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."),
62 GenerateODRHash("generate-odr-hash", cl::Hidden,
63 cl::desc("Add an ODR hash to external type DIEs."),
66 static cl::opt<bool> GenerateCUHash("generate-cu-hash", cl::Hidden,
67 cl::desc("Add the CU hash as the dwo_id."),
71 GenerateGnuPubSections("generate-gnu-dwarf-pub-sections", cl::Hidden,
72 cl::desc("Generate GNU-style pubnames and pubtypes"),
83 static cl::opt<DefaultOnOff>
84 DwarfAccelTables("dwarf-accel-tables", cl::Hidden,
85 cl::desc("Output prototype dwarf accelerator tables."),
86 cl::values(clEnumVal(Default, "Default for platform"),
87 clEnumVal(Enable, "Enabled"),
88 clEnumVal(Disable, "Disabled"), clEnumValEnd),
91 static cl::opt<DefaultOnOff>
92 SplitDwarf("split-dwarf", cl::Hidden,
93 cl::desc("Output DWARF5 split debug info."),
94 cl::values(clEnumVal(Default, "Default for platform"),
95 clEnumVal(Enable, "Enabled"),
96 clEnumVal(Disable, "Disabled"), clEnumValEnd),
99 static cl::opt<DefaultOnOff>
100 DwarfPubSections("generate-dwarf-pub-sections", cl::Hidden,
101 cl::desc("Generate DWARF pubnames and pubtypes sections"),
102 cl::values(clEnumVal(Default, "Default for platform"),
103 clEnumVal(Enable, "Enabled"),
104 clEnumVal(Disable, "Disabled"), clEnumValEnd),
107 static cl::opt<unsigned>
108 DwarfVersionNumber("dwarf-version", cl::Hidden,
109 cl::desc("Generate DWARF for dwarf version."),
112 static const char *const DWARFGroupName = "DWARF Emission";
113 static const char *const DbgTimerName = "DWARF Debug Writer";
115 //===----------------------------------------------------------------------===//
117 // Configuration values for initial hash set sizes (log2).
119 static const unsigned InitAbbreviationsSetSize = 9; // log2(512)
123 /// resolve - Look in the DwarfDebug map for the MDNode that
124 /// corresponds to the reference.
125 template <typename T> T DbgVariable::resolve(DIRef<T> Ref) const {
126 return DD->resolve(Ref);
129 DIType DbgVariable::getType() const {
130 DIType Ty = Var.getType();
131 // FIXME: isBlockByrefVariable should be reformulated in terms of complex
132 // addresses instead.
133 if (Var.isBlockByrefVariable()) {
134 /* Byref variables, in Blocks, are declared by the programmer as
135 "SomeType VarName;", but the compiler creates a
136 __Block_byref_x_VarName struct, and gives the variable VarName
137 either the struct, or a pointer to the struct, as its type. This
138 is necessary for various behind-the-scenes things the compiler
139 needs to do with by-reference variables in blocks.
141 However, as far as the original *programmer* is concerned, the
142 variable should still have type 'SomeType', as originally declared.
144 The following function dives into the __Block_byref_x_VarName
145 struct to find the original type of the variable. This will be
146 passed back to the code generating the type for the Debug
147 Information Entry for the variable 'VarName'. 'VarName' will then
148 have the original type 'SomeType' in its debug information.
150 The original type 'SomeType' will be the type of the field named
151 'VarName' inside the __Block_byref_x_VarName struct.
153 NOTE: In order for this to not completely fail on the debugger
154 side, the Debug Information Entry for the variable VarName needs to
155 have a DW_AT_location that tells the debugger how to unwind through
156 the pointers and __Block_byref_x_VarName struct to find the actual
157 value of the variable. The function addBlockByrefType does this. */
159 uint16_t tag = Ty.getTag();
161 if (tag == dwarf::DW_TAG_pointer_type)
162 subType = resolve(DIDerivedType(Ty).getTypeDerivedFrom());
164 DIArray Elements = DICompositeType(subType).getTypeArray();
165 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
166 DIDerivedType DT(Elements.getElement(i));
167 if (getName() == DT.getName())
168 return (resolve(DT.getTypeDerivedFrom()));
174 } // end llvm namespace
176 /// Return Dwarf Version by checking module flags.
177 static unsigned getDwarfVersionFromModule(const Module *M) {
178 Value *Val = M->getModuleFlag("Dwarf Version");
180 return dwarf::DWARF_VERSION;
181 return cast<ConstantInt>(Val)->getZExtValue();
184 DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
185 : Asm(A), MMI(Asm->MMI), FirstCU(0),
186 AbbreviationsSet(InitAbbreviationsSetSize),
187 SourceIdMap(DIEValueAllocator), PrevLabel(NULL), GlobalCUIndexCount(0),
188 GlobalRangeCount(0), InfoHolder(A, &AbbreviationsSet, Abbreviations,
189 "info_string", DIEValueAllocator),
190 SkeletonAbbrevSet(InitAbbreviationsSetSize),
191 SkeletonHolder(A, &SkeletonAbbrevSet, SkeletonAbbrevs, "skel_string",
194 DwarfInfoSectionSym = DwarfAbbrevSectionSym = 0;
195 DwarfStrSectionSym = TextSectionSym = 0;
196 DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = DwarfLineSectionSym = 0;
197 DwarfAddrSectionSym = 0;
198 DwarfAbbrevDWOSectionSym = DwarfStrDWOSectionSym = 0;
199 FunctionBeginSym = FunctionEndSym = 0;
200 CurFn = 0; CurMI = 0;
202 // Turn on accelerator tables for Darwin by default, pubnames by
203 // default for non-Darwin, and handle split dwarf.
204 bool IsDarwin = Triple(A->getTargetTriple()).isOSDarwin();
206 if (DwarfAccelTables == Default)
207 HasDwarfAccelTables = IsDarwin;
209 HasDwarfAccelTables = DwarfAccelTables == Enable;
211 if (SplitDwarf == Default)
212 HasSplitDwarf = false;
214 HasSplitDwarf = SplitDwarf == Enable;
216 if (DwarfPubSections == Default)
217 HasDwarfPubSections = !IsDarwin;
219 HasDwarfPubSections = DwarfPubSections == Enable;
221 DwarfVersion = DwarfVersionNumber
223 : getDwarfVersionFromModule(MMI->getModule());
226 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
231 // Switch to the specified MCSection and emit an assembler
232 // temporary label to it if SymbolStem is specified.
233 static MCSymbol *emitSectionSym(AsmPrinter *Asm, const MCSection *Section,
234 const char *SymbolStem = 0) {
235 Asm->OutStreamer.SwitchSection(Section);
239 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
240 Asm->OutStreamer.EmitLabel(TmpSym);
244 DwarfUnits::~DwarfUnits() {
245 for (SmallVectorImpl<Unit *>::iterator I = CUs.begin(), E = CUs.end(); I != E;
250 MCSymbol *DwarfUnits::getStringPoolSym() {
251 return Asm->GetTempSymbol(StringPref);
254 MCSymbol *DwarfUnits::getStringPoolEntry(StringRef Str) {
255 std::pair<MCSymbol *, unsigned> &Entry =
256 StringPool.GetOrCreateValue(Str).getValue();
260 Entry.second = NextStringPoolNumber++;
261 return Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
264 unsigned DwarfUnits::getStringPoolIndex(StringRef Str) {
265 std::pair<MCSymbol *, unsigned> &Entry =
266 StringPool.GetOrCreateValue(Str).getValue();
270 Entry.second = NextStringPoolNumber++;
271 Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
275 unsigned DwarfUnits::getAddrPoolIndex(const MCSymbol *Sym) {
276 return getAddrPoolIndex(MCSymbolRefExpr::Create(Sym, Asm->OutContext));
279 unsigned DwarfUnits::getAddrPoolIndex(const MCExpr *Sym) {
280 std::pair<DenseMap<const MCExpr *, unsigned>::iterator, bool> P =
281 AddressPool.insert(std::make_pair(Sym, NextAddrPoolNumber));
283 ++NextAddrPoolNumber;
284 return P.first->second;
287 // Define a unique number for the abbreviation.
289 void DwarfUnits::assignAbbrevNumber(DIEAbbrev &Abbrev) {
290 // Check the set for priors.
291 DIEAbbrev *InSet = AbbreviationsSet->GetOrInsertNode(&Abbrev);
293 // If it's newly added.
294 if (InSet == &Abbrev) {
295 // Add to abbreviation list.
296 Abbreviations.push_back(&Abbrev);
298 // Assign the vector position + 1 as its number.
299 Abbrev.setNumber(Abbreviations.size());
301 // Assign existing abbreviation number.
302 Abbrev.setNumber(InSet->getNumber());
306 static bool isObjCClass(StringRef Name) {
307 return Name.startswith("+") || Name.startswith("-");
310 static bool hasObjCCategory(StringRef Name) {
311 if (!isObjCClass(Name))
314 return Name.find(") ") != StringRef::npos;
317 static void getObjCClassCategory(StringRef In, StringRef &Class,
318 StringRef &Category) {
319 if (!hasObjCCategory(In)) {
320 Class = In.slice(In.find('[') + 1, In.find(' '));
325 Class = In.slice(In.find('[') + 1, In.find('('));
326 Category = In.slice(In.find('[') + 1, In.find(' '));
330 static StringRef getObjCMethodName(StringRef In) {
331 return In.slice(In.find(' ') + 1, In.find(']'));
334 // Helper for sorting sections into a stable output order.
335 static bool SectionSort(const MCSection *A, const MCSection *B) {
336 std::string LA = (A ? A->getLabelBeginName() : "");
337 std::string LB = (B ? B->getLabelBeginName() : "");
341 // Add the various names to the Dwarf accelerator table names.
342 // TODO: Determine whether or not we should add names for programs
343 // that do not have a DW_AT_name or DW_AT_linkage_name field - this
344 // is only slightly different than the lookup of non-standard ObjC names.
345 static void addSubprogramNames(Unit *TheU, DISubprogram SP, DIE *Die) {
346 if (!SP.isDefinition())
348 TheU->addAccelName(SP.getName(), Die);
350 // If the linkage name is different than the name, go ahead and output
351 // that as well into the name table.
352 if (SP.getLinkageName() != "" && SP.getName() != SP.getLinkageName())
353 TheU->addAccelName(SP.getLinkageName(), Die);
355 // If this is an Objective-C selector name add it to the ObjC accelerator
357 if (isObjCClass(SP.getName())) {
358 StringRef Class, Category;
359 getObjCClassCategory(SP.getName(), Class, Category);
360 TheU->addAccelObjC(Class, Die);
362 TheU->addAccelObjC(Category, Die);
363 // Also add the base method name to the name table.
364 TheU->addAccelName(getObjCMethodName(SP.getName()), Die);
368 /// isSubprogramContext - Return true if Context is either a subprogram
369 /// or another context nested inside a subprogram.
370 bool DwarfDebug::isSubprogramContext(const MDNode *Context) {
373 DIDescriptor D(Context);
374 if (D.isSubprogram())
377 return isSubprogramContext(resolve(DIType(Context).getContext()));
381 // Find DIE for the given subprogram and attach appropriate DW_AT_low_pc
382 // and DW_AT_high_pc attributes. If there are global variables in this
383 // scope then create and insert DIEs for these variables.
384 DIE *DwarfDebug::updateSubprogramScopeDIE(CompileUnit *SPCU, DISubprogram SP) {
385 DIE *SPDie = SPCU->getDIE(SP);
387 assert(SPDie && "Unable to find subprogram DIE!");
389 // If we're updating an abstract DIE, then we will be adding the children and
390 // object pointer later on. But what we don't want to do is process the
391 // concrete DIE twice.
392 if (DIE *AbsSPDIE = AbstractSPDies.lookup(SP)) {
393 // Pick up abstract subprogram DIE.
395 SPCU->createAndAddDIE(dwarf::DW_TAG_subprogram, *SPCU->getUnitDie());
396 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_abstract_origin, AbsSPDIE);
398 DISubprogram SPDecl = SP.getFunctionDeclaration();
399 if (!SPDecl.isSubprogram()) {
400 // There is not any need to generate specification DIE for a function
401 // defined at compile unit level. If a function is defined inside another
402 // function then gdb prefers the definition at top level and but does not
403 // expect specification DIE in parent function. So avoid creating
404 // specification DIE for a function defined inside a function.
405 DIScope SPContext = resolve(SP.getContext());
406 if (SP.isDefinition() && !SPContext.isCompileUnit() &&
407 !SPContext.isFile() && !isSubprogramContext(SPContext)) {
408 SPCU->addFlag(SPDie, dwarf::DW_AT_declaration);
411 DICompositeType SPTy = SP.getType();
412 DIArray Args = SPTy.getTypeArray();
413 uint16_t SPTag = SPTy.getTag();
414 if (SPTag == dwarf::DW_TAG_subroutine_type)
415 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
417 SPCU->createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
418 DIType ATy(Args.getElement(i));
419 SPCU->addType(Arg, ATy);
420 if (ATy.isArtificial())
421 SPCU->addFlag(Arg, dwarf::DW_AT_artificial);
422 if (ATy.isObjectPointer())
423 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_object_pointer, Arg);
425 DIE *SPDeclDie = SPDie;
426 SPDie = SPCU->createAndAddDIE(dwarf::DW_TAG_subprogram,
427 *SPCU->getUnitDie());
428 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification, SPDeclDie);
433 SPCU->addLabelAddress(SPDie, dwarf::DW_AT_low_pc, FunctionBeginSym);
434 SPCU->addLabelAddress(SPDie, dwarf::DW_AT_high_pc, FunctionEndSym);
436 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
437 MachineLocation Location(RI->getFrameRegister(*Asm->MF));
438 SPCU->addAddress(SPDie, dwarf::DW_AT_frame_base, Location);
440 // Add name to the name table, we do this here because we're guaranteed
441 // to have concrete versions of our DW_TAG_subprogram nodes.
