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::createAndAddScopeChildren(DwarfCompileUnit &TheCU,
334 LexicalScope *Scope, DIE &ScopeDIE) {
335 // We create children when the scope DIE is not null.
336 SmallVector<std::unique_ptr<DIE>, 8> Children;
337 DIE *ObjectPointer = TheCU.createScopeChildrenDIE(Scope, Children);
340 for (auto &I : Children)
341 ScopeDIE.addChild(std::move(I));
343 return ObjectPointer;
346 void DwarfDebug::constructAbstractSubprogramScopeDIE(DwarfCompileUnit &TheCU,
347 LexicalScope *Scope) {
348 assert(Scope && Scope->getScopeNode());
349 assert(Scope->isAbstractScope());
350 assert(!Scope->getInlinedAt());
352 DISubprogram SP(Scope->getScopeNode());
354 ProcessedSPNodes.insert(SP);
356 DIE *&AbsDef = AbstractSPDies[SP];
360 // Find the subprogram's DwarfCompileUnit in the SPMap in case the subprogram
361 // was inlined from another compile unit.
362 DwarfCompileUnit &SPCU = *SPMap[SP];
365 // Some of this is duplicated from DwarfUnit::getOrCreateSubprogramDIE, with
366 // the important distinction that the DIDescriptor is not associated with the
367 // DIE (since the DIDescriptor will be associated with the concrete DIE, if
368 // any). It could be refactored to some common utility function.
369 if (DISubprogram SPDecl = SP.getFunctionDeclaration()) {
370 ContextDIE = &SPCU.getUnitDie();
371 SPCU.getOrCreateSubprogramDIE(SPDecl);
373 ContextDIE = SPCU.getOrCreateContextDIE(resolve(SP.getContext()));
375 // Passing null as the associated DIDescriptor because the abstract definition
376 // shouldn't be found by lookup.
377 AbsDef = &SPCU.createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE,
379 SPCU.applySubprogramAttributesToDefinition(SP, *AbsDef);
381 if (TheCU.getCUNode().getEmissionKind() != DIBuilder::LineTablesOnly)
382 SPCU.addUInt(*AbsDef, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
383 if (DIE *ObjectPointer = createAndAddScopeChildren(SPCU, Scope, *AbsDef))
384 SPCU.addDIEEntry(*AbsDef, dwarf::DW_AT_object_pointer, *ObjectPointer);
387 void DwarfDebug::constructSubprogramScopeDIE(DwarfCompileUnit &TheCU,
388 LexicalScope *Scope) {
389 assert(Scope && Scope->getScopeNode());
390 assert(!Scope->getInlinedAt());
391 assert(!Scope->isAbstractScope());
392 DISubprogram Sub(Scope->getScopeNode());
394 assert(Sub.isSubprogram());
396 ProcessedSPNodes.insert(Sub);
398 DIE &ScopeDIE = TheCU.updateSubprogramScopeDIE(Sub);
400 // Collect arguments for current function.
401 assert(LScopes.isCurrentFunctionScope(Scope));
402 DIE *ObjectPointer = nullptr;
403 for (DbgVariable *ArgDV : CurrentFnArguments)
406 TheCU.constructVariableDIE(*ArgDV, *Scope, ObjectPointer));
408 // If this is a variadic function, add an unspecified parameter.
409 DITypeArray FnArgs = Sub.getType().getTypeArray();
410 // If we have a single element of null, it is a function that returns void.
411 // If we have more than one elements and the last one is null, it is a
412 // variadic function.
413 if (FnArgs.getNumElements() > 1 &&
414 !FnArgs.getElement(FnArgs.getNumElements() - 1))
415 ScopeDIE.addChild(make_unique<DIE>(dwarf::DW_TAG_unspecified_parameters));
417 // Collect lexical scope children first.
418 // ObjectPointer might be a local (non-argument) local variable if it's a
419 // block's synthetic this pointer.
420 if (DIE *BlockObjPtr = createAndAddScopeChildren(TheCU, Scope, ScopeDIE)) {
421 assert(!ObjectPointer && "multiple object pointers can't be described");
422 ObjectPointer = BlockObjPtr;
426 TheCU.addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, *ObjectPointer);
429 void DwarfDebug::addGnuPubAttributes(DwarfUnit &U, DIE &D) const {
430 if (!GenerateGnuPubSections)
433 U.addFlag(D, dwarf::DW_AT_GNU_pubnames);
436 // Create new DwarfCompileUnit for the given metadata node with tag
437 // DW_TAG_compile_unit.
438 DwarfCompileUnit &DwarfDebug::constructDwarfCompileUnit(DICompileUnit DIUnit) {
439 StringRef FN = DIUnit.getFilename();
440 CompilationDir = DIUnit.getDirectory();
442 auto OwnedUnit = make_unique<DwarfCompileUnit>(
443 InfoHolder.getUnits().size(), DIUnit, Asm, this, &InfoHolder);
444 DwarfCompileUnit &NewCU = *OwnedUnit;
445 DIE &Die = NewCU.getUnitDie();
446 InfoHolder.addUnit(std::move(OwnedUnit));
448 // LTO with assembly output shares a single line table amongst multiple CUs.
449 // To avoid the compilation directory being ambiguous, let the line table
450 // explicitly describe the directory of all files, never relying on the
451 // compilation directory.
452 if (!Asm->OutStreamer.hasRawTextSupport() || SingleCU)
453 Asm->OutStreamer.getContext().setMCLineTableCompilationDir(
454 NewCU.getUniqueID(), CompilationDir);
456 NewCU.addString(Die, dwarf::DW_AT_producer, DIUnit.getProducer());
457 NewCU.addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
458 DIUnit.getLanguage());
459 NewCU.addString(Die, dwarf::DW_AT_name, FN);
461 if (!useSplitDwarf()) {
462 NewCU.initStmtList(DwarfLineSectionSym);
464 // If we're using split dwarf the compilation dir is going to be in the
465 // skeleton CU and so we don't need to duplicate it here.
466 if (!CompilationDir.empty())
467 NewCU.addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
469 addGnuPubAttributes(NewCU, Die);
472 if (DIUnit.isOptimized())
473 NewCU.addFlag(Die, dwarf::DW_AT_APPLE_optimized);
475 StringRef Flags = DIUnit.getFlags();
477 NewCU.addString(Die, dwarf::DW_AT_APPLE_flags, Flags);
479 if (unsigned RVer = DIUnit.getRunTimeVersion())
480 NewCU.addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
481 dwarf::DW_FORM_data1, RVer);
486 if (useSplitDwarf()) {
487 NewCU.initSection(Asm->getObjFileLowering().getDwarfInfoDWOSection(),
488 DwarfInfoDWOSectionSym);
489 NewCU.setSkeleton(constructSkeletonCU(NewCU));
491 NewCU.initSection(Asm->getObjFileLowering().getDwarfInfoSection(),
492 DwarfInfoSectionSym);
494 CUMap.insert(std::make_pair(DIUnit, &NewCU));
495 CUDieMap.insert(std::make_pair(&Die, &NewCU));
499 void DwarfDebug::constructAndAddImportedEntityDIE(DwarfCompileUnit &TheCU,
501 DIImportedEntity Module(N);
502 assert(Module.Verify());
503 if (DIE *D = TheCU.getOrCreateContextDIE(Module.getContext()))
504 D->addChild(TheCU.constructImportedEntityDIE(Module));
507 // Emit all Dwarf sections that should come prior to the content. Create
508 // global DIEs and emit initial debug info sections. This is invoked by
509 // the target AsmPrinter.
510 void DwarfDebug::beginModule() {
511 if (DisableDebugInfoPrinting)
514 const Module *M = MMI->getModule();
516 FunctionDIs = makeSubprogramMap(*M);
518 // If module has named metadata anchors then use them, otherwise scan the
519 // module using debug info finder to collect debug info.
520 NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
523 TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
525 // Emit initial sections so we can reference labels later.
528 SingleCU = CU_Nodes->getNumOperands() == 1;
530 for (MDNode *N : CU_Nodes->operands()) {
531 DICompileUnit CUNode(N);
532 DwarfCompileUnit &CU = constructDwarfCompileUnit(CUNode);
533 DIArray ImportedEntities = CUNode.getImportedEntities();
534 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
535 ScopesWithImportedEntities.push_back(std::make_pair(
536 DIImportedEntity(ImportedEntities.getElement(i)).getContext(),
537 ImportedEntities.getElement(i)));
538 std::sort(ScopesWithImportedEntities.begin(),
539 ScopesWithImportedEntities.end(), less_first());
540 DIArray GVs = CUNode.getGlobalVariables();
541 for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i)
542 CU.getOrCreateGlobalVariableDIE(DIGlobalVariable(GVs.getElement(i)));
543 DIArray SPs = CUNode.getSubprograms();
544 for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
545 SPMap.insert(std::make_pair(SPs.getElement(i), &CU));
546 DIArray EnumTypes = CUNode.getEnumTypes();
547 for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i) {
548 DIType Ty(EnumTypes.getElement(i));
549 // The enum types array by design contains pointers to
550 // MDNodes rather than DIRefs. Unique them here.
551 DIType UniqueTy(resolve(Ty.getRef()));
552 CU.getOrCreateTypeDIE(UniqueTy);
554 DIArray RetainedTypes = CUNode.getRetainedTypes();
555 for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i) {
556 DIType Ty(RetainedTypes.getElement(i));
557 // The retained types array by design contains pointers to
558 // MDNodes rather than DIRefs. Unique them here.
559 DIType UniqueTy(resolve(Ty.getRef()));
560 CU.getOrCreateTypeDIE(UniqueTy);
562 // Emit imported_modules last so that the relevant context is already
564 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
565 constructAndAddImportedEntityDIE(CU, ImportedEntities.getElement(i));
568 // Tell MMI that we have debug info.
569 MMI->setDebugInfoAvailability(true);
571 // Prime section data.
572 SectionMap[Asm->getObjFileLowering().getTextSection()];
575 void DwarfDebug::finishVariableDefinitions() {
576 for (const auto &Var : ConcreteVariables) {
577 DIE *VariableDie = Var->getDIE();
579 // FIXME: Consider the time-space tradeoff of just storing the unit pointer
580 // in the ConcreteVariables list, rather than looking it up again here.
