODO: this might not belong here. See if we can factor this better.
708 if (DirName == CompilationDir)
711 // FileIDCUMap stores the current ID for the given compile unit.
712 unsigned SrcId = FileIDCUMap[CUID] + 1;
714 // We look up the CUID/file/dir by concatenating them with a zero byte.
715 SmallString<128> NamePair;
716 NamePair += utostr(CUID);
719 NamePair += '\0'; // Zero bytes are not allowed in paths.
720 NamePair += FileName;
722 StringMapEntry<unsigned> &Ent = SourceIdMap.GetOrCreateValue(NamePair, SrcId);
723 if (Ent.getValue() != SrcId)
724 return Ent.getValue();
726 FileIDCUMap[CUID] = SrcId;
727 // Print out a .file directive to specify files for .loc directives.
728 Asm->OutStreamer.EmitDwarfFileDirective(SrcId, DirName, FileName, CUID);
733 void DwarfDebug::addGnuPubAttributes(DwarfUnit *U, DIE *D) const {
734 if (!GenerateGnuPubSections)
737 addSectionLabel(Asm, U, D, dwarf::DW_AT_GNU_pubnames,
738 Asm->GetTempSymbol("gnu_pubnames", U->getUniqueID()),
739 DwarfGnuPubNamesSectionSym);
741 addSectionLabel(Asm, U, D, dwarf::DW_AT_GNU_pubtypes,
742 Asm->GetTempSymbol("gnu_pubtypes", U->getUniqueID()),
743 DwarfGnuPubTypesSectionSym);
746 // Create new DwarfCompileUnit for the given metadata node with tag
747 // DW_TAG_compile_unit.
748 DwarfCompileUnit *DwarfDebug::constructDwarfCompileUnit(DICompileUnit DIUnit) {
749 StringRef FN = DIUnit.getFilename();
750 CompilationDir = DIUnit.getDirectory();
752 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
753 DwarfCompileUnit *NewCU = new DwarfCompileUnit(
754 InfoHolder.getUnits().size(), Die, DIUnit, Asm, this, &InfoHolder);
755 InfoHolder.addUnit(NewCU);
757 FileIDCUMap[NewCU->getUniqueID()] = 0;
758 // Call this to emit a .file directive if it wasn't emitted for the source
759 // file this CU comes from yet.
760 getOrCreateSourceID(FN, CompilationDir, NewCU->getUniqueID());
762 NewCU->addString(Die, dwarf::DW_AT_producer, DIUnit.getProducer());
763 NewCU->addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
764 DIUnit.getLanguage());
765 NewCU->addString(Die, dwarf::DW_AT_name, FN);
767 // Define start line table label for each Compile Unit.
768 MCSymbol *LineTableStartSym =
769 Asm->GetTempSymbol("line_table_start", NewCU->getUniqueID());
770 Asm->OutStreamer.getContext().setMCLineTableSymbol(LineTableStartSym,
771 NewCU->getUniqueID());
773 // Use a single line table if we are using .loc and generating assembly.
775 (Asm->TM.hasMCUseLoc() && Asm->OutStreamer.hasRawTextSupport()) ||
776 (NewCU->getUniqueID() == 0);
778 if (!useSplitDwarf()) {
779 // DW_AT_stmt_list is a offset of line number information for this
780 // compile unit in debug_line section. For split dwarf this is
781 // left in the skeleton CU and so not included.
782 // The line table entries are not always emitted in assembly, so it
783 // is not okay to use line_table_start here.
784 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
785 NewCU->addSectionLabel(Die, dwarf::DW_AT_stmt_list,
786 UseTheFirstCU ? Asm->GetTempSymbol("section_line")
787 : LineTableStartSym);
788 else if (UseTheFirstCU)
789 NewCU->addSectionOffset(Die, dwarf::DW_AT_stmt_list, 0);
791 NewCU->addSectionDelta(Die, dwarf::DW_AT_stmt_list, LineTableStartSym,
792 DwarfLineSectionSym);
794 // If we're using split dwarf the compilation dir is going to be in the
795 // skeleton CU and so we don't need to duplicate it here.
796 if (!CompilationDir.empty())
797 NewCU->addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
799 addGnuPubAttributes(NewCU, Die);
802 if (DIUnit.isOptimized())
803 NewCU->addFlag(Die, dwarf::DW_AT_APPLE_optimized);
805 StringRef Flags = DIUnit.getFlags();
807 NewCU->addString(Die, dwarf::DW_AT_APPLE_flags, Flags);
809 if (unsigned RVer = DIUnit.getRunTimeVersion())
810 NewCU->addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
811 dwarf::DW_FORM_data1, RVer);
816 if (useSplitDwarf()) {
817 NewCU->initSection(Asm->getObjFileLowering().getDwarfInfoDWOSection(),
818 DwarfInfoDWOSectionSym);
819 NewCU->setSkeleton(constructSkeletonCU(NewCU));
821 NewCU->initSection(Asm->getObjFileLowering().getDwarfInfoSection(),
822 DwarfInfoSectionSym);
824 CUMap.insert(std::make_pair(DIUnit, NewCU));
825 CUDieMap.insert(std::make_pair(Die, NewCU));
829 // Construct subprogram DIE.
830 void DwarfDebug::constructSubprogramDIE(DwarfCompileUnit *TheCU,
832 // FIXME: We should only call this routine once, however, during LTO if a
833 // program is defined in multiple CUs we could end up calling it out of
834 // beginModule as we walk the CUs.
836 DwarfCompileUnit *&CURef = SPMap[N];
842 if (!SP.isDefinition())
843 // This is a method declaration which will be handled while constructing
847 DIE *SubprogramDie = TheCU->getOrCreateSubprogramDIE(SP);
849 // Expose as a global name.
850 TheCU->addGlobalName(SP.getName(), SubprogramDie, resolve(SP.getContext()));
853 void DwarfDebug::constructImportedEntityDIE(DwarfCompileUnit *TheCU,
855 DIImportedEntity Module(N);
856 if (!Module.Verify())
858 if (DIE *D = TheCU->getOrCreateContextDIE(Module.getContext()))
859 constructImportedEntityDIE(TheCU, Module, D);
862 void DwarfDebug::constructImportedEntityDIE(DwarfCompileUnit *TheCU,
863 const MDNode *N, DIE *Context) {
864 DIImportedEntity Module(N);
865 if (!Module.Verify())
867 return constructImportedEntityDIE(TheCU, Module, Context);
870 void DwarfDebug::constructImportedEntityDIE(DwarfCompileUnit *TheCU,
871 const DIImportedEntity &Module,
873 assert(Module.Verify() &&
874 "Use one of the MDNode * overloads to handle invalid metadata");
875 assert(Context && "Should always have a context for an imported_module");
876 DIE *IMDie = new DIE(Module.getTag());
877 TheCU->insertDIE(Module, IMDie);
879 DIDescriptor Entity = Module.getEntity();
880 if (Entity.isNameSpace())
881 EntityDie = TheCU->getOrCreateNameSpace(DINameSpace(Entity));
882 else if (Entity.isSubprogram())
883 EntityDie = TheCU->getOrCreateSubprogramDIE(DISubprogram(Entity));
884 else if (Entity.isType())
885 EntityDie = TheCU->getOrCreateTypeDIE(DIType(Entity));
887 EntityDie = TheCU->getDIE(Entity);
888 unsigned FileID = getOrCreateSourceID(Module.getContext().getFilename(),
889 Module.getContext().getDirectory(),
890 TheCU->getUniqueID());
891 TheCU->addUInt(IMDie, dwarf::DW_AT_decl_file, None, FileID);
892 TheCU->addUInt(IMDie, dwarf::DW_AT_decl_line, None, Module.getLineNumber());
893 TheCU->addDIEEntry(IMDie, dwarf::DW_AT_import, EntityDie);
894 StringRef Name = Module.getName();
896 TheCU->addString(IMDie, dwarf::DW_AT_name, Name);
897 Context->addChild(IMDie);
900 // Emit all Dwarf sections that should come prior to the content. Create
901 // global DIEs and emit initial debug info sections. This is invoked by
902 // the target AsmPrinter.
903 void DwarfDebug::beginModule() {
904 if (DisableDebugInfoPrinting)
907 const Module *M = MMI->getModule();
909 // If module has named metadata anchors then use them, otherwise scan the
910 // module using debug info finder to collect debug info.
911 NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
914 TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
916 // Emit initial sections so we can reference labels later.
919 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
920 DICompileUnit CUNode(CU_Nodes->getOperand(i));
921 DwarfCompileUnit *CU = constructDwarfCompileUnit(CUNode);
922 DIArray ImportedEntities = CUNode.getImportedEntities();
923 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
924 ScopesWithImportedEntities.push_back(std::make_pair(
925 DIImportedEntity(ImportedEntities.getElement(i)).getContext(),
926 ImportedEntities.getElement(i)));
927 std::sort(ScopesWithImportedEntities.begin(),
928 ScopesWithImportedEntities.end(), less_first());
929 DIArray GVs = CUNode.getGlobalVariables();
930 for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i)
931 CU->createGlobalVariableDIE(DIGlobalVariable(GVs.getElement(i)));
932 DIArray SPs = CUNode.getSubprograms();
933 for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
934 constructSubprogramDIE(CU, SPs.getElement(i));
935 DIArray EnumTypes = CUNode.getEnumTypes();
936 for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i)
937 CU->getOrCreateTypeDIE(EnumTypes.getElement(i));
938 DIArray RetainedTypes = CUNode.getRetainedTypes();
939 for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i)
940 CU->getOrCreateTypeDIE(RetainedTypes.getElement(i));
941 // Emit imported_modules last so that the relevant context is already
943 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
944 constructImportedEntityDIE(CU, ImportedEntities.getElement(i));
947 // Tell MMI that we have debug info.
948 MMI->setDebugInfoAvailability(true);
950 // Prime section data.
951 SectionMap[Asm->getObjFileLowering().getTextSection()];
954 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
955 void DwarfDebug::computeInlinedDIEs() {
956 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
957 for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(),
958 AE = InlinedSubprogramDIEs.end();
961 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
963 for (DenseMap<const MDNode *, DIE *>::iterator AI = AbstractSPDies.begin(),
964 AE = AbstractSPDies.end();
966 DIE *ISP = AI->second;
967 if (InlinedSubprogramDIEs.count(ISP))
969 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
973 // Collect info for variables that were optimized out.
