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 #include "DwarfDebug.h"
16 #include "ByteStreamer.h"
17 #include "DwarfCompileUnit.h"
20 #include "DwarfUnit.h"
21 #include "llvm/ADT/STLExtras.h"
22 #include "llvm/ADT/Statistic.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/ADT/Triple.h"
25 #include "llvm/CodeGen/MachineFunction.h"
26 #include "llvm/CodeGen/MachineModuleInfo.h"
27 #include "llvm/IR/Constants.h"
28 #include "llvm/IR/DIBuilder.h"
29 #include "llvm/IR/DataLayout.h"
30 #include "llvm/IR/DebugInfo.h"
31 #include "llvm/IR/Instructions.h"
32 #include "llvm/IR/Module.h"
33 #include "llvm/IR/ValueHandle.h"
34 #include "llvm/MC/MCAsmInfo.h"
35 #include "llvm/MC/MCSection.h"
36 #include "llvm/MC/MCStreamer.h"
37 #include "llvm/MC/MCSymbol.h"
38 #include "llvm/Support/CommandLine.h"
39 #include "llvm/Support/Debug.h"
40 #include "llvm/Support/Dwarf.h"
41 #include "llvm/Support/Endian.h"
42 #include "llvm/Support/ErrorHandling.h"
43 #include "llvm/Support/FormattedStream.h"
44 #include "llvm/Support/LEB128.h"
45 #include "llvm/Support/MD5.h"
46 #include "llvm/Support/Path.h"
47 #include "llvm/Support/Timer.h"
48 #include "llvm/Target/TargetFrameLowering.h"
49 #include "llvm/Target/TargetLoweringObjectFile.h"
50 #include "llvm/Target/TargetMachine.h"
51 #include "llvm/Target/TargetOptions.h"
52 #include "llvm/Target/TargetRegisterInfo.h"
53 #include "llvm/Target/TargetSubtargetInfo.h"
56 #define DEBUG_TYPE "dwarfdebug"
59 DisableDebugInfoPrinting("disable-debug-info-print", cl::Hidden,
60 cl::desc("Disable debug info printing"));
62 static cl::opt<bool> UnknownLocations(
63 "use-unknown-locations", cl::Hidden,
64 cl::desc("Make an absence of debug location information explicit."),
68 GenerateGnuPubSections("generate-gnu-dwarf-pub-sections", cl::Hidden,
69 cl::desc("Generate GNU-style pubnames and pubtypes"),
72 static cl::opt<bool> GenerateARangeSection("generate-arange-section",
74 cl::desc("Generate dwarf aranges"),
78 enum DefaultOnOff { Default, Enable, Disable };
81 static cl::opt<DefaultOnOff>
82 DwarfAccelTables("dwarf-accel-tables", cl::Hidden,
83 cl::desc("Output prototype dwarf accelerator tables."),
84 cl::values(clEnumVal(Default, "Default for platform"),
85 clEnumVal(Enable, "Enabled"),
86 clEnumVal(Disable, "Disabled"), clEnumValEnd),
89 static cl::opt<DefaultOnOff>
90 SplitDwarf("split-dwarf", cl::Hidden,
91 cl::desc("Output DWARF5 split debug info."),
92 cl::values(clEnumVal(Default, "Default for platform"),
93 clEnumVal(Enable, "Enabled"),
94 clEnumVal(Disable, "Disabled"), clEnumValEnd),
97 static cl::opt<DefaultOnOff>
98 DwarfPubSections("generate-dwarf-pub-sections", cl::Hidden,
99 cl::desc("Generate DWARF pubnames and pubtypes sections"),
100 cl::values(clEnumVal(Default, "Default for platform"),
101 clEnumVal(Enable, "Enabled"),
102 clEnumVal(Disable, "Disabled"), clEnumValEnd),
105 static const char *const DWARFGroupName = "DWARF Emission";
106 static const char *const DbgTimerName = "DWARF Debug Writer";
108 //===----------------------------------------------------------------------===//
110 /// resolve - Look in the DwarfDebug map for the MDNode that
111 /// corresponds to the reference.
112 template <typename T> T DbgVariable::resolve(DIRef<T> Ref) const {
113 return DD->resolve(Ref);
116 bool DbgVariable::isBlockByrefVariable() const {
117 assert(Var.isVariable() && "Invalid complex DbgVariable!");
118 return Var.isBlockByrefVariable(DD->getTypeIdentifierMap());
121 DIType DbgVariable::getType() const {
122 DIType Ty = Var.getType().resolve(DD->getTypeIdentifierMap());
123 // FIXME: isBlockByrefVariable should be reformulated in terms of complex
124 // addresses instead.
125 if (Var.isBlockByrefVariable(DD->getTypeIdentifierMap())) {
126 /* Byref variables, in Blocks, are declared by the programmer as
127 "SomeType VarName;", but the compiler creates a
128 __Block_byref_x_VarName struct, and gives the variable VarName
129 either the struct, or a pointer to the struct, as its type. This
130 is necessary for various behind-the-scenes things the compiler
131 needs to do with by-reference variables in blocks.
133 However, as far as the original *programmer* is concerned, the
134 variable should still have type 'SomeType', as originally declared.
136 The following function dives into the __Block_byref_x_VarName
137 struct to find the original type of the variable. This will be
138 passed back to the code generating the type for the Debug
139 Information Entry for the variable 'VarName'. 'VarName' will then
140 have the original type 'SomeType' in its debug information.
142 The original type 'SomeType' will be the type of the field named
143 'VarName' inside the __Block_byref_x_VarName struct.
145 NOTE: In order for this to not completely fail on the debugger
146 side, the Debug Information Entry for the variable VarName needs to
147 have a DW_AT_location that tells the debugger how to unwind through
148 the pointers and __Block_byref_x_VarName struct to find the actual
149 value of the variable. The function addBlockByrefType does this. */
151 uint16_t tag = Ty.getTag();
153 if (tag == dwarf::DW_TAG_pointer_type)
154 subType = resolve(DIDerivedType(Ty).getTypeDerivedFrom());
156 DIArray Elements = DICompositeType(subType).getElements();
157 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
158 DIDerivedType DT(Elements.getElement(i));
159 if (getName() == DT.getName())
160 return (resolve(DT.getTypeDerivedFrom()));
166 static LLVM_CONSTEXPR DwarfAccelTable::Atom TypeAtoms[] = {
167 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4),
168 DwarfAccelTable::Atom(dwarf::DW_ATOM_die_tag, dwarf::DW_FORM_data2),
169 DwarfAccelTable::Atom(dwarf::DW_ATOM_type_flags, dwarf::DW_FORM_data1)};
171 DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
172 : Asm(A), MMI(Asm->MMI), FirstCU(nullptr), PrevLabel(nullptr),
173 GlobalRangeCount(0), InfoHolder(A, "info_string", DIEValueAllocator),
174 UsedNonDefaultText(false),
175 SkeletonHolder(A, "skel_string", DIEValueAllocator),
176 IsDarwin(Triple(A->getTargetTriple()).isOSDarwin()),
177 AccelNames(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
178 dwarf::DW_FORM_data4)),
179 AccelObjC(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
180 dwarf::DW_FORM_data4)),
181 AccelNamespace(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
182 dwarf::DW_FORM_data4)),
183 AccelTypes(TypeAtoms) {
185 DwarfInfoSectionSym = DwarfAbbrevSectionSym = DwarfStrSectionSym = nullptr;
186 DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = nullptr;
187 DwarfLineSectionSym = nullptr;
188 DwarfAddrSectionSym = nullptr;
189 DwarfAbbrevDWOSectionSym = DwarfStrDWOSectionSym = nullptr;
190 FunctionBeginSym = FunctionEndSym = nullptr;
194 // Turn on accelerator tables for Darwin by default, pubnames by
195 // default for non-Darwin, and handle split dwarf.
196 if (DwarfAccelTables == Default)
197 HasDwarfAccelTables = IsDarwin;
199 HasDwarfAccelTables = DwarfAccelTables == Enable;
201 if (SplitDwarf == Default)
202 HasSplitDwarf = false;
204 HasSplitDwarf = SplitDwarf == Enable;
206 if (DwarfPubSections == Default)
207 HasDwarfPubSections = !IsDarwin;
209 HasDwarfPubSections = DwarfPubSections == Enable;
211 unsigned DwarfVersionNumber = Asm->TM.Options.MCOptions.DwarfVersion;
212 DwarfVersion = DwarfVersionNumber ? DwarfVersionNumber
213 : MMI->getModule()->getDwarfVersion();
215 Asm->OutStreamer.getContext().setDwarfVersion(DwarfVersion);
218 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
223 // Define out of line so we don't have to include DwarfUnit.h in DwarfDebug.h.
224 DwarfDebug::~DwarfDebug() { }
226 // Switch to the specified MCSection and emit an assembler
227 // temporary label to it if SymbolStem is specified.
228 static MCSymbol *emitSectionSym(AsmPrinter *Asm, const MCSection *Section,
229 const char *SymbolStem = nullptr) {
230 Asm->OutStreamer.SwitchSection(Section);
234 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
235 Asm->OutStreamer.EmitLabel(TmpSym);
239 static bool isObjCClass(StringRef Name) {
240 return Name.startswith("+") || Name.startswith("-");
243 static bool hasObjCCategory(StringRef Name) {
244 if (!isObjCClass(Name))
247 return Name.find(") ") != StringRef::npos;
250 static void getObjCClassCategory(StringRef In, StringRef &Class,
251 StringRef &Category) {
252 if (!hasObjCCategory(In)) {
253 Class = In.slice(In.find('[') + 1, In.find(' '));
258 Class = In.slice(In.find('[') + 1, In.find('('));
259 Category = In.slice(In.find('[') + 1, In.find(' '));
263 static StringRef getObjCMethodName(StringRef In) {
264 return In.slice(In.find(' ') + 1, In.find(']'));
267 // Helper for sorting sections into a stable output order.
268 static bool SectionSort(const MCSection *A, const MCSection *B) {
269 std::string LA = (A ? A->getLabelBeginName() : "");
270 std::string LB = (B ? B->getLabelBeginName() : "");
274 // Add the various names to the Dwarf accelerator table names.
275 // TODO: Determine whether or not we should add names for programs
276 // that do not have a DW_AT_name or DW_AT_linkage_name field - this
277 // is only slightly different than the lookup of non-standard ObjC names.
278 void DwarfDebug::addSubprogramNames(DISubprogram SP, DIE &Die) {
279 if (!SP.isDefinition())
281 addAccelName(SP.getName(), Die);
283 // If the linkage name is different than the name, go ahead and output
284 // that as well into the name table.
285 if (SP.getLinkageName() != "" && SP.getName() != SP.getLinkageName())
286 addAccelName(SP.getLinkageName(), Die);
288 // If this is an Objective-C selector name add it to the ObjC accelerator
290 if (isObjCClass(SP.getName())) {
291 StringRef Class, Category;
292 getObjCClassCategory(SP.getName(), Class, Category);
293 addAccelObjC(Class, Die);
295 addAccelObjC(Category, Die);
296 // Also add the base method name to the name table.
297 addAccelName(getObjCMethodName(SP.getName()), Die);
301 /// isSubprogramContext - Return true if Context is either a subprogram
302 /// or another context nested inside a subprogram.
303 bool DwarfDebug::isSubprogramContext(const MDNode *Context) {
306 DIDescriptor D(Context);
307 if (D.isSubprogram())
310 return isSubprogramContext(resolve(DIType(Context).getContext()));
314 /// Check whether we should create a DIE for the given Scope, return true
315 /// if we don't create a DIE (the corresponding DIE is null).