581 // DIE::getUnit isn't simple - it walks parent pointers, etc.
582 DwarfCompileUnit *Unit = lookupUnit(VariableDie->getUnit());
584 DbgVariable *AbsVar = getExistingAbstractVariable(Var->getVariable());
585 if (AbsVar && AbsVar->getDIE()) {
586 Unit->addDIEEntry(*VariableDie, dwarf::DW_AT_abstract_origin,
589 Unit->applyVariableAttributes(*Var, *VariableDie);
593 void DwarfDebug::finishSubprogramDefinitions() {
594 const Module *M = MMI->getModule();
596 NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
597 for (MDNode *N : CU_Nodes->operands()) {
598 DICompileUnit TheCU(N);
599 // Construct subprogram DIE and add variables DIEs.
600 DwarfCompileUnit *SPCU =
601 static_cast<DwarfCompileUnit *>(CUMap.lookup(TheCU));
602 DIArray Subprograms = TheCU.getSubprograms();
603 for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
604 DISubprogram SP(Subprograms.getElement(i));
605 // Perhaps the subprogram is in another CU (such as due to comdat
606 // folding, etc), in which case ignore it here.
607 if (SPMap[SP] != SPCU)
609 DIE *D = SPCU->getDIE(SP);
610 if (DIE *AbsSPDIE = AbstractSPDies.lookup(SP)) {
612 // If this subprogram has an abstract definition, reference that
613 SPCU->addDIEEntry(*D, dwarf::DW_AT_abstract_origin, *AbsSPDIE);
615 if (!D && TheCU.getEmissionKind() != DIBuilder::LineTablesOnly)
616 // Lazily construct the subprogram if we didn't see either concrete or
617 // inlined versions during codegen. (except in -gmlt ^ where we want
618 // to omit these entirely)
619 D = SPCU->getOrCreateSubprogramDIE(SP);
621 // And attach the attributes
622 SPCU->applySubprogramAttributesToDefinition(SP, *D);
629 // Collect info for variables that were optimized out.
630 void DwarfDebug::collectDeadVariables() {
631 const Module *M = MMI->getModule();
633 if (NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu")) {
634 for (MDNode *N : CU_Nodes->operands()) {
635 DICompileUnit TheCU(N);
636 // Construct subprogram DIE and add variables DIEs.
637 DwarfCompileUnit *SPCU =
638 static_cast<DwarfCompileUnit *>(CUMap.lookup(TheCU));
639 assert(SPCU && "Unable to find Compile Unit!");
640 DIArray Subprograms = TheCU.getSubprograms();
641 for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
642 DISubprogram SP(Subprograms.getElement(i));
643 if (ProcessedSPNodes.count(SP) != 0)
645 assert(SP.isSubprogram() &&
646 "CU's subprogram list contains a non-subprogram");
647 assert(SP.isDefinition() &&
648 "CU's subprogram list contains a subprogram declaration");
649 DIArray Variables = SP.getVariables();
650 if (Variables.getNumElements() == 0)
653 DIE *SPDIE = AbstractSPDies.lookup(SP);
655 SPDIE = SPCU->getDIE(SP);
657 for (unsigned vi = 0, ve = Variables.getNumElements(); vi != ve; ++vi) {
658 DIVariable DV(Variables.getElement(vi));
659 assert(DV.isVariable());
660 DbgVariable NewVar(DV, DIExpression(nullptr), this);
661 auto VariableDie = SPCU->constructVariableDIE(NewVar);
662 SPCU->applyVariableAttributes(NewVar, *VariableDie);
663 SPDIE->addChild(std::move(VariableDie));
670 void DwarfDebug::finalizeModuleInfo() {
671 finishSubprogramDefinitions();
673 finishVariableDefinitions();
675 // Collect info for variables that were optimized out.
676 collectDeadVariables();
678 // Handle anything that needs to be done on a per-unit basis after
679 // all other generation.
680 for (const auto &TheU : getUnits()) {
681 // Emit DW_AT_containing_type attribute to connect types with their
682 // vtable holding type.
683 TheU->constructContainingTypeDIEs();
685 // Add CU specific attributes if we need to add any.
686 if (TheU->getUnitDie().getTag() == dwarf::DW_TAG_compile_unit) {
687 // If we're splitting the dwarf out now that we've got the entire
688 // CU then add the dwo id to it.
689 DwarfCompileUnit *SkCU =
690 static_cast<DwarfCompileUnit *>(TheU->getSkeleton());
691 if (useSplitDwarf()) {
692 // Emit a unique identifier for this CU.
693 uint64_t ID = DIEHash(Asm).computeCUSignature(TheU->getUnitDie());
694 TheU->addUInt(TheU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
695 dwarf::DW_FORM_data8, ID);
696 SkCU->addUInt(SkCU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
697 dwarf::DW_FORM_data8, ID);
699 // We don't keep track of which addresses are used in which CU so this
700 // is a bit pessimistic under LTO.
701 if (!AddrPool.isEmpty())
702 SkCU->addSectionLabel(SkCU->getUnitDie(), dwarf::DW_AT_GNU_addr_base,
703 DwarfAddrSectionSym, DwarfAddrSectionSym);
704 if (!TheU->getRangeLists().empty())
705 SkCU->addSectionLabel(
706 SkCU->getUnitDie(), dwarf::DW_AT_GNU_ranges_base,
707 DwarfDebugRangeSectionSym, DwarfDebugRangeSectionSym);
710 // If we have code split among multiple sections or non-contiguous
711 // ranges of code then emit a DW_AT_ranges attribute on the unit that will
712 // remain in the .o file, otherwise add a DW_AT_low_pc.
713 // FIXME: We should use ranges allow reordering of code ala
714 // .subsections_via_symbols in mach-o. This would mean turning on
715 // ranges for all subprogram DIEs for mach-o.
716 DwarfCompileUnit &U =
717 SkCU ? *SkCU : static_cast<DwarfCompileUnit &>(*TheU);
718 unsigned NumRanges = TheU->getRanges().size();
721 U.addSectionLabel(U.getUnitDie(), dwarf::DW_AT_ranges,
722 Asm->GetTempSymbol("cu_ranges", U.getUniqueID()),
723 DwarfDebugRangeSectionSym);
725 // A DW_AT_low_pc attribute may also be specified in combination with
726 // DW_AT_ranges to specify the default base address for use in
727 // location lists (see Section 2.6.2) and range lists (see Section
729 U.addUInt(U.getUnitDie(), dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
732 RangeSpan &Range = TheU->getRanges().back();
733 U.attachLowHighPC(U.getUnitDie(), Range.getStart(), Range.getEnd());
739 // Compute DIE offsets and sizes.
740 InfoHolder.computeSizeAndOffsets();
742 SkeletonHolder.computeSizeAndOffsets();
745 void DwarfDebug::endSections() {
746 // Filter labels by section.
747 for (const SymbolCU &SCU : ArangeLabels) {
748 if (SCU.Sym->isInSection()) {
749 // Make a note of this symbol and it's section.
750 const MCSection *Section = &SCU.Sym->getSection();
751 if (!Section->getKind().isMetadata())
752 SectionMap[Section].push_back(SCU);
754 // Some symbols (e.g. common/bss on mach-o) can have no section but still
755 // appear in the output. This sucks as we rely on sections to build
756 // arange spans. We can do it without, but it's icky.
757 SectionMap[nullptr].push_back(SCU);
761 // Build a list of sections used.
762 std::vector<const MCSection *> Sections;
763 for (const auto &it : SectionMap) {
764 const MCSection *Section = it.first;
765 Sections.push_back(Section);
768 // Sort the sections into order.
769 // This is only done to ensure consistent output order across different runs.
770 std::sort(Sections.begin(), Sections.end(), SectionSort);
772 // Add terminating symbols for each section.
773 for (unsigned ID = 0, E = Sections.size(); ID != E; ID++) {
774 const MCSection *Section = Sections[ID];
775 MCSymbol *Sym = nullptr;
778 // We can't call MCSection::getLabelEndName, as it's only safe to do so
779 // if we know the section name up-front. For user-created sections, the
780 // resulting label may not be valid to use as a label. (section names can
781 // use a greater set of characters on some systems)
782 Sym = Asm->GetTempSymbol("debug_end", ID);
783 Asm->OutStreamer.SwitchSection(Section);
784 Asm->OutStreamer.EmitLabel(Sym);
787 // Insert a final terminator.
788 SectionMap[Section].push_back(SymbolCU(nullptr, Sym));
792 // Emit all Dwarf sections that should come after the content.
793 void DwarfDebug::endModule() {
794 assert(CurFn == nullptr);
795 assert(CurMI == nullptr);
800 // End any existing sections.
801 // TODO: Does this need to happen?
804 // Finalize the debug info for the module.
805 finalizeModuleInfo();
809 // Emit all the DIEs into a debug info section.
812 // Corresponding abbreviations into a abbrev section.
815 // Emit info into a debug aranges section.
816 if (GenerateARangeSection)
819 // Emit info into a debug ranges section.
822 if (useSplitDwarf()) {
825 emitDebugAbbrevDWO();
828 // Emit DWO addresses.
829 AddrPool.emit(*Asm, Asm->getObjFileLowering().getDwarfAddrSection());
831 // Emit info into a debug loc section.
834 // Emit info into the dwarf accelerator table sections.
835 if (useDwarfAccelTables()) {
838 emitAccelNamespaces();
842 // Emit the pubnames and pubtypes sections if requested.
843 if (HasDwarfPubSections) {
844 emitDebugPubNames(GenerateGnuPubSections);
845 emitDebugPubTypes(GenerateGnuPubSections);
850 AbstractVariables.clear();
852 // Reset these for the next Module if we have one.
856 // Find abstract variable, if any, associated with Var.
857 DbgVariable *DwarfDebug::getExistingAbstractVariable(const DIVariable &DV,
858 DIVariable &Cleansed) {
859 LLVMContext &Ctx = DV->getContext();
860 // More then one inlined variable corresponds to one abstract variable.