974 void DwarfDebug::collectDeadVariables() {
975 const Module *M = MMI->getModule();
977 if (NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu")) {
978 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
979 DICompileUnit TheCU(CU_Nodes->getOperand(i));
980 DIArray Subprograms = TheCU.getSubprograms();
981 for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
982 DISubprogram SP(Subprograms.getElement(i));
983 if (ProcessedSPNodes.count(SP) != 0)
985 if (!SP.isSubprogram())
987 if (!SP.isDefinition())
989 DIArray Variables = SP.getVariables();
990 if (Variables.getNumElements() == 0)
993 // Construct subprogram DIE and add variables DIEs.
994 DwarfCompileUnit *SPCU =
995 static_cast<DwarfCompileUnit *>(CUMap.lookup(TheCU));
996 assert(SPCU && "Unable to find Compile Unit!");
997 // FIXME: See the comment in constructSubprogramDIE about duplicate
999 constructSubprogramDIE(SPCU, SP);
1000 DIE *SPDIE = SPCU->getDIE(SP);
1001 for (unsigned vi = 0, ve = Variables.getNumElements(); vi != ve; ++vi) {
1002 DIVariable DV(Variables.getElement(vi));
1003 if (!DV.isVariable())
1005 DbgVariable NewVar(DV, NULL, this);
1006 if (DIE *VariableDIE = SPCU->constructVariableDIE(NewVar, false))
1007 SPDIE->addChild(VariableDIE);
1014 void DwarfDebug::finalizeModuleInfo() {
1015 // Collect info for variables that were optimized out.
1016 collectDeadVariables();
1018 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
1019 computeInlinedDIEs();
1021 // Handle anything that needs to be done on a per-unit basis after
1022 // all other generation.
1023 for (SmallVectorImpl<DwarfUnit *>::const_iterator I = getUnits().begin(),
1024 E = getUnits().end();
1026 DwarfUnit *TheU = *I;
1027 // Emit DW_AT_containing_type attribute to connect types with their
1028 // vtable holding type.
1029 TheU->constructContainingTypeDIEs();
1031 // Add CU specific attributes if we need to add any.
1032 if (TheU->getUnitDie()->getTag() == dwarf::DW_TAG_compile_unit) {
1033 // If we're splitting the dwarf out now that we've got the entire
1034 // CU then add the dwo id to it.
1035 DwarfCompileUnit *SkCU =
1036 static_cast<DwarfCompileUnit *>(TheU->getSkeleton());
1037 if (useSplitDwarf()) {
1038 // This should be a unique identifier when we want to build .dwp files.
1040 if (GenerateCUHash) {
1042 ID = CUHash.computeCUSignature(*TheU->getUnitDie());
1044 TheU->addUInt(TheU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
1045 dwarf::DW_FORM_data8, ID);
1046 SkCU->addUInt(SkCU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
1047 dwarf::DW_FORM_data8, ID);
1050 // If we have code split among multiple sections or we've requested
1051 // it then emit a DW_AT_ranges attribute on the unit that will remain
1052 // in the .o file, otherwise add a DW_AT_low_pc.
1053 // FIXME: Also add a high pc if we can.
1054 // FIXME: We should use ranges if we have multiple compile units or
1055 // allow reordering of code ala .subsections_via_symbols in mach-o.
1056 DwarfCompileUnit *U = SkCU ? SkCU : static_cast<DwarfCompileUnit *>(TheU);
1057 if (useCURanges() && TheU->getRanges().size())
1058 addSectionLabel(Asm, U, U->getUnitDie(), dwarf::DW_AT_ranges,
1059 Asm->GetTempSymbol("cu_ranges", U->getUniqueID()),
1060 DwarfDebugRangeSectionSym);
1062 U->addUInt(U->getUnitDie(), dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
1067 // Compute DIE offsets and sizes.
1068 InfoHolder.computeSizeAndOffsets();
1069 if (useSplitDwarf())
1070 SkeletonHolder.computeSizeAndOffsets();
1073 void DwarfDebug::endSections() {
1074 // Filter labels by section.
1075 for (size_t n = 0; n < ArangeLabels.size(); n++) {
1076 const SymbolCU &SCU = ArangeLabels[n];
1077 if (SCU.Sym->isInSection()) {
1078 // Make a note of this symbol and it's section.
1079 const MCSection *Section = &SCU.Sym->getSection();
1080 if (!Section->getKind().isMetadata())
1081 SectionMap[Section].push_back(SCU);
1083 // Some symbols (e.g. common/bss on mach-o) can have no section but still
1084 // appear in the output. This sucks as we rely on sections to build
1085 // arange spans. We can do it without, but it's icky.
1086 SectionMap[NULL].push_back(SCU);
1090 // Build a list of sections used.
1091 std::vector<const MCSection *> Sections;
1092 for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
1094 const MCSection *Section = it->first;
1095 Sections.push_back(Section);
1098 // Sort the sections into order.
1099 // This is only done to ensure consistent output order across different runs.
1100 std::sort(Sections.begin(), Sections.end(), SectionSort);
1102 // Add terminating symbols for each section.
1103 for (unsigned ID = 0; ID < Sections.size(); ID++) {
1104 const MCSection *Section = Sections[ID];
1105 MCSymbol *Sym = NULL;
1108 // We can't call MCSection::getLabelEndName, as it's only safe to do so
1109 // if we know the section name up-front. For user-created sections, the
1111 // label may not be valid to use as a label. (section names can use a
1113 // set of characters on some systems)
1114 Sym = Asm->GetTempSymbol("debug_end", ID);
1115 Asm->OutStreamer.SwitchSection(Section);
1116 Asm->OutStreamer.EmitLabel(Sym);
1119 // Insert a final terminator.
1120 SectionMap[Section].push_back(SymbolCU(NULL, Sym));
1123 // For now only turn on CU ranges if we've explicitly asked for it,
1124 // we have -ffunction-sections enabled, or we've emitted a function
1125 // into a unique section. At this point all sections should be finalized
1126 // except for dwarf sections.
1127 HasCURanges = DwarfCURanges || UsedNonDefaultText ||
1128 TargetMachine::getFunctionSections();
1131 // Emit all Dwarf sections that should come after the content.
1132 void DwarfDebug::endModule() {
1139 // End any existing sections.
1140 // TODO: Does this need to happen?
1143 // Finalize the debug info for the module.
1144 finalizeModuleInfo();
1148 // Emit all the DIEs into a debug info section.
1151 // Corresponding abbreviations into a abbrev section.
1152 emitAbbreviations();
1154 // Emit info into a debug loc section.
1157 // Emit info into a debug aranges section.
1160 // Emit info into a debug ranges section.
1163 if (useSplitDwarf()) {
1166 emitDebugAbbrevDWO();
1167 // Emit DWO addresses.
1168 InfoHolder.emitAddresses(Asm->getObjFileLowering().getDwarfAddrSection());
1171 // Emit info into the dwarf accelerator table sections.
1172 if (useDwarfAccelTables()) {
1175 emitAccelNamespaces();
1179 // Emit the pubnames and pubtypes sections if requested.
1180 if (HasDwarfPubSections) {
1181 emitDebugPubNames(GenerateGnuPubSections);
1182 emitDebugPubTypes(GenerateGnuPubSections);
1188 // Reset these for the next Module if we have one.
1192 // Find abstract variable, if any, associated with Var.
1193 DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &DV,
1194 DebugLoc ScopeLoc) {
1195 LLVMContext &Ctx = DV->getContext();
1196 // More then one inlined variable corresponds to one abstract variable.
1197 DIVariable Var = cleanseInlinedVariable(DV, Ctx);
1198 DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var);
1200 return AbsDbgVariable;
1202 LexicalScope *Scope = LScopes.findAbstractScope(ScopeLoc.getScope(Ctx));
1206 AbsDbgVariable = new DbgVariable(Var, NULL, this);
1207 addScopeVariable(Scope, AbsDbgVariable);
1208 AbstractVariables[Var] = AbsDbgVariable;
1209 return AbsDbgVariable;
1212 // If Var is a current function argument then add it to CurrentFnArguments list.
1213 bool DwarfDebug::addCurrentFnArgument(DbgVariable *Var, LexicalScope *Scope) {
1214 if (!LScopes.isCurrentFunctionScope(Scope))
1216 DIVariable DV = Var->getVariable();
1217 if (DV.getTag() != dwarf::DW_TAG_arg_variable)
1219 unsigned ArgNo = DV.getArgNumber();
1223 size_t Size = CurrentFnArguments.size();
1225 CurrentFnArguments.resize(CurFn->getFunction()->arg_size());
1226 // llvm::Function argument size is not good indicator of how many
1227 // arguments does the function have at source level.
1229 CurrentFnArguments.resize(ArgNo * 2);
1230 CurrentFnArguments[ArgNo - 1] = Var;
1234 // Collect variable information from side table maintained by MMI.
1235 void DwarfDebug::collectVariableInfoFromMMITable(
1236 SmallPtrSet<const MDNode *, 16> &Processed) {
1237 MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
1238 for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
1241 const MDNode *Var = VI->first;
1244 Processed.insert(Var);
1246 const std::pair<unsigned, DebugLoc> &VP = VI->second;
1248 LexicalScope *Scope = LScopes.findLexicalScope(VP.second);
1250 // If variable scope is not found then skip this variable.
1254 DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
1255 DbgVariable *RegVar = new DbgVariable(DV, AbsDbgVariable, this);
1256 RegVar->setFrameIndex(VP.first);
1257 if (!addCurrentFnArgument(RegVar, Scope))
1258 addScopeVariable(Scope, RegVar);
1260 AbsDbgVariable->setFrameIndex(VP.first);
1264 // Return true if debug value, encoded by DBG_VALUE instruction, is in a
1266 static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
1267 assert(MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
1268 return MI->getNumOperands() == 3 && MI->getOperand(0).isReg() &&
1269 MI->getOperand(0).getReg() &&
1270 (MI->getOperand(1).isImm() ||
1271 (MI->getOperand(1).isReg() && MI->getOperand(1).getReg() == 0U));
1274 // Get .debug_loc entry for the instruction range starting at MI.
1275 static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
1276 const MCSymbol *FLabel,
1277 const MCSymbol *SLabel,
1278 const MachineInstr *MI) {
1279 const MDNode *Var = MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1281 assert(MI->getNumOperands() == 3);
1282 if (MI->getOperand(0).isReg()) {
1283 MachineLocation MLoc;
1284 // If the second operand is an immediate, this is a
1285 // register-indirect address.
1286 if (!MI->getOperand(1).isImm())
1287 MLoc.set(MI->getOperand(0).getReg());
1289 MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
1290 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1292 if (MI->getOperand(0).isImm())
1293 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getImm());
1294 if (MI->getOperand(0).isFPImm())
1295 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getFPImm());
1296 if (MI->getOperand(0).isCImm())
1297 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getCImm());
1299 llvm_unreachable("Unexpected 3 operand DBG_VALUE instruction!");
1302 // Find variables for each lexical scope.
