2 //===-- llvm/CodeGen/DwarfDebug.cpp - Dwarf Debug Framework ---------------===//
4 // The LLVM Compiler Infrastructure
6 // This file is distributed under the University of Illinois Open Source
7 // License. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 // This file contains support for writing dwarf debug info into asm files.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "dwarfdebug"
16 #include "DwarfDebug.h"
18 #include "DwarfAccelTable.h"
19 #include "DwarfCompileUnit.h"
20 #include "llvm/ADT/STLExtras.h"
21 #include "llvm/ADT/Statistic.h"
22 #include "llvm/ADT/StringExtras.h"
23 #include "llvm/ADT/Triple.h"
24 #include "llvm/CodeGen/MachineFunction.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/Constants.h"
27 #include "llvm/DIBuilder.h"
28 #include "llvm/DataLayout.h"
29 #include "llvm/DebugInfo.h"
30 #include "llvm/Instructions.h"
31 #include "llvm/MC/MCAsmInfo.h"
32 #include "llvm/MC/MCSection.h"
33 #include "llvm/MC/MCStreamer.h"
34 #include "llvm/MC/MCSymbol.h"
35 #include "llvm/Module.h"
36 #include "llvm/Support/CommandLine.h"
37 #include "llvm/Support/Debug.h"
38 #include "llvm/Support/ErrorHandling.h"
39 #include "llvm/Support/FormattedStream.h"
40 #include "llvm/Support/Path.h"
41 #include "llvm/Support/Timer.h"
42 #include "llvm/Support/ValueHandle.h"
43 #include "llvm/Target/TargetFrameLowering.h"
44 #include "llvm/Target/TargetLoweringObjectFile.h"
45 #include "llvm/Target/TargetMachine.h"
46 #include "llvm/Target/TargetOptions.h"
47 #include "llvm/Target/TargetRegisterInfo.h"
50 static cl::opt<bool> DisableDebugInfoPrinting("disable-debug-info-print",
52 cl::desc("Disable debug info printing"));
54 static cl::opt<bool> UnknownLocations("use-unknown-locations", cl::Hidden,
55 cl::desc("Make an absence of debug location information explicit."),
60 Default, Enable, Disable
64 static cl::opt<DefaultOnOff> DwarfAccelTables("dwarf-accel-tables", cl::Hidden,
65 cl::desc("Output prototype dwarf accelerator tables."),
67 clEnumVal(Default, "Default for platform"),
68 clEnumVal(Enable, "Enabled"),
69 clEnumVal(Disable, "Disabled"),
73 static cl::opt<DefaultOnOff> DarwinGDBCompat("darwin-gdb-compat", cl::Hidden,
74 cl::desc("Compatibility with Darwin gdb."),
76 clEnumVal(Default, "Default for platform"),
77 clEnumVal(Enable, "Enabled"),
78 clEnumVal(Disable, "Disabled"),
82 static cl::opt<DefaultOnOff> SplitDwarf("split-dwarf", cl::Hidden,
83 cl::desc("Output prototype dwarf split debug info."),
85 clEnumVal(Default, "Default for platform"),
86 clEnumVal(Enable, "Enabled"),
87 clEnumVal(Disable, "Disabled"),
92 const char *DWARFGroupName = "DWARF Emission";
93 const char *DbgTimerName = "DWARF Debug Writer";
94 } // end anonymous namespace
96 //===----------------------------------------------------------------------===//
98 // Configuration values for initial hash set sizes (log2).
100 static const unsigned InitAbbreviationsSetSize = 9; // log2(512)
104 DIType DbgVariable::getType() const {
105 DIType Ty = Var.getType();
106 // FIXME: isBlockByrefVariable should be reformulated in terms of complex
107 // addresses instead.
108 if (Var.isBlockByrefVariable()) {
109 /* Byref variables, in Blocks, are declared by the programmer as
110 "SomeType VarName;", but the compiler creates a
111 __Block_byref_x_VarName struct, and gives the variable VarName
112 either the struct, or a pointer to the struct, as its type. This
113 is necessary for various behind-the-scenes things the compiler
114 needs to do with by-reference variables in blocks.
116 However, as far as the original *programmer* is concerned, the
117 variable should still have type 'SomeType', as originally declared.
119 The following function dives into the __Block_byref_x_VarName
120 struct to find the original type of the variable. This will be
121 passed back to the code generating the type for the Debug
122 Information Entry for the variable 'VarName'. 'VarName' will then
123 have the original type 'SomeType' in its debug information.
125 The original type 'SomeType' will be the type of the field named
126 'VarName' inside the __Block_byref_x_VarName struct.
128 NOTE: In order for this to not completely fail on the debugger
129 side, the Debug Information Entry for the variable VarName needs to
130 have a DW_AT_location that tells the debugger how to unwind through
131 the pointers and __Block_byref_x_VarName struct to find the actual
132 value of the variable. The function addBlockByrefType does this. */
134 unsigned tag = Ty.getTag();
136 if (tag == dwarf::DW_TAG_pointer_type) {
137 DIDerivedType DTy = DIDerivedType(Ty);
138 subType = DTy.getTypeDerivedFrom();
141 DICompositeType blockStruct = DICompositeType(subType);
142 DIArray Elements = blockStruct.getTypeArray();
144 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
145 DIDescriptor Element = Elements.getElement(i);
146 DIDerivedType DT = DIDerivedType(Element);
147 if (getName() == DT.getName())
148 return (DT.getTypeDerivedFrom());
154 } // end llvm namespace
156 DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
157 : Asm(A), MMI(Asm->MMI), FirstCU(0),
158 AbbreviationsSet(InitAbbreviationsSetSize),
159 SourceIdMap(DIEValueAllocator), StringPool(DIEValueAllocator),
160 PrevLabel(NULL), GlobalCUIndexCount(0), SkeletonCU(0) {
161 NextStringPoolNumber = 0;
163 DwarfInfoSectionSym = DwarfAbbrevSectionSym = 0;
164 DwarfStrSectionSym = TextSectionSym = 0;
165 DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = 0;
166 FunctionBeginSym = FunctionEndSym = 0;
168 // Turn on accelerator tables and older gdb compatibility
170 bool IsDarwin = Triple(M->getTargetTriple()).isOSDarwin();
171 if (DarwinGDBCompat == Default) {
173 IsDarwinGDBCompat = true;
175 IsDarwinGDBCompat = false;
177 IsDarwinGDBCompat = DarwinGDBCompat == Enable ? true : false;
179 if (DwarfAccelTables == Default) {
181 HasDwarfAccelTables = true;
183 HasDwarfAccelTables = false;
185 HasDwarfAccelTables = DwarfAccelTables == Enable ? true : false;
187 if (SplitDwarf == Default)
188 HasSplitDwarf = false;
190 HasSplitDwarf = SplitDwarf == Enable ? true : false;
193 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
197 DwarfDebug::~DwarfDebug() {
200 // Switch to the specified MCSection and emit an assembler
201 // temporary label to it if SymbolStem is specified.