861 // FIXME: This duplication of variables when inlining should probably be
862 // removed. It's done to allow each DIVariable to describe its location
863 // because the DebugLoc on the dbg.value/declare isn't accurate. We should
864 // make it accurate then remove this duplication/cleansing stuff.
865 Cleansed = cleanseInlinedVariable(DV, Ctx);
866 auto I = AbstractVariables.find(Cleansed);
867 if (I != AbstractVariables.end())
868 return I->second.get();
872 DbgVariable *DwarfDebug::getExistingAbstractVariable(const DIVariable &DV) {
874 return getExistingAbstractVariable(DV, Cleansed);
877 void DwarfDebug::createAbstractVariable(const DIVariable &Var,
878 LexicalScope *Scope) {
879 auto AbsDbgVariable = make_unique<DbgVariable>(Var, DIExpression(), this);
880 addScopeVariable(Scope, AbsDbgVariable.get());
881 AbstractVariables[Var] = std::move(AbsDbgVariable);
884 void DwarfDebug::ensureAbstractVariableIsCreated(const DIVariable &DV,
885 const MDNode *ScopeNode) {
886 DIVariable Cleansed = DV;
887 if (getExistingAbstractVariable(DV, Cleansed))
890 createAbstractVariable(Cleansed, LScopes.getOrCreateAbstractScope(ScopeNode));
894 DwarfDebug::ensureAbstractVariableIsCreatedIfScoped(const DIVariable &DV,
895 const MDNode *ScopeNode) {
896 DIVariable Cleansed = DV;
897 if (getExistingAbstractVariable(DV, Cleansed))
900 if (LexicalScope *Scope = LScopes.findAbstractScope(ScopeNode))
901 createAbstractVariable(Cleansed, Scope);
904 // If Var is a current function argument then add it to CurrentFnArguments list.
905 bool DwarfDebug::addCurrentFnArgument(DbgVariable *Var, LexicalScope *Scope) {
906 if (!LScopes.isCurrentFunctionScope(Scope))
908 DIVariable DV = Var->getVariable();
909 if (DV.getTag() != dwarf::DW_TAG_arg_variable)
911 unsigned ArgNo = DV.getArgNumber();
915 size_t Size = CurrentFnArguments.size();
917 CurrentFnArguments.resize(CurFn->getFunction()->arg_size());
918 // llvm::Function argument size is not good indicator of how many
919 // arguments does the function have at source level.
921 CurrentFnArguments.resize(ArgNo * 2);
922 assert(!CurrentFnArguments[ArgNo - 1]);
923 CurrentFnArguments[ArgNo - 1] = Var;
927 // Collect variable information from side table maintained by MMI.
928 void DwarfDebug::collectVariableInfoFromMMITable(
929 SmallPtrSetImpl<const MDNode *> &Processed) {
930 for (const auto &VI : MMI->getVariableDbgInfo()) {
933 Processed.insert(VI.Var);
934 DIVariable DV(VI.Var);
935 DIExpression Expr(VI.Expr);
936 LexicalScope *Scope = LScopes.findLexicalScope(VI.Loc);
938 // If variable scope is not found then skip this variable.
942 ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
943 ConcreteVariables.push_back(make_unique<DbgVariable>(DV, Expr, this));
944 DbgVariable *RegVar = ConcreteVariables.back().get();
945 RegVar->setFrameIndex(VI.Slot);
946 addScopeVariable(Scope, RegVar);
950 // Get .debug_loc entry for the instruction range starting at MI.
951 static DebugLocEntry::Value getDebugLocValue(const MachineInstr *MI) {
952 const MDNode *Expr = MI->getDebugExpression();
953 const MDNode *Var = MI->getDebugVariable();
955 assert(MI->getNumOperands() == 4);
956 if (MI->getOperand(0).isReg()) {
957 MachineLocation MLoc;
958 // If the second operand is an immediate, this is a
959 // register-indirect address.
960 if (!MI->getOperand(1).isImm())
961 MLoc.set(MI->getOperand(0).getReg());
963 MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
964 return DebugLocEntry::Value(Var, Expr, MLoc);
966 if (MI->getOperand(0).isImm())
967 return DebugLocEntry::Value(Var, Expr, MI->getOperand(0).getImm());
968 if (MI->getOperand(0).isFPImm())
969 return DebugLocEntry::Value(Var, Expr, MI->getOperand(0).getFPImm());
970 if (MI->getOperand(0).isCImm())
971 return DebugLocEntry::Value(Var, Expr, MI->getOperand(0).getCImm());
973 llvm_unreachable("Unexpected 4-operand DBG_VALUE instruction!");
976 /// Determine whether two variable pieces overlap.
977 static bool piecesOverlap(DIExpression P1, DIExpression P2) {
978 if (!P1.isVariablePiece() || !P2.isVariablePiece())
980 unsigned l1 = P1.getPieceOffset();
981 unsigned l2 = P2.getPieceOffset();
982 unsigned r1 = l1 + P1.getPieceSize();
983 unsigned r2 = l2 + P2.getPieceSize();
984 // True where [l1,r1[ and [r1,r2[ overlap.
985 return (l1 < r2) && (l2 < r1);
988 /// Build the location list for all DBG_VALUEs in the function that
989 /// describe the same variable. If the ranges of several independent
990 /// pieces of the same variable overlap partially, split them up and
991 /// combine the ranges. The resulting DebugLocEntries are will have
992 /// strict monotonically increasing begin addresses and will never
997 // Ranges History [var, loc, piece ofs size]
998 // 0 | [x, (reg0, piece 0, 32)]
999 // 1 | | [x, (reg1, piece 32, 32)] <- IsPieceOfPrevEntry
1001 // 3 | [clobber reg0]
1002 // 4 [x, (mem, piece 0, 64)] <- overlapping with both previous pieces of x.
1006 // [0-1] [x, (reg0, piece 0, 32)]
1007 // [1-3] [x, (reg0, piece 0, 32), (reg1, piece 32, 32)]
1008 // [3-4] [x, (reg1, piece 32, 32)]
1009 // [4- ] [x, (mem, piece 0, 64)]
1011 DwarfDebug::buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
1012 const DbgValueHistoryMap::InstrRanges &Ranges) {
1013 SmallVector<DebugLocEntry::Value, 4> OpenRanges;
1015 for (auto I = Ranges.begin(), E = Ranges.end(); I != E; ++I) {
1016 const MachineInstr *Begin = I->first;
1017 const MachineInstr *End = I->second;
1018 assert(Begin->isDebugValue() && "Invalid History entry");
1020 // Check if a variable is inaccessible in this range.
1021 if (Begin->getNumOperands() > 1 &&
1022 Begin->getOperand(0).isReg() && !Begin->getOperand(0).getReg()) {
1027 // If this piece overlaps with any open ranges, truncate them.
1028 DIExpression DIExpr = Begin->getDebugExpression();
1029 auto Last = std::remove_if(OpenRanges.begin(), OpenRanges.end(),
1030 [&](DebugLocEntry::Value R) {
1031 return piecesOverlap(DIExpr, R.getExpression());
1033 OpenRanges.erase(Last, OpenRanges.end());
1035 const MCSymbol *StartLabel = getLabelBeforeInsn(Begin);
1036 assert(StartLabel && "Forgot label before DBG_VALUE starting a range!");
1038 const MCSymbol *EndLabel;
1040 EndLabel = getLabelAfterInsn(End);
1041 else if (std::next(I) == Ranges.end())
1042 EndLabel = FunctionEndSym;
1044 EndLabel = getLabelBeforeInsn(std::next(I)->first);
1045 assert(EndLabel && "Forgot label after instruction ending a range!");
1047 DEBUG(dbgs() << "DotDebugLoc: " << *Begin << "\n");
1049 auto Value = getDebugLocValue(Begin);
1050 DebugLocEntry Loc(StartLabel, EndLabel, Value);
1051 bool couldMerge = false;
1053 // If this is a piece, it may belong to the current DebugLocEntry.
1054 if (DIExpr.isVariablePiece()) {
1055 // Add this value to the list of open ranges.
1056 OpenRanges.push_back(Value);
1058 // Attempt to add the piece to the last entry.
1059 if (!DebugLoc.empty())
1060 if (DebugLoc.back().MergeValues(Loc))
1065 // Need to add a new DebugLocEntry. Add all values from still
1066 // valid non-overlapping pieces.
1067 if (OpenRanges.size())
1068 Loc.addValues(OpenRanges);
1070 DebugLoc.push_back(std::move(Loc));
1073 // Attempt to coalesce the ranges of two otherwise identical
1075 auto CurEntry = DebugLoc.rbegin();
1076 auto PrevEntry = std::next(CurEntry);
1077 if (PrevEntry != DebugLoc.rend() && PrevEntry->MergeRanges(*CurEntry))
1078 DebugLoc.pop_back();
1081 dbgs() << CurEntry->getValues().size() << " Values:\n";
1082 for (auto Value : CurEntry->getValues()) {
1083 Value.getVariable()->dump();
1084 Value.getExpression()->dump();
1086 dbgs() << "-----\n";
1092 // Find variables for each lexical scope.
1094 DwarfDebug::collectVariableInfo(SmallPtrSetImpl<const MDNode *> &Processed) {
1095 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1096 DwarfCompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1098 // Grab the variable info that was squirreled away in the MMI side-table.
1099 collectVariableInfoFromMMITable(Processed);
1101 for (const auto &I : DbgValues) {
1102 DIVariable DV(I.first);
1103 if (Processed.count(DV))
1106 // Instruction ranges, specifying where DV is accessible.
1107 const auto &Ranges = I.second;
1111 LexicalScope *Scope = nullptr;
1112 if (MDNode *IA = DV.getInlinedAt()) {
1113 DebugLoc DL = DebugLoc::getFromDILocation(IA);
1114 Scope = LScopes.findInlinedScope(DebugLoc::get(
1115 DL.getLine(), DL.getCol(), DV.getContext(), IA));
1117 Scope = LScopes.findLexicalScope(DV.getContext());
1118 // If variable scope is not found then skip this variable.