1304 DwarfDebug::collectVariableInfo(SmallPtrSet<const MDNode *, 16> &Processed) {
1306 // Grab the variable info that was squirreled away in the MMI side-table.
1307 collectVariableInfoFromMMITable(Processed);
1309 for (SmallVectorImpl<const MDNode *>::const_iterator
1310 UVI = UserVariables.begin(),
1311 UVE = UserVariables.end();
1312 UVI != UVE; ++UVI) {
1313 const MDNode *Var = *UVI;
1314 if (Processed.count(Var))
1317 // History contains relevant DBG_VALUE instructions for Var and instructions
1319 SmallVectorImpl<const MachineInstr *> &History = DbgValues[Var];
1320 if (History.empty())
1322 const MachineInstr *MInsn = History.front();
1325 LexicalScope *Scope = NULL;
1326 if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
1327 DISubprogram(DV.getContext()).describes(CurFn->getFunction()))
1328 Scope = LScopes.getCurrentFunctionScope();
1329 else if (MDNode *IA = DV.getInlinedAt())
1330 Scope = LScopes.findInlinedScope(DebugLoc::getFromDILocation(IA));
1332 Scope = LScopes.findLexicalScope(cast<MDNode>(DV->getOperand(1)));
1333 // If variable scope is not found then skip this variable.
1337 Processed.insert(DV);
1338 assert(MInsn->isDebugValue() && "History must begin with debug value");
1339 DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc());
1340 DbgVariable *RegVar = new DbgVariable(DV, AbsVar, this);
1341 if (!addCurrentFnArgument(RegVar, Scope))
1342 addScopeVariable(Scope, RegVar);
1344 AbsVar->setMInsn(MInsn);
1346 // Simplify ranges that are fully coalesced.
1347 if (History.size() <= 1 ||
1348 (History.size() == 2 && MInsn->isIdenticalTo(History.back()))) {
1349 RegVar->setMInsn(MInsn);
1353 // Handle multiple DBG_VALUE instructions describing one variable.
1354 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1356 for (SmallVectorImpl<const MachineInstr *>::const_iterator
1357 HI = History.begin(),
1360 const MachineInstr *Begin = *HI;
1361 assert(Begin->isDebugValue() && "Invalid History entry");
1363 // Check if DBG_VALUE is truncating a range.
1364 if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg() &&
1365 !Begin->getOperand(0).getReg())
1368 // Compute the range for a register location.
1369 const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
1370 const MCSymbol *SLabel = 0;
1373 // If Begin is the last instruction in History then its value is valid
1374 // until the end of the function.
1375 SLabel = FunctionEndSym;
1377 const MachineInstr *End = HI[1];
1378 DEBUG(dbgs() << "DotDebugLoc Pair:\n"
1379 << "\t" << *Begin << "\t" << *End << "\n");
1380 if (End->isDebugValue())
1381 SLabel = getLabelBeforeInsn(End);
1383 // End is a normal instruction clobbering the range.
1384 SLabel = getLabelAfterInsn(End);
1385 assert(SLabel && "Forgot label after clobber instruction");
1390 // The value is valid until the next DBG_VALUE or clobber.
1391 DotDebugLocEntries.push_back(
1392 getDebugLocEntry(Asm, FLabel, SLabel, Begin));
1394 DotDebugLocEntries.push_back(DotDebugLocEntry());
1397 // Collect info for variables that were optimized out.
1398 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1399 DIArray Variables = DISubprogram(FnScope->getScopeNode()).getVariables();
1400 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1401 DIVariable DV(Variables.getElement(i));
1402 if (!DV || !DV.isVariable() || !Processed.insert(DV))
1404 if (LexicalScope *Scope = LScopes.findLexicalScope(DV.getContext()))
1405 addScopeVariable(Scope, new DbgVariable(DV, NULL, this));
1409 // Return Label preceding the instruction.
1410 MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1411 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1412 assert(Label && "Didn't insert label before instruction");
1416 // Return Label immediately following the instruction.
1417 MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1418 return LabelsAfterInsn.lookup(MI);
1421 // Process beginning of an instruction.
1422 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1425 // Check if source location changes, but ignore DBG_VALUE locations.
1426 if (!MI->isDebugValue()) {
1427 DebugLoc DL = MI->getDebugLoc();
1428 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1431 if (DL == PrologEndLoc) {
1432 Flags |= DWARF2_FLAG_PROLOGUE_END;
1433 PrologEndLoc = DebugLoc();
1435 if (PrologEndLoc.isUnknown())
1436 Flags |= DWARF2_FLAG_IS_STMT;
1438 if (!DL.isUnknown()) {
1439 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1440 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1442 recordSourceLine(0, 0, 0, 0);
1446 // Insert labels where requested.
1447 DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
1448 LabelsBeforeInsn.find(MI);
1451 if (I == LabelsBeforeInsn.end())
1454 // Label already assigned.
1459 PrevLabel = MMI->getContext().CreateTempSymbol();
1460 Asm->OutStreamer.EmitLabel(PrevLabel);
1462 I->second = PrevLabel;
1465 // Process end of an instruction.
1466 void DwarfDebug::endInstruction() {
1468 // Don't create a new label after DBG_VALUE instructions.
1469 // They don't generate code.
1470 if (!CurMI->isDebugValue())
1473 DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
1474 LabelsAfterInsn.find(CurMI);
1478 if (I == LabelsAfterInsn.end())
1481 // Label already assigned.
1485 // We need a label after this instruction.
1487 PrevLabel = MMI->getContext().CreateTempSymbol();
1488 Asm->OutStreamer.EmitLabel(PrevLabel);
1490 I->second = PrevLabel;
1493 // Each LexicalScope has first instruction and last instruction to mark
1494 // beginning and end of a scope respectively. Create an inverse map that list
1495 // scopes starts (and ends) with an instruction. One instruction may start (or
1496 // end) multiple scopes. Ignore scopes that are not reachable.
1497 void DwarfDebug::identifyScopeMarkers() {
1498 SmallVector<LexicalScope *, 4> WorkList;
1499 WorkList.push_back(LScopes.getCurrentFunctionScope());
1500 while (!WorkList.empty()) {
1501 LexicalScope *S = WorkList.pop_back_val();
1503 const SmallVectorImpl<LexicalScope *> &Children = S->getChildren();
1504 if (!Children.empty())
1505 for (SmallVectorImpl<LexicalScope *>::const_iterator
1506 SI = Children.begin(),
1507 SE = Children.end();
1509 WorkList.push_back(*SI);
1511 if (S->isAbstractScope())
1514 const SmallVectorImpl<InsnRange> &Ranges = S->getRanges();
1517 for (SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin(),
1520 assert(RI->first && "InsnRange does not have first instruction!");
1521 assert(RI->second && "InsnRange does not have second instruction!");
1522 requestLabelBeforeInsn(RI->first);
1523 requestLabelAfterInsn(RI->second);
1528 // Gather pre-function debug information. Assumes being called immediately
1529 // after the function entry point has been emitted.
1530 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1533 // If there's no debug info for the function we're not going to do anything.
1534 if (!MMI->hasDebugInfo())
1537 // Grab the lexical scopes for the function, if we don't have any of those
1538 // then we're not going to be able to do anything.
1539 LScopes.initialize(*MF);
1540 if (LScopes.empty())
1543 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
1545 // Make sure that each lexical scope will have a begin/end label.
1546 identifyScopeMarkers();
1548 // Set DwarfDwarfCompileUnitID in MCContext to the Compile Unit this function
1549 // belongs to so that we add to the correct per-cu line table in the
1551 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1552 DwarfCompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1553 assert(TheCU && "Unable to find compile unit!");
1554 if (Asm->TM.hasMCUseLoc() && Asm->OutStreamer.hasRawTextSupport())
1555 // Use a single line table if we are using .loc and generating assembly.
1556 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1558 Asm->OutStreamer.getContext().setDwarfCompileUnitID(TheCU->getUniqueID());
1560 // Check the current section against the standard text section. If different
1561 // keep track so that we will know when we're emitting functions into multiple
1563 if (Asm->getObjFileLowering().getTextSection() != Asm->getCurrentSection())
1564 UsedNonDefaultText = true;
1566 // Emit a label for the function so that we have a beginning address.
1567 FunctionBeginSym = Asm->GetTempSymbol("func_begin", Asm->getFunctionNumber());
1568 // Assumes in correct section after the entry point.
1569 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1571 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1572 // LiveUserVar - Map physreg numbers to the MDNode they contain.
1573 std::vector<const MDNode *> LiveUserVar(TRI->getNumRegs());
1575 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); I != E;
1577 bool AtBlockEntry = true;
1578 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1580 const MachineInstr *MI = II;
1582 if (MI->isDebugValue()) {
1583 assert(MI->getNumOperands() > 1 && "Invalid machine instruction!");
1585 // Keep track of user variables.
1587 MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1589 // Variable is in a register, we need to check for clobbers.
1590 if (isDbgValueInDefinedReg(MI))
1591 LiveUserVar[MI->getOperand(0).getReg()] = Var;
1593 // Check the history of this variable.
1594 SmallVectorImpl<const MachineInstr *> &History = DbgValues[Var];
1595 if (History.empty()) {
1596 UserVariables.push_back(Var);
1597 // The first mention of a function argument gets the FunctionBeginSym
1598 // label, so arguments are visible when breaking at function entry.
1600 if (DV.isVariable() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
1601 getDISubprogram(DV.getContext()).describes(MF->getFunction()))
1602 LabelsBeforeInsn[MI] = FunctionBeginSym;
1604 // We have seen this variable before. Try to coalesce DBG_VALUEs.
1605 const MachineInstr *Prev = History.back();
1606 if (Prev->isDebugValue()) {
1607 // Coalesce identical entries at the end of History.
1608 if (History.size() >= 2 &&
1609 Prev->isIdenticalTo(History[History.size() - 2])) {
1610 DEBUG(dbgs() << "Coalescing identical DBG_VALUE entries:\n"
1611 << "\t" << *Prev << "\t"
1612 << *History[History.size() - 2] << "\n");
1616 // Terminate old register assignments that don't reach MI;
1617 MachineFunction::const_iterator PrevMBB = Prev->getParent();
1618 if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
1619 isDbgValueInDefinedReg(Prev)) {
1620 // Previous register assignment needs to terminate at the end of
1622 MachineBasicBlock::const_iterator LastMI =
1623 PrevMBB->getLastNonDebugInstr();
1624 if (LastMI == PrevMBB->end()) {
1625 // Drop DBG_VALUE for empty range.