442 addSubprogramNames(SPCU, SP, SPDie);
447 /// Check whether we should create a DIE for the given Scope, return true
448 /// if we don't create a DIE (the corresponding DIE is null).
449 bool DwarfDebug::isLexicalScopeDIENull(LexicalScope *Scope) {
450 if (Scope->isAbstractScope())
453 // We don't create a DIE if there is no Range.
454 const SmallVectorImpl<InsnRange> &Ranges = Scope->getRanges();
458 if (Ranges.size() > 1)
461 // We don't create a DIE if we have a single Range and the end label
463 SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin();
464 MCSymbol *End = getLabelAfterInsn(RI->second);
468 void DwarfDebug::addScopeRangeList(CompileUnit *TheCU, DIE *ScopeDIE,
469 const SmallVectorImpl<InsnRange> &Range) {
470 // Emit offset in .debug_range as a relocatable label. emitDIE will handle
471 // emitting it appropriately.
472 MCSymbol *RangeSym = Asm->GetTempSymbol("debug_ranges", GlobalRangeCount++);
473 TheCU->addSectionLabel(ScopeDIE, dwarf::DW_AT_ranges, RangeSym);
474 RangeSpanList List(RangeSym);
475 for (SmallVectorImpl<InsnRange>::const_iterator RI = Range.begin(),
478 RangeSpan Span(getLabelBeforeInsn(RI->first),
479 getLabelAfterInsn(RI->second));
480 List.addRange(llvm_move(Span));
483 // Add the range list to the set of ranges to be emitted.
484 TheCU->addRangeList(llvm_move(List));
487 // Construct new DW_TAG_lexical_block for this scope and attach
488 // DW_AT_low_pc/DW_AT_high_pc labels.
489 DIE *DwarfDebug::constructLexicalScopeDIE(CompileUnit *TheCU,
490 LexicalScope *Scope) {
491 if (isLexicalScopeDIENull(Scope))
494 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_lexical_block);
495 if (Scope->isAbstractScope())
498 const SmallVectorImpl<InsnRange> &ScopeRanges = Scope->getRanges();
500 // If we have multiple ranges, emit them into the range section.
501 if (ScopeRanges.size() > 1) {
502 addScopeRangeList(TheCU, ScopeDIE, ScopeRanges);
506 // Construct the address range for this DIE.
507 SmallVectorImpl<InsnRange>::const_iterator RI = ScopeRanges.begin();
508 MCSymbol *Start = getLabelBeforeInsn(RI->first);
509 MCSymbol *End = getLabelAfterInsn(RI->second);
510 assert(End && "End label should not be null!");
512 assert(Start->isDefined() && "Invalid starting label for an inlined scope!");
513 assert(End->isDefined() && "Invalid end label for an inlined scope!");
515 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_low_pc, Start);
516 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_high_pc, End);
521 // This scope represents inlined body of a function. Construct DIE to
522 // represent this concrete inlined copy of the function.
523 DIE *DwarfDebug::constructInlinedScopeDIE(CompileUnit *TheCU,
524 LexicalScope *Scope) {
525 const SmallVectorImpl<InsnRange> &ScopeRanges = Scope->getRanges();
526 assert(!ScopeRanges.empty() &&
527 "LexicalScope does not have instruction markers!");
529 if (!Scope->getScopeNode())
531 DIScope DS(Scope->getScopeNode());
532 DISubprogram InlinedSP = getDISubprogram(DS);
533 DIE *OriginDIE = TheCU->getDIE(InlinedSP);
535 DEBUG(dbgs() << "Unable to find original DIE for an inlined subprogram.");
539 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine);
540 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin, OriginDIE);
542 // If we have multiple ranges, emit them into the range section.
543 if (ScopeRanges.size() > 1)
544 addScopeRangeList(TheCU, ScopeDIE, ScopeRanges);
546 SmallVectorImpl<InsnRange>::const_iterator RI = ScopeRanges.begin();
547 MCSymbol *StartLabel = getLabelBeforeInsn(RI->first);
548 MCSymbol *EndLabel = getLabelAfterInsn(RI->second);
550 if (StartLabel == 0 || EndLabel == 0)
551 llvm_unreachable("Unexpected Start and End labels for an inlined scope!");
553 assert(StartLabel->isDefined() &&
554 "Invalid starting label for an inlined scope!");
555 assert(EndLabel->isDefined() && "Invalid end label for an inlined scope!");
557 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_low_pc, StartLabel);
558 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_high_pc, EndLabel);
561 InlinedSubprogramDIEs.insert(OriginDIE);
563 // Add the call site information to the DIE.
564 DILocation DL(Scope->getInlinedAt());
565 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_file, None,
566 getOrCreateSourceID(DL.getFilename(), DL.getDirectory(),
567 TheCU->getUniqueID()));
568 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_line, None, DL.getLineNumber());
570 // Add name to the name table, we do this here because we're guaranteed
571 // to have concrete versions of our DW_TAG_inlined_subprogram nodes.
572 addSubprogramNames(TheCU, InlinedSP, ScopeDIE);
577 DIE *DwarfDebug::createScopeChildrenDIE(CompileUnit *TheCU, LexicalScope *Scope,
578 SmallVectorImpl<DIE *> &Children) {
579 DIE *ObjectPointer = NULL;
581 // Collect arguments for current function.
582 if (LScopes.isCurrentFunctionScope(Scope))
583 for (unsigned i = 0, N = CurrentFnArguments.size(); i < N; ++i)
584 if (DbgVariable *ArgDV = CurrentFnArguments[i])
586 TheCU->constructVariableDIE(*ArgDV, Scope->isAbstractScope())) {
587 Children.push_back(Arg);
588 if (ArgDV->isObjectPointer())
592 // Collect lexical scope children first.
593 const SmallVectorImpl<DbgVariable *> &Variables =
594 ScopeVariables.lookup(Scope);
595 for (unsigned i = 0, N = Variables.size(); i < N; ++i)
596 if (DIE *Variable = TheCU->constructVariableDIE(*Variables[i],
597 Scope->isAbstractScope())) {
598 Children.push_back(Variable);
599 if (Variables[i]->isObjectPointer())
600 ObjectPointer = Variable;
602 const SmallVectorImpl<LexicalScope *> &Scopes = Scope->getChildren();
603 for (unsigned j = 0, M = Scopes.size(); j < M; ++j)
604 if (DIE *Nested = constructScopeDIE(TheCU, Scopes[j]))
605 Children.push_back(Nested);
606 return ObjectPointer;
609 // Construct a DIE for this scope.
610 DIE *DwarfDebug::constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope) {
611 if (!Scope || !Scope->getScopeNode())
614 DIScope DS(Scope->getScopeNode());
616 SmallVector<DIE *, 8> Children;
617 DIE *ObjectPointer = NULL;
618 bool ChildrenCreated = false;
620 // We try to create the scope DIE first, then the children DIEs. This will
621 // avoid creating un-used children then removing them later when we find out
622 // the scope DIE is null.
623 DIE *ScopeDIE = NULL;
624 if (Scope->getInlinedAt())
625 ScopeDIE = constructInlinedScopeDIE(TheCU, Scope);
626 else if (DS.isSubprogram()) {
627 ProcessedSPNodes.insert(DS);
628 if (Scope->isAbstractScope()) {
629 ScopeDIE = TheCU->getDIE(DS);
630 // Note down abstract DIE.
632 AbstractSPDies.insert(std::make_pair(DS, ScopeDIE));
634 ScopeDIE = updateSubprogramScopeDIE(TheCU, DISubprogram(DS));
636 // Early exit when we know the scope DIE is going to be null.
637 if (isLexicalScopeDIENull(Scope))
640 // We create children here when we know the scope DIE is not going to be
641 // null and the children will be added to the scope DIE.
642 ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
643 ChildrenCreated = true;
645 // There is no need to emit empty lexical block DIE.
646 std::pair<ImportedEntityMap::const_iterator,
647 ImportedEntityMap::const_iterator> Range =
649 ScopesWithImportedEntities.begin(),
650 ScopesWithImportedEntities.end(),
651 std::pair<const MDNode *, const MDNode *>(DS, (const MDNode *)0),
653 if (Children.empty() && Range.first == Range.second)
655 ScopeDIE = constructLexicalScopeDIE(TheCU, Scope);
656 assert(ScopeDIE && "Scope DIE should not be null.");
657 for (ImportedEntityMap::const_iterator i = Range.first; i != Range.second;
659 constructImportedEntityDIE(TheCU, i->second, ScopeDIE);
663 assert(Children.empty() &&
664 "We create children only when the scope DIE is not null.");
667 if (!ChildrenCreated)
668 // We create children when the scope DIE is not null.
669 ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
672 for (SmallVectorImpl<DIE *>::iterator I = Children.begin(),
675 ScopeDIE->addChild(*I);
677 if (DS.isSubprogram() && ObjectPointer != NULL)
678 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, ObjectPointer);
683 // Look up the source id with the given directory and source file names.
684 // If none currently exists, create a new id and insert it in the
685 // SourceIds map. This can update DirectoryNames and SourceFileNames maps
687 unsigned DwarfDebug::getOrCreateSourceID(StringRef FileName, StringRef DirName,
689 // If we use .loc in assembly, we can't separate .file entries according to
690 // compile units. Thus all files will belong to the default compile unit.
692 // FIXME: add a better feature test than hasRawTextSupport. Even better,
693 // extend .file to support this.
694 if (Asm->TM.hasMCUseLoc() && Asm->OutStreamer.hasRawTextSupport())
697 // If FE did not provide a file name, then assume stdin.
698 if (FileName.empty())
699 return getOrCreateSourceID("<stdin>", StringRef(), CUID);
701 // TODO: this might not belong here. See if we can factor this better.
702 if (DirName == CompilationDir)
705 // FileIDCUMap stores the current ID for the given compile unit.
706 unsigned SrcId = FileIDCUMap[CUID] + 1;
708 // We look up the CUID/file/dir by concatenating them with a zero byte.
709 SmallString<128> NamePair;
710 NamePair += utostr(CUID);
713 NamePair += '\0'; // Zero bytes are not allowed in paths.
714 NamePair += FileName;
716 StringMapEntry<unsigned> &Ent = SourceIdMap.GetOrCreateValue(NamePair, SrcId);
717 if (Ent.getValue() != SrcId)
718 return Ent.getValue();
720 FileIDCUMap[CUID] = SrcId;
721 // Print out a .file directive to specify files for .loc directives.
722 Asm->OutStreamer.EmitDwarfFileDirective(SrcId, DirName, FileName, CUID);
727 static void addSectionLabel(AsmPrinter *Asm, Unit *U, DIE *D,
728 dwarf::Attribute A, const MCSymbol *L,
729 const MCSymbol *Sec) {
730 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
731 U->addSectionLabel(D, A, L);
733 U->addSectionDelta(D, A, L, Sec);
736 void DwarfDebug::addGnuPubAttributes(Unit *U, DIE *D) const {
737 if (!GenerateGnuPubSections)
740 addSectionLabel(Asm, U, D, dwarf::DW_AT_GNU_pubnames,
741 Asm->GetTempSymbol("gnu_pubnames", U->getUniqueID()),
742 DwarfGnuPubNamesSectionSym);
744 addSectionLabel(Asm, U, D, dwarf::DW_AT_GNU_pubtypes,
745 Asm->GetTempSymbol("gnu_pubtypes", U->getUniqueID()),
746 DwarfGnuPubTypesSectionSym);
749 // Create new CompileUnit for the given metadata node with tag
750 // DW_TAG_compile_unit.
751 CompileUnit *DwarfDebug::constructCompileUnit(DICompileUnit DIUnit) {
752 StringRef FN = DIUnit.getFilename();
753 CompilationDir = DIUnit.getDirectory();
755 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
756 CompileUnit *NewCU = new CompileUnit(GlobalCUIndexCount++, Die, DIUnit, Asm,
759 FileIDCUMap[NewCU->getUniqueID()] = 0;
760 // Call this to emit a .file directive if it wasn't emitted for the source
761 // file this CU comes from yet.
762 getOrCreateSourceID(FN, CompilationDir, NewCU->getUniqueID());
764 NewCU->addString(Die, dwarf::DW_AT_producer, DIUnit.getProducer());
765 NewCU->addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
766 DIUnit.getLanguage());
767 NewCU->addString(Die, dwarf::DW_AT_name, FN);
769 // 2.17.1 requires that we use DW_AT_low_pc for a single entry point
770 // into an entity. We're using 0 (or a NULL label) for this. For
771 // split dwarf it's in the skeleton CU so omit it here.
772 if (!useSplitDwarf())
773 NewCU->addLabelAddress(Die, dwarf::DW_AT_low_pc, NULL);
775 // Define start line table label for each Compile Unit.
776 MCSymbol *LineTableStartSym =
777 Asm->GetTempSymbol("line_table_start", NewCU->getUniqueID());
778 Asm->OutStreamer.getContext().setMCLineTableSymbol(LineTableStartSym,
779 NewCU->getUniqueID());
781 // Use a single line table if we are using .loc and generating assembly.
783 (Asm->TM.hasMCUseLoc() && Asm->OutStreamer.hasRawTextSupport()) ||
784 (NewCU->getUniqueID() == 0);
786 if (!useSplitDwarf()) {
787 // DW_AT_stmt_list is a offset of line number information for this
788 // compile unit in debug_line section. For split dwarf this is
789 // left in the skeleton CU and so not included.