1122 Processed.insert(DV);
1123 const MachineInstr *MInsn = Ranges.front().first;
1124 assert(MInsn->isDebugValue() && "History must begin with debug value");
1125 ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
1126 ConcreteVariables.push_back(make_unique<DbgVariable>(MInsn, this));
1127 DbgVariable *RegVar = ConcreteVariables.back().get();
1128 addScopeVariable(Scope, RegVar);
1130 // Check if the first DBG_VALUE is valid for the rest of the function.
1131 if (Ranges.size() == 1 && Ranges.front().second == nullptr)
1134 // Handle multiple DBG_VALUE instructions describing one variable.
1135 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1137 DotDebugLocEntries.resize(DotDebugLocEntries.size() + 1);
1138 DebugLocList &LocList = DotDebugLocEntries.back();
1141 Asm->GetTempSymbol("debug_loc", DotDebugLocEntries.size() - 1);
1143 // Build the location list for this variable.
1144 buildLocationList(LocList.List, Ranges);
1147 // Collect info for variables that were optimized out.
1148 DIArray Variables = DISubprogram(FnScope->getScopeNode()).getVariables();
1149 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1150 DIVariable DV(Variables.getElement(i));
1151 assert(DV.isVariable());
1152 if (!Processed.insert(DV))
1154 if (LexicalScope *Scope = LScopes.findLexicalScope(DV.getContext())) {
1155 ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
1156 DIExpression NoExpr;
1157 ConcreteVariables.push_back(make_unique<DbgVariable>(DV, NoExpr, this));
1158 addScopeVariable(Scope, ConcreteVariables.back().get());
1163 // Return Label preceding the instruction.
1164 MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1165 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1166 assert(Label && "Didn't insert label before instruction");
1170 // Return Label immediately following the instruction.
1171 MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1172 return LabelsAfterInsn.lookup(MI);
1175 // Process beginning of an instruction.
1176 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1177 assert(CurMI == nullptr);
1179 // Check if source location changes, but ignore DBG_VALUE locations.
1180 if (!MI->isDebugValue()) {
1181 DebugLoc DL = MI->getDebugLoc();
1182 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1185 if (DL == PrologEndLoc) {
1186 Flags |= DWARF2_FLAG_PROLOGUE_END;
1187 PrologEndLoc = DebugLoc();
1189 if (PrologEndLoc.isUnknown())
1190 Flags |= DWARF2_FLAG_IS_STMT;
1192 if (!DL.isUnknown()) {
1193 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1194 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1196 recordSourceLine(0, 0, nullptr, 0);
1200 // Insert labels where requested.
1201 DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
1202 LabelsBeforeInsn.find(MI);
1205 if (I == LabelsBeforeInsn.end())
1208 // Label already assigned.
1213 PrevLabel = MMI->getContext().CreateTempSymbol();
1214 Asm->OutStreamer.EmitLabel(PrevLabel);
1216 I->second = PrevLabel;
1219 // Process end of an instruction.
1220 void DwarfDebug::endInstruction() {
1221 assert(CurMI != nullptr);
1222 // Don't create a new label after DBG_VALUE instructions.
1223 // They don't generate code.
1224 if (!CurMI->isDebugValue())
1225 PrevLabel = nullptr;
1227 DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
1228 LabelsAfterInsn.find(CurMI);
1232 if (I == LabelsAfterInsn.end())
1235 // Label already assigned.
1239 // We need a label after this instruction.
1241 PrevLabel = MMI->getContext().CreateTempSymbol();
1242 Asm->OutStreamer.EmitLabel(PrevLabel);
1244 I->second = PrevLabel;
1247 // Each LexicalScope has first instruction and last instruction to mark
1248 // beginning and end of a scope respectively. Create an inverse map that list
1249 // scopes starts (and ends) with an instruction. One instruction may start (or
1250 // end) multiple scopes. Ignore scopes that are not reachable.
1251 void DwarfDebug::identifyScopeMarkers() {
1252 SmallVector<LexicalScope *, 4> WorkList;
1253 WorkList.push_back(LScopes.getCurrentFunctionScope());
1254 while (!WorkList.empty()) {
1255 LexicalScope *S = WorkList.pop_back_val();
1257 const SmallVectorImpl<LexicalScope *> &Children = S->getChildren();
1258 if (!Children.empty())
1259 WorkList.append(Children.begin(), Children.end());
1261 if (S->isAbstractScope())
1264 for (const InsnRange &R : S->getRanges()) {
1265 assert(R.first && "InsnRange does not have first instruction!");
1266 assert(R.second && "InsnRange does not have second instruction!");
1267 requestLabelBeforeInsn(R.first);
1268 requestLabelAfterInsn(R.second);
1273 static DebugLoc findPrologueEndLoc(const MachineFunction *MF) {
1274 // First known non-DBG_VALUE and non-frame setup location marks
1275 // the beginning of the function body.
1276 for (const auto &MBB : *MF)
1277 for (const auto &MI : MBB)
1278 if (!MI.isDebugValue() && !MI.getFlag(MachineInstr::FrameSetup) &&
1279 !MI.getDebugLoc().isUnknown())
1280 return MI.getDebugLoc();
1284 // Gather pre-function debug information. Assumes being called immediately
1285 // after the function entry point has been emitted.
1286 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1289 // If there's no debug info for the function we're not going to do anything.
1290 if (!MMI->hasDebugInfo())
1293 auto DI = FunctionDIs.find(MF->getFunction());
1294 if (DI == FunctionDIs.end())
1297 // Grab the lexical scopes for the function, if we don't have any of those
1298 // then we're not going to be able to do anything.
1299 LScopes.initialize(*MF);
1300 if (LScopes.empty())
1303 assert(DbgValues.empty() && "DbgValues map wasn't cleaned!");
1305 // Make sure that each lexical scope will have a begin/end label.
1306 identifyScopeMarkers();
1308 // Set DwarfDwarfCompileUnitID in MCContext to the Compile Unit this function
1309 // belongs to so that we add to the correct per-cu line table in the
1311 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1312 // FnScope->getScopeNode() and DI->second should represent the same function,
1313 // though they may not be the same MDNode due to inline functions merged in
1314 // LTO where the debug info metadata still differs (either due to distinct
1315 // written differences - two versions of a linkonce_odr function
1316 // written/copied into two separate files, or some sub-optimal metadata that
1317 // isn't structurally identical (see: file path/name info from clang, which
1318 // includes the directory of the cpp file being built, even when the file name
1319 // is absolute (such as an <> lookup header)))
1320 DwarfCompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1321 assert(TheCU && "Unable to find compile unit!");
1322 if (Asm->OutStreamer.hasRawTextSupport())
1323 // Use a single line table if we are generating assembly.
1324 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1326 Asm->OutStreamer.getContext().setDwarfCompileUnitID(TheCU->getUniqueID());
1328 // Emit a label for the function so that we have a beginning address.
1329 FunctionBeginSym = Asm->GetTempSymbol("func_begin", Asm->getFunctionNumber());
1330 // Assumes in correct section after the entry point.
1331 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1333 // Calculate history for local variables.
1334 calculateDbgValueHistory(MF, Asm->TM.getSubtargetImpl()->getRegisterInfo(),
1337 // Request labels for the full history.
1338 for (const auto &I : DbgValues) {
1339 const auto &Ranges = I.second;
1343 // The first mention of a function argument gets the FunctionBeginSym
1344 // label, so arguments are visible when breaking at function entry.
1345 DIVariable DIVar(Ranges.front().first->getDebugVariable());
1346 if (DIVar.isVariable() && DIVar.getTag() == dwarf::DW_TAG_arg_variable &&
1347 getDISubprogram(DIVar.getContext()).describes(MF->getFunction())) {
1348 LabelsBeforeInsn[Ranges.front().first] = FunctionBeginSym;
1349 if (Ranges.front().first->getDebugExpression().isVariablePiece()) {
1350 // Mark all non-overlapping initial pieces.
1351 for (auto I = Ranges.begin(); I != Ranges.end(); ++I) {
1352 DIExpression Piece = I->first->getDebugExpression();
1353 if (std::all_of(Ranges.begin(), I,
1354 [&](DbgValueHistoryMap::InstrRange Pred) {
1355 return !piecesOverlap(Piece, Pred.first->getDebugExpression());
1357 LabelsBeforeInsn[I->first] = FunctionBeginSym;
1364 for (const auto &Range : Ranges) {
1365 requestLabelBeforeInsn(Range.first);
1367 requestLabelAfterInsn(Range.second);
1371 PrevInstLoc = DebugLoc();
1372 PrevLabel = FunctionBeginSym;
1374 // Record beginning of function.
1375 PrologEndLoc = findPrologueEndLoc(MF);
1376 if (!PrologEndLoc.isUnknown()) {
1377 DebugLoc FnStartDL =
1378 PrologEndLoc.getFnDebugLoc(MF->getFunction()->getContext());
1380 FnStartDL.getLine(), FnStartDL.getCol(),
1381 FnStartDL.getScope(MF->getFunction()->getContext()),
1382 // We'd like to list the prologue as "not statements" but GDB behaves
1383 // poorly if we do that. Revisit this with caution/GDB (7.5+) testing.
1384 DWARF2_FLAG_IS_STMT);
1388 void DwarfDebug::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
1389 if (addCurrentFnArgument(Var, LS))
1391 SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
1392 DIVariable DV = Var->getVariable();
1393 // Variables with positive arg numbers are parameters.
1394 if (unsigned ArgNum = DV.getArgNumber()) {
1395 // Keep all parameters in order at the start of the variable list to ensure
1396 // function types are correct (no out-of-order parameters)
1398 // This could be improved by only doing it for optimized builds (unoptimized
1399 // builds have the right order to begin with), searching from the back (this
1400 // would catch the unoptimized case quickly), or doing a binary search
1401 // rather than linear search.
1402 SmallVectorImpl<DbgVariable *>::iterator I = Vars.begin();
1403 while (I != Vars.end()) {
1404 unsigned CurNum = (*I)->getVariable().getArgNumber();
1405 // A local (non-parameter) variable has been found, insert immediately
1409 // A later indexed parameter has been found, insert immediately before it.