316 bool DwarfDebug::isLexicalScopeDIENull(LexicalScope *Scope) {
317 if (Scope->isAbstractScope())
320 // We don't create a DIE if there is no Range.
321 const SmallVectorImpl<InsnRange> &Ranges = Scope->getRanges();
325 if (Ranges.size() > 1)
328 // We don't create a DIE if we have a single Range and the end label
330 return !getLabelAfterInsn(Ranges.front().second);
333 DIE *DwarfDebug::createScopeChildrenDIE(
334 DwarfCompileUnit &TheCU, LexicalScope *Scope,
335 SmallVectorImpl<std::unique_ptr<DIE>> &Children,
336 unsigned *ChildScopeCount) {
337 DIE *ObjectPointer = nullptr;
339 for (DbgVariable *DV : ScopeVariables.lookup(Scope))
340 Children.push_back(TheCU.constructVariableDIE(*DV, *Scope, ObjectPointer));
342 unsigned ChildCountWithoutScopes = Children.size();
344 for (LexicalScope *LS : Scope->getChildren())
345 TheCU.constructScopeDIE(LS, Children);
348 *ChildScopeCount = Children.size() - ChildCountWithoutScopes;
350 return ObjectPointer;
353 DIE *DwarfDebug::createAndAddScopeChildren(DwarfCompileUnit &TheCU,
354 LexicalScope *Scope, DIE &ScopeDIE) {
355 // We create children when the scope DIE is not null.
356 SmallVector<std::unique_ptr<DIE>, 8> Children;
357 DIE *ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
360 for (auto &I : Children)
361 ScopeDIE.addChild(std::move(I));
363 return ObjectPointer;
366 void DwarfDebug::constructAbstractSubprogramScopeDIE(DwarfCompileUnit &TheCU,
367 LexicalScope *Scope) {
368 assert(Scope && Scope->getScopeNode());
369 assert(Scope->isAbstractScope());
370 assert(!Scope->getInlinedAt());
372 DISubprogram SP(Scope->getScopeNode());
374 ProcessedSPNodes.insert(SP);
376 DIE *&AbsDef = AbstractSPDies[SP];
380 // Find the subprogram's DwarfCompileUnit in the SPMap in case the subprogram
381 // was inlined from another compile unit.
382 DwarfCompileUnit &SPCU = *SPMap[SP];
385 // Some of this is duplicated from DwarfUnit::getOrCreateSubprogramDIE, with
386 // the important distinction that the DIDescriptor is not associated with the
387 // DIE (since the DIDescriptor will be associated with the concrete DIE, if
388 // any). It could be refactored to some common utility function.
389 if (DISubprogram SPDecl = SP.getFunctionDeclaration()) {
390 ContextDIE = &SPCU.getUnitDie();
391 SPCU.getOrCreateSubprogramDIE(SPDecl);
393 ContextDIE = SPCU.getOrCreateContextDIE(resolve(SP.getContext()));
395 // Passing null as the associated DIDescriptor because the abstract definition
396 // shouldn't be found by lookup.
397 AbsDef = &SPCU.createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE,
399 SPCU.applySubprogramAttributesToDefinition(SP, *AbsDef);
401 if (TheCU.getCUNode().getEmissionKind() != DIBuilder::LineTablesOnly)
402 SPCU.addUInt(*AbsDef, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
403 if (DIE *ObjectPointer = createAndAddScopeChildren(SPCU, Scope, *AbsDef))
404 SPCU.addDIEEntry(*AbsDef, dwarf::DW_AT_object_pointer, *ObjectPointer);
407 void DwarfDebug::constructSubprogramScopeDIE(DwarfCompileUnit &TheCU,
408 LexicalScope *Scope) {
409 assert(Scope && Scope->getScopeNode());
410 assert(!Scope->getInlinedAt());
411 assert(!Scope->isAbstractScope());
412 DISubprogram Sub(Scope->getScopeNode());
414 assert(Sub.isSubprogram());
416 ProcessedSPNodes.insert(Sub);
418 DIE &ScopeDIE = TheCU.updateSubprogramScopeDIE(Sub);
420 // Collect arguments for current function.
421 assert(LScopes.isCurrentFunctionScope(Scope));
422 DIE *ObjectPointer = nullptr;
423 for (DbgVariable *ArgDV : CurrentFnArguments)
426 TheCU.constructVariableDIE(*ArgDV, *Scope, ObjectPointer));
428 // If this is a variadic function, add an unspecified parameter.
429 DITypeArray FnArgs = Sub.getType().getTypeArray();
430 // If we have a single element of null, it is a function that returns void.
431 // If we have more than one elements and the last one is null, it is a
432 // variadic function.
433 if (FnArgs.getNumElements() > 1 &&
434 !FnArgs.getElement(FnArgs.getNumElements() - 1))
435 ScopeDIE.addChild(make_unique<DIE>(dwarf::DW_TAG_unspecified_parameters));
437 // Collect lexical scope children first.
438 // ObjectPointer might be a local (non-argument) local variable if it's a
439 // block's synthetic this pointer.
440 if (DIE *BlockObjPtr = createAndAddScopeChildren(TheCU, Scope, ScopeDIE)) {
441 assert(!ObjectPointer && "multiple object pointers can't be described");
442 ObjectPointer = BlockObjPtr;
446 TheCU.addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, *ObjectPointer);
449 void DwarfDebug::addGnuPubAttributes(DwarfUnit &U, DIE &D) const {
450 if (!GenerateGnuPubSections)
453 U.addFlag(D, dwarf::DW_AT_GNU_pubnames);
456 // Create new DwarfCompileUnit for the given metadata node with tag
457 // DW_TAG_compile_unit.
458 DwarfCompileUnit &DwarfDebug::constructDwarfCompileUnit(DICompileUnit DIUnit) {
459 StringRef FN = DIUnit.getFilename();
460 CompilationDir = DIUnit.getDirectory();
462 auto OwnedUnit = make_unique<DwarfCompileUnit>(
463 InfoHolder.getUnits().size(), DIUnit, Asm, this, &InfoHolder);
464 DwarfCompileUnit &NewCU = *OwnedUnit;
465 DIE &Die = NewCU.getUnitDie();
466 InfoHolder.addUnit(std::move(OwnedUnit));
468 // LTO with assembly output shares a single line table amongst multiple CUs.
469 // To avoid the compilation directory being ambiguous, let the line table
470 // explicitly describe the directory of all files, never relying on the
471 // compilation directory.
472 if (!Asm->OutStreamer.hasRawTextSupport() || SingleCU)
473 Asm->OutStreamer.getContext().setMCLineTableCompilationDir(
474 NewCU.getUniqueID(), CompilationDir);
476 NewCU.addString(Die, dwarf::DW_AT_producer, DIUnit.getProducer());
477 NewCU.addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
478 DIUnit.getLanguage());
479 NewCU.addString(Die, dwarf::DW_AT_name, FN);
481 if (!useSplitDwarf()) {
482 NewCU.initStmtList(DwarfLineSectionSym);
484 // If we're using split dwarf the compilation dir is going to be in the
485 // skeleton CU and so we don't need to duplicate it here.
486 if (!CompilationDir.empty())
487 NewCU.addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
489 addGnuPubAttributes(NewCU, Die);
492 if (DIUnit.isOptimized())
493 NewCU.addFlag(Die, dwarf::DW_AT_APPLE_optimized);
495 StringRef Flags = DIUnit.getFlags();
497 NewCU.addString(Die, dwarf::DW_AT_APPLE_flags, Flags);
499 if (unsigned RVer = DIUnit.getRunTimeVersion())
500 NewCU.addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
501 dwarf::DW_FORM_data1, RVer);
506 if (useSplitDwarf()) {
507 NewCU.initSection(Asm->getObjFileLowering().getDwarfInfoDWOSection(),
508 DwarfInfoDWOSectionSym);
509 NewCU.setSkeleton(constructSkeletonCU(NewCU));
511 NewCU.initSection(Asm->getObjFileLowering().getDwarfInfoSection(),
512 DwarfInfoSectionSym);
514 CUMap.insert(std::make_pair(DIUnit, &NewCU));
515 CUDieMap.insert(std::make_pair(&Die, &NewCU));
519 void DwarfDebug::constructAndAddImportedEntityDIE(DwarfCompileUnit &TheCU,
521 DIImportedEntity Module(N);
522 assert(Module.Verify());
523 if (DIE *D = TheCU.getOrCreateContextDIE(Module.getContext()))
524 D->addChild(TheCU.constructImportedEntityDIE(Module));
527 // Emit all Dwarf sections that should come prior to the content. Create
528 // global DIEs and emit initial debug info sections. This is invoked by
529 // the target AsmPrinter.
530 void DwarfDebug::beginModule() {
531 if (DisableDebugInfoPrinting)
534 const Module *M = MMI->getModule();
536 FunctionDIs = makeSubprogramMap(*M);
538 // If module has named metadata anchors then use them, otherwise scan the
539 // module using debug info finder to collect debug info.
540 NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
543 TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
545 // Emit initial sections so we can reference labels later.
548 SingleCU = CU_Nodes->getNumOperands() == 1;
550 for (MDNode *N : CU_Nodes->operands()) {
551 DICompileUnit CUNode(N);
552 DwarfCompileUnit &CU = constructDwarfCompileUnit(CUNode);
553 DIArray ImportedEntities = CUNode.getImportedEntities();
554 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
555 ScopesWithImportedEntities.push_back(std::make_pair(
556 DIImportedEntity(ImportedEntities.getElement(i)).getContext(),
557 ImportedEntities.getElement(i)));
558 std::sort(ScopesWithImportedEntities.begin(),
559 ScopesWithImportedEntities.end(), less_first());
560 DIArray GVs = CUNode.getGlobalVariables();
561 for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i)
562 CU.getOrCreateGlobalVariableDIE(DIGlobalVariable(GVs.getElement(i)));
563 DIArray SPs = CUNode.getSubprograms();
564 for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
565 SPMap.insert(std::make_pair(SPs.getElement(i), &CU));
566 DIArray EnumTypes = CUNode.getEnumTypes();
567 for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i) {
568 DIType Ty(EnumTypes.getElement(i));
569 // The enum types array by design contains pointers to
570 // MDNodes rather than DIRefs. Unique them here.
571 DIType UniqueTy(resolve(Ty.getRef()));
572 CU.getOrCreateTypeDIE(UniqueTy);
574 DIArray RetainedTypes = CUNode.getRetainedTypes();
575 for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i) {
576 DIType Ty(RetainedTypes.getElement(i));
577 // The retained types array by design contains pointers to
578 // MDNodes rather than DIRefs. Unique them here.
579 DIType UniqueTy(resolve(Ty.getRef()));
580 CU.getOrCreateTypeDIE(UniqueTy);
582 // Emit imported_modules last so that the relevant context is already
584 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
585 constructAndAddImportedEntityDIE(CU, ImportedEntities.getElement(i));
588 // Tell MMI that we have debug info.
589 MMI->setDebugInfoAvailability(true);
591 // Prime section data.
592 SectionMap[Asm->getObjFileLowering().getTextSection()];
595 void DwarfDebug::finishVariableDefinitions() {
596 for (const auto &Var : ConcreteVariables) {
597 DIE *VariableDie = Var->getDIE();
599 // FIXME: Consider the time-space tradeoff of just storing the unit pointer
600 // in the ConcreteVariables list, rather than looking it up again here.
601 // DIE::getUnit isn't simple - it walks parent pointers, etc.