790 // The line table entries are not always emitted in assembly, so it
791 // is not okay to use line_table_start here.
792 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
793 NewCU->addSectionLabel(
794 Die, dwarf::DW_AT_stmt_list,
795 UseTheFirstCU ? Asm->GetTempSymbol("section_line")
796 : LineTableStartSym);
797 else if (UseTheFirstCU)
798 NewCU->addSectionOffset(Die, dwarf::DW_AT_stmt_list, 0);
800 NewCU->addSectionDelta(Die, dwarf::DW_AT_stmt_list,
801 LineTableStartSym, DwarfLineSectionSym);
803 // If we're using split dwarf the compilation dir is going to be in the
804 // skeleton CU and so we don't need to duplicate it here.
805 if (!CompilationDir.empty())
806 NewCU->addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
808 addGnuPubAttributes(NewCU, Die);
811 if (DIUnit.isOptimized())
812 NewCU->addFlag(Die, dwarf::DW_AT_APPLE_optimized);
814 StringRef Flags = DIUnit.getFlags();
816 NewCU->addString(Die, dwarf::DW_AT_APPLE_flags, Flags);
818 if (unsigned RVer = DIUnit.getRunTimeVersion())
819 NewCU->addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
820 dwarf::DW_FORM_data1, RVer);
825 InfoHolder.addUnit(NewCU);
827 CUMap.insert(std::make_pair(DIUnit, NewCU));
828 CUDieMap.insert(std::make_pair(Die, NewCU));
832 // Construct subprogram DIE.
833 void DwarfDebug::constructSubprogramDIE(CompileUnit *TheCU, const MDNode *N) {
834 // FIXME: We should only call this routine once, however, during LTO if a
835 // program is defined in multiple CUs we could end up calling it out of
836 // beginModule as we walk the CUs.
838 CompileUnit *&CURef = SPMap[N];
844 if (!SP.isDefinition())
845 // This is a method declaration which will be handled while constructing
849 DIE *SubprogramDie = TheCU->getOrCreateSubprogramDIE(SP);
851 // Expose as a global name.
852 TheCU->addGlobalName(SP.getName(), SubprogramDie, resolve(SP.getContext()));
855 void DwarfDebug::constructImportedEntityDIE(CompileUnit *TheCU,
857 DIImportedEntity Module(N);
858 if (!Module.Verify())
860 if (DIE *D = TheCU->getOrCreateContextDIE(Module.getContext()))
861 constructImportedEntityDIE(TheCU, Module, D);
864 void DwarfDebug::constructImportedEntityDIE(CompileUnit *TheCU, const MDNode *N,
866 DIImportedEntity Module(N);
867 if (!Module.Verify())
869 return constructImportedEntityDIE(TheCU, Module, Context);
872 void DwarfDebug::constructImportedEntityDIE(CompileUnit *TheCU,
873 const DIImportedEntity &Module,
875 assert(Module.Verify() &&
876 "Use one of the MDNode * overloads to handle invalid metadata");
877 assert(Context && "Should always have a context for an imported_module");
878 DIE *IMDie = new DIE(Module.getTag());
879 TheCU->insertDIE(Module, IMDie);
881 DIDescriptor Entity = Module.getEntity();
882 if (Entity.isNameSpace())
883 EntityDie = TheCU->getOrCreateNameSpace(DINameSpace(Entity));
884 else if (Entity.isSubprogram())
885 EntityDie = TheCU->getOrCreateSubprogramDIE(DISubprogram(Entity));
886 else if (Entity.isType())
887 EntityDie = TheCU->getOrCreateTypeDIE(DIType(Entity));
889 EntityDie = TheCU->getDIE(Entity);
890 unsigned FileID = getOrCreateSourceID(Module.getContext().getFilename(),
891 Module.getContext().getDirectory(),
892 TheCU->getUniqueID());
893 TheCU->addUInt(IMDie, dwarf::DW_AT_decl_file, None, FileID);
894 TheCU->addUInt(IMDie, dwarf::DW_AT_decl_line, None, Module.getLineNumber());
895 TheCU->addDIEEntry(IMDie, dwarf::DW_AT_import, EntityDie);
896 StringRef Name = Module.getName();
898 TheCU->addString(IMDie, dwarf::DW_AT_name, Name);
899 Context->addChild(IMDie);
902 // Emit all Dwarf sections that should come prior to the content. Create
903 // global DIEs and emit initial debug info sections. This is invoked by
904 // the target AsmPrinter.
905 void DwarfDebug::beginModule() {
906 if (DisableDebugInfoPrinting)
909 const Module *M = MMI->getModule();
911 // If module has named metadata anchors then use them, otherwise scan the
912 // module using debug info finder to collect debug info.
913 NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
916 TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
918 // Emit initial sections so we can reference labels later.
921 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
922 DICompileUnit CUNode(CU_Nodes->getOperand(i));
923 CompileUnit *CU = constructCompileUnit(CUNode);
924 DIArray ImportedEntities = CUNode.getImportedEntities();
925 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
926 ScopesWithImportedEntities.push_back(std::make_pair(
927 DIImportedEntity(ImportedEntities.getElement(i)).getContext(),
928 ImportedEntities.getElement(i)));
929 std::sort(ScopesWithImportedEntities.begin(),
930 ScopesWithImportedEntities.end(), less_first());
931 DIArray GVs = CUNode.getGlobalVariables();
932 for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i)
933 CU->createGlobalVariableDIE(DIGlobalVariable(GVs.getElement(i)));
934 DIArray SPs = CUNode.getSubprograms();
935 for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
936 constructSubprogramDIE(CU, SPs.getElement(i));
937 DIArray EnumTypes = CUNode.getEnumTypes();
938 for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i)
939 CU->getOrCreateTypeDIE(EnumTypes.getElement(i));
940 DIArray RetainedTypes = CUNode.getRetainedTypes();
941 for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i)
942 CU->getOrCreateTypeDIE(RetainedTypes.getElement(i));
943 // Emit imported_modules last so that the relevant context is already
945 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
946 constructImportedEntityDIE(CU, ImportedEntities.getElement(i));
949 // Tell MMI that we have debug info.
950 MMI->setDebugInfoAvailability(true);
952 // Prime section data.
953 SectionMap[Asm->getObjFileLowering().getTextSection()];
956 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
957 void DwarfDebug::computeInlinedDIEs() {
958 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
959 for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(),
960 AE = InlinedSubprogramDIEs.end();
963 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
965 for (DenseMap<const MDNode *, DIE *>::iterator AI = AbstractSPDies.begin(),
966 AE = AbstractSPDies.end();
968 DIE *ISP = AI->second;
969 if (InlinedSubprogramDIEs.count(ISP))
971 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
975 // Collect info for variables that were optimized out.
976 void DwarfDebug::collectDeadVariables() {
977 const Module *M = MMI->getModule();
979 if (NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu")) {
980 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
981 DICompileUnit TheCU(CU_Nodes->getOperand(i));
982 DIArray Subprograms = TheCU.getSubprograms();
983 for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
984 DISubprogram SP(Subprograms.getElement(i));
985 if (ProcessedSPNodes.count(SP) != 0)
987 if (!SP.isSubprogram())
989 if (!SP.isDefinition())
991 DIArray Variables = SP.getVariables();
992 if (Variables.getNumElements() == 0)
995 // Construct subprogram DIE and add variables DIEs.
996 CompileUnit *SPCU = static_cast<CompileUnit *>(CUMap.lookup(TheCU));
997 assert(SPCU && "Unable to find Compile Unit!");
998 // FIXME: See the comment in constructSubprogramDIE about duplicate
1000 constructSubprogramDIE(SPCU, SP);
1001 DIE *SPDIE = SPCU->getDIE(SP);
1002 for (unsigned vi = 0, ve = Variables.getNumElements(); vi != ve; ++vi) {
1003 DIVariable DV(Variables.getElement(vi));
1004 if (!DV.isVariable())
1006 DbgVariable NewVar(DV, NULL, this);
1007 if (DIE *VariableDIE = SPCU->constructVariableDIE(NewVar, false))
1008 SPDIE->addChild(VariableDIE);
1015 // Type Signature [7.27] and ODR Hash code.
1017 /// \brief Grabs the string in whichever attribute is passed in and returns
1018 /// a reference to it. Returns "" if the attribute doesn't exist.
1019 static StringRef getDIEStringAttr(DIE *Die, unsigned Attr) {
1020 DIEValue *V = Die->findAttribute(Attr);
1022 if (DIEString *S = dyn_cast_or_null<DIEString>(V))
1023 return S->getString();
1025 return StringRef("");
1028 /// Return true if the current DIE is contained within an anonymous namespace.
1029 static bool isContainedInAnonNamespace(DIE *Die) {
1030 DIE *Parent = Die->getParent();
1033 if (Parent->getTag() == dwarf::DW_TAG_namespace &&
1034 getDIEStringAttr(Parent, dwarf::DW_AT_name) == "")
1036 Parent = Parent->getParent();
1042 /// Test if the current CU language is C++ and that we have
1043 /// a named type that is not contained in an anonymous namespace.
1044 static bool shouldAddODRHash(TypeUnit *CU, DIE *Die) {
1045 return CU->getLanguage() == dwarf::DW_LANG_C_plus_plus &&
1046 getDIEStringAttr(Die, dwarf::DW_AT_name) != "" &&
1047 !isContainedInAnonNamespace(Die);
1050 void DwarfDebug::finalizeModuleInfo() {
1051 // Collect info for variables that were optimized out.
1052 collectDeadVariables();
1054 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
1055 computeInlinedDIEs();
1057 // Handle anything that needs to be done on a per-unit basis after
1058 // all other generation.
1059 for (SmallVectorImpl<Unit *>::const_iterator I = getUnits().begin(),
1060 E = getUnits().end();
1063 // Emit DW_AT_containing_type attribute to connect types with their
1064 // vtable holding type.
1065 TheU->constructContainingTypeDIEs();
1067 // If we're splitting the dwarf out now that we've got the entire
1068 // CU then construct a skeleton CU based upon it.
1069 if (useSplitDwarf() &&
1070 TheU->getUnitDie()->getTag() == dwarf::DW_TAG_compile_unit) {
1072 if (GenerateCUHash) {
1074 ID = CUHash.computeCUSignature(*TheU->getUnitDie());
1076 // This should be a unique identifier when we want to build .dwp files.
1077 TheU->addUInt(TheU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
1078 dwarf::DW_FORM_data8, ID);
1079 // Now construct the skeleton CU associated.
1080 CompileUnit *SkCU = constructSkeletonCU(static_cast<CompileUnit *>(TheU));
1081 // This should be a unique identifier when we want to build .dwp files.
1082 SkCU->addUInt(SkCU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
1083 dwarf::DW_FORM_data8, ID);
1087 // Compute DIE offsets and sizes.
1088 InfoHolder.computeSizeAndOffsets();
1089 if (useSplitDwarf())
1090 SkeletonHolder.computeSizeAndOffsets();
1093 void DwarfDebug::endSections() {
1094 // Filter labels by section.
1095 for (size_t n = 0; n < ArangeLabels.size(); n++) {
1096 const SymbolCU &SCU = ArangeLabels[n];
1097 if (SCU.Sym->isInSection()) {
1098 // Make a note of this symbol and it's section.
1099 const MCSection *Section = &SCU.Sym->getSection();
1100 if (!Section->getKind().isMetadata())
1101 SectionMap[Section].push_back(SCU);
1103 // Some symbols (e.g. common/bss on mach-o) can have no section but still
1104 // appear in the output. This sucks as we rely on sections to build
1105 // arange spans. We can do it without, but it's icky.
1106 SectionMap[NULL].push_back(SCU);
1110 // Build a list of sections used.
1111 std::vector<const MCSection *> Sections;
1112 for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
1114 const MCSection *Section = it->first;
1115 Sections.push_back(Section);
1118 // Sort the sections into order.
1119 // This is only done to ensure consistent output order across different runs.
1120 std::sort(Sections.begin(), Sections.end(), SectionSort);
1122 // Add terminating symbols for each section.
1123 for (unsigned ID = 0; ID < Sections.size(); ID++) {
1124 const MCSection *Section = Sections[ID];
1125 MCSymbol *Sym = NULL;
1128 // We can't call MCSection::getLabelEndName, as it's only safe to do so
1129 // if we know the section name up-front. For user-created sections, the
1131 // label may not be valid to use as a label. (section names can use a
1133 // set of characters on some systems)
1134 Sym = Asm->GetTempSymbol("debug_end", ID);
1135 Asm->OutStreamer.SwitchSection(Section);
1136 Asm->OutStreamer.EmitLabel(Sym);
1139 // Insert a final terminator.
1140 SectionMap[Section].push_back(SymbolCU(NULL, Sym));
1144 // Emit all Dwarf sections that should come after the content.
1145 void DwarfDebug::endModule() {
1152 // End any existing sections.
1153 // TODO: Does this need to happen?
1156 // Finalize the debug info for the module.
1157 finalizeModuleInfo();
1161 // Emit all the DIEs into a debug info section.
1164 // Corresponding abbreviations into a abbrev section.
1165 emitAbbreviations();
1167 // Emit info into a debug loc section.
1170 // Emit info into a debug aranges section.
1173 // Emit info into a debug ranges section.
1176 // Emit info into a debug macinfo section.
1179 if (useSplitDwarf()) {
1182 emitDebugAbbrevDWO();
1183 // Emit DWO addresses.
1184 InfoHolder.emitAddresses(Asm->getObjFileLowering().getDwarfAddrSection());
1187 // Emit info into the dwarf accelerator table sections.