1410 if (CurNum > ArgNum)
1414 Vars.insert(I, Var);
1418 Vars.push_back(Var);
1421 // Gather and emit post-function debug information.
1422 void DwarfDebug::endFunction(const MachineFunction *MF) {
1423 // Every beginFunction(MF) call should be followed by an endFunction(MF) call,
1424 // though the beginFunction may not be called at all.
1425 // We should handle both cases.
1429 assert(CurFn == MF);
1430 assert(CurFn != nullptr);
1432 if (!MMI->hasDebugInfo() || LScopes.empty() ||
1433 !FunctionDIs.count(MF->getFunction())) {
1434 // If we don't have a lexical scope for this function then there will
1435 // be a hole in the range information. Keep note of this by setting the
1436 // previously used section to nullptr.
1442 // Define end label for subprogram.
1443 FunctionEndSym = Asm->GetTempSymbol("func_end", Asm->getFunctionNumber());
1444 // Assumes in correct section after the entry point.
1445 Asm->OutStreamer.EmitLabel(FunctionEndSym);
1447 // Set DwarfDwarfCompileUnitID in MCContext to default value.
1448 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1450 SmallPtrSet<const MDNode *, 16> ProcessedVars;
1451 collectVariableInfo(ProcessedVars);
1453 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1454 DwarfCompileUnit &TheCU = *SPMap.lookup(FnScope->getScopeNode());
1456 // Add the range of this function to the list of ranges for the CU.
1457 TheCU.addRange(RangeSpan(FunctionBeginSym, FunctionEndSym));
1459 // Under -gmlt, skip building the subprogram if there are no inlined
1460 // subroutines inside it.
1461 if (TheCU.getCUNode().getEmissionKind() == DIBuilder::LineTablesOnly &&
1462 LScopes.getAbstractScopesList().empty() && !IsDarwin) {
1463 assert(ScopeVariables.empty());
1464 assert(CurrentFnArguments.empty());
1465 assert(DbgValues.empty());
1466 // FIXME: This wouldn't be true in LTO with a -g (with inlining) CU followed
1467 // by a -gmlt CU. Add a test and remove this assertion.
1468 assert(AbstractVariables.empty());
1469 LabelsBeforeInsn.clear();
1470 LabelsAfterInsn.clear();
1471 PrevLabel = nullptr;
1476 // Construct abstract scopes.
1477 for (LexicalScope *AScope : LScopes.getAbstractScopesList()) {
1478 DISubprogram SP(AScope->getScopeNode());
1479 assert(SP.isSubprogram());
1480 // Collect info for variables that were optimized out.
1481 DIArray Variables = SP.getVariables();
1482 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1483 DIVariable DV(Variables.getElement(i));
1484 assert(DV && DV.isVariable());
1485 if (!ProcessedVars.insert(DV))
1487 ensureAbstractVariableIsCreated(DV, DV.getContext());
1489 constructAbstractSubprogramScopeDIE(TheCU, AScope);
1492 constructSubprogramScopeDIE(TheCU, FnScope);
1495 // Ownership of DbgVariables is a bit subtle - ScopeVariables owns all the
1496 // DbgVariables except those that are also in AbstractVariables (since they
1497 // can be used cross-function)
1498 ScopeVariables.clear();
1499 CurrentFnArguments.clear();
1501 LabelsBeforeInsn.clear();
1502 LabelsAfterInsn.clear();
1503 PrevLabel = nullptr;
1507 // Register a source line with debug info. Returns the unique label that was
1508 // emitted and which provides correspondence to the source line list.
1509 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
1514 unsigned Discriminator = 0;
1515 if (DIScope Scope = DIScope(S)) {
1516 assert(Scope.isScope());
1517 Fn = Scope.getFilename();
1518 Dir = Scope.getDirectory();
1519 if (Scope.isLexicalBlockFile())
1520 Discriminator = DILexicalBlockFile(S).getDiscriminator();
1522 unsigned CUID = Asm->OutStreamer.getContext().getDwarfCompileUnitID();
1523 Src = static_cast<DwarfCompileUnit &>(*InfoHolder.getUnits()[CUID])
1524 .getOrCreateSourceID(Fn, Dir);
1526 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0,
1530 //===----------------------------------------------------------------------===//
1532 //===----------------------------------------------------------------------===//
1534 // Emit initial Dwarf sections with a label at the start of each one.
1535 void DwarfDebug::emitSectionLabels() {
1536 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1538 // Dwarf sections base addresses.
1539 DwarfInfoSectionSym =
1540 emitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
1541 if (useSplitDwarf()) {
1542 DwarfInfoDWOSectionSym =
1543 emitSectionSym(Asm, TLOF.getDwarfInfoDWOSection(), "section_info_dwo");
1544 DwarfTypesDWOSectionSym =
1545 emitSectionSym(Asm, TLOF.getDwarfTypesDWOSection(), "section_types_dwo");
1547 DwarfAbbrevSectionSym =
1548 emitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
1549 if (useSplitDwarf())
1550 DwarfAbbrevDWOSectionSym = emitSectionSym(
1551 Asm, TLOF.getDwarfAbbrevDWOSection(), "section_abbrev_dwo");
1552 if (GenerateARangeSection)
1553 emitSectionSym(Asm, TLOF.getDwarfARangesSection());
1555 DwarfLineSectionSym =
1556 emitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
1557 if (GenerateGnuPubSections) {
1558 DwarfGnuPubNamesSectionSym =
1559 emitSectionSym(Asm, TLOF.getDwarfGnuPubNamesSection());
1560 DwarfGnuPubTypesSectionSym =
1561 emitSectionSym(Asm, TLOF.getDwarfGnuPubTypesSection());
1562 } else if (HasDwarfPubSections) {
1563 emitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
1564 emitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
1567 DwarfStrSectionSym =
1568 emitSectionSym(Asm, TLOF.getDwarfStrSection(), "info_string");
1569 if (useSplitDwarf()) {
1570 DwarfStrDWOSectionSym =
1571 emitSectionSym(Asm, TLOF.getDwarfStrDWOSection(), "skel_string");
1572 DwarfAddrSectionSym =
1573 emitSectionSym(Asm, TLOF.getDwarfAddrSection(), "addr_sec");
1574 DwarfDebugLocSectionSym =
1575 emitSectionSym(Asm, TLOF.getDwarfLocDWOSection(), "skel_loc");
1577 DwarfDebugLocSectionSym =
1578 emitSectionSym(Asm, TLOF.getDwarfLocSection(), "section_debug_loc");
1579 DwarfDebugRangeSectionSym =
1580 emitSectionSym(Asm, TLOF.getDwarfRangesSection(), "debug_range");
1583 // Recursively emits a debug information entry.
1584 void DwarfDebug::emitDIE(DIE &Die) {
1585 // Get the abbreviation for this DIE.
1586 const DIEAbbrev &Abbrev = Die.getAbbrev();
1588 // Emit the code (index) for the abbreviation.
1589 if (Asm->isVerbose())
1590 Asm->OutStreamer.AddComment("Abbrev [" + Twine(Abbrev.getNumber()) +
1591 "] 0x" + Twine::utohexstr(Die.getOffset()) +
1592 ":0x" + Twine::utohexstr(Die.getSize()) + " " +
1593 dwarf::TagString(Abbrev.getTag()));
1594 Asm->EmitULEB128(Abbrev.getNumber());
1596 const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
1597 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
1599 // Emit the DIE attribute values.
1600 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
1601 dwarf::Attribute Attr = AbbrevData[i].getAttribute();
1602 dwarf::Form Form = AbbrevData[i].getForm();
1603 assert(Form && "Too many attributes for DIE (check abbreviation)");
1605 if (Asm->isVerbose()) {
1606 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
1607 if (Attr == dwarf::DW_AT_accessibility)
1608 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(
1609 cast<DIEInteger>(Values[i])->getValue()));
1612 // Emit an attribute using the defined form.
1613 Values[i]->EmitValue(Asm, Form);
1616 // Emit the DIE children if any.
1617 if (Abbrev.hasChildren()) {
1618 for (auto &Child : Die.getChildren())
1621 Asm->OutStreamer.AddComment("End Of Children Mark");
1626 // Emit the debug info section.
1627 void DwarfDebug::emitDebugInfo() {
1628 DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
1630 Holder.emitUnits(this, DwarfAbbrevSectionSym);
1633 // Emit the abbreviation section.
1634 void DwarfDebug::emitAbbreviations() {
1635 DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
1637 Holder.emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection());
1640 // Emit the last address of the section and the end of the line matrix.
1641 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
1642 // Define last address of section.
1643 Asm->OutStreamer.AddComment("Extended Op");
1646 Asm->OutStreamer.AddComment("Op size");
1647 Asm->EmitInt8(Asm->getDataLayout().getPointerSize() + 1);
1648 Asm->OutStreamer.AddComment("DW_LNE_set_address");
1649 Asm->EmitInt8(dwarf::DW_LNE_set_address);
1651 Asm->OutStreamer.AddComment("Section end label");
1653 Asm->OutStreamer.EmitSymbolValue(
1654 Asm->GetTempSymbol("section_end", SectionEnd),
1655 Asm->getDataLayout().getPointerSize());
1657 // Mark end of matrix.
1658 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
1664 void DwarfDebug::emitAccel(DwarfAccelTable &Accel, const MCSection *Section,
1665 StringRef TableName, StringRef SymName) {
1666 Accel.FinalizeTable(Asm, TableName);
1667 Asm->OutStreamer.SwitchSection(Section);
1668 auto *SectionBegin = Asm->GetTempSymbol(SymName);
1669 Asm->OutStreamer.EmitLabel(SectionBegin);
1671 // Emit the full data.
1672 Accel.Emit(Asm, SectionBegin, &InfoHolder, DwarfStrSectionSym);
1675 // Emit visible names into a hashed accelerator table section.