202 static MCSymbol *emitSectionSym(AsmPrinter *Asm, const MCSection *Section,
203 const char *SymbolStem = 0) {
204 Asm->OutStreamer.SwitchSection(Section);
205 if (!SymbolStem) return 0;
207 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
208 Asm->OutStreamer.EmitLabel(TmpSym);
212 MCSymbol *DwarfDebug::getStringPool() {
213 return Asm->GetTempSymbol("section_str");
216 MCSymbol *DwarfDebug::getStringPoolEntry(StringRef Str) {
217 std::pair<MCSymbol*, unsigned> &Entry = StringPool[Str];
218 if (Entry.first) return Entry.first;
220 Entry.second = NextStringPoolNumber++;
221 return Entry.first = Asm->GetTempSymbol("string", Entry.second);
224 // Define a unique number for the abbreviation.
226 void DwarfDebug::assignAbbrevNumber(DIEAbbrev &Abbrev) {
227 // Profile the node so that we can make it unique.
231 // Check the set for priors.
232 DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
234 // If it's newly added.
235 if (InSet == &Abbrev) {
236 // Add to abbreviation list.
237 Abbreviations.push_back(&Abbrev);
239 // Assign the vector position + 1 as its number.
240 Abbrev.setNumber(Abbreviations.size());
242 // Assign existing abbreviation number.
243 Abbrev.setNumber(InSet->getNumber());
247 // If special LLVM prefix that is used to inform the asm
248 // printer to not emit usual symbol prefix before the symbol name is used then
249 // return linkage name after skipping this special LLVM prefix.
250 static StringRef getRealLinkageName(StringRef LinkageName) {
252 if (LinkageName.startswith(StringRef(&One, 1)))
253 return LinkageName.substr(1);
257 static bool isObjCClass(StringRef Name) {
258 return Name.startswith("+") || Name.startswith("-");
261 static bool hasObjCCategory(StringRef Name) {
262 if (!isObjCClass(Name)) return false;
264 size_t pos = Name.find(')');
265 if (pos != std::string::npos) {
266 if (Name[pos+1] != ' ') return false;
272 static void getObjCClassCategory(StringRef In, StringRef &Class,
273 StringRef &Category) {
274 if (!hasObjCCategory(In)) {
275 Class = In.slice(In.find('[') + 1, In.find(' '));
280 Class = In.slice(In.find('[') + 1, In.find('('));
281 Category = In.slice(In.find('[') + 1, In.find(' '));
285 static StringRef getObjCMethodName(StringRef In) {
286 return In.slice(In.find(' ') + 1, In.find(']'));
289 // Add the various names to the Dwarf accelerator table names.
290 static void addSubprogramNames(CompileUnit *TheCU, DISubprogram SP,
292 if (!SP.isDefinition()) return;
294 TheCU->addAccelName(SP.getName(), Die);
296 // If the linkage name is different than the name, go ahead and output
297 // that as well into the name table.
298 if (SP.getLinkageName() != "" && SP.getName() != SP.getLinkageName())
299 TheCU->addAccelName(SP.getLinkageName(), Die);
301 // If this is an Objective-C selector name add it to the ObjC accelerator
303 if (isObjCClass(SP.getName())) {
304 StringRef Class, Category;
305 getObjCClassCategory(SP.getName(), Class, Category);
306 TheCU->addAccelObjC(Class, Die);
308 TheCU->addAccelObjC(Category, Die);
309 // Also add the base method name to the name table.
310 TheCU->addAccelName(getObjCMethodName(SP.getName()), Die);
314 // Find DIE for the given subprogram and attach appropriate DW_AT_low_pc
315 // and DW_AT_high_pc attributes. If there are global variables in this
316 // scope then create and insert DIEs for these variables.
317 DIE *DwarfDebug::updateSubprogramScopeDIE(CompileUnit *SPCU,
318 const MDNode *SPNode) {
319 DIE *SPDie = SPCU->getDIE(SPNode);
321 assert(SPDie && "Unable to find subprogram DIE!");
322 DISubprogram SP(SPNode);
324 // If we're updating an abstract DIE, then we will be adding the children and
325 // object pointer later on. But what we don't want to do is process the
326 // concrete DIE twice.
327 if (DIE *AbsSPDIE = AbstractSPDies.lookup(SPNode)) {
328 // Pick up abstract subprogram DIE.
329 SPDie = new DIE(dwarf::DW_TAG_subprogram);
330 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_abstract_origin,
331 dwarf::DW_FORM_ref4, AbsSPDIE);
334 DISubprogram SPDecl = SP.getFunctionDeclaration();
335 if (!SPDecl.isSubprogram()) {
336 // There is not any need to generate specification DIE for a function
337 // defined at compile unit level. If a function is defined inside another
338 // function then gdb prefers the definition at top level and but does not
339 // expect specification DIE in parent function. So avoid creating
340 // specification DIE for a function defined inside a function.
341 if (SP.isDefinition() && !SP.getContext().isCompileUnit() &&
342 !SP.getContext().isFile() &&
343 !isSubprogramContext(SP.getContext())) {
344 SPCU->addFlag(SPDie, dwarf::DW_AT_declaration);
347 DICompositeType SPTy = SP.getType();
348 DIArray Args = SPTy.getTypeArray();
349 unsigned SPTag = SPTy.getTag();
350 if (SPTag == dwarf::DW_TAG_subroutine_type)
351 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
352 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
353 DIType ATy = DIType(Args.getElement(i));
354 SPCU->addType(Arg, ATy);
355 if (ATy.isArtificial())
356 SPCU->addFlag(Arg, dwarf::DW_AT_artificial);
357 if (ATy.isObjectPointer())
358 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_object_pointer,
359 dwarf::DW_FORM_ref4, Arg);
360 SPDie->addChild(Arg);
362 DIE *SPDeclDie = SPDie;
363 SPDie = new DIE(dwarf::DW_TAG_subprogram);
364 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification,
365 dwarf::DW_FORM_ref4, SPDeclDie);
371 SPCU->addLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
372 Asm->GetTempSymbol("func_begin", Asm->getFunctionNumber()));
373 SPCU->addLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
374 Asm->GetTempSymbol("func_end", Asm->getFunctionNumber()));
375 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
376 MachineLocation Location(RI->getFrameRegister(*Asm->MF));
377 SPCU->addAddress(SPDie, dwarf::DW_AT_frame_base, Location);
379 // Add name to the name table, we do this here because we're guaranteed
380 // to have concrete versions of our DW_TAG_subprogram nodes.