1188 if (useDwarfAccelTables()) {
1191 emitAccelNamespaces();
1195 // Emit the pubnames and pubtypes sections if requested.
1196 if (HasDwarfPubSections) {
1197 emitDebugPubNames(GenerateGnuPubSections);
1198 emitDebugPubTypes(GenerateGnuPubSections);
1204 // Reset these for the next Module if we have one.
1208 // Find abstract variable, if any, associated with Var.
1209 DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &DV,
1210 DebugLoc ScopeLoc) {
1211 LLVMContext &Ctx = DV->getContext();
1212 // More then one inlined variable corresponds to one abstract variable.
1213 DIVariable Var = cleanseInlinedVariable(DV, Ctx);
1214 DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var);
1216 return AbsDbgVariable;
1218 LexicalScope *Scope = LScopes.findAbstractScope(ScopeLoc.getScope(Ctx));
1222 AbsDbgVariable = new DbgVariable(Var, NULL, this);
1223 addScopeVariable(Scope, AbsDbgVariable);
1224 AbstractVariables[Var] = AbsDbgVariable;
1225 return AbsDbgVariable;
1228 // If Var is a current function argument then add it to CurrentFnArguments list.
1229 bool DwarfDebug::addCurrentFnArgument(DbgVariable *Var, LexicalScope *Scope) {
1230 if (!LScopes.isCurrentFunctionScope(Scope))
1232 DIVariable DV = Var->getVariable();
1233 if (DV.getTag() != dwarf::DW_TAG_arg_variable)
1235 unsigned ArgNo = DV.getArgNumber();
1239 size_t Size = CurrentFnArguments.size();
1241 CurrentFnArguments.resize(CurFn->getFunction()->arg_size());
1242 // llvm::Function argument size is not good indicator of how many
1243 // arguments does the function have at source level.
1245 CurrentFnArguments.resize(ArgNo * 2);
1246 CurrentFnArguments[ArgNo - 1] = Var;
1250 // Collect variable information from side table maintained by MMI.
1251 void DwarfDebug::collectVariableInfoFromMMITable(
1252 SmallPtrSet<const MDNode *, 16> &Processed) {
1253 MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
1254 for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
1257 const MDNode *Var = VI->first;
1260 Processed.insert(Var);
1262 const std::pair<unsigned, DebugLoc> &VP = VI->second;
1264 LexicalScope *Scope = LScopes.findLexicalScope(VP.second);
1266 // If variable scope is not found then skip this variable.
1270 DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
1271 DbgVariable *RegVar = new DbgVariable(DV, AbsDbgVariable, this);
1272 RegVar->setFrameIndex(VP.first);
1273 if (!addCurrentFnArgument(RegVar, Scope))
1274 addScopeVariable(Scope, RegVar);
1276 AbsDbgVariable->setFrameIndex(VP.first);
1280 // Return true if debug value, encoded by DBG_VALUE instruction, is in a
1282 static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
1283 assert(MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
1284 return MI->getNumOperands() == 3 && MI->getOperand(0).isReg() &&
1285 MI->getOperand(0).getReg() &&
1286 (MI->getOperand(1).isImm() ||
1287 (MI->getOperand(1).isReg() && MI->getOperand(1).getReg() == 0U));
1290 // Get .debug_loc entry for the instruction range starting at MI.
1291 static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
1292 const MCSymbol *FLabel,
1293 const MCSymbol *SLabel,
1294 const MachineInstr *MI) {
1295 const MDNode *Var = MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1297 assert(MI->getNumOperands() == 3);
1298 if (MI->getOperand(0).isReg()) {
1299 MachineLocation MLoc;
1300 // If the second operand is an immediate, this is a
1301 // register-indirect address.
1302 if (!MI->getOperand(1).isImm())
1303 MLoc.set(MI->getOperand(0).getReg());
1305 MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
1306 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1308 if (MI->getOperand(0).isImm())
1309 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getImm());
1310 if (MI->getOperand(0).isFPImm())
1311 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getFPImm());
1312 if (MI->getOperand(0).isCImm())
1313 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getCImm());
1315 llvm_unreachable("Unexpected 3 operand DBG_VALUE instruction!");
1318 // Find variables for each lexical scope.
1320 DwarfDebug::collectVariableInfo(SmallPtrSet<const MDNode *, 16> &Processed) {
1322 // Grab the variable info that was squirreled away in the MMI side-table.
1323 collectVariableInfoFromMMITable(Processed);
1325 for (SmallVectorImpl<const MDNode *>::const_iterator
1326 UVI = UserVariables.begin(),
1327 UVE = UserVariables.end();
1328 UVI != UVE; ++UVI) {
1329 const MDNode *Var = *UVI;
1330 if (Processed.count(Var))
1333 // History contains relevant DBG_VALUE instructions for Var and instructions
1335 SmallVectorImpl<const MachineInstr *> &History = DbgValues[Var];
1336 if (History.empty())
1338 const MachineInstr *MInsn = History.front();
1341 LexicalScope *Scope = NULL;
1342 if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
1343 DISubprogram(DV.getContext()).describes(CurFn->getFunction()))
1344 Scope = LScopes.getCurrentFunctionScope();
1345 else if (MDNode *IA = DV.getInlinedAt())
1346 Scope = LScopes.findInlinedScope(DebugLoc::getFromDILocation(IA));
1348 Scope = LScopes.findLexicalScope(cast<MDNode>(DV->getOperand(1)));
1349 // If variable scope is not found then skip this variable.
1353 Processed.insert(DV);
1354 assert(MInsn->isDebugValue() && "History must begin with debug value");
1355 DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc());
1356 DbgVariable *RegVar = new DbgVariable(DV, AbsVar, this);
1357 if (!addCurrentFnArgument(RegVar, Scope))
1358 addScopeVariable(Scope, RegVar);
1360 AbsVar->setMInsn(MInsn);
1362 // Simplify ranges that are fully coalesced.
1363 if (History.size() <= 1 ||
1364 (History.size() == 2 && MInsn->isIdenticalTo(History.back()))) {
1365 RegVar->setMInsn(MInsn);
1369 // Handle multiple DBG_VALUE instructions describing one variable.
1370 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1372 for (SmallVectorImpl<const MachineInstr *>::const_iterator
1373 HI = History.begin(),
1376 const MachineInstr *Begin = *HI;
1377 assert(Begin->isDebugValue() && "Invalid History entry");
1379 // Check if DBG_VALUE is truncating a range.
1380 if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg() &&
1381 !Begin->getOperand(0).getReg())
1384 // Compute the range for a register location.
1385 const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
1386 const MCSymbol *SLabel = 0;
1389 // If Begin is the last instruction in History then its value is valid
1390 // until the end of the function.
1391 SLabel = FunctionEndSym;
1393 const MachineInstr *End = HI[1];
1394 DEBUG(dbgs() << "DotDebugLoc Pair:\n"
1395 << "\t" << *Begin << "\t" << *End << "\n");
1396 if (End->isDebugValue())
1397 SLabel = getLabelBeforeInsn(End);
1399 // End is a normal instruction clobbering the range.
1400 SLabel = getLabelAfterInsn(End);
1401 assert(SLabel && "Forgot label after clobber instruction");
1406 // The value is valid until the next DBG_VALUE or clobber.
1407 DotDebugLocEntries.push_back(
1408 getDebugLocEntry(Asm, FLabel, SLabel, Begin));
1410 DotDebugLocEntries.push_back(DotDebugLocEntry());
1413 // Collect info for variables that were optimized out.
1414 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1415 DIArray Variables = DISubprogram(FnScope->getScopeNode()).getVariables();
1416 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1417 DIVariable DV(Variables.getElement(i));
1418 if (!DV || !DV.isVariable() || !Processed.insert(DV))
1420 if (LexicalScope *Scope = LScopes.findLexicalScope(DV.getContext()))
1421 addScopeVariable(Scope, new DbgVariable(DV, NULL, this));
1425 // Return Label preceding the instruction.
1426 MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1427 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1428 assert(Label && "Didn't insert label before instruction");
1432 // Return Label immediately following the instruction.
1433 MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1434 return LabelsAfterInsn.lookup(MI);
1437 // Process beginning of an instruction.
1438 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1441 // Check if source location changes, but ignore DBG_VALUE locations.
1442 if (!MI->isDebugValue()) {
1443 DebugLoc DL = MI->getDebugLoc();
1444 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1447 if (DL == PrologEndLoc) {
1448 Flags |= DWARF2_FLAG_PROLOGUE_END;
1449 PrologEndLoc = DebugLoc();
1451 if (PrologEndLoc.isUnknown())
1452 Flags |= DWARF2_FLAG_IS_STMT;
1454 if (!DL.isUnknown()) {
1455 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1456 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1458 recordSourceLine(0, 0, 0, 0);
1462 // Insert labels where requested.
1463 DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
1464 LabelsBeforeInsn.find(MI);
1467 if (I == LabelsBeforeInsn.end())
1470 // Label already assigned.
1475 PrevLabel = MMI->getContext().CreateTempSymbol();
1476 Asm->OutStreamer.EmitLabel(PrevLabel);
1478 I->second = PrevLabel;
1481 // Process end of an instruction.
1482 void DwarfDebug::endInstruction() {
1484 // Don't create a new label after DBG_VALUE instructions.
1485 // They don't generate code.
1486 if (!CurMI->isDebugValue())
1489 DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
1490 LabelsAfterInsn.find(CurMI);
1494 if (I == LabelsAfterInsn.end())
1497 // Label already assigned.
1501 // We need a label after this instruction.
1503 PrevLabel = MMI->getContext().CreateTempSymbol();
1504 Asm->OutStreamer.EmitLabel(PrevLabel);
1506 I->second = PrevLabel;
1509 // Each LexicalScope has first instruction and last instruction to mark
1510 // beginning and end of a scope respectively. Create an inverse map that list
1511 // scopes starts (and ends) with an instruction. One instruction may start (or
1512 // end) multiple scopes. Ignore scopes that are not reachable.
1513 void DwarfDebug::identifyScopeMarkers() {
1514 SmallVector<LexicalScope *, 4> WorkList;
1515 WorkList.push_back(LScopes.getCurrentFunctionScope());
1516 while (!WorkList.empty()) {
1517 LexicalScope *S = WorkList.pop_back_val();
1519 const SmallVectorImpl<LexicalScope *> &Children = S->getChildren();
1520 if (!Children.empty())
1521 for (SmallVectorImpl<LexicalScope *>::const_iterator
1522 SI = Children.begin(),
1523 SE = Children.end();
1525 WorkList.push_back(*SI);
1527 if (S->isAbstractScope())
1530 const SmallVectorImpl<InsnRange> &Ranges = S->getRanges();
1533 for (SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin(),
1536 assert(RI->first && "InsnRange does not have first instruction!");
1537 assert(RI->second && "InsnRange does not have second instruction!");
1538 requestLabelBeforeInsn(RI->first);
1539 requestLabelAfterInsn(RI->second);
1544 // Get MDNode for DebugLoc's scope.
1545 static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
1546 if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
1547 return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
1548 return DL.getScope(Ctx);
1551 // Walk up the scope chain of given debug loc and find line number info
1552 // for the function.
1553 static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
1554 const MDNode *Scope = getScopeNode(DL, Ctx);
1555 DISubprogram SP = getDISubprogram(Scope);
1556 if (SP.isSubprogram()) {
1557 // Check for number of operands since the compatibility is
1559 if (SP->getNumOperands() > 19)
1560 return DebugLoc::get(SP.getScopeLineNumber(), 0, SP);
1562 return DebugLoc::get(SP.getLineNumber(), 0, SP);
1568 // Gather pre-function debug information. Assumes being called immediately
1569 // after the function entry point has been emitted.
1570 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1573 // If there's no debug info for the function we're not going to do anything.
1574 if (!MMI->hasDebugInfo())
1577 // Grab the lexical scopes for the function, if we don't have any of those
1578 // then we're not going to be able to do anything.
1579 LScopes.initialize(*MF);
1580 if (LScopes.empty())
1583 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
1585 // Make sure that each lexical scope will have a begin/end label.
1586 identifyScopeMarkers();
1588 // Set DwarfCompileUnitID in MCContext to the Compile Unit this function
1589 // belongs to so that we add to the correct per-cu line table in the
1591 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1592 CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1593 assert(TheCU && "Unable to find compile unit!");
1594 if (Asm->TM.hasMCUseLoc() && Asm->OutStreamer.hasRawTextSupport())
1595 // Use a single line table if we are using .loc and generating assembly.
1596 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1598 Asm->OutStreamer.getContext().setDwarfCompileUnitID(TheCU->getUniqueID());
1600 // Emit a label for the function so that we have a beginning address.
1601 FunctionBeginSym = Asm->GetTempSymbol("func_begin", Asm->getFunctionNumber());
1602 // Assumes in correct section after the entry point.
1603 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1605 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1606 // LiveUserVar - Map physreg numbers to the MDNode they contain.
1607 std::vector<const MDNode *> LiveUserVar(TRI->getNumRegs());
1609 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); I != E;
1611 bool AtBlockEntry = true;
1612 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1614 const MachineInstr *MI = II;
1616 if (MI->isDebugValue()) {
1617 assert(MI->getNumOperands() > 1 && "Invalid machine instruction!");
1619 // Keep track of user variables.
1621 MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1623 // Variable is in a register, we need to check for clobbers.
1624 if (isDbgValueInDefinedReg(MI))
1625 LiveUserVar[MI->getOperand(0).getReg()] = Var;
1627 // Check the history of this variable.