1676 void DwarfDebug::emitAccelNames() {
1677 emitAccel(AccelNames, Asm->getObjFileLowering().getDwarfAccelNamesSection(),
1678 "Names", "names_begin");
1681 // Emit objective C classes and categories into a hashed accelerator table
1683 void DwarfDebug::emitAccelObjC() {
1684 emitAccel(AccelObjC, Asm->getObjFileLowering().getDwarfAccelObjCSection(),
1685 "ObjC", "objc_begin");
1688 // Emit namespace dies into a hashed accelerator table.
1689 void DwarfDebug::emitAccelNamespaces() {
1690 emitAccel(AccelNamespace,
1691 Asm->getObjFileLowering().getDwarfAccelNamespaceSection(),
1692 "namespac", "namespac_begin");
1695 // Emit type dies into a hashed accelerator table.
1696 void DwarfDebug::emitAccelTypes() {
1697 emitAccel(AccelTypes, Asm->getObjFileLowering().getDwarfAccelTypesSection(),
1698 "types", "types_begin");
1701 // Public name handling.
1702 // The format for the various pubnames:
1704 // dwarf pubnames - offset/name pairs where the offset is the offset into the CU
1705 // for the DIE that is named.
1707 // gnu pubnames - offset/index value/name tuples where the offset is the offset
1708 // into the CU and the index value is computed according to the type of value
1709 // for the DIE that is named.
1711 // For type units the offset is the offset of the skeleton DIE. For split dwarf
1712 // it's the offset within the debug_info/debug_types dwo section, however, the
1713 // reference in the pubname header doesn't change.
1715 /// computeIndexValue - Compute the gdb index value for the DIE and CU.
1716 static dwarf::PubIndexEntryDescriptor computeIndexValue(DwarfUnit *CU,
1718 dwarf::GDBIndexEntryLinkage Linkage = dwarf::GIEL_STATIC;
1720 // We could have a specification DIE that has our most of our knowledge,
1721 // look for that now.
1722 DIEValue *SpecVal = Die->findAttribute(dwarf::DW_AT_specification);
1724 DIE &SpecDIE = cast<DIEEntry>(SpecVal)->getEntry();
1725 if (SpecDIE.findAttribute(dwarf::DW_AT_external))
1726 Linkage = dwarf::GIEL_EXTERNAL;
1727 } else if (Die->findAttribute(dwarf::DW_AT_external))
1728 Linkage = dwarf::GIEL_EXTERNAL;
1730 switch (Die->getTag()) {
1731 case dwarf::DW_TAG_class_type:
1732 case dwarf::DW_TAG_structure_type:
1733 case dwarf::DW_TAG_union_type:
1734 case dwarf::DW_TAG_enumeration_type:
1735 return dwarf::PubIndexEntryDescriptor(
1736 dwarf::GIEK_TYPE, CU->getLanguage() != dwarf::DW_LANG_C_plus_plus
1737 ? dwarf::GIEL_STATIC
1738 : dwarf::GIEL_EXTERNAL);
1739 case dwarf::DW_TAG_typedef:
1740 case dwarf::DW_TAG_base_type:
1741 case dwarf::DW_TAG_subrange_type:
1742 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_TYPE, dwarf::GIEL_STATIC);
1743 case dwarf::DW_TAG_namespace:
1744 return dwarf::GIEK_TYPE;
1745 case dwarf::DW_TAG_subprogram:
1746 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_FUNCTION, Linkage);
1747 case dwarf::DW_TAG_constant:
1748 case dwarf::DW_TAG_variable:
1749 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE, Linkage);
1750 case dwarf::DW_TAG_enumerator:
1751 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE,
1752 dwarf::GIEL_STATIC);
1754 return dwarf::GIEK_NONE;
1758 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
1760 void DwarfDebug::emitDebugPubNames(bool GnuStyle) {
1761 const MCSection *PSec =
1762 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubNamesSection()
1763 : Asm->getObjFileLowering().getDwarfPubNamesSection();
1765 emitDebugPubSection(GnuStyle, PSec, "Names", &DwarfUnit::getGlobalNames);
1768 void DwarfDebug::emitDebugPubSection(
1769 bool GnuStyle, const MCSection *PSec, StringRef Name,
1770 const StringMap<const DIE *> &(DwarfUnit::*Accessor)() const) {
1771 for (const auto &NU : CUMap) {
1772 DwarfCompileUnit *TheU = NU.second;
1774 const auto &Globals = (TheU->*Accessor)();
1776 if (Globals.empty())
1779 if (auto Skeleton = static_cast<DwarfCompileUnit *>(TheU->getSkeleton()))
1781 unsigned ID = TheU->getUniqueID();
1783 // Start the dwarf pubnames section.
1784 Asm->OutStreamer.SwitchSection(PSec);
1787 Asm->OutStreamer.AddComment("Length of Public " + Name + " Info");
1788 MCSymbol *BeginLabel = Asm->GetTempSymbol("pub" + Name + "_begin", ID);
1789 MCSymbol *EndLabel = Asm->GetTempSymbol("pub" + Name + "_end", ID);
1790 Asm->EmitLabelDifference(EndLabel, BeginLabel, 4);
1792 Asm->OutStreamer.EmitLabel(BeginLabel);
1794 Asm->OutStreamer.AddComment("DWARF Version");
1795 Asm->EmitInt16(dwarf::DW_PUBNAMES_VERSION);
1797 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
1798 Asm->EmitSectionOffset(TheU->getLabelBegin(), TheU->getSectionSym());
1800 Asm->OutStreamer.AddComment("Compilation Unit Length");
1801 Asm->EmitLabelDifference(TheU->getLabelEnd(), TheU->getLabelBegin(), 4);
1803 // Emit the pubnames for this compilation unit.
1804 for (const auto &GI : Globals) {
1805 const char *Name = GI.getKeyData();
1806 const DIE *Entity = GI.second;
1808 Asm->OutStreamer.AddComment("DIE offset");
1809 Asm->EmitInt32(Entity->getOffset());
1812 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheU, Entity);
1813 Asm->OutStreamer.AddComment(
1814 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
1815 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
1816 Asm->EmitInt8(Desc.toBits());
1819 Asm->OutStreamer.AddComment("External Name");
1820 Asm->OutStreamer.EmitBytes(StringRef(Name, GI.getKeyLength() + 1));
1823 Asm->OutStreamer.AddComment("End Mark");
1825 Asm->OutStreamer.EmitLabel(EndLabel);
1829 void DwarfDebug::emitDebugPubTypes(bool GnuStyle) {
1830 const MCSection *PSec =
1831 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubTypesSection()
1832 : Asm->getObjFileLowering().getDwarfPubTypesSection();
1834 emitDebugPubSection(GnuStyle, PSec, "Types", &DwarfUnit::getGlobalTypes);
1837 // Emit visible names into a debug str section.
1838 void DwarfDebug::emitDebugStr() {
1839 DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
1840 Holder.emitStrings(Asm->getObjFileLowering().getDwarfStrSection());
1843 /// Emits an optimal (=sorted) sequence of DW_OP_pieces.
1844 void DwarfDebug::emitLocPieces(ByteStreamer &Streamer,
1845 const DITypeIdentifierMap &Map,
1846 ArrayRef<DebugLocEntry::Value> Values) {
1847 assert(std::all_of(Values.begin(), Values.end(), [](DebugLocEntry::Value P) {
1848 return P.isVariablePiece();
1849 }) && "all values are expected to be pieces");
1850 assert(std::is_sorted(Values.begin(), Values.end()) &&
1851 "pieces are expected to be sorted");
1853 unsigned Offset = 0;
1854 for (auto Piece : Values) {
1855 DIExpression Expr = Piece.getExpression();
1856 unsigned PieceOffset = Expr.getPieceOffset();
1857 unsigned PieceSize = Expr.getPieceSize();
1858 assert(Offset <= PieceOffset && "overlapping or duplicate pieces");
1859 if (Offset < PieceOffset) {
1860 // The DWARF spec seriously mandates pieces with no locations for gaps.
1861 Asm->EmitDwarfOpPiece(Streamer, (PieceOffset-Offset)*8);
1862 Offset += PieceOffset-Offset;
1865 Offset += PieceSize;
1867 const unsigned SizeOfByte = 8;
1869 DIVariable Var = Piece.getVariable();
1870 assert(!Var.isIndirect() && "indirect address for piece");
1871 unsigned VarSize = Var.getSizeInBits(Map);
1872 assert(PieceSize+PieceOffset <= VarSize/SizeOfByte
1873 && "piece is larger than or outside of variable");
1874 assert(PieceSize*SizeOfByte != VarSize
1875 && "piece covers entire variable");
1877 if (Piece.isLocation() && Piece.getLoc().isReg())
1878 Asm->EmitDwarfRegOpPiece(Streamer,
1880 PieceSize*SizeOfByte);
1882 emitDebugLocValue(Streamer, Piece);
1883 Asm->EmitDwarfOpPiece(Streamer, PieceSize*SizeOfByte);
1889 void DwarfDebug::emitDebugLocEntry(ByteStreamer &Streamer,
1890 const DebugLocEntry &Entry) {
1891 const DebugLocEntry::Value Value = Entry.getValues()[0];
1892 if (Value.isVariablePiece())
1893 // Emit all pieces that belong to the same variable and range.
1894 return emitLocPieces(Streamer, TypeIdentifierMap, Entry.getValues());
1896 assert(Entry.getValues().size() == 1 && "only pieces may have >1 value");
1897 emitDebugLocValue(Streamer, Value);
1900 void DwarfDebug::emitDebugLocValue(ByteStreamer &Streamer,
1901 const DebugLocEntry::Value &Value) {
1902 DIVariable DV = Value.getVariable();
1904 if (Value.isInt()) {
1905 DIBasicType BTy(resolve(DV.getType()));
1906 if (BTy.Verify() && (BTy.getEncoding() == dwarf::DW_ATE_signed ||
1907 BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
1908 Streamer.EmitInt8(dwarf::DW_OP_consts, "DW_OP_consts");
1909 Streamer.EmitSLEB128(Value.getInt());
1911 Streamer.EmitInt8(dwarf::DW_OP_constu, "DW_OP_constu");
1912 Streamer.EmitULEB128(Value.getInt());
1914 } else if (Value.isLocation()) {
1915 MachineLocation Loc = Value.getLoc();
1916 DIExpression Expr = Value.getExpression();
1919 Asm->EmitDwarfRegOp(Streamer, Loc, DV.isIndirect());
1921 // Complex address entry.