602 DwarfCompileUnit *Unit = lookupUnit(VariableDie->getUnit());
604 DbgVariable *AbsVar = getExistingAbstractVariable(Var->getVariable());
605 if (AbsVar && AbsVar->getDIE()) {
606 Unit->addDIEEntry(*VariableDie, dwarf::DW_AT_abstract_origin,
609 Unit->applyVariableAttributes(*Var, *VariableDie);
613 void DwarfDebug::finishSubprogramDefinitions() {
614 const Module *M = MMI->getModule();
616 NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
617 for (MDNode *N : CU_Nodes->operands()) {
618 DICompileUnit TheCU(N);
619 // Construct subprogram DIE and add variables DIEs.
620 DwarfCompileUnit *SPCU =
621 static_cast<DwarfCompileUnit *>(CUMap.lookup(TheCU));
622 DIArray Subprograms = TheCU.getSubprograms();
623 for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
624 DISubprogram SP(Subprograms.getElement(i));
625 // Perhaps the subprogram is in another CU (such as due to comdat
626 // folding, etc), in which case ignore it here.
627 if (SPMap[SP] != SPCU)
629 DIE *D = SPCU->getDIE(SP);
630 if (DIE *AbsSPDIE = AbstractSPDies.lookup(SP)) {
632 // If this subprogram has an abstract definition, reference that
633 SPCU->addDIEEntry(*D, dwarf::DW_AT_abstract_origin, *AbsSPDIE);
635 if (!D && TheCU.getEmissionKind() != DIBuilder::LineTablesOnly)
636 // Lazily construct the subprogram if we didn't see either concrete or
637 // inlined versions during codegen. (except in -gmlt ^ where we want
638 // to omit these entirely)
639 D = SPCU->getOrCreateSubprogramDIE(SP);
641 // And attach the attributes
642 SPCU->applySubprogramAttributesToDefinition(SP, *D);
649 // Collect info for variables that were optimized out.
650 void DwarfDebug::collectDeadVariables() {
651 const Module *M = MMI->getModule();
653 if (NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu")) {
654 for (MDNode *N : CU_Nodes->operands()) {
655 DICompileUnit TheCU(N);
656 // Construct subprogram DIE and add variables DIEs.
657 DwarfCompileUnit *SPCU =
658 static_cast<DwarfCompileUnit *>(CUMap.lookup(TheCU));
659 assert(SPCU && "Unable to find Compile Unit!");
660 DIArray Subprograms = TheCU.getSubprograms();
661 for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
662 DISubprogram SP(Subprograms.getElement(i));
663 if (ProcessedSPNodes.count(SP) != 0)
665 assert(SP.isSubprogram() &&
666 "CU's subprogram list contains a non-subprogram");
667 assert(SP.isDefinition() &&
668 "CU's subprogram list contains a subprogram declaration");
669 DIArray Variables = SP.getVariables();
670 if (Variables.getNumElements() == 0)
673 DIE *SPDIE = AbstractSPDies.lookup(SP);
675 SPDIE = SPCU->getDIE(SP);
677 for (unsigned vi = 0, ve = Variables.getNumElements(); vi != ve; ++vi) {
678 DIVariable DV(Variables.getElement(vi));
679 assert(DV.isVariable());
680 DbgVariable NewVar(DV, DIExpression(nullptr), this);
681 auto VariableDie = SPCU->constructVariableDIE(NewVar);
682 SPCU->applyVariableAttributes(NewVar, *VariableDie);
683 SPDIE->addChild(std::move(VariableDie));
690 void DwarfDebug::finalizeModuleInfo() {
691 finishSubprogramDefinitions();
693 finishVariableDefinitions();
695 // Collect info for variables that were optimized out.
696 collectDeadVariables();
698 // Handle anything that needs to be done on a per-unit basis after
699 // all other generation.
700 for (const auto &TheU : getUnits()) {
701 // Emit DW_AT_containing_type attribute to connect types with their
702 // vtable holding type.
703 TheU->constructContainingTypeDIEs();
705 // Add CU specific attributes if we need to add any.
706 if (TheU->getUnitDie().getTag() == dwarf::DW_TAG_compile_unit) {
707 // If we're splitting the dwarf out now that we've got the entire
708 // CU then add the dwo id to it.
709 DwarfCompileUnit *SkCU =
710 static_cast<DwarfCompileUnit *>(TheU->getSkeleton());
711 if (useSplitDwarf()) {
712 // Emit a unique identifier for this CU.
713 uint64_t ID = DIEHash(Asm).computeCUSignature(TheU->getUnitDie());
714 TheU->addUInt(TheU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
715 dwarf::DW_FORM_data8, ID);
716 SkCU->addUInt(SkCU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
717 dwarf::DW_FORM_data8, ID);
719 // We don't keep track of which addresses are used in which CU so this
720 // is a bit pessimistic under LTO.
721 if (!AddrPool.isEmpty())
722 SkCU->addSectionLabel(SkCU->getUnitDie(), dwarf::DW_AT_GNU_addr_base,
723 DwarfAddrSectionSym, DwarfAddrSectionSym);
724 if (!TheU->getRangeLists().empty())
725 SkCU->addSectionLabel(
726 SkCU->getUnitDie(), dwarf::DW_AT_GNU_ranges_base,
727 DwarfDebugRangeSectionSym, DwarfDebugRangeSectionSym);
730 // If we have code split among multiple sections or non-contiguous
731 // ranges of code then emit a DW_AT_ranges attribute on the unit that will
732 // remain in the .o file, otherwise add a DW_AT_low_pc.
733 // FIXME: We should use ranges allow reordering of code ala
734 // .subsections_via_symbols in mach-o. This would mean turning on
735 // ranges for all subprogram DIEs for mach-o.
736 DwarfCompileUnit &U =
737 SkCU ? *SkCU : static_cast<DwarfCompileUnit &>(*TheU);
738 unsigned NumRanges = TheU->getRanges().size();
741 U.addSectionLabel(U.getUnitDie(), dwarf::DW_AT_ranges,
742 Asm->GetTempSymbol("cu_ranges", U.getUniqueID()),
743 DwarfDebugRangeSectionSym);
745 // A DW_AT_low_pc attribute may also be specified in combination with
746 // DW_AT_ranges to specify the default base address for use in
747 // location lists (see Section 2.6.2) and range lists (see Section
749 U.addUInt(U.getUnitDie(), dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
752 RangeSpan &Range = TheU->getRanges().back();
753 U.attachLowHighPC(U.getUnitDie(), Range.getStart(), Range.getEnd());
759 // Compute DIE offsets and sizes.
760 InfoHolder.computeSizeAndOffsets();
762 SkeletonHolder.computeSizeAndOffsets();
765 void DwarfDebug::endSections() {
766 // Filter labels by section.
767 for (const SymbolCU &SCU : ArangeLabels) {
768 if (SCU.Sym->isInSection()) {
769 // Make a note of this symbol and it's section.
770 const MCSection *Section = &SCU.Sym->getSection();
771 if (!Section->getKind().isMetadata())
772 SectionMap[Section].push_back(SCU);
774 // Some symbols (e.g. common/bss on mach-o) can have no section but still
775 // appear in the output. This sucks as we rely on sections to build
776 // arange spans. We can do it without, but it's icky.
777 SectionMap[nullptr].push_back(SCU);
781 // Build a list of sections used.
782 std::vector<const MCSection *> Sections;
783 for (const auto &it : SectionMap) {
784 const MCSection *Section = it.first;
785 Sections.push_back(Section);
788 // Sort the sections into order.
789 // This is only done to ensure consistent output order across different runs.
790 std::sort(Sections.begin(), Sections.end(), SectionSort);
792 // Add terminating symbols for each section.
793 for (unsigned ID = 0, E = Sections.size(); ID != E; ID++) {
794 const MCSection *Section = Sections[ID];
795 MCSymbol *Sym = nullptr;
798 // We can't call MCSection::getLabelEndName, as it's only safe to do so
799 // if we know the section name up-front. For user-created sections, the
800 // resulting label may not be valid to use as a label. (section names can
801 // use a greater set of characters on some systems)
802 Sym = Asm->GetTempSymbol("debug_end", ID);
803 Asm->OutStreamer.SwitchSection(Section);
804 Asm->OutStreamer.EmitLabel(Sym);
807 // Insert a final terminator.
808 SectionMap[Section].push_back(SymbolCU(nullptr, Sym));
812 // Emit all Dwarf sections that should come after the content.
813 void DwarfDebug::endModule() {
814 assert(CurFn == nullptr);
815 assert(CurMI == nullptr);
820 // End any existing sections.
821 // TODO: Does this need to happen?
824 // Finalize the debug info for the module.
825 finalizeModuleInfo();
829 // Emit all the DIEs into a debug info section.
832 // Corresponding abbreviations into a abbrev section.
835 // Emit info into a debug aranges section.
836 if (GenerateARangeSection)
839 // Emit info into a debug ranges section.
842 if (useSplitDwarf()) {
845 emitDebugAbbrevDWO();
848 // Emit DWO addresses.
849 AddrPool.emit(*Asm, Asm->getObjFileLowering().getDwarfAddrSection());
851 // Emit info into a debug loc section.
854 // Emit info into the dwarf accelerator table sections.
855 if (useDwarfAccelTables()) {
858 emitAccelNamespaces();
862 // Emit the pubnames and pubtypes sections if requested.
863 if (HasDwarfPubSections) {
864 emitDebugPubNames(GenerateGnuPubSections);
865 emitDebugPubTypes(GenerateGnuPubSections);
870 AbstractVariables.clear();
872 // Reset these for the next Module if we have one.
876 // Find abstract variable, if any, associated with Var.
877 DbgVariable *DwarfDebug::getExistingAbstractVariable(const DIVariable &DV,
878 DIVariable &Cleansed) {
879 LLVMContext &Ctx = DV->getContext();
880 // More then one inlined variable corresponds to one abstract variable.
881 // FIXME: This duplication of variables when inlining should probably be
882 // removed. It's done to allow each DIVariable to describe its location
883 // because the DebugLoc on the dbg.value/declare isn't accurate. We should
884 // make it accurate then remove this duplication/cleansing stuff.
885 Cleansed = cleanseInlinedVariable(DV, Ctx);
886 auto I = AbstractVariables.find(Cleansed);
887 if (I != AbstractVariables.end())
888 return I->second.get();
892 DbgVariable *DwarfDebug::getExistingAbstractVariable(const DIVariable &DV) {
894 return getExistingAbstractVariable(DV, Cleansed);
897 void DwarfDebug::createAbstractVariable(const DIVariable &Var,
898 LexicalScope *Scope) {
899 auto AbsDbgVariable = make_unique<DbgVariable>(Var, DIExpression(), this);
900 addScopeVariable(Scope, AbsDbgVariable.get());
901 AbstractVariables[Var] = std::move(AbsDbgVariable);
904 void DwarfDebug::ensureAbstractVariableIsCreated(const DIVariable &DV,
905 const MDNode *ScopeNode) {
906 DIVariable Cleansed = DV;
907 if (getExistingAbstractVariable(DV, Cleansed))
910 createAbstractVariable(Cleansed, LScopes.getOrCreateAbstractScope(ScopeNode));
914 DwarfDebug::ensureAbstractVariableIsCreatedIfScoped(const DIVariable &DV,
915 const MDNode *ScopeNode) {
916 DIVariable Cleansed = DV;
917 if (getExistingAbstractVariable(DV, Cleansed))
920 if (LexicalScope *Scope = LScopes.findAbstractScope(ScopeNode))
921 createAbstractVariable(Cleansed, Scope);
924 // If Var is a current function argument then add it to CurrentFnArguments list.