1628 SmallVectorImpl<const MachineInstr *> &History = DbgValues[Var];
1629 if (History.empty()) {
1630 UserVariables.push_back(Var);
1631 // The first mention of a function argument gets the FunctionBeginSym
1632 // label, so arguments are visible when breaking at function entry.
1634 if (DV.isVariable() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
1635 getDISubprogram(DV.getContext()).describes(MF->getFunction()))
1636 LabelsBeforeInsn[MI] = FunctionBeginSym;
1638 // We have seen this variable before. Try to coalesce DBG_VALUEs.
1639 const MachineInstr *Prev = History.back();
1640 if (Prev->isDebugValue()) {
1641 // Coalesce identical entries at the end of History.
1642 if (History.size() >= 2 &&
1643 Prev->isIdenticalTo(History[History.size() - 2])) {
1644 DEBUG(dbgs() << "Coalescing identical DBG_VALUE entries:\n"
1645 << "\t" << *Prev << "\t"
1646 << *History[History.size() - 2] << "\n");
1650 // Terminate old register assignments that don't reach MI;
1651 MachineFunction::const_iterator PrevMBB = Prev->getParent();
1652 if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
1653 isDbgValueInDefinedReg(Prev)) {
1654 // Previous register assignment needs to terminate at the end of
1656 MachineBasicBlock::const_iterator LastMI =
1657 PrevMBB->getLastNonDebugInstr();
1658 if (LastMI == PrevMBB->end()) {
1659 // Drop DBG_VALUE for empty range.
1660 DEBUG(dbgs() << "Dropping DBG_VALUE for empty range:\n"
1661 << "\t" << *Prev << "\n");
1663 } else if (llvm::next(PrevMBB) != PrevMBB->getParent()->end())
1664 // Terminate after LastMI.
1665 History.push_back(LastMI);
1669 History.push_back(MI);
1671 // Not a DBG_VALUE instruction.
1673 AtBlockEntry = false;
1675 // First known non-DBG_VALUE and non-frame setup location marks
1676 // the beginning of the function body.
1677 if (!MI->getFlag(MachineInstr::FrameSetup) &&
1678 (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown()))
1679 PrologEndLoc = MI->getDebugLoc();
1681 // Check if the instruction clobbers any registers with debug vars.
1682 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
1683 MOE = MI->operands_end();
1684 MOI != MOE; ++MOI) {
1685 if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
1687 for (MCRegAliasIterator AI(MOI->getReg(), TRI, true); AI.isValid();
1690 const MDNode *Var = LiveUserVar[Reg];
1693 // Reg is now clobbered.
1694 LiveUserVar[Reg] = 0;
1696 // Was MD last defined by a DBG_VALUE referring to Reg?
1697 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
1698 if (HistI == DbgValues.end())
1700 SmallVectorImpl<const MachineInstr *> &History = HistI->second;
1701 if (History.empty())
1703 const MachineInstr *Prev = History.back();
1704 // Sanity-check: Register assignments are terminated at the end of
1706 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
1708 // Is the variable still in Reg?
1709 if (!isDbgValueInDefinedReg(Prev) ||
1710 Prev->getOperand(0).getReg() != Reg)
1712 // Var is clobbered. Make sure the next instruction gets a label.
1713 History.push_back(MI);
1720 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
1722 SmallVectorImpl<const MachineInstr *> &History = I->second;
1723 if (History.empty())
1726 // Make sure the final register assignments are terminated.
1727 const MachineInstr *Prev = History.back();
1728 if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
1729 const MachineBasicBlock *PrevMBB = Prev->getParent();
1730 MachineBasicBlock::const_iterator LastMI =
1731 PrevMBB->getLastNonDebugInstr();
1732 if (LastMI == PrevMBB->end())
1733 // Drop DBG_VALUE for empty range.
1735 else if (PrevMBB != &PrevMBB->getParent()->back()) {
1736 // Terminate after LastMI.
1737 History.push_back(LastMI);
1740 // Request labels for the full history.
1741 for (unsigned i = 0, e = History.size(); i != e; ++i) {
1742 const MachineInstr *MI = History[i];
1743 if (MI->isDebugValue())
1744 requestLabelBeforeInsn(MI);
1746 requestLabelAfterInsn(MI);
1750 PrevInstLoc = DebugLoc();
1751 PrevLabel = FunctionBeginSym;
1753 // Record beginning of function.
1754 if (!PrologEndLoc.isUnknown()) {
1755 DebugLoc FnStartDL =
1756 getFnDebugLoc(PrologEndLoc, MF->getFunction()->getContext());
1758 FnStartDL.getLine(), FnStartDL.getCol(),
1759 FnStartDL.getScope(MF->getFunction()->getContext()),
1760 // We'd like to list the prologue as "not statements" but GDB behaves
1761 // poorly if we do that. Revisit this with caution/GDB (7.5+) testing.
1762 DWARF2_FLAG_IS_STMT);
1766 void DwarfDebug::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
1767 SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
1768 DIVariable DV = Var->getVariable();
1769 // Variables with positive arg numbers are parameters.
1770 if (unsigned ArgNum = DV.getArgNumber()) {
1771 // Keep all parameters in order at the start of the variable list to ensure
1772 // function types are correct (no out-of-order parameters)
1774 // This could be improved by only doing it for optimized builds (unoptimized
1775 // builds have the right order to begin with), searching from the back (this
1776 // would catch the unoptimized case quickly), or doing a binary search
1777 // rather than linear search.
1778 SmallVectorImpl<DbgVariable *>::iterator I = Vars.begin();
1779 while (I != Vars.end()) {
1780 unsigned CurNum = (*I)->getVariable().getArgNumber();
1781 // A local (non-parameter) variable has been found, insert immediately
1785 // A later indexed parameter has been found, insert immediately before it.
1786 if (CurNum > ArgNum)
1790 Vars.insert(I, Var);
1794 Vars.push_back(Var);
1797 // Gather and emit post-function debug information.
1798 void DwarfDebug::endFunction(const MachineFunction *MF) {
1799 // Every beginFunction(MF) call should be followed by an endFunction(MF) call,
1800 // though the beginFunction may not be called at all.
1801 // We should handle both cases.
1805 assert(CurFn == MF);
1808 if (!MMI->hasDebugInfo() || LScopes.empty()) {
1813 // Define end label for subprogram.
1814 FunctionEndSym = Asm->GetTempSymbol("func_end", Asm->getFunctionNumber());
1815 // Assumes in correct section after the entry point.
1816 Asm->OutStreamer.EmitLabel(FunctionEndSym);
1817 // Set DwarfCompileUnitID in MCContext to default value.
1818 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1820 SmallPtrSet<const MDNode *, 16> ProcessedVars;
1821 collectVariableInfo(ProcessedVars);
1823 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1824 CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1825 assert(TheCU && "Unable to find compile unit!");
1827 // Construct abstract scopes.
1828 ArrayRef<LexicalScope *> AList = LScopes.getAbstractScopesList();
1829 for (unsigned i = 0, e = AList.size(); i != e; ++i) {
1830 LexicalScope *AScope = AList[i];
1831 DISubprogram SP(AScope->getScopeNode());
1832 if (SP.isSubprogram()) {
1833 // Collect info for variables that were optimized out.
1834 DIArray Variables = SP.getVariables();
1835 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1836 DIVariable DV(Variables.getElement(i));
1837 if (!DV || !DV.isVariable() || !ProcessedVars.insert(DV))
1839 // Check that DbgVariable for DV wasn't created earlier, when
1840 // findAbstractVariable() was called for inlined instance of DV.
1841 LLVMContext &Ctx = DV->getContext();
1842 DIVariable CleanDV = cleanseInlinedVariable(DV, Ctx);
1843 if (AbstractVariables.lookup(CleanDV))
1845 if (LexicalScope *Scope = LScopes.findAbstractScope(DV.getContext()))
1846 addScopeVariable(Scope, new DbgVariable(DV, NULL, this));
1849 if (ProcessedSPNodes.count(AScope->getScopeNode()) == 0)
1850 constructScopeDIE(TheCU, AScope);
1853 DIE *CurFnDIE = constructScopeDIE(TheCU, FnScope);
1855 if (!CurFn->getTarget().Options.DisableFramePointerElim(*CurFn))
1856 TheCU->addFlag(CurFnDIE, dwarf::DW_AT_APPLE_omit_frame_ptr);
1859 for (ScopeVariablesMap::iterator I = ScopeVariables.begin(),
1860 E = ScopeVariables.end();
1862 DeleteContainerPointers(I->second);
1863 ScopeVariables.clear();
1864 DeleteContainerPointers(CurrentFnArguments);
1865 UserVariables.clear();
1867 AbstractVariables.clear();
1868 LabelsBeforeInsn.clear();
1869 LabelsAfterInsn.clear();
1874 // Register a source line with debug info. Returns the unique label that was
1875 // emitted and which provides correspondence to the source line list.
1876 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
1882 DIDescriptor Scope(S);
1884 if (Scope.isCompileUnit()) {
1885 DICompileUnit CU(S);
1886 Fn = CU.getFilename();
1887 Dir = CU.getDirectory();
1888 } else if (Scope.isFile()) {
1890 Fn = F.getFilename();
1891 Dir = F.getDirectory();
1892 } else if (Scope.isSubprogram()) {
1894 Fn = SP.getFilename();
1895 Dir = SP.getDirectory();
1896 } else if (Scope.isLexicalBlockFile()) {
1897 DILexicalBlockFile DBF(S);
1898 Fn = DBF.getFilename();
1899 Dir = DBF.getDirectory();
1900 } else if (Scope.isLexicalBlock()) {
1901 DILexicalBlock DB(S);
1902 Fn = DB.getFilename();
1903 Dir = DB.getDirectory();
1905 llvm_unreachable("Unexpected scope info");
1907 Src = getOrCreateSourceID(
1908 Fn, Dir, Asm->OutStreamer.getContext().getDwarfCompileUnitID());
1910 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0, 0, Fn);
1913 //===----------------------------------------------------------------------===//
1915 //===----------------------------------------------------------------------===//
1917 // Compute the size and offset of a DIE. The offset is relative to start of the
1918 // CU. It returns the offset after laying out the DIE.
1919 unsigned DwarfUnits::computeSizeAndOffset(DIE *Die, unsigned Offset) {
1920 // Get the children.
1921 const std::vector<DIE *> &Children = Die->getChildren();
1923 // Record the abbreviation.
1924 assignAbbrevNumber(Die->getAbbrev());
1926 // Get the abbreviation for this DIE.
1927 unsigned AbbrevNumber = Die->getAbbrevNumber();
1928 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
1931 Die->setOffset(Offset);
1933 // Start the size with the size of abbreviation code.
1934 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
1936 const SmallVectorImpl<DIEValue *> &Values = Die->getValues();
1937 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev->getData();
1939 // Size the DIE attribute values.
1940 for (unsigned i = 0, N = Values.size(); i < N; ++i)
1941 // Size attribute value.
1942 Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
1944 // Size the DIE children if any.
1945 if (!Children.empty()) {
1946 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
1947 "Children flag not set");
1949 for (unsigned j = 0, M = Children.size(); j < M; ++j)
1950 Offset = computeSizeAndOffset(Children[j], Offset);
1952 // End of children marker.
1953 Offset += sizeof(int8_t);
1956 Die->setSize(Offset - Die->getOffset());
1960 // Compute the size and offset for each DIE.
1961 void DwarfUnits::computeSizeAndOffsets() {
1962 // Offset from the first CU in the debug info section is 0 initially.
1963 unsigned SecOffset = 0;
1965 // Iterate over each compile unit and set the size and offsets for each
1966 // DIE within each compile unit. All offsets are CU relative.
1967 for (SmallVectorImpl<Unit *>::const_iterator I = CUs.begin(), E = CUs.end();
1969 (*I)->setDebugInfoOffset(SecOffset);
1971 // CU-relative offset is reset to 0 here.
1972 unsigned Offset = sizeof(int32_t) + // Length of Unit Info
1973 (*I)->getHeaderSize(); // Unit-specific headers
1975 // EndOffset here is CU-relative, after laying out
1976 // all of the CU DIE.
1977 unsigned EndOffset = computeSizeAndOffset((*I)->getUnitDie(), Offset);
1978 SecOffset += EndOffset;
1982 // Emit initial Dwarf sections with a label at the start of each one.
1983 void DwarfDebug::emitSectionLabels() {
1984 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1986 // Dwarf sections base addresses.
1987 DwarfInfoSectionSym =
1988 emitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
1989 DwarfAbbrevSectionSym =
1990 emitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
1991 if (useSplitDwarf())
1992 DwarfAbbrevDWOSectionSym = emitSectionSym(
1993 Asm, TLOF.getDwarfAbbrevDWOSection(), "section_abbrev_dwo");
1994 emitSectionSym(Asm, TLOF.getDwarfARangesSection());
1996 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
1997 emitSectionSym(Asm, MacroInfo);
1999 DwarfLineSectionSym =
2000 emitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
2001 emitSectionSym(Asm, TLOF.getDwarfLocSection());
2002 if (GenerateGnuPubSections) {
2003 DwarfGnuPubNamesSectionSym =
2004 emitSectionSym(Asm, TLOF.getDwarfGnuPubNamesSection());
2005 DwarfGnuPubTypesSectionSym =
2006 emitSectionSym(Asm, TLOF.getDwarfGnuPubTypesSection());
2007 } else if (HasDwarfPubSections) {
2008 emitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
2009 emitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
2012 DwarfStrSectionSym =
2013 emitSectionSym(Asm, TLOF.getDwarfStrSection(), "info_string");
2014 if (useSplitDwarf()) {
2015 DwarfStrDWOSectionSym =
2016 emitSectionSym(Asm, TLOF.getDwarfStrDWOSection(), "skel_string");
2017 DwarfAddrSectionSym =
2018 emitSectionSym(Asm, TLOF.getDwarfAddrSection(), "addr_sec");
2020 DwarfDebugRangeSectionSym =
2021 emitSectionSym(Asm, TLOF.getDwarfRangesSection(), "debug_range");
2023 DwarfDebugLocSectionSym =
2024 emitSectionSym(Asm, TLOF.getDwarfLocSection(), "section_debug_loc");
2026 TextSectionSym = emitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
2027 emitSectionSym(Asm, TLOF.getDataSection());
2030 // Recursively emits a debug information entry.