1922 unsigned N = Expr.getNumElements();
1924 if (N >= 2 && Expr.getElement(0) == dwarf::DW_OP_plus) {
1925 if (Loc.getOffset()) {
1927 Asm->EmitDwarfRegOp(Streamer, Loc, DV.isIndirect());
1928 Streamer.EmitInt8(dwarf::DW_OP_deref, "DW_OP_deref");
1929 Streamer.EmitInt8(dwarf::DW_OP_plus_uconst, "DW_OP_plus_uconst");
1930 Streamer.EmitSLEB128(Expr.getElement(1));
1932 // If first address element is OpPlus then emit
1933 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
1934 MachineLocation TLoc(Loc.getReg(), Expr.getElement(1));
1935 Asm->EmitDwarfRegOp(Streamer, TLoc, DV.isIndirect());
1939 Asm->EmitDwarfRegOp(Streamer, Loc, DV.isIndirect());
1942 // Emit remaining complex address elements.
1943 for (; i < N; ++i) {
1944 uint64_t Element = Expr.getElement(i);
1945 if (Element == dwarf::DW_OP_plus) {
1946 Streamer.EmitInt8(dwarf::DW_OP_plus_uconst, "DW_OP_plus_uconst");
1947 Streamer.EmitULEB128(Expr.getElement(++i));
1948 } else if (Element == dwarf::DW_OP_deref) {
1950 Streamer.EmitInt8(dwarf::DW_OP_deref, "DW_OP_deref");
1951 } else if (Element == dwarf::DW_OP_piece) {
1953 // handled in emitDebugLocEntry.
1955 llvm_unreachable("unknown Opcode found in complex address");
1959 // else ... ignore constant fp. There is not any good way to
1960 // to represent them here in dwarf.
1964 void DwarfDebug::emitDebugLocEntryLocation(const DebugLocEntry &Entry) {
1965 Asm->OutStreamer.AddComment("Loc expr size");
1966 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
1967 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
1968 Asm->EmitLabelDifference(end, begin, 2);
1969 Asm->OutStreamer.EmitLabel(begin);
1971 APByteStreamer Streamer(*Asm);
1972 emitDebugLocEntry(Streamer, Entry);
1974 Asm->OutStreamer.EmitLabel(end);
1977 // Emit locations into the debug loc section.
1978 void DwarfDebug::emitDebugLoc() {
1979 // Start the dwarf loc section.
1980 Asm->OutStreamer.SwitchSection(
1981 Asm->getObjFileLowering().getDwarfLocSection());
1982 unsigned char Size = Asm->getDataLayout().getPointerSize();
1983 for (const auto &DebugLoc : DotDebugLocEntries) {
1984 Asm->OutStreamer.EmitLabel(DebugLoc.Label);
1985 const DwarfCompileUnit *CU = DebugLoc.CU;
1986 assert(!CU->getRanges().empty());
1987 for (const auto &Entry : DebugLoc.List) {
1988 // Set up the range. This range is relative to the entry point of the
1989 // compile unit. This is a hard coded 0 for low_pc when we're emitting
1990 // ranges, or the DW_AT_low_pc on the compile unit otherwise.
1991 if (CU->getRanges().size() == 1) {
1992 // Grab the begin symbol from the first range as our base.
1993 const MCSymbol *Base = CU->getRanges()[0].getStart();
1994 Asm->EmitLabelDifference(Entry.getBeginSym(), Base, Size);
1995 Asm->EmitLabelDifference(Entry.getEndSym(), Base, Size);
1997 Asm->OutStreamer.EmitSymbolValue(Entry.getBeginSym(), Size);
1998 Asm->OutStreamer.EmitSymbolValue(Entry.getEndSym(), Size);
2001 emitDebugLocEntryLocation(Entry);
2003 Asm->OutStreamer.EmitIntValue(0, Size);
2004 Asm->OutStreamer.EmitIntValue(0, Size);
2008 void DwarfDebug::emitDebugLocDWO() {
2009 Asm->OutStreamer.SwitchSection(
2010 Asm->getObjFileLowering().getDwarfLocDWOSection());
2011 for (const auto &DebugLoc : DotDebugLocEntries) {
2012 Asm->OutStreamer.EmitLabel(DebugLoc.Label);
2013 for (const auto &Entry : DebugLoc.List) {
2014 // Just always use start_length for now - at least that's one address
2015 // rather than two. We could get fancier and try to, say, reuse an
2016 // address we know we've emitted elsewhere (the start of the function?
2017 // The start of the CU or CU subrange that encloses this range?)
2018 Asm->EmitInt8(dwarf::DW_LLE_start_length_entry);
2019 unsigned idx = AddrPool.getIndex(Entry.getBeginSym());
2020 Asm->EmitULEB128(idx);
2021 Asm->EmitLabelDifference(Entry.getEndSym(), Entry.getBeginSym(), 4);
2023 emitDebugLocEntryLocation(Entry);
2025 Asm->EmitInt8(dwarf::DW_LLE_end_of_list_entry);
2030 const MCSymbol *Start, *End;
2033 // Emit a debug aranges section, containing a CU lookup for any
2034 // address we can tie back to a CU.
2035 void DwarfDebug::emitDebugARanges() {
2036 // Start the dwarf aranges section.
2037 Asm->OutStreamer.SwitchSection(
2038 Asm->getObjFileLowering().getDwarfARangesSection());
2040 typedef DenseMap<DwarfCompileUnit *, std::vector<ArangeSpan>> SpansType;
2044 // Build a list of sections used.
2045 std::vector<const MCSection *> Sections;
2046 for (const auto &it : SectionMap) {
2047 const MCSection *Section = it.first;
2048 Sections.push_back(Section);
2051 // Sort the sections into order.
2052 // This is only done to ensure consistent output order across different runs.
2053 std::sort(Sections.begin(), Sections.end(), SectionSort);
2055 // Build a set of address spans, sorted by CU.
2056 for (const MCSection *Section : Sections) {
2057 SmallVector<SymbolCU, 8> &List = SectionMap[Section];
2058 if (List.size() < 2)
2061 // Sort the symbols by offset within the section.
2062 std::sort(List.begin(), List.end(),
2063 [&](const SymbolCU &A, const SymbolCU &B) {
2064 unsigned IA = A.Sym ? Asm->OutStreamer.GetSymbolOrder(A.Sym) : 0;
2065 unsigned IB = B.Sym ? Asm->OutStreamer.GetSymbolOrder(B.Sym) : 0;
2067 // Symbols with no order assigned should be placed at the end.
2068 // (e.g. section end labels)
2076 // If we have no section (e.g. common), just write out
2077 // individual spans for each symbol.
2079 for (const SymbolCU &Cur : List) {
2081 Span.Start = Cur.Sym;
2084 Spans[Cur.CU].push_back(Span);
2087 // Build spans between each label.
2088 const MCSymbol *StartSym = List[0].Sym;
2089 for (size_t n = 1, e = List.size(); n < e; n++) {
2090 const SymbolCU &Prev = List[n - 1];
2091 const SymbolCU &Cur = List[n];
2093 // Try and build the longest span we can within the same CU.
2094 if (Cur.CU != Prev.CU) {
2096 Span.Start = StartSym;
2098 Spans[Prev.CU].push_back(Span);
2105 unsigned PtrSize = Asm->getDataLayout().getPointerSize();
2107 // Build a list of CUs used.
2108 std::vector<DwarfCompileUnit *> CUs;
2109 for (const auto &it : Spans) {
2110 DwarfCompileUnit *CU = it.first;
2114 // Sort the CU list (again, to ensure consistent output order).
2115 std::sort(CUs.begin(), CUs.end(), [](const DwarfUnit *A, const DwarfUnit *B) {
2116 return A->getUniqueID() < B->getUniqueID();
2119 // Emit an arange table for each CU we used.
2120 for (DwarfCompileUnit *CU : CUs) {
2121 std::vector<ArangeSpan> &List = Spans[CU];
2123 // Emit size of content not including length itself.
2124 unsigned ContentSize =
2125 sizeof(int16_t) + // DWARF ARange version number
2126 sizeof(int32_t) + // Offset of CU in the .debug_info section
2127 sizeof(int8_t) + // Pointer Size (in bytes)
2128 sizeof(int8_t); // Segment Size (in bytes)
2130 unsigned TupleSize = PtrSize * 2;
2132 // 7.20 in the Dwarf specs requires the table to be aligned to a tuple.
2134 OffsetToAlignment(sizeof(int32_t) + ContentSize, TupleSize);
2136 ContentSize += Padding;
2137 ContentSize += (List.size() + 1) * TupleSize;
2139 // For each compile unit, write the list of spans it covers.
2140 Asm->OutStreamer.AddComment("Length of ARange Set");
2141 Asm->EmitInt32(ContentSize);
2142 Asm->OutStreamer.AddComment("DWARF Arange version number");
2143 Asm->EmitInt16(dwarf::DW_ARANGES_VERSION);
2144 Asm->OutStreamer.AddComment("Offset Into Debug Info Section");
2145 Asm->EmitSectionOffset(CU->getLocalLabelBegin(), CU->getLocalSectionSym());
2146 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2147 Asm->EmitInt8(PtrSize);
2148 Asm->OutStreamer.AddComment("Segment Size (in bytes)");
2151 Asm->OutStreamer.EmitFill(Padding, 0xff);
2153 for (const ArangeSpan &Span : List) {
2154 Asm->EmitLabelReference(Span.Start, PtrSize);
2156 // Calculate the size as being from the span start to it's end.
2158 Asm->EmitLabelDifference(Span.End, Span.Start, PtrSize);
2160 // For symbols without an end marker (e.g. common), we
2161 // write a single arange entry containing just that one symbol.
2162 uint64_t Size = SymSize[Span.Start];
2166 Asm->OutStreamer.EmitIntValue(Size, PtrSize);
2170 Asm->OutStreamer.AddComment("ARange terminator");
2171 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2172 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2176 // Emit visible names into a debug ranges section.