925 bool DwarfDebug::addCurrentFnArgument(DbgVariable *Var, LexicalScope *Scope) {
926 if (!LScopes.isCurrentFunctionScope(Scope))
928 DIVariable DV = Var->getVariable();
929 if (DV.getTag() != dwarf::DW_TAG_arg_variable)
931 unsigned ArgNo = DV.getArgNumber();
935 size_t Size = CurrentFnArguments.size();
937 CurrentFnArguments.resize(CurFn->getFunction()->arg_size());
938 // llvm::Function argument size is not good indicator of how many
939 // arguments does the function have at source level.
941 CurrentFnArguments.resize(ArgNo * 2);
942 assert(!CurrentFnArguments[ArgNo - 1]);
943 CurrentFnArguments[ArgNo - 1] = Var;
947 // Collect variable information from side table maintained by MMI.
948 void DwarfDebug::collectVariableInfoFromMMITable(
949 SmallPtrSetImpl<const MDNode *> &Processed) {
950 for (const auto &VI : MMI->getVariableDbgInfo()) {
953 Processed.insert(VI.Var);
954 DIVariable DV(VI.Var);
955 DIExpression Expr(VI.Expr);
956 LexicalScope *Scope = LScopes.findLexicalScope(VI.Loc);
958 // If variable scope is not found then skip this variable.
962 ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
963 ConcreteVariables.push_back(make_unique<DbgVariable>(DV, Expr, this));
964 DbgVariable *RegVar = ConcreteVariables.back().get();
965 RegVar->setFrameIndex(VI.Slot);
966 addScopeVariable(Scope, RegVar);
970 // Get .debug_loc entry for the instruction range starting at MI.
971 static DebugLocEntry::Value getDebugLocValue(const MachineInstr *MI) {
972 const MDNode *Expr = MI->getDebugExpression();
973 const MDNode *Var = MI->getDebugVariable();
975 assert(MI->getNumOperands() == 4);
976 if (MI->getOperand(0).isReg()) {
977 MachineLocation MLoc;
978 // If the second operand is an immediate, this is a
979 // register-indirect address.
980 if (!MI->getOperand(1).isImm())
981 MLoc.set(MI->getOperand(0).getReg());
983 MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
984 return DebugLocEntry::Value(Var, Expr, MLoc);
986 if (MI->getOperand(0).isImm())
987 return DebugLocEntry::Value(Var, Expr, MI->getOperand(0).getImm());
988 if (MI->getOperand(0).isFPImm())
989 return DebugLocEntry::Value(Var, Expr, MI->getOperand(0).getFPImm());
990 if (MI->getOperand(0).isCImm())
991 return DebugLocEntry::Value(Var, Expr, MI->getOperand(0).getCImm());
993 llvm_unreachable("Unexpected 4-operand DBG_VALUE instruction!");
996 /// Determine whether two variable pieces overlap.
997 static bool piecesOverlap(DIExpression P1, DIExpression P2) {
998 if (!P1.isVariablePiece() || !P2.isVariablePiece())
1000 unsigned l1 = P1.getPieceOffset();
1001 unsigned l2 = P2.getPieceOffset();
1002 unsigned r1 = l1 + P1.getPieceSize();
1003 unsigned r2 = l2 + P2.getPieceSize();
1004 // True where [l1,r1[ and [r1,r2[ overlap.
1005 return (l1 < r2) && (l2 < r1);
1008 /// Build the location list for all DBG_VALUEs in the function that
1009 /// describe the same variable. If the ranges of several independent
1010 /// pieces of the same variable overlap partially, split them up and
1011 /// combine the ranges. The resulting DebugLocEntries are will have
1012 /// strict monotonically increasing begin addresses and will never
1017 // Ranges History [var, loc, piece ofs size]
1018 // 0 | [x, (reg0, piece 0, 32)]
1019 // 1 | | [x, (reg1, piece 32, 32)] <- IsPieceOfPrevEntry
1021 // 3 | [clobber reg0]
1022 // 4 [x, (mem, piece 0, 64)] <- overlapping with both previous pieces of x.
1026 // [0-1] [x, (reg0, piece 0, 32)]
1027 // [1-3] [x, (reg0, piece 0, 32), (reg1, piece 32, 32)]
1028 // [3-4] [x, (reg1, piece 32, 32)]
1029 // [4- ] [x, (mem, piece 0, 64)]
1031 DwarfDebug::buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
1032 const DbgValueHistoryMap::InstrRanges &Ranges) {
1033 SmallVector<DebugLocEntry::Value, 4> OpenRanges;
1035 for (auto I = Ranges.begin(), E = Ranges.end(); I != E; ++I) {
1036 const MachineInstr *Begin = I->first;
1037 const MachineInstr *End = I->second;
1038 assert(Begin->isDebugValue() && "Invalid History entry");
1040 // Check if a variable is inaccessible in this range.
1041 if (Begin->getNumOperands() > 1 &&
1042 Begin->getOperand(0).isReg() && !Begin->getOperand(0).getReg()) {
1047 // If this piece overlaps with any open ranges, truncate them.
1048 DIExpression DIExpr = Begin->getDebugExpression();
1049 auto Last = std::remove_if(OpenRanges.begin(), OpenRanges.end(),
1050 [&](DebugLocEntry::Value R) {
1051 return piecesOverlap(DIExpr, R.getExpression());
1053 OpenRanges.erase(Last, OpenRanges.end());
1055 const MCSymbol *StartLabel = getLabelBeforeInsn(Begin);
1056 assert(StartLabel && "Forgot label before DBG_VALUE starting a range!");
1058 const MCSymbol *EndLabel;
1060 EndLabel = getLabelAfterInsn(End);
1061 else if (std::next(I) == Ranges.end())
1062 EndLabel = FunctionEndSym;
1064 EndLabel = getLabelBeforeInsn(std::next(I)->first);
1065 assert(EndLabel && "Forgot label after instruction ending a range!");
1067 DEBUG(dbgs() << "DotDebugLoc: " << *Begin << "\n");
1069 auto Value = getDebugLocValue(Begin);
1070 DebugLocEntry Loc(StartLabel, EndLabel, Value);
1071 bool couldMerge = false;
1073 // If this is a piece, it may belong to the current DebugLocEntry.
1074 if (DIExpr.isVariablePiece()) {
1075 // Add this value to the list of open ranges.
1076 OpenRanges.push_back(Value);
1078 // Attempt to add the piece to the last entry.
1079 if (!DebugLoc.empty())
1080 if (DebugLoc.back().MergeValues(Loc))
1085 // Need to add a new DebugLocEntry. Add all values from still
1086 // valid non-overlapping pieces.
1087 if (OpenRanges.size())
1088 Loc.addValues(OpenRanges);
1090 DebugLoc.push_back(std::move(Loc));
1093 // Attempt to coalesce the ranges of two otherwise identical
1095 auto CurEntry = DebugLoc.rbegin();
1096 auto PrevEntry = std::next(CurEntry);
1097 if (PrevEntry != DebugLoc.rend() && PrevEntry->MergeRanges(*CurEntry))
1098 DebugLoc.pop_back();
1101 dbgs() << CurEntry->getValues().size() << " Values:\n";
1102 for (auto Value : CurEntry->getValues()) {
1103 Value.getVariable()->dump();
1104 Value.getExpression()->dump();
1106 dbgs() << "-----\n";
1112 // Find variables for each lexical scope.
1114 DwarfDebug::collectVariableInfo(SmallPtrSetImpl<const MDNode *> &Processed) {
1115 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1116 DwarfCompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1118 // Grab the variable info that was squirreled away in the MMI side-table.
1119 collectVariableInfoFromMMITable(Processed);
1121 for (const auto &I : DbgValues) {
1122 DIVariable DV(I.first);
1123 if (Processed.count(DV))
1126 // Instruction ranges, specifying where DV is accessible.
1127 const auto &Ranges = I.second;
1131 LexicalScope *Scope = nullptr;
1132 if (MDNode *IA = DV.getInlinedAt()) {
1133 DebugLoc DL = DebugLoc::getFromDILocation(IA);
1134 Scope = LScopes.findInlinedScope(DebugLoc::get(
1135 DL.getLine(), DL.getCol(), DV.getContext(), IA));
1137 Scope = LScopes.findLexicalScope(DV.getContext());
1138 // If variable scope is not found then skip this variable.
1142 Processed.insert(DV);
1143 const MachineInstr *MInsn = Ranges.front().first;
1144 assert(MInsn->isDebugValue() && "History must begin with debug value");
1145 ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
1146 ConcreteVariables.push_back(make_unique<DbgVariable>(MInsn, this));
1147 DbgVariable *RegVar = ConcreteVariables.back().get();
1148 addScopeVariable(Scope, RegVar);
1150 // Check if the first DBG_VALUE is valid for the rest of the function.
1151 if (Ranges.size() == 1 && Ranges.front().second == nullptr)
1154 // Handle multiple DBG_VALUE instructions describing one variable.
1155 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1157 DotDebugLocEntries.resize(DotDebugLocEntries.size() + 1);
1158 DebugLocList &LocList = DotDebugLocEntries.back();
1161 Asm->GetTempSymbol("debug_loc", DotDebugLocEntries.size() - 1);
1163 // Build the location list for this variable.
1164 buildLocationList(LocList.List, Ranges);
1167 // Collect info for variables that were optimized out.
1168 DIArray Variables = DISubprogram(FnScope->getScopeNode()).getVariables();
1169 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1170 DIVariable DV(Variables.getElement(i));
1171 assert(DV.isVariable());
1172 if (!Processed.insert(DV))
1174 if (LexicalScope *Scope = LScopes.findLexicalScope(DV.getContext())) {
1175 ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
1176 DIExpression NoExpr;
1177 ConcreteVariables.push_back(make_unique<DbgVariable>(DV, NoExpr, this));
1178 addScopeVariable(Scope, ConcreteVariables.back().get());
1183 // Return Label preceding the instruction.
1184 MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1185 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1186 assert(Label && "Didn't insert label before instruction");
1190 // Return Label immediately following the instruction.
1191 MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1192 return LabelsAfterInsn.lookup(MI);
1195 // Process beginning of an instruction.
1196 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1197 assert(CurMI == nullptr);
1199 // Check if source location changes, but ignore DBG_VALUE locations.
1200 if (!MI->isDebugValue()) {
1201 DebugLoc DL = MI->getDebugLoc();
1202 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1205 if (DL == PrologEndLoc) {
1206 Flags |= DWARF2_FLAG_PROLOGUE_END;
1207 PrologEndLoc = DebugLoc();
1209 if (PrologEndLoc.isUnknown())
1210 Flags |= DWARF2_FLAG_IS_STMT;
1212 if (!DL.isUnknown()) {
1213 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1214 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1216 recordSourceLine(0, 0, nullptr, 0);
1220 // Insert labels where requested.
1221 DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
1222 LabelsBeforeInsn.find(MI);
1225 if (I == LabelsBeforeInsn.end())
1228 // Label already assigned.
1233 PrevLabel = MMI->getContext().CreateTempSymbol();
1234 Asm->OutStreamer.EmitLabel(PrevLabel);
1236 I->second = PrevLabel;
1239 // Process end of an instruction.
1240 void DwarfDebug::endInstruction() {
1241 assert(CurMI != nullptr);
1242 // Don't create a new label after DBG_VALUE instructions.
1243 // They don't generate code.
1244 if (!CurMI->isDebugValue())
1245 PrevLabel = nullptr;
1247 DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
1248 LabelsAfterInsn.find(CurMI);
1252 if (I == LabelsAfterInsn.end())
1255 // Label already assigned.
1259 // We need a label after this instruction.
1261 PrevLabel = MMI->getContext().CreateTempSymbol();
1262 Asm->OutStreamer.EmitLabel(PrevLabel);
1264 I->second = PrevLabel;
1267 // Each LexicalScope has first instruction and last instruction to mark
1268 // beginning and end of a scope respectively. Create an inverse map that list
1269 // scopes starts (and ends) with an instruction. One instruction may start (or
1270 // end) multiple scopes. Ignore scopes that are not reachable.