381 addSubprogramNames(SPCU, SP, SPDie);
386 // Construct new DW_TAG_lexical_block for this scope and attach
387 // DW_AT_low_pc/DW_AT_high_pc labels.
388 DIE *DwarfDebug::constructLexicalScopeDIE(CompileUnit *TheCU,
389 LexicalScope *Scope) {
390 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_lexical_block);
391 if (Scope->isAbstractScope())
394 const SmallVector<InsnRange, 4> &Ranges = Scope->getRanges();
398 SmallVector<InsnRange, 4>::const_iterator RI = Ranges.begin();
399 if (Ranges.size() > 1) {
400 // .debug_range section has not been laid out yet. Emit offset in
401 // .debug_range as a uint, size 4, for now. emitDIE will handle
402 // DW_AT_ranges appropriately.
403 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_ranges, dwarf::DW_FORM_data4,
404 DebugRangeSymbols.size()
405 * Asm->getDataLayout().getPointerSize());
406 for (SmallVector<InsnRange, 4>::const_iterator RI = Ranges.begin(),
407 RE = Ranges.end(); RI != RE; ++RI) {
408 DebugRangeSymbols.push_back(getLabelBeforeInsn(RI->first));
409 DebugRangeSymbols.push_back(getLabelAfterInsn(RI->second));
411 DebugRangeSymbols.push_back(NULL);
412 DebugRangeSymbols.push_back(NULL);
416 const MCSymbol *Start = getLabelBeforeInsn(RI->first);
417 const MCSymbol *End = getLabelAfterInsn(RI->second);
419 if (End == 0) return 0;
421 assert(Start->isDefined() && "Invalid starting label for an inlined scope!");
422 assert(End->isDefined() && "Invalid end label for an inlined scope!");
424 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, Start);
425 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr, End);
430 // This scope represents inlined body of a function. Construct DIE to
431 // represent this concrete inlined copy of the function.
432 DIE *DwarfDebug::constructInlinedScopeDIE(CompileUnit *TheCU,
433 LexicalScope *Scope) {
434 const SmallVector<InsnRange, 4> &Ranges = Scope->getRanges();
435 assert(Ranges.empty() == false &&
436 "LexicalScope does not have instruction markers!");
438 if (!Scope->getScopeNode())
440 DIScope DS(Scope->getScopeNode());
441 DISubprogram InlinedSP = getDISubprogram(DS);
442 DIE *OriginDIE = TheCU->getDIE(InlinedSP);
444 DEBUG(dbgs() << "Unable to find original DIE for an inlined subprogram.");
448 SmallVector<InsnRange, 4>::const_iterator RI = Ranges.begin();
449 const MCSymbol *StartLabel = getLabelBeforeInsn(RI->first);
450 const MCSymbol *EndLabel = getLabelAfterInsn(RI->second);
452 if (StartLabel == 0 || EndLabel == 0) {
453 llvm_unreachable("Unexpected Start and End labels for an inlined scope!");
455 assert(StartLabel->isDefined() &&
456 "Invalid starting label for an inlined scope!");
457 assert(EndLabel->isDefined() &&
458 "Invalid end label for an inlined scope!");
460 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine);
461 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin,
462 dwarf::DW_FORM_ref4, OriginDIE);
464 if (Ranges.size() > 1) {
465 // .debug_range section has not been laid out yet. Emit offset in
466 // .debug_range as a uint, size 4, for now. emitDIE will handle
467 // DW_AT_ranges appropriately.
468 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_ranges, dwarf::DW_FORM_data4,
469 DebugRangeSymbols.size()
470 * Asm->getDataLayout().getPointerSize());
471 for (SmallVector<InsnRange, 4>::const_iterator RI = Ranges.begin(),
472 RE = Ranges.end(); RI != RE; ++RI) {
473 DebugRangeSymbols.push_back(getLabelBeforeInsn(RI->first));
474 DebugRangeSymbols.push_back(getLabelAfterInsn(RI->second));
476 DebugRangeSymbols.push_back(NULL);
477 DebugRangeSymbols.push_back(NULL);
479 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
481 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
485 InlinedSubprogramDIEs.insert(OriginDIE);
487 // Track the start label for this inlined function.
488 //.debug_inlined section specification does not clearly state how
489 // to emit inlined scope that is split into multiple instruction ranges.
490 // For now, use first instruction range and emit low_pc/high_pc pair and
491 // corresponding .debug_inlined section entry for this pair.
492 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator
493 I = InlineInfo.find(InlinedSP);
495 if (I == InlineInfo.end()) {
496 InlineInfo[InlinedSP].push_back(std::make_pair(StartLabel, ScopeDIE));
497 InlinedSPNodes.push_back(InlinedSP);
499 I->second.push_back(std::make_pair(StartLabel, ScopeDIE));
501 DILocation DL(Scope->getInlinedAt());
502 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_file, 0,
503 getOrCreateSourceID(DL.getFilename(), DL.getDirectory()));
504 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_line, 0, DL.getLineNumber());
506 // Add name to the name table, we do this here because we're guaranteed
507 // to have concrete versions of our DW_TAG_inlined_subprogram nodes.
508 addSubprogramNames(TheCU, InlinedSP, ScopeDIE);
513 // Construct a DIE for this scope.
514 DIE *DwarfDebug::constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope) {
515 if (!Scope || !Scope->getScopeNode())
518 SmallVector<DIE *, 8> Children;
519 DIE *ObjectPointer = NULL;
521 // Collect arguments for current function.
522 if (LScopes.isCurrentFunctionScope(Scope))
523 for (unsigned i = 0, N = CurrentFnArguments.size(); i < N; ++i)
524 if (DbgVariable *ArgDV = CurrentFnArguments[i])
526 TheCU->constructVariableDIE(ArgDV, Scope->isAbstractScope())) {
527 Children.push_back(Arg);
528 if (ArgDV->isObjectPointer()) ObjectPointer = Arg;
531 // Collect lexical scope children first.