2031 void DwarfDebug::emitDIE(DIE *Die, ArrayRef<DIEAbbrev *> Abbrevs) {
2032 // Get the abbreviation for this DIE.
2033 unsigned AbbrevNumber = Die->getAbbrevNumber();
2034 const DIEAbbrev *Abbrev = Abbrevs[AbbrevNumber - 1];
2036 // Emit the code (index) for the abbreviation.
2037 if (Asm->isVerbose())
2038 Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
2039 Twine::utohexstr(Die->getOffset()) + ":0x" +
2040 Twine::utohexstr(Die->getSize()) + " " +
2041 dwarf::TagString(Abbrev->getTag()));
2042 Asm->EmitULEB128(AbbrevNumber);
2044 const SmallVectorImpl<DIEValue *> &Values = Die->getValues();
2045 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev->getData();
2047 // Emit the DIE attribute values.
2048 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2049 dwarf::Attribute Attr = AbbrevData[i].getAttribute();
2050 dwarf::Form Form = AbbrevData[i].getForm();
2051 assert(Form && "Too many attributes for DIE (check abbreviation)");
2053 if (Asm->isVerbose())
2054 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
2057 case dwarf::DW_AT_abstract_origin:
2058 case dwarf::DW_AT_type:
2059 case dwarf::DW_AT_friend:
2060 case dwarf::DW_AT_specification:
2061 case dwarf::DW_AT_import:
2062 case dwarf::DW_AT_containing_type: {
2063 DIEEntry *E = cast<DIEEntry>(Values[i]);
2064 DIE *Origin = E->getEntry();
2065 unsigned Addr = Origin->getOffset();
2066 if (Form == dwarf::DW_FORM_ref_addr) {
2067 assert(!useSplitDwarf() && "TODO: dwo files can't have relocations.");
2068 // For DW_FORM_ref_addr, output the offset from beginning of debug info
2069 // section. Origin->getOffset() returns the offset from start of the
2071 CompileUnit *CU = CUDieMap.lookup(Origin->getUnit());
2072 assert(CU && "CUDie should belong to a CU.");
2073 Addr += CU->getDebugInfoOffset();
2074 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2075 Asm->EmitLabelPlusOffset(DwarfInfoSectionSym, Addr,
2076 DIEEntry::getRefAddrSize(Asm));
2078 Asm->EmitLabelOffsetDifference(DwarfInfoSectionSym, Addr,
2079 DwarfInfoSectionSym,
2080 DIEEntry::getRefAddrSize(Asm));
2082 // Make sure Origin belong to the same CU.
2083 assert(Die->getUnit() == Origin->getUnit() &&
2084 "The referenced DIE should belong to the same CU in ref4");
2085 Asm->EmitInt32(Addr);
2089 case dwarf::DW_AT_ranges: {
2090 // DW_AT_range Value encodes offset in debug_range section.
2091 DIELabel *V = cast<DIELabel>(Values[i]);
2093 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2094 Asm->EmitSectionOffset(V->getValue(), DwarfDebugRangeSectionSym);
2096 Asm->EmitLabelDifference(V->getValue(), DwarfDebugRangeSectionSym, 4);
2099 case dwarf::DW_AT_location: {
2100 if (DIELabel *L = dyn_cast<DIELabel>(Values[i])) {
2101 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2102 Asm->EmitSectionOffset(L->getValue(), DwarfDebugLocSectionSym);
2104 Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
2106 Values[i]->EmitValue(Asm, Form);
2110 case dwarf::DW_AT_accessibility: {
2111 if (Asm->isVerbose()) {
2112 DIEInteger *V = cast<DIEInteger>(Values[i]);
2113 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
2115 Values[i]->EmitValue(Asm, Form);
2119 // Emit an attribute using the defined form.
2120 Values[i]->EmitValue(Asm, Form);
2125 // Emit the DIE children if any.
2126 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
2127 const std::vector<DIE *> &Children = Die->getChildren();
2129 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2130 emitDIE(Children[j], Abbrevs);
2132 Asm->OutStreamer.AddComment("End Of Children Mark");
2137 // Emit the various dwarf units to the unit section USection with
2138 // the abbreviations going into ASection.
2139 void DwarfUnits::emitUnits(DwarfDebug *DD, const MCSection *USection,
2140 const MCSection *ASection,
2141 const MCSymbol *ASectionSym) {
2142 Asm->OutStreamer.SwitchSection(USection);
2143 for (SmallVectorImpl<Unit *>::iterator I = CUs.begin(), E = CUs.end(); I != E;
2146 DIE *Die = TheU->getUnitDie();
2148 // Emit the compile units header.
2149 Asm->OutStreamer.EmitLabel(
2150 Asm->GetTempSymbol(USection->getLabelBeginName(), TheU->getUniqueID()));
2152 // Emit size of content not including length itself
2153 Asm->OutStreamer.AddComment("Length of Unit");
2154 Asm->EmitInt32(TheU->getHeaderSize() + Die->getSize());
2156 TheU->emitHeader(ASection, ASectionSym);
2158 DD->emitDIE(Die, Abbreviations);
2159 Asm->OutStreamer.EmitLabel(
2160 Asm->GetTempSymbol(USection->getLabelEndName(), TheU->getUniqueID()));
2164 // Emit the debug info section.
2165 void DwarfDebug::emitDebugInfo() {
2166 DwarfUnits &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2168 Holder.emitUnits(this, Asm->getObjFileLowering().getDwarfInfoSection(),
2169 Asm->getObjFileLowering().getDwarfAbbrevSection(),
2170 DwarfAbbrevSectionSym);
2173 // Emit the abbreviation section.
2174 void DwarfDebug::emitAbbreviations() {
2175 if (!useSplitDwarf())
2176 emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection(),
2179 emitSkeletonAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection());
2182 void DwarfDebug::emitAbbrevs(const MCSection *Section,
2183 std::vector<DIEAbbrev *> *Abbrevs) {
2184 // Check to see if it is worth the effort.
2185 if (!Abbrevs->empty()) {
2186 // Start the debug abbrev section.
2187 Asm->OutStreamer.SwitchSection(Section);
2189 // For each abbrevation.
2190 for (unsigned i = 0, N = Abbrevs->size(); i < N; ++i) {
2191 // Get abbreviation data
2192 const DIEAbbrev *Abbrev = Abbrevs->at(i);
2194 // Emit the abbrevations code (base 1 index.)
2195 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
2197 // Emit the abbreviations data.
2201 // Mark end of abbreviations.
2202 Asm->EmitULEB128(0, "EOM(3)");
2206 // Emit the last address of the section and the end of the line matrix.
2207 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
2208 // Define last address of section.
2209 Asm->OutStreamer.AddComment("Extended Op");
2212 Asm->OutStreamer.AddComment("Op size");
2213 Asm->EmitInt8(Asm->getDataLayout().getPointerSize() + 1);
2214 Asm->OutStreamer.AddComment("DW_LNE_set_address");
2215 Asm->EmitInt8(dwarf::DW_LNE_set_address);
2217 Asm->OutStreamer.AddComment("Section end label");
2219 Asm->OutStreamer.EmitSymbolValue(
2220 Asm->GetTempSymbol("section_end", SectionEnd),
2221 Asm->getDataLayout().getPointerSize());
2223 // Mark end of matrix.
2224 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
2230 // Emit visible names into a hashed accelerator table section.
2231 void DwarfDebug::emitAccelNames() {
2233 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4));
2234 for (SmallVectorImpl<Unit *>::const_iterator I = getUnits().begin(),
2235 E = getUnits().end();
2238 const StringMap<std::vector<const DIE *> > &Names = TheU->getAccelNames();
2239 for (StringMap<std::vector<const DIE *> >::const_iterator
2243 StringRef Name = GI->getKey();
2244 const std::vector<const DIE *> &Entities = GI->second;
2245 for (std::vector<const DIE *>::const_iterator DI = Entities.begin(),
2246 DE = Entities.end();
2248 AT.AddName(Name, *DI);
2252 AT.FinalizeTable(Asm, "Names");
2253 Asm->OutStreamer.SwitchSection(
2254 Asm->getObjFileLowering().getDwarfAccelNamesSection());
2255 MCSymbol *SectionBegin = Asm->GetTempSymbol("names_begin");
2256 Asm->OutStreamer.EmitLabel(SectionBegin);
2258 // Emit the full data.
2259 AT.Emit(Asm, SectionBegin, &InfoHolder);
2262 // Emit objective C classes and categories into a hashed accelerator table
2264 void DwarfDebug::emitAccelObjC() {
2266 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4));
2267 for (SmallVectorImpl<Unit *>::const_iterator I = getUnits().begin(),
2268 E = getUnits().end();
2271 const StringMap<std::vector<const DIE *> > &Names = TheU->getAccelObjC();
2272 for (StringMap<std::vector<const DIE *> >::const_iterator
2276 StringRef Name = GI->getKey();
2277 const std::vector<const DIE *> &Entities = GI->second;
2278 for (std::vector<const DIE *>::const_iterator DI = Entities.begin(),
2279 DE = Entities.end();
2281 AT.AddName(Name, *DI);
2285 AT.FinalizeTable(Asm, "ObjC");
2286 Asm->OutStreamer.SwitchSection(
2287 Asm->getObjFileLowering().getDwarfAccelObjCSection());
2288 MCSymbol *SectionBegin = Asm->GetTempSymbol("objc_begin");
2289 Asm->OutStreamer.EmitLabel(SectionBegin);
2291 // Emit the full data.
2292 AT.Emit(Asm, SectionBegin, &InfoHolder);
2295 // Emit namespace dies into a hashed accelerator table.
2296 void DwarfDebug::emitAccelNamespaces() {
2298 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4));
2299 for (SmallVectorImpl<Unit *>::const_iterator I = getUnits().begin(),
2300 E = getUnits().end();
2303 const StringMap<std::vector<const DIE *> > &Names =
2304 TheU->getAccelNamespace();
2305 for (StringMap<std::vector<const DIE *> >::const_iterator
2309 StringRef Name = GI->getKey();
2310 const std::vector<const DIE *> &Entities = GI->second;
2311 for (std::vector<const DIE *>::const_iterator DI = Entities.begin(),
2312 DE = Entities.end();
2314 AT.AddName(Name, *DI);
2318 AT.FinalizeTable(Asm, "namespac");
2319 Asm->OutStreamer.SwitchSection(
2320 Asm->getObjFileLowering().getDwarfAccelNamespaceSection());
2321 MCSymbol *SectionBegin = Asm->GetTempSymbol("namespac_begin");
2322 Asm->OutStreamer.EmitLabel(SectionBegin);
2324 // Emit the full data.
2325 AT.Emit(Asm, SectionBegin, &InfoHolder);
2328 // Emit type dies into a hashed accelerator table.
2329 void DwarfDebug::emitAccelTypes() {
2330 std::vector<DwarfAccelTable::Atom> Atoms;
2332 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4));
2334 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_tag, dwarf::DW_FORM_data2));
2336 DwarfAccelTable::Atom(dwarf::DW_ATOM_type_flags, dwarf::DW_FORM_data1));
2337 DwarfAccelTable AT(Atoms);
2338 for (SmallVectorImpl<Unit *>::const_iterator I = getUnits().begin(),
2339 E = getUnits().end();
2342 const StringMap<std::vector<std::pair<const DIE *, unsigned> > > &Names =
2343 TheU->getAccelTypes();
2345 std::vector<std::pair<const DIE *, unsigned> > >::const_iterator
2349 StringRef Name = GI->getKey();
2350 const std::vector<std::pair<const DIE *, unsigned> > &Entities =
2352 for (std::vector<std::pair<const DIE *, unsigned> >::const_iterator
2353 DI = Entities.begin(),
2354 DE = Entities.end();
2356 AT.AddName(Name, DI->first, DI->second);
2360 AT.FinalizeTable(Asm, "types");
2361 Asm->OutStreamer.SwitchSection(
2362 Asm->getObjFileLowering().getDwarfAccelTypesSection());
2363 MCSymbol *SectionBegin = Asm->GetTempSymbol("types_begin");
2364 Asm->OutStreamer.EmitLabel(SectionBegin);
2366 // Emit the full data.
2367 AT.Emit(Asm, SectionBegin, &InfoHolder);
2370 // Public name handling.
2371 // The format for the various pubnames:
2373 // dwarf pubnames - offset/name pairs where the offset is the offset into the CU
2374 // for the DIE that is named.
2376 // gnu pubnames - offset/index value/name tuples where the offset is the offset
2377 // into the CU and the index value is computed according to the type of value
2378 // for the DIE that is named.
2380 // For type units the offset is the offset of the skeleton DIE. For split dwarf
2381 // it's the offset within the debug_info/debug_types dwo section, however, the
2382 // reference in the pubname header doesn't change.
2384 /// computeIndexValue - Compute the gdb index value for the DIE and CU.
2385 static dwarf::PubIndexEntryDescriptor computeIndexValue(Unit *CU,
2387 dwarf::GDBIndexEntryLinkage Linkage = dwarf::GIEL_STATIC;
2389 // We could have a specification DIE that has our most of our knowledge,
2390 // look for that now.