1626 DEBUG(dbgs() << "Dropping DBG_VALUE for empty range:\n"
1627 << "\t" << *Prev << "\n");
1629 } else if (llvm::next(PrevMBB) != PrevMBB->getParent()->end())
1630 // Terminate after LastMI.
1631 History.push_back(LastMI);
1635 History.push_back(MI);
1637 // Not a DBG_VALUE instruction.
1639 AtBlockEntry = false;
1641 // First known non-DBG_VALUE and non-frame setup location marks
1642 // the beginning of the function body.
1643 if (!MI->getFlag(MachineInstr::FrameSetup) &&
1644 (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown()))
1645 PrologEndLoc = MI->getDebugLoc();
1647 // Check if the instruction clobbers any registers with debug vars.
1648 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
1649 MOE = MI->operands_end();
1650 MOI != MOE; ++MOI) {
1651 if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
1653 for (MCRegAliasIterator AI(MOI->getReg(), TRI, true); AI.isValid();
1656 const MDNode *Var = LiveUserVar[Reg];
1659 // Reg is now clobbered.
1660 LiveUserVar[Reg] = 0;
1662 // Was MD last defined by a DBG_VALUE referring to Reg?
1663 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
1664 if (HistI == DbgValues.end())
1666 SmallVectorImpl<const MachineInstr *> &History = HistI->second;
1667 if (History.empty())
1669 const MachineInstr *Prev = History.back();
1670 // Sanity-check: Register assignments are terminated at the end of
1672 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
1674 // Is the variable still in Reg?
1675 if (!isDbgValueInDefinedReg(Prev) ||
1676 Prev->getOperand(0).getReg() != Reg)
1678 // Var is clobbered. Make sure the next instruction gets a label.
1679 History.push_back(MI);
1686 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
1688 SmallVectorImpl<const MachineInstr *> &History = I->second;
1689 if (History.empty())
1692 // Make sure the final register assignments are terminated.
1693 const MachineInstr *Prev = History.back();
1694 if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
1695 const MachineBasicBlock *PrevMBB = Prev->getParent();
1696 MachineBasicBlock::const_iterator LastMI =
1697 PrevMBB->getLastNonDebugInstr();
1698 if (LastMI == PrevMBB->end())
1699 // Drop DBG_VALUE for empty range.
1701 else if (PrevMBB != &PrevMBB->getParent()->back()) {
1702 // Terminate after LastMI.
1703 History.push_back(LastMI);
1706 // Request labels for the full history.
1707 for (unsigned i = 0, e = History.size(); i != e; ++i) {
1708 const MachineInstr *MI = History[i];
1709 if (MI->isDebugValue())
1710 requestLabelBeforeInsn(MI);
1712 requestLabelAfterInsn(MI);
1716 PrevInstLoc = DebugLoc();
1717 PrevLabel = FunctionBeginSym;
1719 // Record beginning of function.
1720 if (!PrologEndLoc.isUnknown()) {
1721 DebugLoc FnStartDL =
1722 PrologEndLoc.getFnDebugLoc(MF->getFunction()->getContext());
1724 FnStartDL.getLine(), FnStartDL.getCol(),
1725 FnStartDL.getScope(MF->getFunction()->getContext()),
1726 // We'd like to list the prologue as "not statements" but GDB behaves
1727 // poorly if we do that. Revisit this with caution/GDB (7.5+) testing.
1728 DWARF2_FLAG_IS_STMT);
1732 void DwarfDebug::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
1733 SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
1734 DIVariable DV = Var->getVariable();
1735 // Variables with positive arg numbers are parameters.
1736 if (unsigned ArgNum = DV.getArgNumber()) {
1737 // Keep all parameters in order at the start of the variable list to ensure
1738 // function types are correct (no out-of-order parameters)
1740 // This could be improved by only doing it for optimized builds (unoptimized
1741 // builds have the right order to begin with), searching from the back (this
1742 // would catch the unoptimized case quickly), or doing a binary search
1743 // rather than linear search.
1744 SmallVectorImpl<DbgVariable *>::iterator I = Vars.begin();
1745 while (I != Vars.end()) {
1746 unsigned CurNum = (*I)->getVariable().getArgNumber();
1747 // A local (non-parameter) variable has been found, insert immediately
1751 // A later indexed parameter has been found, insert immediately before it.
1752 if (CurNum > ArgNum)
1756 Vars.insert(I, Var);
1760 Vars.push_back(Var);
1763 // Gather and emit post-function debug information.
1764 void DwarfDebug::endFunction(const MachineFunction *MF) {
1765 // Every beginFunction(MF) call should be followed by an endFunction(MF) call,
1766 // though the beginFunction may not be called at all.
1767 // We should handle both cases.
1771 assert(CurFn == MF);
1774 if (!MMI->hasDebugInfo() || LScopes.empty()) {
1779 // Define end label for subprogram.
1780 FunctionEndSym = Asm->GetTempSymbol("func_end", Asm->getFunctionNumber());
1781 // Assumes in correct section after the entry point.
1782 Asm->OutStreamer.EmitLabel(FunctionEndSym);
1783 // Set DwarfDwarfCompileUnitID in MCContext to default value.
1784 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1786 SmallPtrSet<const MDNode *, 16> ProcessedVars;
1787 collectVariableInfo(ProcessedVars);
1789 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1790 DwarfCompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1791 assert(TheCU && "Unable to find compile unit!");
1793 // Construct abstract scopes.
1794 ArrayRef<LexicalScope *> AList = LScopes.getAbstractScopesList();
1795 for (unsigned i = 0, e = AList.size(); i != e; ++i) {
1796 LexicalScope *AScope = AList[i];
1797 DISubprogram SP(AScope->getScopeNode());
1798 if (SP.isSubprogram()) {
1799 // Collect info for variables that were optimized out.
1800 DIArray Variables = SP.getVariables();
1801 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1802 DIVariable DV(Variables.getElement(i));
1803 if (!DV || !DV.isVariable() || !ProcessedVars.insert(DV))
1805 // Check that DbgVariable for DV wasn't created earlier, when
1806 // findAbstractVariable() was called for inlined instance of DV.
1807 LLVMContext &Ctx = DV->getContext();
1808 DIVariable CleanDV = cleanseInlinedVariable(DV, Ctx);
1809 if (AbstractVariables.lookup(CleanDV))
1811 if (LexicalScope *Scope = LScopes.findAbstractScope(DV.getContext()))
1812 addScopeVariable(Scope, new DbgVariable(DV, NULL, this));
1815 if (ProcessedSPNodes.count(AScope->getScopeNode()) == 0)
1816 constructScopeDIE(TheCU, AScope);
1819 DIE *CurFnDIE = constructScopeDIE(TheCU, FnScope);
1821 if (!CurFn->getTarget().Options.DisableFramePointerElim(*CurFn))
1822 TheCU->addFlag(CurFnDIE, dwarf::DW_AT_APPLE_omit_frame_ptr);
1825 for (ScopeVariablesMap::iterator I = ScopeVariables.begin(),
1826 E = ScopeVariables.end();
1828 DeleteContainerPointers(I->second);
1829 ScopeVariables.clear();
1830 DeleteContainerPointers(CurrentFnArguments);
1831 UserVariables.clear();
1833 AbstractVariables.clear();
1834 LabelsBeforeInsn.clear();
1835 LabelsAfterInsn.clear();
1840 // Register a source line with debug info. Returns the unique label that was
1841 // emitted and which provides correspondence to the source line list.
1842 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
1848 DIDescriptor Scope(S);
1850 if (Scope.isCompileUnit()) {
1851 DICompileUnit CU(S);
1852 Fn = CU.getFilename();
1853 Dir = CU.getDirectory();
1854 } else if (Scope.isFile()) {
1856 Fn = F.getFilename();
1857 Dir = F.getDirectory();
1858 } else if (Scope.isSubprogram()) {
1860 Fn = SP.getFilename();
1861 Dir = SP.getDirectory();
1862 } else if (Scope.isLexicalBlockFile()) {
1863 DILexicalBlockFile DBF(S);
1864 Fn = DBF.getFilename();
1865 Dir = DBF.getDirectory();
1866 } else if (Scope.isLexicalBlock()) {
1867 DILexicalBlock DB(S);
1868 Fn = DB.getFilename();
1869 Dir = DB.getDirectory();
1871 llvm_unreachable("Unexpected scope info");
1873 Src = getOrCreateSourceID(
1874 Fn, Dir, Asm->OutStreamer.getContext().getDwarfCompileUnitID());
1876 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0, 0, Fn);
1879 //===----------------------------------------------------------------------===//
1881 //===----------------------------------------------------------------------===//
1883 // Compute the size and offset of a DIE. The offset is relative to start of the
1884 // CU. It returns the offset after laying out the DIE.
1885 unsigned DwarfFile::computeSizeAndOffset(DIE *Die, unsigned Offset) {
1886 // Get the children.
1887 const std::vector<DIE *> &Children = Die->getChildren();
1889 // Record the abbreviation.
1890 assignAbbrevNumber(Die->getAbbrev());
1892 // Get the abbreviation for this DIE.
1893 const DIEAbbrev &Abbrev = Die->getAbbrev();
1896 Die->setOffset(Offset);
1898 // Start the size with the size of abbreviation code.
1899 Offset += MCAsmInfo::getULEB128Size(Die->getAbbrevNumber());
1901 const SmallVectorImpl<DIEValue *> &Values = Die->getValues();
1902 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
1904 // Size the DIE attribute values.
1905 for (unsigned i = 0, N = Values.size(); i < N; ++i)
1906 // Size attribute value.
1907 Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
1909 // Size the DIE children if any.
1910 if (!Children.empty()) {
1911 assert(Abbrev.getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
1912 "Children flag not set");
1914 for (unsigned j = 0, M = Children.size(); j < M; ++j)
1915 Offset = computeSizeAndOffset(Children[j], Offset);
1917 // End of children marker.
1918 Offset += sizeof(int8_t);
1921 Die->setSize(Offset - Die->getOffset());
1925 // Compute the size and offset for each DIE.
1926 void DwarfFile::computeSizeAndOffsets() {
1927 // Offset from the first CU in the debug info section is 0 initially.
1928 unsigned SecOffset = 0;
1930 // Iterate over each compile unit and set the size and offsets for each
1931 // DIE within each compile unit. All offsets are CU relative.
1932 for (SmallVectorImpl<DwarfUnit *>::const_iterator I = CUs.begin(),
1935 (*I)->setDebugInfoOffset(SecOffset);
1937 // CU-relative offset is reset to 0 here.