532 const SmallVector<DbgVariable *, 8> &Variables = ScopeVariables.lookup(Scope);
533 for (unsigned i = 0, N = Variables.size(); i < N; ++i)
535 TheCU->constructVariableDIE(Variables[i], Scope->isAbstractScope())) {
536 Children.push_back(Variable);
537 if (Variables[i]->isObjectPointer()) ObjectPointer = Variable;
539 const SmallVector<LexicalScope *, 4> &Scopes = Scope->getChildren();
540 for (unsigned j = 0, M = Scopes.size(); j < M; ++j)
541 if (DIE *Nested = constructScopeDIE(TheCU, Scopes[j]))
542 Children.push_back(Nested);
543 DIScope DS(Scope->getScopeNode());
544 DIE *ScopeDIE = NULL;
545 if (Scope->getInlinedAt())
546 ScopeDIE = constructInlinedScopeDIE(TheCU, Scope);
547 else if (DS.isSubprogram()) {
548 ProcessedSPNodes.insert(DS);
549 if (Scope->isAbstractScope()) {
550 ScopeDIE = TheCU->getDIE(DS);
551 // Note down abstract DIE.
553 AbstractSPDies.insert(std::make_pair(DS, ScopeDIE));
556 ScopeDIE = updateSubprogramScopeDIE(TheCU, DS);
559 // There is no need to emit empty lexical block DIE.
560 if (Children.empty())
562 ScopeDIE = constructLexicalScopeDIE(TheCU, Scope);
565 if (!ScopeDIE) return NULL;
568 for (SmallVector<DIE *, 8>::iterator I = Children.begin(),
569 E = Children.end(); I != E; ++I)
570 ScopeDIE->addChild(*I);
572 if (DS.isSubprogram() && ObjectPointer != NULL)
573 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer,
574 dwarf::DW_FORM_ref4, ObjectPointer);
576 if (DS.isSubprogram())
577 TheCU->addPubTypes(DISubprogram(DS));
582 // Look up the source id with the given directory and source file names.
583 // If none currently exists, create a new id and insert it in the
584 // SourceIds map. This can update DirectoryNames and SourceFileNames maps
586 unsigned DwarfDebug::getOrCreateSourceID(StringRef FileName,
588 // If FE did not provide a file name, then assume stdin.
589 if (FileName.empty())
590 return getOrCreateSourceID("<stdin>", StringRef());
592 // TODO: this might not belong here. See if we can factor this better.
593 if (DirName == CompilationDir)
596 unsigned SrcId = SourceIdMap.size()+1;
598 // We look up the file/dir pair by concatenating them with a zero byte.
599 SmallString<128> NamePair;
601 NamePair += '\0'; // Zero bytes are not allowed in paths.
602 NamePair += FileName;
604 StringMapEntry<unsigned> &Ent = SourceIdMap.GetOrCreateValue(NamePair, SrcId);
605 if (Ent.getValue() != SrcId)
606 return Ent.getValue();
608 // Print out a .file directive to specify files for .loc directives.
609 Asm->OutStreamer.EmitDwarfFileDirective(SrcId, DirName, FileName);
614 // Create new CompileUnit for the given metadata node with tag DW_TAG_compile_unit.
615 CompileUnit *DwarfDebug::constructCompileUnit(const MDNode *N) {
616 DICompileUnit DIUnit(N);
617 StringRef FN = DIUnit.getFilename();
618 CompilationDir = DIUnit.getDirectory();
619 // Call this to emit a .file directive if it wasn't emitted for the source
620 // file this CU comes from yet.
621 getOrCreateSourceID(FN, CompilationDir);
623 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
624 CompileUnit *NewCU = new CompileUnit(GlobalCUIndexCount++,
625 DIUnit.getLanguage(), Die, Asm, this);
626 NewCU->addString(Die, dwarf::DW_AT_producer, DIUnit.getProducer());
627 NewCU->addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
628 DIUnit.getLanguage());
629 NewCU->addString(Die, dwarf::DW_AT_name, FN);
630 // 2.17.1 requires that we use DW_AT_low_pc for a single entry point
632 NewCU->addUInt(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, 0);
633 // DW_AT_stmt_list is a offset of line number information for this
634 // compile unit in debug_line section.
635 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
636 NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
637 Asm->GetTempSymbol("section_line"));
639 NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0);
641 if (!CompilationDir.empty())
642 NewCU->addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
643 if (DIUnit.isOptimized())
644 NewCU->addFlag(Die, dwarf::DW_AT_APPLE_optimized);
646 StringRef Flags = DIUnit.getFlags();
648 NewCU->addString(Die, dwarf::DW_AT_APPLE_flags, Flags);
650 if (unsigned RVer = DIUnit.getRunTimeVersion())
651 NewCU->addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
652 dwarf::DW_FORM_data1, RVer);
656 if (useSplitDwarf() && !SkeletonCU)
657 SkeletonCU = constructSkeletonCU(N);
659 CUMap.insert(std::make_pair(N, NewCU));
663 // Construct subprogram DIE.
664 void DwarfDebug::constructSubprogramDIE(CompileUnit *TheCU,
666 CompileUnit *&CURef = SPMap[N];
672 if (!SP.isDefinition())
673 // This is a method declaration which will be handled while constructing
677 DIE *SubprogramDie = TheCU->getOrCreateSubprogramDIE(SP);
680 TheCU->insertDIE(N, SubprogramDie);
682 // Add to context owner.
683 TheCU->addToContextOwner(SubprogramDie, SP.getContext());
688 // Collect debug info from named mdnodes such as llvm.dbg.enum and llvm.dbg.ty.
689 void DwarfDebug::collectInfoFromNamedMDNodes(const Module *M) {
690 if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.sp"))
691 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
692 const MDNode *N = NMD->getOperand(i);
693 if (CompileUnit *CU = CUMap.lookup(DISubprogram(N).getCompileUnit()))
694 constructSubprogramDIE(CU, N);
697 if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.gv"))
698 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
699 const MDNode *N = NMD->getOperand(i);
700 if (CompileUnit *CU = CUMap.lookup(DIGlobalVariable(N).getCompileUnit()))
701 CU->createGlobalVariableDIE(N);
704 if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.enum"))
705 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
706 DIType Ty(NMD->getOperand(i));
707 if (CompileUnit *CU = CUMap.lookup(Ty.getCompileUnit()))
708 CU->getOrCreateTypeDIE(Ty);
711 if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.ty"))
712 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
713 DIType Ty(NMD->getOperand(i));
714 if (CompileUnit *CU = CUMap.lookup(Ty.getCompileUnit()))
715 CU->getOrCreateTypeDIE(Ty);
719 // Collect debug info using DebugInfoFinder.
720 // FIXME - Remove this when dragonegg switches to DIBuilder.