2177 void DwarfDebug::emitDebugRanges() {
2178 // Start the dwarf ranges section.
2179 Asm->OutStreamer.SwitchSection(
2180 Asm->getObjFileLowering().getDwarfRangesSection());
2182 // Size for our labels.
2183 unsigned char Size = Asm->getDataLayout().getPointerSize();
2185 // Grab the specific ranges for the compile units in the module.
2186 for (const auto &I : CUMap) {
2187 DwarfCompileUnit *TheCU = I.second;
2189 // Iterate over the misc ranges for the compile units in the module.
2190 for (const RangeSpanList &List : TheCU->getRangeLists()) {
2191 // Emit our symbol so we can find the beginning of the range.
2192 Asm->OutStreamer.EmitLabel(List.getSym());
2194 for (const RangeSpan &Range : List.getRanges()) {
2195 const MCSymbol *Begin = Range.getStart();
2196 const MCSymbol *End = Range.getEnd();
2197 assert(Begin && "Range without a begin symbol?");
2198 assert(End && "Range without an end symbol?");
2199 if (TheCU->getRanges().size() == 1) {
2200 // Grab the begin symbol from the first range as our base.
2201 const MCSymbol *Base = TheCU->getRanges()[0].getStart();
2202 Asm->EmitLabelDifference(Begin, Base, Size);
2203 Asm->EmitLabelDifference(End, Base, Size);
2205 Asm->OutStreamer.EmitSymbolValue(Begin, Size);
2206 Asm->OutStreamer.EmitSymbolValue(End, Size);
2210 // And terminate the list with two 0 values.
2211 Asm->OutStreamer.EmitIntValue(0, Size);
2212 Asm->OutStreamer.EmitIntValue(0, Size);
2215 // Now emit a range for the CU itself.
2216 if (TheCU->getRanges().size() > 1) {
2217 Asm->OutStreamer.EmitLabel(
2218 Asm->GetTempSymbol("cu_ranges", TheCU->getUniqueID()));
2219 for (const RangeSpan &Range : TheCU->getRanges()) {
2220 const MCSymbol *Begin = Range.getStart();
2221 const MCSymbol *End = Range.getEnd();
2222 assert(Begin && "Range without a begin symbol?");
2223 assert(End && "Range without an end symbol?");
2224 Asm->OutStreamer.EmitSymbolValue(Begin, Size);
2225 Asm->OutStreamer.EmitSymbolValue(End, Size);
2227 // And terminate the list with two 0 values.
2228 Asm->OutStreamer.EmitIntValue(0, Size);
2229 Asm->OutStreamer.EmitIntValue(0, Size);
2234 // DWARF5 Experimental Separate Dwarf emitters.
2236 void DwarfDebug::initSkeletonUnit(const DwarfUnit &U, DIE &Die,
2237 std::unique_ptr<DwarfUnit> NewU) {
2238 NewU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name,
2239 U.getCUNode().getSplitDebugFilename());
2241 if (!CompilationDir.empty())
2242 NewU->addLocalString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
2244 addGnuPubAttributes(*NewU, Die);
2246 SkeletonHolder.addUnit(std::move(NewU));
2249 // This DIE has the following attributes: DW_AT_comp_dir, DW_AT_stmt_list,
2250 // DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges, DW_AT_dwo_name, DW_AT_dwo_id,
2251 // DW_AT_addr_base, DW_AT_ranges_base.
2252 DwarfCompileUnit &DwarfDebug::constructSkeletonCU(const DwarfCompileUnit &CU) {
2254 auto OwnedUnit = make_unique<DwarfCompileUnit>(
2255 CU.getUniqueID(), CU.getCUNode(), Asm, this, &SkeletonHolder);
2256 DwarfCompileUnit &NewCU = *OwnedUnit;
2257 NewCU.initSection(Asm->getObjFileLowering().getDwarfInfoSection(),
2258 DwarfInfoSectionSym);
2260 NewCU.initStmtList(DwarfLineSectionSym);
2262 initSkeletonUnit(CU, NewCU.getUnitDie(), std::move(OwnedUnit));
2267 // Emit the .debug_info.dwo section for separated dwarf. This contains the
2268 // compile units that would normally be in debug_info.
2269 void DwarfDebug::emitDebugInfoDWO() {
2270 assert(useSplitDwarf() && "No split dwarf debug info?");
2271 // Don't pass an abbrev symbol, using a constant zero instead so as not to
2272 // emit relocations into the dwo file.
2273 InfoHolder.emitUnits(this, /* AbbrevSymbol */ nullptr);
2276 // Emit the .debug_abbrev.dwo section for separated dwarf. This contains the
2277 // abbreviations for the .debug_info.dwo section.
2278 void DwarfDebug::emitDebugAbbrevDWO() {
2279 assert(useSplitDwarf() && "No split dwarf?");
2280 InfoHolder.emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevDWOSection());
2283 void DwarfDebug::emitDebugLineDWO() {
2284 assert(useSplitDwarf() && "No split dwarf?");
2285 Asm->OutStreamer.SwitchSection(
2286 Asm->getObjFileLowering().getDwarfLineDWOSection());
2287 SplitTypeUnitFileTable.Emit(Asm->OutStreamer);
2290 // Emit the .debug_str.dwo section for separated dwarf. This contains the
2291 // string section and is identical in format to traditional .debug_str
2293 void DwarfDebug::emitDebugStrDWO() {
2294 assert(useSplitDwarf() && "No split dwarf?");
2295 const MCSection *OffSec =
2296 Asm->getObjFileLowering().getDwarfStrOffDWOSection();
2297 InfoHolder.emitStrings(Asm->getObjFileLowering().getDwarfStrDWOSection(),
2301 MCDwarfDwoLineTable *DwarfDebug::getDwoLineTable(const DwarfCompileUnit &CU) {
2302 if (!useSplitDwarf())
2305 SplitTypeUnitFileTable.setCompilationDir(CU.getCUNode().getDirectory());
2306 return &SplitTypeUnitFileTable;
2309 static uint64_t makeTypeSignature(StringRef Identifier) {
2311 Hash.update(Identifier);
2312 // ... take the least significant 8 bytes and return those. Our MD5
2313 // implementation always returns its results in little endian, swap bytes
2315 MD5::MD5Result Result;
2317 return *reinterpret_cast<support::ulittle64_t *>(Result + 8);
2320 void DwarfDebug::addDwarfTypeUnitType(DwarfCompileUnit &CU,
2321 StringRef Identifier, DIE &RefDie,
2322 DICompositeType CTy) {
2323 // Fast path if we're building some type units and one has already used the
2324 // address pool we know we're going to throw away all this work anyway, so
2325 // don't bother building dependent types.
2326 if (!TypeUnitsUnderConstruction.empty() && AddrPool.hasBeenUsed())
2329 const DwarfTypeUnit *&TU = DwarfTypeUnits[CTy];
2331 CU.addDIETypeSignature(RefDie, *TU);
2335 bool TopLevelType = TypeUnitsUnderConstruction.empty();
2336 AddrPool.resetUsedFlag();
2338 auto OwnedUnit = make_unique<DwarfTypeUnit>(
2339 InfoHolder.getUnits().size() + TypeUnitsUnderConstruction.size(), CU, Asm,
2340 this, &InfoHolder, getDwoLineTable(CU));
2341 DwarfTypeUnit &NewTU = *OwnedUnit;
2342 DIE &UnitDie = NewTU.getUnitDie();
2344 TypeUnitsUnderConstruction.push_back(
2345 std::make_pair(std::move(OwnedUnit), CTy));
2347 NewTU.addUInt(UnitDie, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
2350 uint64_t Signature = makeTypeSignature(Identifier);
2351 NewTU.setTypeSignature(Signature);
2353 if (useSplitDwarf())
2354 NewTU.initSection(Asm->getObjFileLowering().getDwarfTypesDWOSection(),
2355 DwarfTypesDWOSectionSym);
2357 CU.applyStmtList(UnitDie);
2359 Asm->getObjFileLowering().getDwarfTypesSection(Signature));
2362 NewTU.setType(NewTU.createTypeDIE(CTy));
2365 auto TypeUnitsToAdd = std::move(TypeUnitsUnderConstruction);
2366 TypeUnitsUnderConstruction.clear();
2368 // Types referencing entries in the address table cannot be placed in type
2370 if (AddrPool.hasBeenUsed()) {
2372 // Remove all the types built while building this type.
2373 // This is pessimistic as some of these types might not be dependent on
2374 // the type that used an address.
2375 for (const auto &TU : TypeUnitsToAdd)
2376 DwarfTypeUnits.erase(TU.second);
2378 // Construct this type in the CU directly.
2379 // This is inefficient because all the dependent types will be rebuilt
2380 // from scratch, including building them in type units, discovering that
2381 // they depend on addresses, throwing them out and rebuilding them.
2382 CU.constructTypeDIE(RefDie, CTy);
2386 // If the type wasn't dependent on fission addresses, finish adding the type
2387 // and all its dependent types.
2388 for (auto &TU : TypeUnitsToAdd)
2389 InfoHolder.addUnit(std::move(TU.first));
2391 CU.addDIETypeSignature(RefDie, NewTU);
2394 // Accelerator table mutators - add each name along with its companion
2395 // DIE to the proper table while ensuring that the name that we're going
2396 // to reference is in the string table. We do this since the names we
2397 // add may not only be identical to the names in the DIE.
2398 void DwarfDebug::addAccelName(StringRef Name, const DIE &Die) {
2399 if (!useDwarfAccelTables())
2401 AccelNames.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
2405 void DwarfDebug::addAccelObjC(StringRef Name, const DIE &Die) {
2406 if (!useDwarfAccelTables())
2408 AccelObjC.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
2412 void DwarfDebug::addAccelNamespace(StringRef Name, const DIE &Die) {
2413 if (!useDwarfAccelTables())
2415 AccelNamespace.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
2419 void DwarfDebug::addAccelType(StringRef Name, const DIE &Die, char Flags) {
2420 if (!useDwarfAccelTables())
2422 AccelTypes.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),