1938 unsigned Offset = sizeof(int32_t) + // Length of Unit Info
1939 (*I)->getHeaderSize(); // Unit-specific headers
1941 // EndOffset here is CU-relative, after laying out
1942 // all of the CU DIE.
1943 unsigned EndOffset = computeSizeAndOffset((*I)->getUnitDie(), Offset);
1944 SecOffset += EndOffset;
1948 // Emit initial Dwarf sections with a label at the start of each one.
1949 void DwarfDebug::emitSectionLabels() {
1950 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1952 // Dwarf sections base addresses.
1953 DwarfInfoSectionSym =
1954 emitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
1955 if (useSplitDwarf())
1956 DwarfInfoDWOSectionSym =
1957 emitSectionSym(Asm, TLOF.getDwarfInfoDWOSection(), "section_info_dwo");
1958 DwarfAbbrevSectionSym =
1959 emitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
1960 if (useSplitDwarf())
1961 DwarfAbbrevDWOSectionSym = emitSectionSym(
1962 Asm, TLOF.getDwarfAbbrevDWOSection(), "section_abbrev_dwo");
1963 emitSectionSym(Asm, TLOF.getDwarfARangesSection());
1965 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
1966 emitSectionSym(Asm, MacroInfo);
1968 DwarfLineSectionSym =
1969 emitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
1970 emitSectionSym(Asm, TLOF.getDwarfLocSection());
1971 if (GenerateGnuPubSections) {
1972 DwarfGnuPubNamesSectionSym =
1973 emitSectionSym(Asm, TLOF.getDwarfGnuPubNamesSection());
1974 DwarfGnuPubTypesSectionSym =
1975 emitSectionSym(Asm, TLOF.getDwarfGnuPubTypesSection());
1976 } else if (HasDwarfPubSections) {
1977 emitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
1978 emitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
1981 DwarfStrSectionSym =
1982 emitSectionSym(Asm, TLOF.getDwarfStrSection(), "info_string");
1983 if (useSplitDwarf()) {
1984 DwarfStrDWOSectionSym =
1985 emitSectionSym(Asm, TLOF.getDwarfStrDWOSection(), "skel_string");
1986 DwarfAddrSectionSym =
1987 emitSectionSym(Asm, TLOF.getDwarfAddrSection(), "addr_sec");
1989 DwarfDebugRangeSectionSym =
1990 emitSectionSym(Asm, TLOF.getDwarfRangesSection(), "debug_range");
1992 DwarfDebugLocSectionSym =
1993 emitSectionSym(Asm, TLOF.getDwarfLocSection(), "section_debug_loc");
1996 // Recursively emits a debug information entry.
1997 void DwarfDebug::emitDIE(DIE *Die) {
1998 // Get the abbreviation for this DIE.
1999 const DIEAbbrev &Abbrev = Die->getAbbrev();
2001 // Emit the code (index) for the abbreviation.
2002 if (Asm->isVerbose())
2003 Asm->OutStreamer.AddComment("Abbrev [" + Twine(Abbrev.getNumber()) +
2004 "] 0x" + Twine::utohexstr(Die->getOffset()) +
2005 ":0x" + Twine::utohexstr(Die->getSize()) + " " +
2006 dwarf::TagString(Abbrev.getTag()));
2007 Asm->EmitULEB128(Abbrev.getNumber());
2009 const SmallVectorImpl<DIEValue *> &Values = Die->getValues();
2010 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
2012 // Emit the DIE attribute values.
2013 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2014 dwarf::Attribute Attr = AbbrevData[i].getAttribute();
2015 dwarf::Form Form = AbbrevData[i].getForm();
2016 assert(Form && "Too many attributes for DIE (check abbreviation)");
2018 if (Asm->isVerbose())
2019 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
2022 case dwarf::DW_AT_abstract_origin:
2023 case dwarf::DW_AT_type:
2024 case dwarf::DW_AT_friend:
2025 case dwarf::DW_AT_specification:
2026 case dwarf::DW_AT_import:
2027 case dwarf::DW_AT_containing_type: {
2028 DIEEntry *E = cast<DIEEntry>(Values[i]);
2029 DIE *Origin = E->getEntry();
2030 unsigned Addr = Origin->getOffset();
2031 if (Form == dwarf::DW_FORM_ref_addr) {
2032 assert(!useSplitDwarf() && "TODO: dwo files can't have relocations.");
2033 // For DW_FORM_ref_addr, output the offset from beginning of debug info
2034 // section. Origin->getOffset() returns the offset from start of the
2036 DwarfCompileUnit *CU = CUDieMap.lookup(Origin->getUnit());
2037 assert(CU && "CUDie should belong to a CU.");
2038 Addr += CU->getDebugInfoOffset();
2039 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2040 Asm->EmitLabelPlusOffset(CU->getSectionSym(), Addr,
2041 DIEEntry::getRefAddrSize(Asm));
2043 Asm->EmitLabelOffsetDifference(CU->getSectionSym(), Addr,
2044 CU->getSectionSym(),
2045 DIEEntry::getRefAddrSize(Asm));
2047 // Make sure Origin belong to the same CU.
2048 assert(Die->getUnit() == Origin->getUnit() &&
2049 "The referenced DIE should belong to the same CU in ref4");
2050 Asm->EmitInt32(Addr);
2054 case dwarf::DW_AT_location: {
2055 if (DIELabel *L = dyn_cast<DIELabel>(Values[i])) {
2056 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2057 Asm->EmitSectionOffset(L->getValue(), DwarfDebugLocSectionSym);
2059 Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
2061 Values[i]->EmitValue(Asm, Form);
2065 case dwarf::DW_AT_accessibility: {
2066 if (Asm->isVerbose()) {
2067 DIEInteger *V = cast<DIEInteger>(Values[i]);
2068 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
2070 Values[i]->EmitValue(Asm, Form);
2074 // Emit an attribute using the defined form.
2075 Values[i]->EmitValue(Asm, Form);
2080 // Emit the DIE children if any.
2081 if (Abbrev.getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
2082 const std::vector<DIE *> &Children = Die->getChildren();
2084 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2085 emitDIE(Children[j]);
2087 Asm->OutStreamer.AddComment("End Of Children Mark");
2092 // Emit the various dwarf units to the unit section USection with
2093 // the abbreviations going into ASection.
2094 void DwarfFile::emitUnits(DwarfDebug *DD, const MCSection *ASection,
2095 const MCSymbol *ASectionSym) {
2096 for (SmallVectorImpl<DwarfUnit *>::iterator I = CUs.begin(), E = CUs.end();
2098 DwarfUnit *TheU = *I;
2099 DIE *Die = TheU->getUnitDie();
2100 const MCSection *USection = TheU->getSection();
2101 Asm->OutStreamer.SwitchSection(USection);
2103 // Emit the compile units header.
2104 Asm->OutStreamer.EmitLabel(TheU->getLabelBegin());
2106 // Emit size of content not including length itself
2107 Asm->OutStreamer.AddComment("Length of Unit");
2108 Asm->EmitInt32(TheU->getHeaderSize() + Die->getSize());
2110 TheU->emitHeader(ASection, ASectionSym);
2113 Asm->OutStreamer.EmitLabel(TheU->getLabelEnd());
2117 // Emit the debug info section.
2118 void DwarfDebug::emitDebugInfo() {
2119 DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2121 Holder.emitUnits(this, Asm->getObjFileLowering().getDwarfAbbrevSection(),
2122 DwarfAbbrevSectionSym);
2125 // Emit the abbreviation section.
2126 void DwarfDebug::emitAbbreviations() {
2127 DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2129 Holder.emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection());
2132 void DwarfFile::emitAbbrevs(const MCSection *Section) {
2133 // Check to see if it is worth the effort.
2134 if (!Abbreviations.empty()) {
2135 // Start the debug abbrev section.
2136 Asm->OutStreamer.SwitchSection(Section);
2138 // For each abbrevation.
2139 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
2140 // Get abbreviation data
2141 const DIEAbbrev *Abbrev = Abbreviations[i];
2143 // Emit the abbrevations code (base 1 index.)
2144 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
2146 // Emit the abbreviations data.
2150 // Mark end of abbreviations.
2151 Asm->EmitULEB128(0, "EOM(3)");
2155 // Emit the last address of the section and the end of the line matrix.
2156 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
2157 // Define last address of section.
2158 Asm->OutStreamer.AddComment("Extended Op");
2161 Asm->OutStreamer.AddComment("Op size");
2162 Asm->EmitInt8(Asm->getDataLayout().getPointerSize() + 1);
2163 Asm->OutStreamer.AddComment("DW_LNE_set_address");
2164 Asm->EmitInt8(dwarf::DW_LNE_set_address);
2166 Asm->OutStreamer.AddComment("Section end label");
2168 Asm->OutStreamer.EmitSymbolValue(
2169 Asm->GetTempSymbol("section_end", SectionEnd),
2170 Asm->getDataLayout().getPointerSize());
2172 // Mark end of matrix.
2173 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
2179 // Emit visible names into a hashed accelerator table section.
2180 void DwarfDebug::emitAccelNames() {
2182 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4));
2183 for (SmallVectorImpl<DwarfUnit *>::const_iterator I = getUnits().begin(),
2184 E = getUnits().end();
2186 DwarfUnit *TheU = *I;
2187 const StringMap<std::vector<const DIE *> > &Names = TheU->getAccelNames();
2188 for (StringMap<std::vector<const DIE *> >::const_iterator
2192 StringRef Name = GI->getKey();
2193 const std::vector<const DIE *> &Entities = GI->second;
2194 for (std::vector<const DIE *>::const_iterator DI = Entities.begin(),
2195 DE = Entities.end();
2197 AT.AddName(Name, *DI);
2201 AT.FinalizeTable(Asm, "Names");
2202 Asm->OutStreamer.SwitchSection(
2203 Asm->getObjFileLowering().getDwarfAccelNamesSection());
2204 MCSymbol *SectionBegin = Asm->GetTempSymbol("names_begin");
2205 Asm->OutStreamer.EmitLabel(SectionBegin);
2207 // Emit the full data.