721 bool DwarfDebug::collectLegacyDebugInfo(const Module *M) {
722 DebugInfoFinder DbgFinder;
723 DbgFinder.processModule(*M);
725 bool HasDebugInfo = false;
726 // Scan all the compile-units to see if there are any marked as the main
727 // unit. If not, we do not generate debug info.
728 for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
729 E = DbgFinder.compile_unit_end(); I != E; ++I) {
730 if (DICompileUnit(*I).isMain()) {
735 if (!HasDebugInfo) return false;
737 // Create all the compile unit DIEs.
738 for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
739 E = DbgFinder.compile_unit_end(); I != E; ++I)
740 constructCompileUnit(*I);
742 // Create DIEs for each global variable.
743 for (DebugInfoFinder::iterator I = DbgFinder.global_variable_begin(),
744 E = DbgFinder.global_variable_end(); I != E; ++I) {
745 const MDNode *N = *I;
746 if (CompileUnit *CU = CUMap.lookup(DIGlobalVariable(N).getCompileUnit()))
747 CU->createGlobalVariableDIE(N);
750 // Create DIEs for each subprogram.
751 for (DebugInfoFinder::iterator I = DbgFinder.subprogram_begin(),
752 E = DbgFinder.subprogram_end(); I != E; ++I) {
753 const MDNode *N = *I;
754 if (CompileUnit *CU = CUMap.lookup(DISubprogram(N).getCompileUnit()))
755 constructSubprogramDIE(CU, N);
761 // Emit all Dwarf sections that should come prior to the content. Create
762 // global DIEs and emit initial debug info sections. This is invoked by
763 // the target AsmPrinter.
764 void DwarfDebug::beginModule() {
765 if (DisableDebugInfoPrinting)
768 const Module *M = MMI->getModule();
770 // If module has named metadata anchors then use them, otherwise scan the
771 // module using debug info finder to collect debug info.
772 NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
774 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
775 DICompileUnit CUNode(CU_Nodes->getOperand(i));
776 CompileUnit *CU = constructCompileUnit(CUNode);
777 DIArray GVs = CUNode.getGlobalVariables();
778 for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i)
779 CU->createGlobalVariableDIE(GVs.getElement(i));
780 DIArray SPs = CUNode.getSubprograms();
781 for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
782 constructSubprogramDIE(CU, SPs.getElement(i));
783 DIArray EnumTypes = CUNode.getEnumTypes();
784 for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i)
785 CU->getOrCreateTypeDIE(EnumTypes.getElement(i));
786 DIArray RetainedTypes = CUNode.getRetainedTypes();
787 for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i)
788 CU->getOrCreateTypeDIE(RetainedTypes.getElement(i));
790 } else if (!collectLegacyDebugInfo(M))
793 collectInfoFromNamedMDNodes(M);
795 // Tell MMI that we have debug info.
796 MMI->setDebugInfoAvailability(true);
798 // Prime section data.
799 SectionMap.insert(Asm->getObjFileLowering().getTextSection());
802 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
803 void DwarfDebug::computeInlinedDIEs() {
804 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
805 for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(),
806 AE = InlinedSubprogramDIEs.end(); AI != AE; ++AI) {
808 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, 0, dwarf::DW_INL_inlined);
810 for (DenseMap<const MDNode *, DIE *>::iterator AI = AbstractSPDies.begin(),
811 AE = AbstractSPDies.end(); AI != AE; ++AI) {
812 DIE *ISP = AI->second;
813 if (InlinedSubprogramDIEs.count(ISP))
815 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, 0, dwarf::DW_INL_inlined);
819 // Collect info for variables that were optimized out.
820 void DwarfDebug::collectDeadVariables() {
821 const Module *M = MMI->getModule();
822 DenseMap<const MDNode *, LexicalScope *> DeadFnScopeMap;
824 if (NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu")) {
825 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
826 DICompileUnit TheCU(CU_Nodes->getOperand(i));
827 DIArray Subprograms = TheCU.getSubprograms();
828 for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
829 DISubprogram SP(Subprograms.getElement(i));
830 if (ProcessedSPNodes.count(SP) != 0) continue;
831 if (!SP.Verify()) continue;
832 if (!SP.isDefinition()) continue;
833 DIArray Variables = SP.getVariables();
834 if (Variables.getNumElements() == 0) continue;
836 LexicalScope *Scope =
837 new LexicalScope(NULL, DIDescriptor(SP), NULL, false);
838 DeadFnScopeMap[SP] = Scope;
840 // Construct subprogram DIE and add variables DIEs.
841 CompileUnit *SPCU = CUMap.lookup(TheCU);
842 assert(SPCU && "Unable to find Compile Unit!");
843 constructSubprogramDIE(SPCU, SP);
844 DIE *ScopeDIE = SPCU->getDIE(SP);
845 for (unsigned vi = 0, ve = Variables.getNumElements(); vi != ve; ++vi) {
846 DIVariable DV(Variables.getElement(vi));
847 if (!DV.Verify()) continue;
848 DbgVariable *NewVar = new DbgVariable(DV, NULL);
849 if (DIE *VariableDIE =
850 SPCU->constructVariableDIE(NewVar, Scope->isAbstractScope()))
851 ScopeDIE->addChild(VariableDIE);
856 DeleteContainerSeconds(DeadFnScopeMap);
859 void DwarfDebug::finalizeModuleInfo() {
860 // Collect info for variables that were optimized out.
861 collectDeadVariables();
863 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
864 computeInlinedDIEs();
866 // Emit DW_AT_containing_type attribute to connect types with their
867 // vtable holding type.
868 for (DenseMap<const MDNode *, CompileUnit *>::iterator CUI = CUMap.begin(),
869 CUE = CUMap.end(); CUI != CUE; ++CUI) {
870 CompileUnit *TheCU = CUI->second;
871 TheCU->constructContainingTypeDIEs();
874 // Compute DIE offsets and sizes.
875 computeSizeAndOffsets();
878 void DwarfDebug::endSections() {
879 // Standard sections final addresses.
880 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getTextSection());
881 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("text_end"));
882 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getDataSection());
883 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("data_end"));
885 // End text sections.
886 for (unsigned I = 0, E = SectionMap.size(); I != E; ++I) {
887 Asm->OutStreamer.SwitchSection(SectionMap[I]);
888 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_end", I+1));
892 // Emit all Dwarf sections that should come after the content.
893 void DwarfDebug::endModule() {
895 if (!FirstCU) return;
897 // End any existing sections.
898 // TODO: Does this need to happen?
901 // Finalize the debug info for the module.
902 finalizeModuleInfo();
904 // Emit initial sections.
907 if (!useSplitDwarf()) {
908 // Emit all the DIEs into a debug info section.