2391 DIEValue *SpecVal = Die->findAttribute(dwarf::DW_AT_specification);
2393 DIE *SpecDIE = cast<DIEEntry>(SpecVal)->getEntry();
2394 if (SpecDIE->findAttribute(dwarf::DW_AT_external))
2395 Linkage = dwarf::GIEL_EXTERNAL;
2396 } else if (Die->findAttribute(dwarf::DW_AT_external))
2397 Linkage = dwarf::GIEL_EXTERNAL;
2399 switch (Die->getTag()) {
2400 case dwarf::DW_TAG_class_type:
2401 case dwarf::DW_TAG_structure_type:
2402 case dwarf::DW_TAG_union_type:
2403 case dwarf::DW_TAG_enumeration_type:
2404 return dwarf::PubIndexEntryDescriptor(
2405 dwarf::GIEK_TYPE, CU->getLanguage() != dwarf::DW_LANG_C_plus_plus
2406 ? dwarf::GIEL_STATIC
2407 : dwarf::GIEL_EXTERNAL);
2408 case dwarf::DW_TAG_typedef:
2409 case dwarf::DW_TAG_base_type:
2410 case dwarf::DW_TAG_subrange_type:
2411 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_TYPE, dwarf::GIEL_STATIC);
2412 case dwarf::DW_TAG_namespace:
2413 return dwarf::GIEK_TYPE;
2414 case dwarf::DW_TAG_subprogram:
2415 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_FUNCTION, Linkage);
2416 case dwarf::DW_TAG_constant:
2417 case dwarf::DW_TAG_variable:
2418 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE, Linkage);
2419 case dwarf::DW_TAG_enumerator:
2420 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE,
2421 dwarf::GIEL_STATIC);
2423 return dwarf::GIEK_NONE;
2427 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
2429 void DwarfDebug::emitDebugPubNames(bool GnuStyle) {
2430 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2431 const MCSection *PSec =
2432 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubNamesSection()
2433 : Asm->getObjFileLowering().getDwarfPubNamesSection();
2435 for (SmallVectorImpl<Unit *>::const_iterator I = getUnits().begin(),
2436 E = getUnits().end();
2439 unsigned ID = TheU->getUniqueID();
2441 // Start the dwarf pubnames section.
2442 Asm->OutStreamer.SwitchSection(PSec);
2444 // Emit a label so we can reference the beginning of this pubname section.
2446 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("gnu_pubnames", ID));
2449 Asm->OutStreamer.AddComment("Length of Public Names Info");
2450 MCSymbol *BeginLabel = Asm->GetTempSymbol("pubnames_begin", ID);
2451 MCSymbol *EndLabel = Asm->GetTempSymbol("pubnames_end", ID);
2452 Asm->EmitLabelDifference(EndLabel, BeginLabel, 4);
2454 Asm->OutStreamer.EmitLabel(BeginLabel);
2456 Asm->OutStreamer.AddComment("DWARF Version");
2457 Asm->EmitInt16(dwarf::DW_PUBNAMES_VERSION);
2459 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2460 Asm->EmitSectionOffset(Asm->GetTempSymbol(ISec->getLabelBeginName(), ID),
2461 DwarfInfoSectionSym);
2463 Asm->OutStreamer.AddComment("Compilation Unit Length");
2464 Asm->EmitLabelDifference(Asm->GetTempSymbol(ISec->getLabelEndName(), ID),
2465 Asm->GetTempSymbol(ISec->getLabelBeginName(), ID),
2468 // Emit the pubnames for this compilation unit.
2469 const StringMap<const DIE *> &Globals = TheU->getGlobalNames();
2470 for (StringMap<const DIE *>::const_iterator GI = Globals.begin(),
2473 const char *Name = GI->getKeyData();
2474 const DIE *Entity = GI->second;
2476 Asm->OutStreamer.AddComment("DIE offset");
2477 Asm->EmitInt32(Entity->getOffset());
2480 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheU, Entity);
2481 Asm->OutStreamer.AddComment(
2482 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
2483 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
2484 Asm->EmitInt8(Desc.toBits());
2487 Asm->OutStreamer.AddComment("External Name");
2488 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength() + 1));
2491 Asm->OutStreamer.AddComment("End Mark");
2493 Asm->OutStreamer.EmitLabel(EndLabel);
2497 void DwarfDebug::emitDebugPubTypes(bool GnuStyle) {
2498 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2499 const MCSection *PSec =
2500 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubTypesSection()
2501 : Asm->getObjFileLowering().getDwarfPubTypesSection();
2503 for (SmallVectorImpl<Unit *>::const_iterator I = getUnits().begin(),
2504 E = getUnits().end();
2507 unsigned ID = TheU->getUniqueID();
2509 // Start the dwarf pubtypes section.
2510 Asm->OutStreamer.SwitchSection(PSec);
2512 // Emit a label so we can reference the beginning of this pubtype section.
2514 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("gnu_pubtypes", ID));
2517 Asm->OutStreamer.AddComment("Length of Public Types Info");
2518 MCSymbol *BeginLabel = Asm->GetTempSymbol("pubtypes_begin", ID);
2519 MCSymbol *EndLabel = Asm->GetTempSymbol("pubtypes_end", ID);
2520 Asm->EmitLabelDifference(EndLabel, BeginLabel, 4);
2522 Asm->OutStreamer.EmitLabel(BeginLabel);
2524 Asm->OutStreamer.AddComment("DWARF Version");
2525 Asm->EmitInt16(dwarf::DW_PUBTYPES_VERSION);
2527 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2528 Asm->EmitSectionOffset(
2529 Asm->GetTempSymbol(ISec->getLabelBeginName(), TheU->getUniqueID()),
2530 DwarfInfoSectionSym);
2532 Asm->OutStreamer.AddComment("Compilation Unit Length");
2533 Asm->EmitLabelDifference(
2534 Asm->GetTempSymbol(ISec->getLabelEndName(), TheU->getUniqueID()),
2535 Asm->GetTempSymbol(ISec->getLabelBeginName(), TheU->getUniqueID()), 4);
2537 // Emit the pubtypes.
2538 const StringMap<const DIE *> &Globals = TheU->getGlobalTypes();
2539 for (StringMap<const DIE *>::const_iterator GI = Globals.begin(),
2542 const char *Name = GI->getKeyData();
2543 const DIE *Entity = GI->second;
2545 Asm->OutStreamer.AddComment("DIE offset");
2546 Asm->EmitInt32(Entity->getOffset());
2549 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheU, Entity);
2550 Asm->OutStreamer.AddComment(
2551 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
2552 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
2553 Asm->EmitInt8(Desc.toBits());
2556 Asm->OutStreamer.AddComment("External Name");
2558 // Emit the name with a terminating null byte.
2559 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength() + 1));
2562 Asm->OutStreamer.AddComment("End Mark");
2564 Asm->OutStreamer.EmitLabel(EndLabel);
2568 // Emit strings into a string section.
2569 void DwarfUnits::emitStrings(const MCSection *StrSection,
2570 const MCSection *OffsetSection = NULL,
2571 const MCSymbol *StrSecSym = NULL) {
2573 if (StringPool.empty())
2576 // Start the dwarf str section.
2577 Asm->OutStreamer.SwitchSection(StrSection);
2579 // Get all of the string pool entries and put them in an array by their ID so
2580 // we can sort them.
2582 std::pair<unsigned, StringMapEntry<std::pair<MCSymbol *, unsigned> > *>,
2585 for (StringMap<std::pair<MCSymbol *, unsigned> >::iterator
2586 I = StringPool.begin(),
2587 E = StringPool.end();
2589 Entries.push_back(std::make_pair(I->second.second, &*I));
2591 array_pod_sort(Entries.begin(), Entries.end());
2593 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2594 // Emit a label for reference from debug information entries.
2595 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
2597 // Emit the string itself with a terminating null byte.
2598 Asm->OutStreamer.EmitBytes(
2599 StringRef(Entries[i].second->getKeyData(),
2600 Entries[i].second->getKeyLength() + 1));
2603 // If we've got an offset section go ahead and emit that now as well.
2604 if (OffsetSection) {
2605 Asm->OutStreamer.SwitchSection(OffsetSection);
2606 unsigned offset = 0;
2607 unsigned size = 4; // FIXME: DWARF64 is 8.
2608 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2609 Asm->OutStreamer.EmitIntValue(offset, size);
2610 offset += Entries[i].second->getKeyLength() + 1;
2616 // Emit addresses into the section given.
2617 void DwarfUnits::emitAddresses(const MCSection *AddrSection) {
2619 if (AddressPool.empty())
2622 // Start the dwarf addr section.
2623 Asm->OutStreamer.SwitchSection(AddrSection);
2625 // Order the address pool entries by ID
2626 SmallVector<const MCExpr *, 64> Entries(AddressPool.size());
2628 for (DenseMap<const MCExpr *, unsigned>::iterator I = AddressPool.begin(),
2629 E = AddressPool.end();
2631 Entries[I->second] = I->first;
2633 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2634 // Emit an expression for reference from debug information entries.
2635 if (const MCExpr *Expr = Entries[i])
2636 Asm->OutStreamer.EmitValue(Expr, Asm->getDataLayout().getPointerSize());
2638 Asm->OutStreamer.EmitIntValue(0, Asm->getDataLayout().getPointerSize());
2642 // Emit visible names into a debug str section.
2643 void DwarfDebug::emitDebugStr() {
2644 DwarfUnits &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2645 Holder.emitStrings(Asm->getObjFileLowering().getDwarfStrSection());
2648 // Emit locations into the debug loc section.
2649 void DwarfDebug::emitDebugLoc() {
2650 if (DotDebugLocEntries.empty())
2653 for (SmallVectorImpl<DotDebugLocEntry>::iterator
2654 I = DotDebugLocEntries.begin(),
2655 E = DotDebugLocEntries.end();
2657 DotDebugLocEntry &Entry = *I;
2658 if (I + 1 != DotDebugLocEntries.end())
2662 // Start the dwarf loc section.
2663 Asm->OutStreamer.SwitchSection(
2664 Asm->getObjFileLowering().getDwarfLocSection());
2665 unsigned char Size = Asm->getDataLayout().getPointerSize();
2666 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
2668 for (SmallVectorImpl<DotDebugLocEntry>::iterator
2669 I = DotDebugLocEntries.begin(),
2670 E = DotDebugLocEntries.end();
2671 I != E; ++I, ++index) {
2672 DotDebugLocEntry &Entry = *I;
2673 if (Entry.isMerged())
2675 if (Entry.isEmpty()) {
2676 Asm->OutStreamer.EmitIntValue(0, Size);
2677 Asm->OutStreamer.EmitIntValue(0, Size);
2678 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
2680 Asm->OutStreamer.EmitSymbolValue(Entry.getBeginSym(), Size);
2681 Asm->OutStreamer.EmitSymbolValue(Entry.getEndSym(), Size);
2682 DIVariable DV(Entry.getVariable());
2683 Asm->OutStreamer.AddComment("Loc expr size");
2684 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
2685 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
2686 Asm->EmitLabelDifference(end, begin, 2);
2687 Asm->OutStreamer.EmitLabel(begin);
2688 if (Entry.isInt()) {
2689 DIBasicType BTy(DV.getType());
2690 if (BTy.Verify() && (BTy.getEncoding() == dwarf::DW_ATE_signed ||
2691 BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
2692 Asm->OutStreamer.AddComment("DW_OP_consts");
2693 Asm->EmitInt8(dwarf::DW_OP_consts);
2694 Asm->EmitSLEB128(Entry.getInt());
2696 Asm->OutStreamer.AddComment("DW_OP_constu");
2697 Asm->EmitInt8(dwarf::DW_OP_constu);
2698 Asm->EmitULEB128(Entry.getInt());
2700 } else if (Entry.isLocation()) {
2701 MachineLocation Loc = Entry.getLoc();
2702 if (!DV.hasComplexAddress())
2704 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2706 // Complex address entry.
2707 unsigned N = DV.getNumAddrElements();
2709 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
2710 if (Loc.getOffset()) {
2712 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2713 Asm->OutStreamer.AddComment("DW_OP_deref");
2714 Asm->EmitInt8(dwarf::DW_OP_deref);
2715 Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
2716 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2717 Asm->EmitSLEB128(DV.getAddrElement(1));
2719 // If first address element is OpPlus then emit
2720 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
2721 MachineLocation TLoc(Loc.getReg(), DV.getAddrElement(1));
2722 Asm->EmitDwarfRegOp(TLoc, DV.isIndirect());
2726 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2729 // Emit remaining complex address elements.
2730 for (; i < N; ++i) {
2731 uint64_t Element = DV.getAddrElement(i);
2732 if (Element == DIBuilder::OpPlus) {
2733 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2734 Asm->EmitULEB128(DV.getAddrElement(++i));
2735 } else if (Element == DIBuilder::OpDeref) {
2737 Asm->EmitInt8(dwarf::DW_OP_deref);
2739 llvm_unreachable("unknown Opcode found in complex address");
2743 // else ... ignore constant fp. There is not any good way to
2744 // to represent them here in dwarf.
2745 Asm->OutStreamer.EmitLabel(end);
2750 struct SymbolCUSorter {
2751 SymbolCUSorter(const MCStreamer &s) : Streamer(s) {}
2752 const MCStreamer &Streamer;
2754 bool operator()(const SymbolCU &A, const SymbolCU &B) {
2755 unsigned IA = A.Sym ? Streamer.GetSymbolOrder(A.Sym) : 0;
2756 unsigned IB = B.Sym ? Streamer.GetSymbolOrder(B.Sym) : 0;
2758 // Symbols with no order assigned should be placed at the end.