1271 void DwarfDebug::identifyScopeMarkers() {
1272 SmallVector<LexicalScope *, 4> WorkList;
1273 WorkList.push_back(LScopes.getCurrentFunctionScope());
1274 while (!WorkList.empty()) {
1275 LexicalScope *S = WorkList.pop_back_val();
1277 const SmallVectorImpl<LexicalScope *> &Children = S->getChildren();
1278 if (!Children.empty())
1279 WorkList.append(Children.begin(), Children.end());
1281 if (S->isAbstractScope())
1284 for (const InsnRange &R : S->getRanges()) {
1285 assert(R.first && "InsnRange does not have first instruction!");
1286 assert(R.second && "InsnRange does not have second instruction!");
1287 requestLabelBeforeInsn(R.first);
1288 requestLabelAfterInsn(R.second);
1293 static DebugLoc findPrologueEndLoc(const MachineFunction *MF) {
1294 // First known non-DBG_VALUE and non-frame setup location marks
1295 // the beginning of the function body.
1296 for (const auto &MBB : *MF)
1297 for (const auto &MI : MBB)
1298 if (!MI.isDebugValue() && !MI.getFlag(MachineInstr::FrameSetup) &&
1299 !MI.getDebugLoc().isUnknown())
1300 return MI.getDebugLoc();
1304 // Gather pre-function debug information. Assumes being called immediately
1305 // after the function entry point has been emitted.
1306 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1309 // If there's no debug info for the function we're not going to do anything.
1310 if (!MMI->hasDebugInfo())
1313 auto DI = FunctionDIs.find(MF->getFunction());
1314 if (DI == FunctionDIs.end())
1317 // Grab the lexical scopes for the function, if we don't have any of those
1318 // then we're not going to be able to do anything.
1319 LScopes.initialize(*MF);
1320 if (LScopes.empty())
1323 assert(DbgValues.empty() && "DbgValues map wasn't cleaned!");
1325 // Make sure that each lexical scope will have a begin/end label.
1326 identifyScopeMarkers();
1328 // Set DwarfDwarfCompileUnitID in MCContext to the Compile Unit this function
1329 // belongs to so that we add to the correct per-cu line table in the
1331 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1332 // FnScope->getScopeNode() and DI->second should represent the same function,
1333 // though they may not be the same MDNode due to inline functions merged in
1334 // LTO where the debug info metadata still differs (either due to distinct
1335 // written differences - two versions of a linkonce_odr function
1336 // written/copied into two separate files, or some sub-optimal metadata that
1337 // isn't structurally identical (see: file path/name info from clang, which
1338 // includes the directory of the cpp file being built, even when the file name
1339 // is absolute (such as an <> lookup header)))
1340 DwarfCompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1341 assert(TheCU && "Unable to find compile unit!");
1342 if (Asm->OutStreamer.hasRawTextSupport())
1343 // Use a single line table if we are generating assembly.
1344 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1346 Asm->OutStreamer.getContext().setDwarfCompileUnitID(TheCU->getUniqueID());
1348 // Emit a label for the function so that we have a beginning address.
1349 FunctionBeginSym = Asm->GetTempSymbol("func_begin", Asm->getFunctionNumber());
1350 // Assumes in correct section after the entry point.
1351 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1353 // Calculate history for local variables.
1354 calculateDbgValueHistory(MF, Asm->TM.getSubtargetImpl()->getRegisterInfo(),
1357 // Request labels for the full history.
1358 for (const auto &I : DbgValues) {
1359 const auto &Ranges = I.second;
1363 // The first mention of a function argument gets the FunctionBeginSym
1364 // label, so arguments are visible when breaking at function entry.
1365 DIVariable DIVar(Ranges.front().first->getDebugVariable());
1366 if (DIVar.isVariable() && DIVar.getTag() == dwarf::DW_TAG_arg_variable &&
1367 getDISubprogram(DIVar.getContext()).describes(MF->getFunction())) {
1368 LabelsBeforeInsn[Ranges.front().first] = FunctionBeginSym;
1369 if (Ranges.front().first->getDebugExpression().isVariablePiece()) {
1370 // Mark all non-overlapping initial pieces.
1371 for (auto I = Ranges.begin(); I != Ranges.end(); ++I) {
1372 DIExpression Piece = I->first->getDebugExpression();
1373 if (std::all_of(Ranges.begin(), I,
1374 [&](DbgValueHistoryMap::InstrRange Pred) {
1375 return !piecesOverlap(Piece, Pred.first->getDebugExpression());
1377 LabelsBeforeInsn[I->first] = FunctionBeginSym;
1384 for (const auto &Range : Ranges) {
1385 requestLabelBeforeInsn(Range.first);
1387 requestLabelAfterInsn(Range.second);
1391 PrevInstLoc = DebugLoc();
1392 PrevLabel = FunctionBeginSym;
1394 // Record beginning of function.
1395 PrologEndLoc = findPrologueEndLoc(MF);
1396 if (!PrologEndLoc.isUnknown()) {
1397 DebugLoc FnStartDL =
1398 PrologEndLoc.getFnDebugLoc(MF->getFunction()->getContext());
1400 FnStartDL.getLine(), FnStartDL.getCol(),
1401 FnStartDL.getScope(MF->getFunction()->getContext()),
1402 // We'd like to list the prologue as "not statements" but GDB behaves
1403 // poorly if we do that. Revisit this with caution/GDB (7.5+) testing.
1404 DWARF2_FLAG_IS_STMT);
1408 void DwarfDebug::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
1409 if (addCurrentFnArgument(Var, LS))
1411 SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
1412 DIVariable DV = Var->getVariable();
1413 // Variables with positive arg numbers are parameters.
1414 if (unsigned ArgNum = DV.getArgNumber()) {
1415 // Keep all parameters in order at the start of the variable list to ensure
1416 // function types are correct (no out-of-order parameters)
1418 // This could be improved by only doing it for optimized builds (unoptimized
1419 // builds have the right order to begin with), searching from the back (this
1420 // would catch the unoptimized case quickly), or doing a binary search
1421 // rather than linear search.
1422 SmallVectorImpl<DbgVariable *>::iterator I = Vars.begin();
1423 while (I != Vars.end()) {
1424 unsigned CurNum = (*I)->getVariable().getArgNumber();
1425 // A local (non-parameter) variable has been found, insert immediately
1429 // A later indexed parameter has been found, insert immediately before it.
1430 if (CurNum > ArgNum)
1434 Vars.insert(I, Var);
1438 Vars.push_back(Var);
1441 // Gather and emit post-function debug information.
1442 void DwarfDebug::endFunction(const MachineFunction *MF) {
1443 // Every beginFunction(MF) call should be followed by an endFunction(MF) call,
1444 // though the beginFunction may not be called at all.
1445 // We should handle both cases.
1449 assert(CurFn == MF);
1450 assert(CurFn != nullptr);
1452 if (!MMI->hasDebugInfo() || LScopes.empty() ||
1453 !FunctionDIs.count(MF->getFunction())) {
1454 // If we don't have a lexical scope for this function then there will
1455 // be a hole in the range information. Keep note of this by setting the
1456 // previously used section to nullptr.
1462 // Define end label for subprogram.
1463 FunctionEndSym = Asm->GetTempSymbol("func_end", Asm->getFunctionNumber());
1464 // Assumes in correct section after the entry point.
1465 Asm->OutStreamer.EmitLabel(FunctionEndSym);
1467 // Set DwarfDwarfCompileUnitID in MCContext to default value.
1468 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1470 SmallPtrSet<const MDNode *, 16> ProcessedVars;
1471 collectVariableInfo(ProcessedVars);
1473 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1474 DwarfCompileUnit &TheCU = *SPMap.lookup(FnScope->getScopeNode());
1476 // Add the range of this function to the list of ranges for the CU.
1477 TheCU.addRange(RangeSpan(FunctionBeginSym, FunctionEndSym));
1479 // Under -gmlt, skip building the subprogram if there are no inlined
1480 // subroutines inside it.
1481 if (TheCU.getCUNode().getEmissionKind() == DIBuilder::LineTablesOnly &&
1482 LScopes.getAbstractScopesList().empty() && !IsDarwin) {
1483 assert(ScopeVariables.empty());
1484 assert(CurrentFnArguments.empty());
1485 assert(DbgValues.empty());
1486 assert(AbstractVariables.empty());
1487 LabelsBeforeInsn.clear();
1488 LabelsAfterInsn.clear();
1489 PrevLabel = nullptr;
1494 // Construct abstract scopes.
1495 for (LexicalScope *AScope : LScopes.getAbstractScopesList()) {
1496 DISubprogram SP(AScope->getScopeNode());
1497 assert(SP.isSubprogram());
1498 // Collect info for variables that were optimized out.
1499 DIArray Variables = SP.getVariables();
1500 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1501 DIVariable DV(Variables.getElement(i));
1502 assert(DV && DV.isVariable());
1503 if (!ProcessedVars.insert(DV))
1505 ensureAbstractVariableIsCreated(DV, DV.getContext());
1507 constructAbstractSubprogramScopeDIE(TheCU, AScope);
1510 constructSubprogramScopeDIE(TheCU, FnScope);
1513 // Ownership of DbgVariables is a bit subtle - ScopeVariables owns all the
1514 // DbgVariables except those that are also in AbstractVariables (since they
1515 // can be used cross-function)
1516 ScopeVariables.clear();
1517 CurrentFnArguments.clear();
1519 LabelsBeforeInsn.clear();
1520 LabelsAfterInsn.clear();
1521 PrevLabel = nullptr;
1525 // Register a source line with debug info. Returns the unique label that was
1526 // emitted and which provides correspondence to the source line list.
1527 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
1532 unsigned Discriminator = 0;
1533 if (DIScope Scope = DIScope(S)) {
1534 assert(Scope.isScope());
1535 Fn = Scope.getFilename();
1536 Dir = Scope.getDirectory();
1537 if (Scope.isLexicalBlockFile())
1538 Discriminator = DILexicalBlockFile(S).getDiscriminator();
1540 unsigned CUID = Asm->OutStreamer.getContext().getDwarfCompileUnitID();
1541 Src = static_cast<DwarfCompileUnit &>(*InfoHolder.getUnits()[CUID])
1542 .getOrCreateSourceID(Fn, Dir);
1544 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0,
1548 //===----------------------------------------------------------------------===//
1550 //===----------------------------------------------------------------------===//
1552 // Emit initial Dwarf sections with a label at the start of each one.
1553 void DwarfDebug::emitSectionLabels() {
1554 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1556 // Dwarf sections base addresses.