911 // Corresponding abbreviations into a abbrev section.
914 // Emit info into a debug loc section.
917 // Emit info into a debug aranges section.
920 // Emit info into a debug ranges section.
923 // Emit info into a debug macinfo section.
927 // TODO: When we don't need the option anymore we
928 // can remove all of the code that this section
930 if (useDarwinGDBCompat())
931 emitDebugInlineInfo();
933 // TODO: Fill this in for Fission sections and separate
934 // out information into new sections.
936 // Emit the debug info section and compile units.
940 // Corresponding abbreviations into a abbrev section.
943 // Emit info into a debug loc section.
946 // Emit info into a debug aranges section.
949 // Emit info into a debug ranges section.
952 // Emit info into a debug macinfo section.
956 // TODO: When we don't need the option anymore we
957 // can remove all of the code that this section
959 if (useDarwinGDBCompat())
960 emitDebugInlineInfo();
963 // Emit info into the dwarf accelerator table sections.
964 if (useDwarfAccelTables()) {
967 emitAccelNamespaces();
971 // Emit info into a debug pubtypes section.
972 // TODO: When we don't need the option anymore we can
973 // remove all of the code that adds to the table.
974 if (useDarwinGDBCompat())
977 // Finally emit string information into a string table.
982 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
983 E = CUMap.end(); I != E; ++I)
988 // Reset these for the next Module if we have one.
993 // Find abstract variable, if any, associated with Var.
994 DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &DV,
996 LLVMContext &Ctx = DV->getContext();
997 // More then one inlined variable corresponds to one abstract variable.
998 DIVariable Var = cleanseInlinedVariable(DV, Ctx);
999 DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var);
1001 return AbsDbgVariable;
1003 LexicalScope *Scope = LScopes.findAbstractScope(ScopeLoc.getScope(Ctx));
1007 AbsDbgVariable = new DbgVariable(Var, NULL);
1008 addScopeVariable(Scope, AbsDbgVariable);
1009 AbstractVariables[Var] = AbsDbgVariable;
1010 return AbsDbgVariable;
1013 // If Var is a current function argument then add it to CurrentFnArguments list.
1014 bool DwarfDebug::addCurrentFnArgument(const MachineFunction *MF,
1015 DbgVariable *Var, LexicalScope *Scope) {
1016 if (!LScopes.isCurrentFunctionScope(Scope))
1018 DIVariable DV = Var->getVariable();
1019 if (DV.getTag() != dwarf::DW_TAG_arg_variable)
1021 unsigned ArgNo = DV.getArgNumber();
1025 size_t Size = CurrentFnArguments.size();
1027 CurrentFnArguments.resize(MF->getFunction()->arg_size());
1028 // llvm::Function argument size is not good indicator of how many
1029 // arguments does the function have at source level.
1031 CurrentFnArguments.resize(ArgNo * 2);
1032 CurrentFnArguments[ArgNo - 1] = Var;
1036 // Collect variable information from side table maintained by MMI.
1038 DwarfDebug::collectVariableInfoFromMMITable(const MachineFunction *MF,
1039 SmallPtrSet<const MDNode *, 16> &Processed) {
1040 MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
1041 for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
1042 VE = VMap.end(); VI != VE; ++VI) {
1043 const MDNode *Var = VI->first;
1045 Processed.insert(Var);
1047 const std::pair<unsigned, DebugLoc> &VP = VI->second;
1049 LexicalScope *Scope = LScopes.findLexicalScope(VP.second);
1051 // If variable scope is not found then skip this variable.
1055 DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
1056 DbgVariable *RegVar = new DbgVariable(DV, AbsDbgVariable);
1057 RegVar->setFrameIndex(VP.first);
1058 if (!addCurrentFnArgument(MF, RegVar, Scope))
1059 addScopeVariable(Scope, RegVar);
1061 AbsDbgVariable->setFrameIndex(VP.first);
1065 // Return true if debug value, encoded by DBG_VALUE instruction, is in a
1067 static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
1068 assert(MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
1069 return MI->getNumOperands() == 3 &&
1070 MI->getOperand(0).isReg() && MI->getOperand(0).getReg() &&
1071 MI->getOperand(1).isImm() && MI->getOperand(1).getImm() == 0;
1074 // Get .debug_loc entry for the instruction range starting at MI.
1075 static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
1076 const MCSymbol *FLabel,
1077 const MCSymbol *SLabel,
1078 const MachineInstr *MI) {
1079 const MDNode *Var = MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1081 if (MI->getNumOperands() != 3) {
1082 MachineLocation MLoc = Asm->getDebugValueLocation(MI);
1083 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1085 if (MI->getOperand(0).isReg() && MI->getOperand(1).isImm()) {
1086 MachineLocation MLoc;
1087 MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
1088 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1090 if (MI->getOperand(0).isImm())
1091 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getImm());
1092 if (MI->getOperand(0).isFPImm())
1093 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getFPImm());
1094 if (MI->getOperand(0).isCImm())
1095 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getCImm());
1097 llvm_unreachable("Unexpected 3 operand DBG_VALUE instruction!");
1100 // Find variables for each lexical scope.
1102 DwarfDebug::collectVariableInfo(const MachineFunction *MF,
1103 SmallPtrSet<const MDNode *, 16> &Processed) {
1105 // collection info from MMI table.
1106 collectVariableInfoFromMMITable(MF, Processed);
1108 for (SmallVectorImpl<const MDNode*>::const_iterator
1109 UVI = UserVariables.begin(), UVE = UserVariables.end(); UVI != UVE;
1111 const MDNode *Var = *UVI;
1112 if (Processed.count(Var))
1115 // History contains relevant DBG_VALUE instructions for Var and instructions
1117 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1118 if (History.empty())
1120 const MachineInstr *MInsn = History.front();
1123 LexicalScope *Scope = NULL;
1124 if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
1125 DISubprogram(DV.getContext()).describes(MF->getFunction()))
1126 Scope = LScopes.getCurrentFunctionScope();
1128 if (DV.getVersion() <= LLVMDebugVersion9)
1129 Scope = LScopes.findLexicalScope(MInsn->getDebugLoc());
1131 if (MDNode *IA = DV.getInlinedAt())
1132 Scope = LScopes.findInlinedScope(DebugLoc::getFromDILocation(IA));
1134 Scope = LScopes.findLexicalScope(cast<MDNode>(DV->getOperand(1)));
1137 // If variable scope is not found then skip this variable.