2759 // (e.g. section end labels)
2761 IA = (unsigned)(-1);
2763 IB = (unsigned)(-1);
2768 static bool CUSort(const Unit *A, const Unit *B) {
2769 return (A->getUniqueID() < B->getUniqueID());
2773 const MCSymbol *Start, *End;
2776 // Emit a debug aranges section, containing a CU lookup for any
2777 // address we can tie back to a CU.
2778 void DwarfDebug::emitDebugARanges() {
2779 // Start the dwarf aranges section.
2780 Asm->OutStreamer.SwitchSection(
2781 Asm->getObjFileLowering().getDwarfARangesSection());
2783 typedef DenseMap<CompileUnit *, std::vector<ArangeSpan> > SpansType;
2787 // Build a list of sections used.
2788 std::vector<const MCSection *> Sections;
2789 for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
2791 const MCSection *Section = it->first;
2792 Sections.push_back(Section);
2795 // Sort the sections into order.
2796 // This is only done to ensure consistent output order across different runs.
2797 std::sort(Sections.begin(), Sections.end(), SectionSort);
2799 // Build a set of address spans, sorted by CU.
2800 for (size_t SecIdx = 0; SecIdx < Sections.size(); SecIdx++) {
2801 const MCSection *Section = Sections[SecIdx];
2802 SmallVector<SymbolCU, 8> &List = SectionMap[Section];
2803 if (List.size() < 2)
2806 // Sort the symbols by offset within the section.
2807 SymbolCUSorter sorter(Asm->OutStreamer);
2808 std::sort(List.begin(), List.end(), sorter);
2810 // If we have no section (e.g. common), just write out
2811 // individual spans for each symbol.
2812 if (Section == NULL) {
2813 for (size_t n = 0; n < List.size(); n++) {
2814 const SymbolCU &Cur = List[n];
2817 Span.Start = Cur.Sym;
2820 Spans[Cur.CU].push_back(Span);
2823 // Build spans between each label.
2824 const MCSymbol *StartSym = List[0].Sym;
2825 for (size_t n = 1; n < List.size(); n++) {
2826 const SymbolCU &Prev = List[n - 1];
2827 const SymbolCU &Cur = List[n];
2829 // Try and build the longest span we can within the same CU.
2830 if (Cur.CU != Prev.CU) {
2832 Span.Start = StartSym;
2834 Spans[Prev.CU].push_back(Span);
2841 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2842 unsigned PtrSize = Asm->getDataLayout().getPointerSize();
2844 // Build a list of CUs used.
2845 std::vector<CompileUnit *> CUs;
2846 for (SpansType::iterator it = Spans.begin(); it != Spans.end(); it++) {
2847 CompileUnit *CU = it->first;
2851 // Sort the CU list (again, to ensure consistent output order).
2852 std::sort(CUs.begin(), CUs.end(), CUSort);
2854 // Emit an arange table for each CU we used.
2855 for (size_t CUIdx = 0; CUIdx < CUs.size(); CUIdx++) {
2856 CompileUnit *CU = CUs[CUIdx];
2857 std::vector<ArangeSpan> &List = Spans[CU];
2859 // Emit size of content not including length itself.
2860 unsigned ContentSize =
2861 sizeof(int16_t) + // DWARF ARange version number
2862 sizeof(int32_t) + // Offset of CU in the .debug_info section
2863 sizeof(int8_t) + // Pointer Size (in bytes)
2864 sizeof(int8_t); // Segment Size (in bytes)
2866 unsigned TupleSize = PtrSize * 2;
2868 // 7.20 in the Dwarf specs requires the table to be aligned to a tuple.
2869 unsigned Padding = 0;
2870 while (((sizeof(int32_t) + ContentSize + Padding) % TupleSize) != 0)
2873 ContentSize += Padding;
2874 ContentSize += (List.size() + 1) * TupleSize;
2876 // For each compile unit, write the list of spans it covers.
2877 Asm->OutStreamer.AddComment("Length of ARange Set");
2878 Asm->EmitInt32(ContentSize);
2879 Asm->OutStreamer.AddComment("DWARF Arange version number");
2880 Asm->EmitInt16(dwarf::DW_ARANGES_VERSION);
2881 Asm->OutStreamer.AddComment("Offset Into Debug Info Section");
2882 Asm->EmitSectionOffset(
2883 Asm->GetTempSymbol(ISec->getLabelBeginName(), CU->getUniqueID()),
2884 DwarfInfoSectionSym);
2885 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2886 Asm->EmitInt8(PtrSize);
2887 Asm->OutStreamer.AddComment("Segment Size (in bytes)");
2890 for (unsigned n = 0; n < Padding; n++)
2891 Asm->EmitInt8(0xff);
2893 for (unsigned n = 0; n < List.size(); n++) {
2894 const ArangeSpan &Span = List[n];
2895 Asm->EmitLabelReference(Span.Start, PtrSize);
2897 // Calculate the size as being from the span start to it's end.
2899 Asm->EmitLabelDifference(Span.End, Span.Start, PtrSize);
2901 // For symbols without an end marker (e.g. common), we
2902 // write a single arange entry containing just that one symbol.
2903 uint64_t Size = SymSize[Span.Start];
2907 Asm->OutStreamer.EmitIntValue(Size, PtrSize);
2911 Asm->OutStreamer.AddComment("ARange terminator");
2912 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2913 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2917 // Emit visible names into a debug ranges section.
2918 void DwarfDebug::emitDebugRanges() {
2919 // Start the dwarf ranges section.
2920 Asm->OutStreamer.SwitchSection(
2921 Asm->getObjFileLowering().getDwarfRangesSection());
2923 // Size for our labels.
2924 unsigned char Size = Asm->getDataLayout().getPointerSize();
2926 // Grab the specific ranges for the compile units in the module.
2927 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2930 CompileUnit *TheCU = I->second;
2931 unsigned ID = TheCU->getUniqueID();
2933 // Emit a symbol so we can find the beginning of our ranges.
2934 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("gnu_ranges", ID));
2936 // Iterate over the misc ranges for the compile units in the module.
2937 const SmallVectorImpl<RangeSpanList> &RangeLists = TheCU->getRangeLists();
2938 for (SmallVectorImpl<RangeSpanList>::const_iterator
2939 I = RangeLists.begin(),
2940 E = RangeLists.end();
2942 const RangeSpanList &List = *I;
2944 // Emit our symbol so we can find the beginning of the range.
2945 Asm->OutStreamer.EmitLabel(List.getSym());
2947 for (SmallVectorImpl<RangeSpan>::const_iterator
2948 RI = List.getRanges().begin(),
2949 RE = List.getRanges().end();
2951 const RangeSpan &Range = *RI;
2952 // We occasionally have ranges without begin/end labels.
2953 // FIXME: Verify and fix.
2954 const MCSymbol *Begin = Range.getStart();
2955 const MCSymbol *End = Range.getEnd();
2956 Begin ? Asm->OutStreamer.EmitSymbolValue(Begin, Size)
2957 : Asm->OutStreamer.EmitIntValue(0, Size);
2958 End ? Asm->OutStreamer.EmitSymbolValue(End, Size)
2959 : Asm->OutStreamer.EmitIntValue(0, Size);
2962 // And terminate the list with two 0 values.
2963 Asm->OutStreamer.EmitIntValue(0, Size);
2964 Asm->OutStreamer.EmitIntValue(0, Size);
2969 // Emit visible names into a debug macinfo section.
2970 void DwarfDebug::emitDebugMacInfo() {
2971 if (const MCSection *LineInfo =
2972 Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
2973 // Start the dwarf macinfo section.
2974 Asm->OutStreamer.SwitchSection(LineInfo);
2978 // DWARF5 Experimental Separate Dwarf emitters.
2980 // This DIE has the following attributes: DW_AT_comp_dir, DW_AT_stmt_list,
2981 // DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges, DW_AT_dwo_name, DW_AT_dwo_id,
2982 // DW_AT_ranges_base, DW_AT_addr_base.
2983 CompileUnit *DwarfDebug::constructSkeletonCU(const CompileUnit *CU) {
2985 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
2986 CompileUnit *NewCU = new CompileUnit(CU->getUniqueID(), Die, CU->getNode(),
2987 Asm, this, &SkeletonHolder);
2989 NewCU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name,
2990 CU->getNode().getSplitDebugFilename());
2992 // Relocate to the beginning of the addr_base section, else 0 for the
2993 // beginning of the one for this compile unit.
2994 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2995 NewCU->addSectionLabel(Die, dwarf::DW_AT_GNU_addr_base,
2996 DwarfAddrSectionSym);
2998 NewCU->addSectionOffset(Die, dwarf::DW_AT_GNU_addr_base, 0);
3000 // 2.17.1 requires that we use DW_AT_low_pc for a single entry point
3001 // into an entity. We're using 0, or a NULL label for this.
3002 NewCU->addUInt(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, 0);
3004 // DW_AT_stmt_list is a offset of line number information for this
3005 // compile unit in debug_line section.
3006 // FIXME: Should handle multiple compile units.
3007 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
3008 NewCU->addSectionLabel(Die, dwarf::DW_AT_stmt_list,
3009 DwarfLineSectionSym);
3011 NewCU->addSectionOffset(Die, dwarf::DW_AT_stmt_list, 0);
3013 if (!CompilationDir.empty())
3014 NewCU->addLocalString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
3016 addGnuPubAttributes(NewCU, Die);
3018 // Attribute if we've emitted any ranges and their location for the compile unit.
3019 if (!CU->getRangeLists().empty())
3020 addSectionLabel(Asm, NewCU, Die, dwarf::DW_AT_GNU_ranges_base,
3021 Asm->GetTempSymbol("gnu_ranges", NewCU->getUniqueID()),
3022 DwarfDebugRangeSectionSym);
3024 SkeletonHolder.addUnit(NewCU);
3029 void DwarfDebug::emitSkeletonAbbrevs(const MCSection *Section) {
3030 assert(useSplitDwarf() && "No split dwarf debug info?");
3031 emitAbbrevs(Section, &SkeletonAbbrevs);
3034 // Emit the .debug_info.dwo section for separated dwarf. This contains the
3035 // compile units that would normally be in debug_info.
3036 void DwarfDebug::emitDebugInfoDWO() {
3037 assert(useSplitDwarf() && "No split dwarf debug info?");
3038 InfoHolder.emitUnits(this, Asm->getObjFileLowering().getDwarfInfoDWOSection(),
3039 Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
3040 DwarfAbbrevDWOSectionSym);
3043 // Emit the .debug_abbrev.dwo section for separated dwarf. This contains the
3044 // abbreviations for the .debug_info.dwo section.
3045 void DwarfDebug::emitDebugAbbrevDWO() {
3046 assert(useSplitDwarf() && "No split dwarf?");
3047 emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
3051 // Emit the .debug_str.dwo section for separated dwarf. This contains the
3052 // string section and is identical in format to traditional .debug_str
3054 void DwarfDebug::emitDebugStrDWO() {
3055 assert(useSplitDwarf() && "No split dwarf?");
3056 const MCSection *OffSec =
3057 Asm->getObjFileLowering().getDwarfStrOffDWOSection();
3058 const MCSymbol *StrSym = DwarfStrSectionSym;
3059 InfoHolder.emitStrings(Asm->getObjFileLowering().getDwarfStrDWOSection(),
3063 void DwarfDebug::addTypeUnitType(uint16_t Language, DIE *RefDie,
3064 DICompositeType CTy) {
3065 DenseMap<const MDNode *,
3066 std::pair<uint64_t, SmallVectorImpl<DIE *> *> >::iterator I =
3067 TypeUnits.find(CTy);
3068 SmallVector<DIE *, 8> References;
3069 References.push_back(RefDie);
3070 if (I != TypeUnits.end()) {
3071 if (I->second.second) {
3072 I->second.second->push_back(RefDie);
3076 DIE *UnitDie = new DIE(dwarf::DW_TAG_type_unit);
3077 TypeUnit *NewTU = new TypeUnit(GlobalCUIndexCount++, UnitDie, Language, Asm,
3079 NewTU->addUInt(UnitDie, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
3082 // Register the type in the TypeUnits map with a vector of references to be
3083 // populated whenever a reference is required.
3084 I = TypeUnits.insert(std::make_pair(CTy, std::make_pair(0, &References)))
3087 // Construct the type, this may, recursively, require more type units that
3088 // may in turn require this type again - in which case they will add DIEs to
3089 // the References vector.
3090 DIE *Die = NewTU->createTypeDIE(CTy);
3092 if (GenerateODRHash && shouldAddODRHash(NewTU, Die))
3093 NewTU->addUInt(UnitDie, dwarf::DW_AT_GNU_odr_signature,
3094 dwarf::DW_FORM_data8,
3095 DIEHash().computeDIEODRSignature(*Die));
3096 // FIXME: This won't handle circularly referential structures, as the DIE
3097 // may have references to other DIEs still under construction and missing
3098 // their signature. Hashing should walk through the signatures to their
3099 // referenced type, or possibly walk the precomputed hashes of related types
3101 uint64_t Signature = DIEHash().computeTypeSignature(*Die);
3103 // Remove the References vector and add the type hash.
3104 I->second.first = Signature;
3105 I->second.second = NULL;
3107 InfoHolder.addUnit(NewTU);
3110 // Populate all the signatures.
3111 for (unsigned i = 0, e = References.size(); i != e; ++i) {
3112 CUMap.begin()->second->addUInt(References[i], dwarf::DW_AT_signature,
3113 dwarf::DW_FORM_ref_sig8, I->second.first);