1557 DwarfInfoSectionSym =
1558 emitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
1559 if (useSplitDwarf()) {
1560 DwarfInfoDWOSectionSym =
1561 emitSectionSym(Asm, TLOF.getDwarfInfoDWOSection(), "section_info_dwo");
1562 DwarfTypesDWOSectionSym =
1563 emitSectionSym(Asm, TLOF.getDwarfTypesDWOSection(), "section_types_dwo");
1565 DwarfAbbrevSectionSym =
1566 emitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
1567 if (useSplitDwarf())
1568 DwarfAbbrevDWOSectionSym = emitSectionSym(
1569 Asm, TLOF.getDwarfAbbrevDWOSection(), "section_abbrev_dwo");
1570 if (GenerateARangeSection)
1571 emitSectionSym(Asm, TLOF.getDwarfARangesSection());
1573 DwarfLineSectionSym =
1574 emitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
1575 if (GenerateGnuPubSections) {
1576 DwarfGnuPubNamesSectionSym =
1577 emitSectionSym(Asm, TLOF.getDwarfGnuPubNamesSection());
1578 DwarfGnuPubTypesSectionSym =
1579 emitSectionSym(Asm, TLOF.getDwarfGnuPubTypesSection());
1580 } else if (HasDwarfPubSections) {
1581 emitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
1582 emitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
1585 DwarfStrSectionSym =
1586 emitSectionSym(Asm, TLOF.getDwarfStrSection(), "info_string");
1587 if (useSplitDwarf()) {
1588 DwarfStrDWOSectionSym =
1589 emitSectionSym(Asm, TLOF.getDwarfStrDWOSection(), "skel_string");
1590 DwarfAddrSectionSym =
1591 emitSectionSym(Asm, TLOF.getDwarfAddrSection(), "addr_sec");
1592 DwarfDebugLocSectionSym =
1593 emitSectionSym(Asm, TLOF.getDwarfLocDWOSection(), "skel_loc");
1595 DwarfDebugLocSectionSym =
1596 emitSectionSym(Asm, TLOF.getDwarfLocSection(), "section_debug_loc");
1597 DwarfDebugRangeSectionSym =
1598 emitSectionSym(Asm, TLOF.getDwarfRangesSection(), "debug_range");
1601 // Recursively emits a debug information entry.
1602 void DwarfDebug::emitDIE(DIE &Die) {
1603 // Get the abbreviation for this DIE.
1604 const DIEAbbrev &Abbrev = Die.getAbbrev();
1606 // Emit the code (index) for the abbreviation.
1607 if (Asm->isVerbose())
1608 Asm->OutStreamer.AddComment("Abbrev [" + Twine(Abbrev.getNumber()) +
1609 "] 0x" + Twine::utohexstr(Die.getOffset()) +
1610 ":0x" + Twine::utohexstr(Die.getSize()) + " " +
1611 dwarf::TagString(Abbrev.getTag()));
1612 Asm->EmitULEB128(Abbrev.getNumber());
1614 const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
1615 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
1617 // Emit the DIE attribute values.
1618 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
1619 dwarf::Attribute Attr = AbbrevData[i].getAttribute();
1620 dwarf::Form Form = AbbrevData[i].getForm();
1621 assert(Form && "Too many attributes for DIE (check abbreviation)");
1623 if (Asm->isVerbose()) {
1624 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
1625 if (Attr == dwarf::DW_AT_accessibility)
1626 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(
1627 cast<DIEInteger>(Values[i])->getValue()));
1630 // Emit an attribute using the defined form.
1631 Values[i]->EmitValue(Asm, Form);
1634 // Emit the DIE children if any.
1635 if (Abbrev.hasChildren()) {
1636 for (auto &Child : Die.getChildren())
1639 Asm->OutStreamer.AddComment("End Of Children Mark");
1644 // Emit the debug info section.
1645 void DwarfDebug::emitDebugInfo() {
1646 DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
1648 Holder.emitUnits(this, DwarfAbbrevSectionSym);
1651 // Emit the abbreviation section.
1652 void DwarfDebug::emitAbbreviations() {
1653 DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
1655 Holder.emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection());
1658 // Emit the last address of the section and the end of the line matrix.
1659 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
1660 // Define last address of section.
1661 Asm->OutStreamer.AddComment("Extended Op");
1664 Asm->OutStreamer.AddComment("Op size");
1665 Asm->EmitInt8(Asm->getDataLayout().getPointerSize() + 1);
1666 Asm->OutStreamer.AddComment("DW_LNE_set_address");
1667 Asm->EmitInt8(dwarf::DW_LNE_set_address);
1669 Asm->OutStreamer.AddComment("Section end label");
1671 Asm->OutStreamer.EmitSymbolValue(
1672 Asm->GetTempSymbol("section_end", SectionEnd),
1673 Asm->getDataLayout().getPointerSize());
1675 // Mark end of matrix.
1676 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
1682 void DwarfDebug::emitAccel(DwarfAccelTable &Accel, const MCSection *Section,
1683 StringRef TableName, StringRef SymName) {
1684 Accel.FinalizeTable(Asm, TableName);
1685 Asm->OutStreamer.SwitchSection(Section);
1686 auto *SectionBegin = Asm->GetTempSymbol(SymName);
1687 Asm->OutStreamer.EmitLabel(SectionBegin);
1689 // Emit the full data.
1690 Accel.Emit(Asm, SectionBegin, &InfoHolder, DwarfStrSectionSym);
1693 // Emit visible names into a hashed accelerator table section.
1694 void DwarfDebug::emitAccelNames() {
1695 emitAccel(AccelNames, Asm->getObjFileLowering().getDwarfAccelNamesSection(),
1696 "Names", "names_begin");
1699 // Emit objective C classes and categories into a hashed accelerator table
1701 void DwarfDebug::emitAccelObjC() {
1702 emitAccel(AccelObjC, Asm->getObjFileLowering().getDwarfAccelObjCSection(),
1703 "ObjC", "objc_begin");
1706 // Emit namespace dies into a hashed accelerator table.
1707 void DwarfDebug::emitAccelNamespaces() {
1708 emitAccel(AccelNamespace,
1709 Asm->getObjFileLowering().getDwarfAccelNamespaceSection(),
1710 "namespac", "namespac_begin");
1713 // Emit type dies into a hashed accelerator table.
1714 void DwarfDebug::emitAccelTypes() {
1715 emitAccel(AccelTypes, Asm->getObjFileLowering().getDwarfAccelTypesSection(),
1716 "types", "types_begin");
1719 // Public name handling.
1720 // The format for the various pubnames:
1722 // dwarf pubnames - offset/name pairs where the offset is the offset into the CU
1723 // for the DIE that is named.
1725 // gnu pubnames - offset/index value/name tuples where the offset is the offset
1726 // into the CU and the index value is computed according to the type of value
1727 // for the DIE that is named.
1729 // For type units the offset is the offset of the skeleton DIE. For split dwarf
1730 // it's the offset within the debug_info/debug_types dwo section, however, the
1731 // reference in the pubname header doesn't change.
1733 /// computeIndexValue - Compute the gdb index value for the DIE and CU.
1734 static dwarf::PubIndexEntryDescriptor computeIndexValue(DwarfUnit *CU,
1736 dwarf::GDBIndexEntryLinkage Linkage = dwarf::GIEL_STATIC;
1738 // We could have a specification DIE that has our most of our knowledge,
1739 // look for that now.
1740 DIEValue *SpecVal = Die->findAttribute(dwarf::DW_AT_specification);
1742 DIE &SpecDIE = cast<DIEEntry>(SpecVal)->getEntry();
1743 if (SpecDIE.findAttribute(dwarf::DW_AT_external))
1744 Linkage = dwarf::GIEL_EXTERNAL;
1745 } else if (Die->findAttribute(dwarf::DW_AT_external))
1746 Linkage = dwarf::GIEL_EXTERNAL;
1748 switch (Die->getTag()) {
1749 case dwarf::DW_TAG_class_type:
1750 case dwarf::DW_TAG_structure_type:
1751 case dwarf::DW_TAG_union_type:
1752 case dwarf::DW_TAG_enumeration_type:
1753 return dwarf::PubIndexEntryDescriptor(
1754 dwarf::GIEK_TYPE, CU->getLanguage() != dwarf::DW_LANG_C_plus_plus
1755 ? dwarf::GIEL_STATIC
1756 : dwarf::GIEL_EXTERNAL);
1757 case dwarf::DW_TAG_typedef:
1758 case dwarf::DW_TAG_base_type:
1759 case dwarf::DW_TAG_subrange_type:
1760 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_TYPE, dwarf::GIEL_STATIC);
1761 case dwarf::DW_TAG_namespace:
1762 return dwarf::GIEK_TYPE;
1763 case dwarf::DW_TAG_subprogram:
1764 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_FUNCTION, Linkage);
1765 case dwarf::DW_TAG_constant:
1766 case dwarf::DW_TAG_variable:
1767 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE, Linkage);
1768 case dwarf::DW_TAG_enumerator:
1769 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE,
1770 dwarf::GIEL_STATIC);
1772 return dwarf::GIEK_NONE;
1776 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
1778 void DwarfDebug::emitDebugPubNames(bool GnuStyle) {
1779 const MCSection *PSec =
1780 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubNamesSection()
1781 : Asm->getObjFileLowering().getDwarfPubNamesSection();
1783 emitDebugPubSection(GnuStyle, PSec, "Names", &DwarfUnit::getGlobalNames);
1786 void DwarfDebug::emitDebugPubSection(
1787 bool GnuStyle, const MCSection *PSec, StringRef Name,
1788 const StringMap<const DIE *> &(DwarfUnit::*Accessor)() const) {
1789 for (const auto &NU : CUMap) {
1790 DwarfCompileUnit *TheU = NU.second;
1792 const auto &Globals = (TheU->*Accessor)();
1794 if (Globals.empty())
1797 if (auto Skeleton = static_cast<DwarfCompileUnit *>(TheU->getSkeleton()))
1799 unsigned ID = TheU->getUniqueID();
1801 // Start the dwarf pubnames section.
1802 Asm->OutStreamer.SwitchSection(PSec);
1805 Asm->OutStreamer.AddComment("Length of Public " + Name + " Info");
1806 MCSymbol *BeginLabel = Asm->GetTempSymbol("pub" + Name + "_begin", ID);
1807 MCSymbol *EndLabel = Asm->GetTempSymbol("pub" + Name + "_end", ID);
1808 Asm->EmitLabelDifference(EndLabel, BeginLabel, 4);
1810 Asm->OutStreamer.EmitLabel(BeginLabel);
1812 Asm->OutStreamer.AddComment("DWARF Version");
1813 Asm->EmitInt16(dwarf::DW_PUBNAMES_VERSION);
1815 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
1816 Asm->EmitSectionOffset(TheU->getLabelBegin(), TheU->getSectionSym());
1818 Asm->OutStreamer.AddComment("Compilation Unit Length");
1819 Asm->EmitLabelDifference(TheU->getLabelEnd(), TheU->getLabelBegin(), 4);
1821 // Emit the pubnames for this compilation unit.
1822 for (const auto &GI : Globals) {
1823 const char *Name = GI.getKeyData();
1824 const DIE *Entity = GI.second;
1826 Asm->OutStreamer.AddComment("DIE offset");
1827 Asm->EmitInt32(Entity->getOffset());
1830 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheU, Entity);
1831 Asm->OutStreamer.AddComment(
1832 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
1833 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
1834 Asm->EmitInt8(Desc.toBits());
1837 Asm->OutStreamer.AddComment("External Name");
1838 Asm->OutStreamer.EmitBytes(StringRef(Name, GI.getKeyLength() + 1));
1841 Asm->OutStreamer.AddComment("End Mark");
1843 Asm->OutStreamer.EmitLabel(EndLabel);
1847 void DwarfDebug::emitDebugPubTypes(bool GnuStyle) {
1848 const MCSection *PSec =
1849 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubTypesSection()
1850 : Asm->getObjFileLowering().getDwarfPubTypesSection();
1852 emitDebugPubSection(GnuStyle, PSec, "Types", &DwarfUnit::getGlobalTypes);
1855 // Emit visible names into a debug str section.
1856 void DwarfDebug::emitDebugStr() {
1857 DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
1858 Holder.emitStrings(Asm->getObjFileLowering().getDwarfStrSection());
1861 /// Emits an optimal (=sorted) sequence of DW_OP_pieces.