1141 Processed.insert(DV);
1142 assert(MInsn->isDebugValue() && "History must begin with debug value");
1143 DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc());
1144 DbgVariable *RegVar = new DbgVariable(DV, AbsVar);
1145 if (!addCurrentFnArgument(MF, RegVar, Scope))
1146 addScopeVariable(Scope, RegVar);
1148 AbsVar->setMInsn(MInsn);
1150 // Simplify ranges that are fully coalesced.
1151 if (History.size() <= 1 || (History.size() == 2 &&
1152 MInsn->isIdenticalTo(History.back()))) {
1153 RegVar->setMInsn(MInsn);
1157 // handle multiple DBG_VALUE instructions describing one variable.
1158 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1160 for (SmallVectorImpl<const MachineInstr*>::const_iterator
1161 HI = History.begin(), HE = History.end(); HI != HE; ++HI) {
1162 const MachineInstr *Begin = *HI;
1163 assert(Begin->isDebugValue() && "Invalid History entry");
1165 // Check if DBG_VALUE is truncating a range.
1166 if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg()
1167 && !Begin->getOperand(0).getReg())
1170 // Compute the range for a register location.
1171 const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
1172 const MCSymbol *SLabel = 0;
1175 // If Begin is the last instruction in History then its value is valid
1176 // until the end of the function.
1177 SLabel = FunctionEndSym;
1179 const MachineInstr *End = HI[1];
1180 DEBUG(dbgs() << "DotDebugLoc Pair:\n"
1181 << "\t" << *Begin << "\t" << *End << "\n");
1182 if (End->isDebugValue())
1183 SLabel = getLabelBeforeInsn(End);
1185 // End is a normal instruction clobbering the range.
1186 SLabel = getLabelAfterInsn(End);
1187 assert(SLabel && "Forgot label after clobber instruction");
1192 // The value is valid until the next DBG_VALUE or clobber.
1193 DotDebugLocEntries.push_back(getDebugLocEntry(Asm, FLabel, SLabel,
1196 DotDebugLocEntries.push_back(DotDebugLocEntry());
1199 // Collect info for variables that were optimized out.
1200 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1201 DIArray Variables = DISubprogram(FnScope->getScopeNode()).getVariables();
1202 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1203 DIVariable DV(Variables.getElement(i));
1204 if (!DV || !DV.Verify() || !Processed.insert(DV))
1206 if (LexicalScope *Scope = LScopes.findLexicalScope(DV.getContext()))
1207 addScopeVariable(Scope, new DbgVariable(DV, NULL));
1211 // Return Label preceding the instruction.
1212 const MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1213 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1214 assert(Label && "Didn't insert label before instruction");
1218 // Return Label immediately following the instruction.
1219 const MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1220 return LabelsAfterInsn.lookup(MI);
1223 // Process beginning of an instruction.
1224 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1225 // Check if source location changes, but ignore DBG_VALUE locations.
1226 if (!MI->isDebugValue()) {
1227 DebugLoc DL = MI->getDebugLoc();
1228 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1231 if (DL == PrologEndLoc) {
1232 Flags |= DWARF2_FLAG_PROLOGUE_END;
1233 PrologEndLoc = DebugLoc();
1235 if (PrologEndLoc.isUnknown())
1236 Flags |= DWARF2_FLAG_IS_STMT;
1238 if (!DL.isUnknown()) {
1239 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1240 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1242 recordSourceLine(0, 0, 0, 0);
1246 // Insert labels where requested.
1247 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1248 LabelsBeforeInsn.find(MI);
1251 if (I == LabelsBeforeInsn.end())
1254 // Label already assigned.
1259 PrevLabel = MMI->getContext().CreateTempSymbol();
1260 Asm->OutStreamer.EmitLabel(PrevLabel);
1262 I->second = PrevLabel;
1265 // Process end of an instruction.
1266 void DwarfDebug::endInstruction(const MachineInstr *MI) {
1267 // Don't create a new label after DBG_VALUE instructions.
1268 // They don't generate code.
1269 if (!MI->isDebugValue())
1272 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1273 LabelsAfterInsn.find(MI);
1276 if (I == LabelsAfterInsn.end())
1279 // Label already assigned.
1283 // We need a label after this instruction.
1285 PrevLabel = MMI->getContext().CreateTempSymbol();
1286 Asm->OutStreamer.EmitLabel(PrevLabel);
1288 I->second = PrevLabel;
1291 // Each LexicalScope has first instruction and last instruction to mark
1292 // beginning and end of a scope respectively. Create an inverse map that list
1293 // scopes starts (and ends) with an instruction. One instruction may start (or
1294 // end) multiple scopes. Ignore scopes that are not reachable.
1295 void DwarfDebug::identifyScopeMarkers() {
1296 SmallVector<LexicalScope *, 4> WorkList;
1297 WorkList.push_back(LScopes.getCurrentFunctionScope());
1298 while (!WorkList.empty()) {
1299 LexicalScope *S = WorkList.pop_back_val();
1301 const SmallVector<LexicalScope *, 4> &Children = S->getChildren();
1302 if (!Children.empty())
1303 for (SmallVector<LexicalScope *, 4>::const_iterator SI = Children.begin(),
1304 SE = Children.end(); SI != SE; ++SI)
1305 WorkList.push_back(*SI);
1307 if (S->isAbstractScope())
1310 const SmallVector<InsnRange, 4> &Ranges = S->getRanges();
1313 for (SmallVector<InsnRange, 4>::const_iterator RI = Ranges.begin(),
1314 RE = Ranges.end(); RI != RE; ++RI) {
1315 assert(RI->first && "InsnRange does not have first instruction!");
1316 assert(RI->second && "InsnRange does not have second instruction!");
1317 requestLabelBeforeInsn(RI->first);
1318 requestLabelAfterInsn(RI->second);
1323 // Get MDNode for DebugLoc's scope.
1324 static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
1325 if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
1326 return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
1327 return DL.getScope(Ctx);
1330 // Walk up the scope chain of given debug loc and find line number info
1331 // for the function.
1332 static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
1333 const MDNode *Scope = getScopeNode(DL, Ctx);
1334 DISubprogram SP = getDISubprogram(Scope);
1336 // Check for number of operands since the compatibility is
1338 if (SP->getNumOperands() > 19)
1339 return DebugLoc::get(SP.getScopeLineNumber(), 0, SP);
1341 return DebugLoc::get(SP.getLineNumber(), 0, SP);
1347 // Gather pre-function debug information. Assumes being called immediately
1348 // after the function entry point has been emitted.
1349 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1350 if (!MMI->hasDebugInfo()) return;
1351 LScopes.initialize(*MF);
1352 if (LScopes.empty()) return;
1353 identifyScopeMarkers();
1355 FunctionBeginSym = Asm->GetTempSymbol("func_begin",
1356 Asm->getFunctionNumber());
1357 // Assumes in correct section after the entry point.