2208 AT.Emit(Asm, SectionBegin, &InfoHolder);
2211 // Emit objective C classes and categories into a hashed accelerator table
2213 void DwarfDebug::emitAccelObjC() {
2215 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4));
2216 for (SmallVectorImpl<DwarfUnit *>::const_iterator I = getUnits().begin(),
2217 E = getUnits().end();
2219 DwarfUnit *TheU = *I;
2220 const StringMap<std::vector<const DIE *> > &Names = TheU->getAccelObjC();
2221 for (StringMap<std::vector<const DIE *> >::const_iterator
2225 StringRef Name = GI->getKey();
2226 const std::vector<const DIE *> &Entities = GI->second;
2227 for (std::vector<const DIE *>::const_iterator DI = Entities.begin(),
2228 DE = Entities.end();
2230 AT.AddName(Name, *DI);
2234 AT.FinalizeTable(Asm, "ObjC");
2235 Asm->OutStreamer.SwitchSection(
2236 Asm->getObjFileLowering().getDwarfAccelObjCSection());
2237 MCSymbol *SectionBegin = Asm->GetTempSymbol("objc_begin");
2238 Asm->OutStreamer.EmitLabel(SectionBegin);
2240 // Emit the full data.
2241 AT.Emit(Asm, SectionBegin, &InfoHolder);
2244 // Emit namespace dies into a hashed accelerator table.
2245 void DwarfDebug::emitAccelNamespaces() {
2247 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4));
2248 for (SmallVectorImpl<DwarfUnit *>::const_iterator I = getUnits().begin(),
2249 E = getUnits().end();
2251 DwarfUnit *TheU = *I;
2252 const StringMap<std::vector<const DIE *> > &Names =
2253 TheU->getAccelNamespace();
2254 for (StringMap<std::vector<const DIE *> >::const_iterator
2258 StringRef Name = GI->getKey();
2259 const std::vector<const DIE *> &Entities = GI->second;
2260 for (std::vector<const DIE *>::const_iterator DI = Entities.begin(),
2261 DE = Entities.end();
2263 AT.AddName(Name, *DI);
2267 AT.FinalizeTable(Asm, "namespac");
2268 Asm->OutStreamer.SwitchSection(
2269 Asm->getObjFileLowering().getDwarfAccelNamespaceSection());
2270 MCSymbol *SectionBegin = Asm->GetTempSymbol("namespac_begin");
2271 Asm->OutStreamer.EmitLabel(SectionBegin);
2273 // Emit the full data.
2274 AT.Emit(Asm, SectionBegin, &InfoHolder);
2277 // Emit type dies into a hashed accelerator table.
2278 void DwarfDebug::emitAccelTypes() {
2279 std::vector<DwarfAccelTable::Atom> Atoms;
2281 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4));
2283 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_tag, dwarf::DW_FORM_data2));
2285 DwarfAccelTable::Atom(dwarf::DW_ATOM_type_flags, dwarf::DW_FORM_data1));
2286 DwarfAccelTable AT(Atoms);
2287 for (SmallVectorImpl<DwarfUnit *>::const_iterator I = getUnits().begin(),
2288 E = getUnits().end();
2290 DwarfUnit *TheU = *I;
2291 const StringMap<std::vector<std::pair<const DIE *, unsigned> > > &Names =
2292 TheU->getAccelTypes();
2294 std::vector<std::pair<const DIE *, unsigned> > >::const_iterator
2298 StringRef Name = GI->getKey();
2299 const std::vector<std::pair<const DIE *, unsigned> > &Entities =
2301 for (std::vector<std::pair<const DIE *, unsigned> >::const_iterator
2302 DI = Entities.begin(),
2303 DE = Entities.end();
2305 AT.AddName(Name, DI->first, DI->second);
2309 AT.FinalizeTable(Asm, "types");
2310 Asm->OutStreamer.SwitchSection(
2311 Asm->getObjFileLowering().getDwarfAccelTypesSection());
2312 MCSymbol *SectionBegin = Asm->GetTempSymbol("types_begin");
2313 Asm->OutStreamer.EmitLabel(SectionBegin);
2315 // Emit the full data.
2316 AT.Emit(Asm, SectionBegin, &InfoHolder);
2319 // Public name handling.
2320 // The format for the various pubnames:
2322 // dwarf pubnames - offset/name pairs where the offset is the offset into the CU
2323 // for the DIE that is named.
2325 // gnu pubnames - offset/index value/name tuples where the offset is the offset
2326 // into the CU and the index value is computed according to the type of value
2327 // for the DIE that is named.
2329 // For type units the offset is the offset of the skeleton DIE. For split dwarf
2330 // it's the offset within the debug_info/debug_types dwo section, however, the
2331 // reference in the pubname header doesn't change.
2333 /// computeIndexValue - Compute the gdb index value for the DIE and CU.
2334 static dwarf::PubIndexEntryDescriptor computeIndexValue(DwarfUnit *CU,
2336 dwarf::GDBIndexEntryLinkage Linkage = dwarf::GIEL_STATIC;
2338 // We could have a specification DIE that has our most of our knowledge,
2339 // look for that now.
2340 DIEValue *SpecVal = Die->findAttribute(dwarf::DW_AT_specification);
2342 DIE *SpecDIE = cast<DIEEntry>(SpecVal)->getEntry();
2343 if (SpecDIE->findAttribute(dwarf::DW_AT_external))
2344 Linkage = dwarf::GIEL_EXTERNAL;
2345 } else if (Die->findAttribute(dwarf::DW_AT_external))
2346 Linkage = dwarf::GIEL_EXTERNAL;
2348 switch (Die->getTag()) {
2349 case dwarf::DW_TAG_class_type:
2350 case dwarf::DW_TAG_structure_type:
2351 case dwarf::DW_TAG_union_type:
2352 case dwarf::DW_TAG_enumeration_type:
2353 return dwarf::PubIndexEntryDescriptor(
2354 dwarf::GIEK_TYPE, CU->getLanguage() != dwarf::DW_LANG_C_plus_plus
2355 ? dwarf::GIEL_STATIC
2356 : dwarf::GIEL_EXTERNAL);
2357 case dwarf::DW_TAG_typedef:
2358 case dwarf::DW_TAG_base_type:
2359 case dwarf::DW_TAG_subrange_type:
2360 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_TYPE, dwarf::GIEL_STATIC);
2361 case dwarf::DW_TAG_namespace:
2362 return dwarf::GIEK_TYPE;
2363 case dwarf::DW_TAG_subprogram:
2364 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_FUNCTION, Linkage);
2365 case dwarf::DW_TAG_constant:
2366 case dwarf::DW_TAG_variable:
2367 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE, Linkage);
2368 case dwarf::DW_TAG_enumerator:
2369 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE,
2370 dwarf::GIEL_STATIC);
2372 return dwarf::GIEK_NONE;
2376 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
2378 void DwarfDebug::emitDebugPubNames(bool GnuStyle) {
2379 const MCSection *PSec =
2380 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubNamesSection()
2381 : Asm->getObjFileLowering().getDwarfPubNamesSection();
2383 DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2384 const SmallVectorImpl<DwarfUnit *> &Units = Holder.getUnits();
2385 for (unsigned i = 0; i != Units.size(); ++i) {
2386 DwarfUnit *TheU = Units[i];
2387 unsigned ID = TheU->getUniqueID();
2389 // Start the dwarf pubnames section.
2390 Asm->OutStreamer.SwitchSection(PSec);
2392 // Emit a label so we can reference the beginning of this pubname section.
2394 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("gnu_pubnames", ID));
2397 Asm->OutStreamer.AddComment("Length of Public Names Info");
2398 MCSymbol *BeginLabel = Asm->GetTempSymbol("pubnames_begin", ID);
2399 MCSymbol *EndLabel = Asm->GetTempSymbol("pubnames_end", ID);
2400 Asm->EmitLabelDifference(EndLabel, BeginLabel, 4);
2402 Asm->OutStreamer.EmitLabel(BeginLabel);
2404 Asm->OutStreamer.AddComment("DWARF Version");
2405 Asm->EmitInt16(dwarf::DW_PUBNAMES_VERSION);
2407 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2408 Asm->EmitSectionOffset(TheU->getLabelBegin(), TheU->getSectionSym());
2410 Asm->OutStreamer.AddComment("Compilation Unit Length");
2411 Asm->EmitLabelDifference(TheU->getLabelEnd(), TheU->getLabelBegin(), 4);
2413 // Emit the pubnames for this compilation unit.
2414 const StringMap<const DIE *> &Globals = getUnits()[ID]->getGlobalNames();
2415 for (StringMap<const DIE *>::const_iterator GI = Globals.begin(),
2418 const char *Name = GI->getKeyData();
2419 const DIE *Entity = GI->second;
2421 Asm->OutStreamer.AddComment("DIE offset");
2422 Asm->EmitInt32(Entity->getOffset());
2425 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheU, Entity);
2426 Asm->OutStreamer.AddComment(
2427 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
2428 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
2429 Asm->EmitInt8(Desc.toBits());
2432 Asm->OutStreamer.AddComment("External Name");
2433 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength() + 1));
2436 Asm->OutStreamer.AddComment("End Mark");
2438 Asm->OutStreamer.EmitLabel(EndLabel);
2442 void DwarfDebug::emitDebugPubTypes(bool GnuStyle) {
2443 const MCSection *PSec =
2444 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubTypesSection()
2445 : Asm->getObjFileLowering().getDwarfPubTypesSection();
2447 DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2448 const SmallVectorImpl<DwarfUnit *> &Units = Holder.getUnits();
2449 for (unsigned i = 0; i != Units.size(); ++i) {
2450 DwarfUnit *TheU = Units[i];
2451 unsigned ID = TheU->getUniqueID();
2453 // Start the dwarf pubtypes section.
2454 Asm->OutStreamer.SwitchSection(PSec);
2456 // Emit a label so we can reference the beginning of this pubtype section.
2458 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("gnu_pubtypes", ID));
2461 Asm->OutStreamer.AddComment("Length of Public Types Info");
2462 MCSymbol *BeginLabel = Asm->GetTempSymbol("pubtypes_begin", ID);
2463 MCSymbol *EndLabel = Asm->GetTempSymbol("pubtypes_end", ID);
2464 Asm->EmitLabelDifference(EndLabel, BeginLabel, 4);
2466 Asm->OutStreamer.EmitLabel(BeginLabel);
2468 Asm->OutStreamer.AddComment("DWARF Version");
2469 Asm->EmitInt16(dwarf::DW_PUBTYPES_VERSION);
2471 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2472 Asm->EmitSectionOffset(TheU->getLabelBegin(), TheU->getSectionSym());
2474 Asm->OutStreamer.AddComment("Compilation Unit Length");
2475 Asm->EmitLabelDifference(TheU->getLabelEnd(), TheU->getLabelBegin(), 4);
2477 // Emit the pubtypes.