1862 void DwarfDebug::emitLocPieces(ByteStreamer &Streamer,
1863 const DITypeIdentifierMap &Map,
1864 ArrayRef<DebugLocEntry::Value> Values) {
1865 assert(std::all_of(Values.begin(), Values.end(), [](DebugLocEntry::Value P) {
1866 return P.isVariablePiece();
1867 }) && "all values are expected to be pieces");
1868 assert(std::is_sorted(Values.begin(), Values.end()) &&
1869 "pieces are expected to be sorted");
1871 unsigned Offset = 0;
1872 for (auto Piece : Values) {
1873 DIExpression Expr = Piece.getExpression();
1874 unsigned PieceOffset = Expr.getPieceOffset();
1875 unsigned PieceSize = Expr.getPieceSize();
1876 assert(Offset <= PieceOffset && "overlapping or duplicate pieces");
1877 if (Offset < PieceOffset) {
1878 // The DWARF spec seriously mandates pieces with no locations for gaps.
1879 Asm->EmitDwarfOpPiece(Streamer, (PieceOffset-Offset)*8);
1880 Offset += PieceOffset-Offset;
1883 Offset += PieceSize;
1885 const unsigned SizeOfByte = 8;
1887 DIVariable Var = Piece.getVariable();
1888 assert(!Var.isIndirect() && "indirect address for piece");
1889 unsigned VarSize = Var.getSizeInBits(Map);
1890 assert(PieceSize+PieceOffset <= VarSize/SizeOfByte
1891 && "piece is larger than or outside of variable");
1892 assert(PieceSize*SizeOfByte != VarSize
1893 && "piece covers entire variable");
1895 if (Piece.isLocation() && Piece.getLoc().isReg())
1896 Asm->EmitDwarfRegOpPiece(Streamer,
1898 PieceSize*SizeOfByte);
1900 emitDebugLocValue(Streamer, Piece);
1901 Asm->EmitDwarfOpPiece(Streamer, PieceSize*SizeOfByte);
1907 void DwarfDebug::emitDebugLocEntry(ByteStreamer &Streamer,
1908 const DebugLocEntry &Entry) {
1909 const DebugLocEntry::Value Value = Entry.getValues()[0];
1910 if (Value.isVariablePiece())
1911 // Emit all pieces that belong to the same variable and range.
1912 return emitLocPieces(Streamer, TypeIdentifierMap, Entry.getValues());
1914 assert(Entry.getValues().size() == 1 && "only pieces may have >1 value");
1915 emitDebugLocValue(Streamer, Value);
1918 void DwarfDebug::emitDebugLocValue(ByteStreamer &Streamer,
1919 const DebugLocEntry::Value &Value) {
1920 DIVariable DV = Value.getVariable();
1922 if (Value.isInt()) {
1923 DIBasicType BTy(resolve(DV.getType()));
1924 if (BTy.Verify() && (BTy.getEncoding() == dwarf::DW_ATE_signed ||
1925 BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
1926 Streamer.EmitInt8(dwarf::DW_OP_consts, "DW_OP_consts");
1927 Streamer.EmitSLEB128(Value.getInt());
1929 Streamer.EmitInt8(dwarf::DW_OP_constu, "DW_OP_constu");
1930 Streamer.EmitULEB128(Value.getInt());
1932 } else if (Value.isLocation()) {
1933 MachineLocation Loc = Value.getLoc();
1934 DIExpression Expr = Value.getExpression();
1937 Asm->EmitDwarfRegOp(Streamer, Loc, DV.isIndirect());
1939 // Complex address entry.
1940 unsigned N = Expr.getNumElements();
1942 if (N >= 2 && Expr.getElement(0) == dwarf::DW_OP_plus) {
1943 if (Loc.getOffset()) {
1945 Asm->EmitDwarfRegOp(Streamer, Loc, DV.isIndirect());
1946 Streamer.EmitInt8(dwarf::DW_OP_deref, "DW_OP_deref");
1947 Streamer.EmitInt8(dwarf::DW_OP_plus_uconst, "DW_OP_plus_uconst");
1948 Streamer.EmitSLEB128(Expr.getElement(1));
1950 // If first address element is OpPlus then emit
1951 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
1952 MachineLocation TLoc(Loc.getReg(), Expr.getElement(1));
1953 Asm->EmitDwarfRegOp(Streamer, TLoc, DV.isIndirect());
1957 Asm->EmitDwarfRegOp(Streamer, Loc, DV.isIndirect());
1960 // Emit remaining complex address elements.
1961 for (; i < N; ++i) {
1962 uint64_t Element = Expr.getElement(i);
1963 if (Element == dwarf::DW_OP_plus) {
1964 Streamer.EmitInt8(dwarf::DW_OP_plus_uconst, "DW_OP_plus_uconst");
1965 Streamer.EmitULEB128(Expr.getElement(++i));
1966 } else if (Element == dwarf::DW_OP_deref) {
1968 Streamer.EmitInt8(dwarf::DW_OP_deref, "DW_OP_deref");
1969 } else if (Element == dwarf::DW_OP_piece) {
1971 // handled in emitDebugLocEntry.
1973 llvm_unreachable("unknown Opcode found in complex address");
1977 // else ... ignore constant fp. There is not any good way to
1978 // to represent them here in dwarf.
1982 void DwarfDebug::emitDebugLocEntryLocation(const DebugLocEntry &Entry) {
1983 Asm->OutStreamer.AddComment("Loc expr size");
1984 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
1985 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
1986 Asm->EmitLabelDifference(end, begin, 2);
1987 Asm->OutStreamer.EmitLabel(begin);
1989 APByteStreamer Streamer(*Asm);
1990 emitDebugLocEntry(Streamer, Entry);
1992 Asm->OutStreamer.EmitLabel(end);
1995 // Emit locations into the debug loc section.
1996 void DwarfDebug::emitDebugLoc() {
1997 // Start the dwarf loc section.
1998 Asm->OutStreamer.SwitchSection(
1999 Asm->getObjFileLowering().getDwarfLocSection());
2000 unsigned char Size = Asm->getDataLayout().getPointerSize();
2001 for (const auto &DebugLoc : DotDebugLocEntries) {
2002 Asm->OutStreamer.EmitLabel(DebugLoc.Label);
2003 const DwarfCompileUnit *CU = DebugLoc.CU;
2004 assert(!CU->getRanges().empty());
2005 for (const auto &Entry : DebugLoc.List) {
2006 // Set up the range. This range is relative to the entry point of the
2007 // compile unit. This is a hard coded 0 for low_pc when we're emitting
2008 // ranges, or the DW_AT_low_pc on the compile unit otherwise.
2009 if (CU->getRanges().size() == 1) {
2010 // Grab the begin symbol from the first range as our base.
2011 const MCSymbol *Base = CU->getRanges()[0].getStart();
2012 Asm->EmitLabelDifference(Entry.getBeginSym(), Base, Size);
2013 Asm->EmitLabelDifference(Entry.getEndSym(), Base, Size);
2015 Asm->OutStreamer.EmitSymbolValue(Entry.getBeginSym(), Size);
2016 Asm->OutStreamer.EmitSymbolValue(Entry.getEndSym(), Size);
2019 emitDebugLocEntryLocation(Entry);
2021 Asm->OutStreamer.EmitIntValue(0, Size);
2022 Asm->OutStreamer.EmitIntValue(0, Size);
2026 void DwarfDebug::emitDebugLocDWO() {
2027 Asm->OutStreamer.SwitchSection(
2028 Asm->getObjFileLowering().getDwarfLocDWOSection());
2029 for (const auto &DebugLoc : DotDebugLocEntries) {
2030 Asm->OutStreamer.EmitLabel(DebugLoc.Label);
2031 for (const auto &Entry : DebugLoc.List) {
2032 // Just always use start_length for now - at least that's one address
2033 // rather than two. We could get fancier and try to, say, reuse an
2034 // address we know we've emitted elsewhere (the start of the function?
2035 // The start of the CU or CU subrange that encloses this range?)
2036 Asm->EmitInt8(dwarf::DW_LLE_start_length_entry);
2037 unsigned idx = AddrPool.getIndex(Entry.getBeginSym());
2038 Asm->EmitULEB128(idx);
2039 Asm->EmitLabelDifference(Entry.getEndSym(), Entry.getBeginSym(), 4);
2041 emitDebugLocEntryLocation(Entry);
2043 Asm->EmitInt8(dwarf::DW_LLE_end_of_list_entry);
2048 const MCSymbol *Start, *End;
2051 // Emit a debug aranges section, containing a CU lookup for any
2052 // address we can tie back to a CU.
2053 void DwarfDebug::emitDebugARanges() {
2054 // Start the dwarf aranges section.
2055 Asm->OutStreamer.SwitchSection(
2056 Asm->getObjFileLowering().getDwarfARangesSection());
2058 typedef DenseMap<DwarfCompileUnit *, std::vector<ArangeSpan>> SpansType;
2062 // Build a list of sections used.
2063 std::vector<const MCSection *> Sections;
2064 for (const auto &it : SectionMap) {
2065 const MCSection *Section = it.first;
2066 Sections.push_back(Section);
2069 // Sort the sections into order.
2070 // This is only done to ensure consistent output order across different runs.
2071 std::sort(Sections.begin(), Sections.end(), SectionSort);
2073 // Build a set of address spans, sorted by CU.
2074 for (const MCSection *Section : Sections) {
2075 SmallVector<SymbolCU, 8> &List = SectionMap[Section];
2076 if (List.size() < 2)
2079 // Sort the symbols by offset within the section.
2080 std::sort(List.begin(), List.end(),
2081 [&](const SymbolCU &A, const SymbolCU &B) {
2082 unsigned IA = A.Sym ? Asm->OutStreamer.GetSymbolOrder(A.Sym) : 0;
2083 unsigned IB = B.Sym ? Asm->OutStreamer.GetSymbolOrder(B.Sym) : 0;
2085 // Symbols with no order assigned should be placed at the end.
2086 // (e.g. section end labels)
2094 // If we have no section (e.g. common), just write out
2095 // individual spans for each symbol.
2097 for (const SymbolCU &Cur : List) {
2099 Span.Start = Cur.Sym;
2102 Spans[Cur.CU].push_back(Span);
2105 // Build spans between each label.
2106 const MCSymbol *StartSym = List[0].Sym;
2107 for (size_t n = 1, e = List.size(); n < e; n++) {
2108 const SymbolCU &Prev = List[n - 1];
2109 const SymbolCU &Cur = List[n];
2111 // Try and build the longest span we can within the same CU.
2112 if (Cur.CU != Prev.CU) {
2114 Span.Start = StartSym;
2116 Spans[Prev.CU].push_back(Span);
2123 unsigned PtrSize = Asm->getDataLayout().getPointerSize();
2125 // Build a list of CUs used.
2126 std::vector<DwarfCompileUnit *> CUs;
2127 for (const auto &it : Spans) {
2128 DwarfCompileUnit *CU = it.first;
2132 // Sort the CU list (again, to ensure consistent output order).
2133 std::sort(CUs.begin(), CUs.end(), [](const DwarfUnit *A, const DwarfUnit *B) {
2134 return A->getUniqueID() < B->getUniqueID();
2137 // Emit an arange table for each CU we used.
2138 for (DwarfCompileUnit *CU : CUs) {
2139 std::vector<ArangeSpan> &List = Spans[CU];
2141 // Emit size of content not including length itself.
2142 unsigned ContentSize =
2143 sizeof(int16_t) + // DWARF ARange version number
2144 sizeof(int32_t) + // Offset of CU in the .debug_info section
2145 sizeof(int8_t) + // Pointer Size (in bytes)
2146 sizeof(int8_t); // Segment Size (in bytes)
2148 unsigned TupleSize = PtrSize * 2;
2150 // 7.20 in the Dwarf specs requires the table to be aligned to a tuple.