2478 const StringMap<const DIE *> &Globals = getUnits()[ID]->getGlobalTypes();
2479 for (StringMap<const DIE *>::const_iterator GI = Globals.begin(),
2482 const char *Name = GI->getKeyData();
2483 const DIE *Entity = GI->second;
2485 Asm->OutStreamer.AddComment("DIE offset");
2486 Asm->EmitInt32(Entity->getOffset());
2489 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheU, Entity);
2490 Asm->OutStreamer.AddComment(
2491 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
2492 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
2493 Asm->EmitInt8(Desc.toBits());
2496 Asm->OutStreamer.AddComment("External Name");
2498 // Emit the name with a terminating null byte.
2499 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength() + 1));
2502 Asm->OutStreamer.AddComment("End Mark");
2504 Asm->OutStreamer.EmitLabel(EndLabel);
2508 // Emit strings into a string section.
2509 void DwarfFile::emitStrings(const MCSection *StrSection,
2510 const MCSection *OffsetSection = NULL,
2511 const MCSymbol *StrSecSym = NULL) {
2513 if (StringPool.empty())
2516 // Start the dwarf str section.
2517 Asm->OutStreamer.SwitchSection(StrSection);
2519 // Get all of the string pool entries and put them in an array by their ID so
2520 // we can sort them.
2522 std::pair<unsigned, StringMapEntry<std::pair<MCSymbol *, unsigned> > *>,
2525 for (StringMap<std::pair<MCSymbol *, unsigned> >::iterator
2526 I = StringPool.begin(),
2527 E = StringPool.end();
2529 Entries.push_back(std::make_pair(I->second.second, &*I));
2531 array_pod_sort(Entries.begin(), Entries.end());
2533 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2534 // Emit a label for reference from debug information entries.
2535 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
2537 // Emit the string itself with a terminating null byte.
2538 Asm->OutStreamer.EmitBytes(
2539 StringRef(Entries[i].second->getKeyData(),
2540 Entries[i].second->getKeyLength() + 1));
2543 // If we've got an offset section go ahead and emit that now as well.
2544 if (OffsetSection) {
2545 Asm->OutStreamer.SwitchSection(OffsetSection);
2546 unsigned offset = 0;
2547 unsigned size = 4; // FIXME: DWARF64 is 8.
2548 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2549 Asm->OutStreamer.EmitIntValue(offset, size);
2550 offset += Entries[i].second->getKeyLength() + 1;
2555 // Emit addresses into the section given.
2556 void DwarfFile::emitAddresses(const MCSection *AddrSection) {
2558 if (AddressPool.empty())
2561 // Start the dwarf addr section.
2562 Asm->OutStreamer.SwitchSection(AddrSection);
2564 // Order the address pool entries by ID
2565 SmallVector<const MCExpr *, 64> Entries(AddressPool.size());
2567 for (DenseMap<const MCExpr *, unsigned>::iterator I = AddressPool.begin(),
2568 E = AddressPool.end();
2570 Entries[I->second] = I->first;
2572 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2573 // Emit an expression for reference from debug information entries.
2574 if (const MCExpr *Expr = Entries[i])
2575 Asm->OutStreamer.EmitValue(Expr, Asm->getDataLayout().getPointerSize());
2577 Asm->OutStreamer.EmitIntValue(0, Asm->getDataLayout().getPointerSize());
2581 // Emit visible names into a debug str section.
2582 void DwarfDebug::emitDebugStr() {
2583 DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2584 Holder.emitStrings(Asm->getObjFileLowering().getDwarfStrSection());
2587 // Emit locations into the debug loc section.
2588 void DwarfDebug::emitDebugLoc() {
2589 if (DotDebugLocEntries.empty())
2592 for (SmallVectorImpl<DotDebugLocEntry>::iterator
2593 I = DotDebugLocEntries.begin(),
2594 E = DotDebugLocEntries.end();
2596 DotDebugLocEntry &Entry = *I;
2597 if (I + 1 != DotDebugLocEntries.end())
2601 // Start the dwarf loc section.
2602 Asm->OutStreamer.SwitchSection(
2603 Asm->getObjFileLowering().getDwarfLocSection());
2604 unsigned char Size = Asm->getDataLayout().getPointerSize();
2605 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
2607 for (SmallVectorImpl<DotDebugLocEntry>::iterator
2608 I = DotDebugLocEntries.begin(),
2609 E = DotDebugLocEntries.end();
2610 I != E; ++I, ++index) {
2611 DotDebugLocEntry &Entry = *I;
2612 if (Entry.isMerged())
2614 if (Entry.isEmpty()) {
2615 Asm->OutStreamer.EmitIntValue(0, Size);
2616 Asm->OutStreamer.EmitIntValue(0, Size);
2617 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
2619 Asm->OutStreamer.EmitSymbolValue(Entry.getBeginSym(), Size);
2620 Asm->OutStreamer.EmitSymbolValue(Entry.getEndSym(), Size);
2621 DIVariable DV(Entry.getVariable());
2622 Asm->OutStreamer.AddComment("Loc expr size");
2623 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
2624 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
2625 Asm->EmitLabelDifference(end, begin, 2);
2626 Asm->OutStreamer.EmitLabel(begin);
2627 if (Entry.isInt()) {
2628 DIBasicType BTy(DV.getType());
2629 if (BTy.Verify() && (BTy.getEncoding() == dwarf::DW_ATE_signed ||
2630 BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
2631 Asm->OutStreamer.AddComment("DW_OP_consts");
2632 Asm->EmitInt8(dwarf::DW_OP_consts);
2633 Asm->EmitSLEB128(Entry.getInt());
2635 Asm->OutStreamer.AddComment("DW_OP_constu");
2636 Asm->EmitInt8(dwarf::DW_OP_constu);
2637 Asm->EmitULEB128(Entry.getInt());
2639 } else if (Entry.isLocation()) {
2640 MachineLocation Loc = Entry.getLoc();
2641 if (!DV.hasComplexAddress())
2643 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2645 // Complex address entry.
2646 unsigned N = DV.getNumAddrElements();
2648 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
2649 if (Loc.getOffset()) {
2651 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2652 Asm->OutStreamer.AddComment("DW_OP_deref");
2653 Asm->EmitInt8(dwarf::DW_OP_deref);
2654 Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
2655 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2656 Asm->EmitSLEB128(DV.getAddrElement(1));
2658 // If first address element is OpPlus then emit
2659 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
2660 MachineLocation TLoc(Loc.getReg(), DV.getAddrElement(1));
2661 Asm->EmitDwarfRegOp(TLoc, DV.isIndirect());
2665 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2668 // Emit remaining complex address elements.
2669 for (; i < N; ++i) {
2670 uint64_t Element = DV.getAddrElement(i);
2671 if (Element == DIBuilder::OpPlus) {
2672 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2673 Asm->EmitULEB128(DV.getAddrElement(++i));
2674 } else if (Element == DIBuilder::OpDeref) {
2676 Asm->EmitInt8(dwarf::DW_OP_deref);
2678 llvm_unreachable("unknown Opcode found in complex address");
2682 // else ... ignore constant fp. There is not any good way to
2683 // to represent them here in dwarf.
2684 Asm->OutStreamer.EmitLabel(end);
2689 struct SymbolCUSorter {
2690 SymbolCUSorter(const MCStreamer &s) : Streamer(s) {}
2691 const MCStreamer &Streamer;
2693 bool operator()(const SymbolCU &A, const SymbolCU &B) {
2694 unsigned IA = A.Sym ? Streamer.GetSymbolOrder(A.Sym) : 0;
2695 unsigned IB = B.Sym ? Streamer.GetSymbolOrder(B.Sym) : 0;
2697 // Symbols with no order assigned should be placed at the end.
2698 // (e.g. section end labels)
2700 IA = (unsigned)(-1);
2702 IB = (unsigned)(-1);
2707 static bool CUSort(const DwarfUnit *A, const DwarfUnit *B) {
2708 return (A->getUniqueID() < B->getUniqueID());
2712 const MCSymbol *Start, *End;
2715 // Emit a debug aranges section, containing a CU lookup for any
2716 // address we can tie back to a CU.
2717 void DwarfDebug::emitDebugARanges() {
2718 // Start the dwarf aranges section.
2719 Asm->OutStreamer.SwitchSection(
2720 Asm->getObjFileLowering().getDwarfARangesSection());
2722 typedef DenseMap<DwarfCompileUnit *, std::vector<ArangeSpan> > SpansType;
2726 // Build a list of sections used.
2727 std::vector<const MCSection *> Sections;
2728 for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
2730 const MCSection *Section = it->first;
2731 Sections.push_back(Section);
2734 // Sort the sections into order.
2735 // This is only done to ensure consistent output order across different runs.
2736 std::sort(Sections.begin(), Sections.end(), SectionSort);
2738 // Build a set of address spans, sorted by CU.
2739 for (size_t SecIdx = 0; SecIdx < Sections.size(); SecIdx++) {
2740 const MCSection *Section = Sections[SecIdx];
2741 SmallVector<SymbolCU, 8> &List = SectionMap[Section];
2742 if (List.size() < 2)
2745 // Sort the symbols by offset within the section.
2746 SymbolCUSorter sorter(Asm->OutStreamer);
2747 std::sort(List.begin(), List.end(), sorter);
2749 // If we have no section (e.g. common), just write out
2750 // individual spans for each symbol.
2751 if (Section == NULL) {
2752 for (size_t n = 0; n < List.size(); n++) {
2753 const SymbolCU &Cur = List[n];
2756 Span.Start = Cur.Sym;
2759 Spans[Cur.CU].push_back(Span);
2762 // Build spans between each label.
2763 const MCSymbol *StartSym = List[0].Sym;
2764 for (size_t n = 1; n < List.size(); n++) {
2765 const SymbolCU &Prev = List[n - 1];
2766 const SymbolCU &Cur = List[n];
2768 // Try and build the longest span we can within the same CU.
2769 if (Cur.CU != Prev.CU) {
2771 Span.Start = StartSym;
2773 Spans[Prev.CU].push_back(Span);
2780 unsigned PtrSize = Asm->getDataLayout().getPointerSize();
2782 // Build a list of CUs used.
2783 std::vector<DwarfCompileUnit *> CUs;
2784 for (SpansType::iterator it = Spans.begin(); it != Spans.end(); it++) {
2785 DwarfCompileUnit *CU = it->first;
2789 // Sort the CU list (again, to ensure consistent output order).
2790 std::sort(CUs.begin(), CUs.end(), CUSort);
2792 // Emit an arange table for each CU we used.
2793 for (size_t CUIdx = 0; CUIdx < CUs.size(); CUIdx++) {
2794 DwarfCompileUnit *CU = CUs[CUIdx];
2795 std::vector<ArangeSpan> &List = Spans[CU];
2797 // Emit size of content not including length itself.