2152 OffsetToAlignment(sizeof(int32_t) + ContentSize, TupleSize);
2154 ContentSize += Padding;
2155 ContentSize += (List.size() + 1) * TupleSize;
2157 // For each compile unit, write the list of spans it covers.
2158 Asm->OutStreamer.AddComment("Length of ARange Set");
2159 Asm->EmitInt32(ContentSize);
2160 Asm->OutStreamer.AddComment("DWARF Arange version number");
2161 Asm->EmitInt16(dwarf::DW_ARANGES_VERSION);
2162 Asm->OutStreamer.AddComment("Offset Into Debug Info Section");
2163 Asm->EmitSectionOffset(CU->getLocalLabelBegin(), CU->getLocalSectionSym());
2164 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2165 Asm->EmitInt8(PtrSize);
2166 Asm->OutStreamer.AddComment("Segment Size (in bytes)");
2169 Asm->OutStreamer.EmitFill(Padding, 0xff);
2171 for (const ArangeSpan &Span : List) {
2172 Asm->EmitLabelReference(Span.Start, PtrSize);
2174 // Calculate the size as being from the span start to it's end.
2176 Asm->EmitLabelDifference(Span.End, Span.Start, PtrSize);
2178 // For symbols without an end marker (e.g. common), we
2179 // write a single arange entry containing just that one symbol.
2180 uint64_t Size = SymSize[Span.Start];
2184 Asm->OutStreamer.EmitIntValue(Size, PtrSize);
2188 Asm->OutStreamer.AddComment("ARange terminator");
2189 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2190 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2194 // Emit visible names into a debug ranges section.
2195 void DwarfDebug::emitDebugRanges() {
2196 // Start the dwarf ranges section.
2197 Asm->OutStreamer.SwitchSection(
2198 Asm->getObjFileLowering().getDwarfRangesSection());
2200 // Size for our labels.
2201 unsigned char Size = Asm->getDataLayout().getPointerSize();
2203 // Grab the specific ranges for the compile units in the module.
2204 for (const auto &I : CUMap) {
2205 DwarfCompileUnit *TheCU = I.second;
2207 // Iterate over the misc ranges for the compile units in the module.
2208 for (const RangeSpanList &List : TheCU->getRangeLists()) {
2209 // Emit our symbol so we can find the beginning of the range.
2210 Asm->OutStreamer.EmitLabel(List.getSym());
2212 for (const RangeSpan &Range : List.getRanges()) {
2213 const MCSymbol *Begin = Range.getStart();
2214 const MCSymbol *End = Range.getEnd();
2215 assert(Begin && "Range without a begin symbol?");
2216 assert(End && "Range without an end symbol?");
2217 if (TheCU->getRanges().size() == 1) {
2218 // Grab the begin symbol from the first range as our base.
2219 const MCSymbol *Base = TheCU->getRanges()[0].getStart();
2220 Asm->EmitLabelDifference(Begin, Base, Size);
2221 Asm->EmitLabelDifference(End, Base, Size);
2223 Asm->OutStreamer.EmitSymbolValue(Begin, Size);
2224 Asm->OutStreamer.EmitSymbolValue(End, Size);
2228 // And terminate the list with two 0 values.
2229 Asm->OutStreamer.EmitIntValue(0, Size);
2230 Asm->OutStreamer.EmitIntValue(0, Size);
2233 // Now emit a range for the CU itself.
2234 if (TheCU->getRanges().size() > 1) {
2235 Asm->OutStreamer.EmitLabel(
2236 Asm->GetTempSymbol("cu_ranges", TheCU->getUniqueID()));
2237 for (const RangeSpan &Range : TheCU->getRanges()) {
2238 const MCSymbol *Begin = Range.getStart();
2239 const MCSymbol *End = Range.getEnd();
2240 assert(Begin && "Range without a begin symbol?");
2241 assert(End && "Range without an end symbol?");
2242 Asm->OutStreamer.EmitSymbolValue(Begin, Size);
2243 Asm->OutStreamer.EmitSymbolValue(End, Size);
2245 // And terminate the list with two 0 values.
2246 Asm->OutStreamer.EmitIntValue(0, Size);
2247 Asm->OutStreamer.EmitIntValue(0, Size);
2252 // DWARF5 Experimental Separate Dwarf emitters.
2254 void DwarfDebug::initSkeletonUnit(const DwarfUnit &U, DIE &Die,
2255 std::unique_ptr<DwarfUnit> NewU) {
2256 NewU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name,
2257 U.getCUNode().getSplitDebugFilename());
2259 if (!CompilationDir.empty())
2260 NewU->addLocalString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
2262 addGnuPubAttributes(*NewU, Die);
2264 SkeletonHolder.addUnit(std::move(NewU));
2267 // This DIE has the following attributes: DW_AT_comp_dir, DW_AT_stmt_list,
2268 // DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges, DW_AT_dwo_name, DW_AT_dwo_id,
2269 // DW_AT_addr_base, DW_AT_ranges_base.
2270 DwarfCompileUnit &DwarfDebug::constructSkeletonCU(const DwarfCompileUnit &CU) {
2272 auto OwnedUnit = make_unique<DwarfCompileUnit>(
2273 CU.getUniqueID(), CU.getCUNode(), Asm, this, &SkeletonHolder);
2274 DwarfCompileUnit &NewCU = *OwnedUnit;
2275 NewCU.initSection(Asm->getObjFileLowering().getDwarfInfoSection(),
2276 DwarfInfoSectionSym);
2278 NewCU.initStmtList(DwarfLineSectionSym);
2280 initSkeletonUnit(CU, NewCU.getUnitDie(), std::move(OwnedUnit));
2285 // Emit the .debug_info.dwo section for separated dwarf. This contains the
2286 // compile units that would normally be in debug_info.
2287 void DwarfDebug::emitDebugInfoDWO() {
2288 assert(useSplitDwarf() && "No split dwarf debug info?");
2289 // Don't pass an abbrev symbol, using a constant zero instead so as not to
2290 // emit relocations into the dwo file.
2291 InfoHolder.emitUnits(this, /* AbbrevSymbol */ nullptr);
2294 // Emit the .debug_abbrev.dwo section for separated dwarf. This contains the
2295 // abbreviations for the .debug_info.dwo section.
2296 void DwarfDebug::emitDebugAbbrevDWO() {
2297 assert(useSplitDwarf() && "No split dwarf?");
2298 InfoHolder.emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevDWOSection());
2301 void DwarfDebug::emitDebugLineDWO() {
2302 assert(useSplitDwarf() && "No split dwarf?");
2303 Asm->OutStreamer.SwitchSection(
2304 Asm->getObjFileLowering().getDwarfLineDWOSection());
2305 SplitTypeUnitFileTable.Emit(Asm->OutStreamer);
2308 // Emit the .debug_str.dwo section for separated dwarf. This contains the
2309 // string section and is identical in format to traditional .debug_str
2311 void DwarfDebug::emitDebugStrDWO() {
2312 assert(useSplitDwarf() && "No split dwarf?");
2313 const MCSection *OffSec =
2314 Asm->getObjFileLowering().getDwarfStrOffDWOSection();
2315 InfoHolder.emitStrings(Asm->getObjFileLowering().getDwarfStrDWOSection(),
2319 MCDwarfDwoLineTable *DwarfDebug::getDwoLineTable(const DwarfCompileUnit &CU) {
2320 if (!useSplitDwarf())
2323 SplitTypeUnitFileTable.setCompilationDir(CU.getCUNode().getDirectory());
2324 return &SplitTypeUnitFileTable;
2327 static uint64_t makeTypeSignature(StringRef Identifier) {
2329 Hash.update(Identifier);
2330 // ... take the least significant 8 bytes and return those. Our MD5
2331 // implementation always returns its results in little endian, swap bytes
2333 MD5::MD5Result Result;
2335 return *reinterpret_cast<support::ulittle64_t *>(Result + 8);
2338 void DwarfDebug::addDwarfTypeUnitType(DwarfCompileUnit &CU,
2339 StringRef Identifier, DIE &RefDie,
2340 DICompositeType CTy) {
2341 // Fast path if we're building some type units and one has already used the
2342 // address pool we know we're going to throw away all this work anyway, so
2343 // don't bother building dependent types.
2344 if (!TypeUnitsUnderConstruction.empty() && AddrPool.hasBeenUsed())
2347 const DwarfTypeUnit *&TU = DwarfTypeUnits[CTy];
2349 CU.addDIETypeSignature(RefDie, *TU);
2353 bool TopLevelType = TypeUnitsUnderConstruction.empty();
2354 AddrPool.resetUsedFlag();
2356 auto OwnedUnit = make_unique<DwarfTypeUnit>(
2357 InfoHolder.getUnits().size() + TypeUnitsUnderConstruction.size(), CU, Asm,
2358 this, &InfoHolder, getDwoLineTable(CU));
2359 DwarfTypeUnit &NewTU = *OwnedUnit;
2360 DIE &UnitDie = NewTU.getUnitDie();
2362 TypeUnitsUnderConstruction.push_back(
2363 std::make_pair(std::move(OwnedUnit), CTy));
2365 NewTU.addUInt(UnitDie, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
2368 uint64_t Signature = makeTypeSignature(Identifier);
2369 NewTU.setTypeSignature(Signature);
2371 if (useSplitDwarf())
2372 NewTU.initSection(Asm->getObjFileLowering().getDwarfTypesDWOSection(),
2373 DwarfTypesDWOSectionSym);
2375 CU.applyStmtList(UnitDie);
2377 Asm->getObjFileLowering().getDwarfTypesSection(Signature));
2380 NewTU.setType(NewTU.createTypeDIE(CTy));
2383 auto TypeUnitsToAdd = std::move(TypeUnitsUnderConstruction);
2384 TypeUnitsUnderConstruction.clear();
2386 // Types referencing entries in the address table cannot be placed in type
2388 if (AddrPool.hasBeenUsed()) {
2390 // Remove all the types built while building this type.
2391 // This is pessimistic as some of these types might not be dependent on
2392 // the type that used an address.
2393 for (const auto &TU : TypeUnitsToAdd)
2394 DwarfTypeUnits.erase(TU.second);
2396 // Construct this type in the CU directly.
2397 // This is inefficient because all the dependent types will be rebuilt
2398 // from scratch, including building them in type units, discovering that
2399 // they depend on addresses, throwing them out and rebuilding them.
2400 CU.constructTypeDIE(RefDie, CTy);
2404 // If the type wasn't dependent on fission addresses, finish adding the type
2405 // and all its dependent types.
2406 for (auto &TU : TypeUnitsToAdd)
2407 InfoHolder.addUnit(std::move(TU.first));
2409 CU.addDIETypeSignature(RefDie, NewTU);
2412 // Accelerator table mutators - add each name along with its companion
2413 // DIE to the proper table while ensuring that the name that we're going
2414 // to reference is in the string table. We do this since the names we
2415 // add may not only be identical to the names in the DIE.
2416 void DwarfDebug::addAccelName(StringRef Name, const DIE &Die) {
2417 if (!useDwarfAccelTables())
2419 AccelNames.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
2423 void DwarfDebug::addAccelObjC(StringRef Name, const DIE &Die) {
2424 if (!useDwarfAccelTables())
2426 AccelObjC.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
2430 void DwarfDebug::addAccelNamespace(StringRef Name, const DIE &Die) {
2431 if (!useDwarfAccelTables())
2433 AccelNamespace.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
2437 void DwarfDebug::addAccelType(StringRef Name, const DIE &Die, char Flags) {
2438 if (!useDwarfAccelTables())
2440 AccelTypes.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),