2798 unsigned ContentSize =
2799 sizeof(int16_t) + // DWARF ARange version number
2800 sizeof(int32_t) + // Offset of CU in the .debug_info section
2801 sizeof(int8_t) + // Pointer Size (in bytes)
2802 sizeof(int8_t); // Segment Size (in bytes)
2804 unsigned TupleSize = PtrSize * 2;
2806 // 7.20 in the Dwarf specs requires the table to be aligned to a tuple.
2808 OffsetToAlignment(sizeof(int32_t) + ContentSize, TupleSize);
2810 ContentSize += Padding;
2811 ContentSize += (List.size() + 1) * TupleSize;
2813 // For each compile unit, write the list of spans it covers.
2814 Asm->OutStreamer.AddComment("Length of ARange Set");
2815 Asm->EmitInt32(ContentSize);
2816 Asm->OutStreamer.AddComment("DWARF Arange version number");
2817 Asm->EmitInt16(dwarf::DW_ARANGES_VERSION);
2818 Asm->OutStreamer.AddComment("Offset Into Debug Info Section");
2819 Asm->EmitSectionOffset(CU->getLocalLabelBegin(), CU->getLocalSectionSym());
2820 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2821 Asm->EmitInt8(PtrSize);
2822 Asm->OutStreamer.AddComment("Segment Size (in bytes)");
2825 Asm->OutStreamer.EmitFill(Padding, 0xff);
2827 for (unsigned n = 0; n < List.size(); n++) {
2828 const ArangeSpan &Span = List[n];
2829 Asm->EmitLabelReference(Span.Start, PtrSize);
2831 // Calculate the size as being from the span start to it's end.
2833 Asm->EmitLabelDifference(Span.End, Span.Start, PtrSize);
2835 // For symbols without an end marker (e.g. common), we
2836 // write a single arange entry containing just that one symbol.
2837 uint64_t Size = SymSize[Span.Start];
2841 Asm->OutStreamer.EmitIntValue(Size, PtrSize);
2845 Asm->OutStreamer.AddComment("ARange terminator");
2846 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2847 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2851 // Emit visible names into a debug ranges section.
2852 void DwarfDebug::emitDebugRanges() {
2853 // Start the dwarf ranges section.
2854 Asm->OutStreamer.SwitchSection(
2855 Asm->getObjFileLowering().getDwarfRangesSection());
2857 // Size for our labels.
2858 unsigned char Size = Asm->getDataLayout().getPointerSize();
2860 // Grab the specific ranges for the compile units in the module.
2861 for (DenseMap<const MDNode *, DwarfCompileUnit *>::iterator I = CUMap.begin(),
2864 DwarfCompileUnit *TheCU = I->second;
2866 // Emit a symbol so we can find the beginning of our ranges.
2867 Asm->OutStreamer.EmitLabel(TheCU->getLabelRange());
2869 // Iterate over the misc ranges for the compile units in the module.
2870 const SmallVectorImpl<RangeSpanList> &RangeLists = TheCU->getRangeLists();
2871 for (SmallVectorImpl<RangeSpanList>::const_iterator I = RangeLists.begin(),
2872 E = RangeLists.end();
2874 const RangeSpanList &List = *I;
2876 // Emit our symbol so we can find the beginning of the range.
2877 Asm->OutStreamer.EmitLabel(List.getSym());
2879 for (SmallVectorImpl<RangeSpan>::const_iterator
2880 RI = List.getRanges().begin(),
2881 RE = List.getRanges().end();
2883 const RangeSpan &Range = *RI;
2884 const MCSymbol *Begin = Range.getStart();
2885 const MCSymbol *End = Range.getEnd();
2886 assert(Begin && "Range without a begin symbol?");
2887 assert(End && "Range without an end symbol?");
2888 Asm->OutStreamer.EmitSymbolValue(Begin, Size);
2889 Asm->OutStreamer.EmitSymbolValue(End, Size);
2892 // And terminate the list with two 0 values.
2893 Asm->OutStreamer.EmitIntValue(0, Size);
2894 Asm->OutStreamer.EmitIntValue(0, Size);
2897 // Now emit a range for the CU itself.
2898 if (useCURanges()) {
2899 Asm->OutStreamer.EmitLabel(
2900 Asm->GetTempSymbol("cu_ranges", TheCU->getUniqueID()));
2901 const SmallVectorImpl<RangeSpan> &Ranges = TheCU->getRanges();
2902 for (uint32_t i = 0, e = Ranges.size(); i != e; ++i) {
2903 RangeSpan Range = Ranges[i];
2904 const MCSymbol *Begin = Range.getStart();
2905 const MCSymbol *End = Range.getEnd();
2906 assert(Begin && "Range without a begin symbol?");
2907 assert(End && "Range without an end symbol?");
2908 Asm->OutStreamer.EmitSymbolValue(Begin, Size);
2909 Asm->OutStreamer.EmitSymbolValue(End, Size);
2911 // And terminate the list with two 0 values.
2912 Asm->OutStreamer.EmitIntValue(0, Size);
2913 Asm->OutStreamer.EmitIntValue(0, Size);
2918 // DWARF5 Experimental Separate Dwarf emitters.
2920 void DwarfDebug::initSkeletonUnit(const DwarfUnit *U, DIE *Die,
2922 NewU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name,
2923 U->getCUNode().getSplitDebugFilename());
2925 // Relocate to the beginning of the addr_base section, else 0 for the
2926 // beginning of the one for this compile unit.
2927 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2928 NewU->addSectionLabel(Die, dwarf::DW_AT_GNU_addr_base, DwarfAddrSectionSym);
2930 NewU->addSectionOffset(Die, dwarf::DW_AT_GNU_addr_base, 0);
2932 if (!CompilationDir.empty())
2933 NewU->addLocalString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
2935 addGnuPubAttributes(NewU, Die);
2937 SkeletonHolder.addUnit(NewU);
2940 // This DIE has the following attributes: DW_AT_comp_dir, DW_AT_stmt_list,
2941 // DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges, DW_AT_dwo_name, DW_AT_dwo_id,
2942 // DW_AT_ranges_base, DW_AT_addr_base.
2943 // TODO: Implement DW_AT_ranges_base.
2944 DwarfCompileUnit *DwarfDebug::constructSkeletonCU(const DwarfCompileUnit *CU) {
2946 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
2947 DwarfCompileUnit *NewCU = new DwarfCompileUnit(
2948 CU->getUniqueID(), Die, CU->getCUNode(), Asm, this, &SkeletonHolder);
2949 NewCU->initSection(Asm->getObjFileLowering().getDwarfInfoSection(),
2950 DwarfInfoSectionSym);
2952 // DW_AT_stmt_list is a offset of line number information for this
2953 // compile unit in debug_line section.
2954 // FIXME: Should handle multiple compile units.
2955 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2956 NewCU->addSectionLabel(Die, dwarf::DW_AT_stmt_list, DwarfLineSectionSym);
2958 NewCU->addSectionOffset(Die, dwarf::DW_AT_stmt_list, 0);
2960 initSkeletonUnit(CU, Die, NewCU);
2965 // This DIE has the following attributes: DW_AT_comp_dir, DW_AT_dwo_name,
2967 DwarfTypeUnit *DwarfDebug::constructSkeletonTU(const DwarfTypeUnit *TU) {
2969 DIE *Die = new DIE(dwarf::DW_TAG_type_unit);
2970 DwarfTypeUnit *NewTU = new DwarfTypeUnit(
2971 TU->getUniqueID(), Die, TU->getCUNode(), Asm, this, &SkeletonHolder);
2972 NewTU->setTypeSignature(TU->getTypeSignature());
2973 NewTU->setType(NULL);
2975 Asm->getObjFileLowering().getDwarfTypesSection(TU->getTypeSignature()));
2977 initSkeletonUnit(TU, Die, NewTU);
2981 // Emit the .debug_info.dwo section for separated dwarf. This contains the
2982 // compile units that would normally be in debug_info.
2983 void DwarfDebug::emitDebugInfoDWO() {
2984 assert(useSplitDwarf() && "No split dwarf debug info?");
2985 InfoHolder.emitUnits(this,
2986 Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
2987 DwarfAbbrevDWOSectionSym);
2990 // Emit the .debug_abbrev.dwo section for separated dwarf. This contains the
2991 // abbreviations for the .debug_info.dwo section.
2992 void DwarfDebug::emitDebugAbbrevDWO() {
2993 assert(useSplitDwarf() && "No split dwarf?");
2994 InfoHolder.emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevDWOSection());
2997 // Emit the .debug_str.dwo section for separated dwarf. This contains the
2998 // string section and is identical in format to traditional .debug_str
3000 void DwarfDebug::emitDebugStrDWO() {
3001 assert(useSplitDwarf() && "No split dwarf?");
3002 const MCSection *OffSec =
3003 Asm->getObjFileLowering().getDwarfStrOffDWOSection();
3004 const MCSymbol *StrSym = DwarfStrSectionSym;
3005 InfoHolder.emitStrings(Asm->getObjFileLowering().getDwarfStrDWOSection(),
3009 void DwarfDebug::addDwarfTypeUnitType(DICompileUnit CUNode,
3010 StringRef Identifier, DIE *RefDie,
3011 DICompositeType CTy) {
3013 const DwarfTypeUnit *&TU = DwarfTypeUnits[CTy];
3015 CUMap.begin()->second->addDIETypeSignature(RefDie, *TU);
3019 DIE *UnitDie = new DIE(dwarf::DW_TAG_type_unit);
3020 DwarfTypeUnit *NewTU = new DwarfTypeUnit(
3021 InfoHolder.getUnits().size(), UnitDie, CUNode, Asm, this, &InfoHolder);
3023 InfoHolder.addUnit(NewTU);
3025 NewTU->addUInt(UnitDie, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
3026 CUNode.getLanguage());
3029 Hash.update(Identifier);
3030 // ... take the least significant 8 bytes and return those. Our MD5
3031 // implementation always returns its results in little endian, swap bytes
3033 MD5::MD5Result Result;
3035 uint64_t Signature = *reinterpret_cast<support::ulittle64_t *>(Result + 8);
3036 NewTU->setTypeSignature(Signature);
3037 if (useSplitDwarf())
3038 NewTU->setSkeleton(constructSkeletonTU(NewTU));
3040 NewTU->setType(NewTU->createTypeDIE(CTy));
3044 ? Asm->getObjFileLowering().getDwarfTypesDWOSection(Signature)
3045 : Asm->getObjFileLowering().getDwarfTypesSection(Signature));
3047 CUMap.begin()->second->addDIETypeSignature(RefDie, *NewTU);