1358 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1360 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
1362 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1363 // LiveUserVar - Map physreg numbers to the MDNode they contain.
1364 std::vector<const MDNode*> LiveUserVar(TRI->getNumRegs());
1366 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1368 bool AtBlockEntry = true;
1369 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1371 const MachineInstr *MI = II;
1373 if (MI->isDebugValue()) {
1374 assert(MI->getNumOperands() > 1 && "Invalid machine instruction!");
1376 // Keep track of user variables.
1378 MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1380 // Variable is in a register, we need to check for clobbers.
1381 if (isDbgValueInDefinedReg(MI))
1382 LiveUserVar[MI->getOperand(0).getReg()] = Var;
1384 // Check the history of this variable.
1385 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1386 if (History.empty()) {
1387 UserVariables.push_back(Var);
1388 // The first mention of a function argument gets the FunctionBeginSym
1389 // label, so arguments are visible when breaking at function entry.
1391 if (DV.Verify() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
1392 DISubprogram(getDISubprogram(DV.getContext()))
1393 .describes(MF->getFunction()))
1394 LabelsBeforeInsn[MI] = FunctionBeginSym;
1396 // We have seen this variable before. Try to coalesce DBG_VALUEs.
1397 const MachineInstr *Prev = History.back();
1398 if (Prev->isDebugValue()) {
1399 // Coalesce identical entries at the end of History.
1400 if (History.size() >= 2 &&
1401 Prev->isIdenticalTo(History[History.size() - 2])) {
1402 DEBUG(dbgs() << "Coalescing identical DBG_VALUE entries:\n"
1404 << "\t" << *History[History.size() - 2] << "\n");
1408 // Terminate old register assignments that don't reach MI;
1409 MachineFunction::const_iterator PrevMBB = Prev->getParent();
1410 if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
1411 isDbgValueInDefinedReg(Prev)) {
1412 // Previous register assignment needs to terminate at the end of
1414 MachineBasicBlock::const_iterator LastMI =
1415 PrevMBB->getLastNonDebugInstr();
1416 if (LastMI == PrevMBB->end()) {
1417 // Drop DBG_VALUE for empty range.
1418 DEBUG(dbgs() << "Dropping DBG_VALUE for empty range:\n"
1419 << "\t" << *Prev << "\n");
1423 // Terminate after LastMI.
1424 History.push_back(LastMI);
1429 History.push_back(MI);
1431 // Not a DBG_VALUE instruction.
1433 AtBlockEntry = false;
1435 // First known non-DBG_VALUE and non-frame setup location marks
1436 // the beginning of the function body.
1437 if (!MI->getFlag(MachineInstr::FrameSetup) &&
1438 (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown()))
1439 PrologEndLoc = MI->getDebugLoc();
1441 // Check if the instruction clobbers any registers with debug vars.
1442 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
1443 MOE = MI->operands_end(); MOI != MOE; ++MOI) {
1444 if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
1446 for (MCRegAliasIterator AI(MOI->getReg(), TRI, true);
1447 AI.isValid(); ++AI) {
1449 const MDNode *Var = LiveUserVar[Reg];
1452 // Reg is now clobbered.
1453 LiveUserVar[Reg] = 0;
1455 // Was MD last defined by a DBG_VALUE referring to Reg?
1456 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
1457 if (HistI == DbgValues.end())
1459 SmallVectorImpl<const MachineInstr*> &History = HistI->second;
1460 if (History.empty())
1462 const MachineInstr *Prev = History.back();
1463 // Sanity-check: Register assignments are terminated at the end of
1465 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
1467 // Is the variable still in Reg?
1468 if (!isDbgValueInDefinedReg(Prev) ||
1469 Prev->getOperand(0).getReg() != Reg)
1471 // Var is clobbered. Make sure the next instruction gets a label.
1472 History.push_back(MI);
1479 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
1481 SmallVectorImpl<const MachineInstr*> &History = I->second;
1482 if (History.empty())
1485 // Make sure the final register assignments are terminated.
1486 const MachineInstr *Prev = History.back();
1487 if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
1488 const MachineBasicBlock *PrevMBB = Prev->getParent();
1489 MachineBasicBlock::const_iterator LastMI =
1490 PrevMBB->getLastNonDebugInstr();
1491 if (LastMI == PrevMBB->end())
1492 // Drop DBG_VALUE for empty range.
1495 // Terminate after LastMI.
1496 History.push_back(LastMI);
1499 // Request labels for the full history.
1500 for (unsigned i = 0, e = History.size(); i != e; ++i) {
1501 const MachineInstr *MI = History[i];
1502 if (MI->isDebugValue())
1503 requestLabelBeforeInsn(MI);
1505 requestLabelAfterInsn(MI);
1509 PrevInstLoc = DebugLoc();
1510 PrevLabel = FunctionBeginSym;
1512 // Record beginning of function.
1513 if (!PrologEndLoc.isUnknown()) {
1514 DebugLoc FnStartDL = getFnDebugLoc(PrologEndLoc,
1515 MF->getFunction()->getContext());
1516 recordSourceLine(FnStartDL.getLine(), FnStartDL.getCol(),
1517 FnStartDL.getScope(MF->getFunction()->getContext()),
1518 // We'd like to list the prologue as "not statements" but GDB behaves
1519 // poorly if we do that. Revisit this with caution/GDB (7.5+) testing.
1520 DWARF2_FLAG_IS_STMT);
1524 void DwarfDebug::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
1525 // SmallVector<DbgVariable *, 8> &Vars = ScopeVariables.lookup(LS);
1526 ScopeVariables[LS].push_back(Var);
1527 // Vars.push_back(Var);
1530 // Gather and emit post-function debug information.
1531 void DwarfDebug::endFunction(const MachineFunction *MF) {
1532 if (!MMI->hasDebugInfo() || LScopes.empty()) return;
1534 // Define end label for subprogram.
1535 FunctionEndSym = Asm->GetTempSymbol("func_end",
1536 Asm->getFunctionNumber());
1537 // Assumes in correct section after the entry point.
1538 Asm->OutStreamer.EmitLabel(FunctionEndSym);
1540 SmallPtrSet<const MDNode *, 16> ProcessedVars;
1541 collectVariableInfo(MF, ProcessedVars);
1543 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1544 CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1545 assert(TheCU && "Unable to find compile unit!");
1547 // Construct abstract scopes.
1548 ArrayRef<LexicalScope *> AList = LScopes.getAbstractScopesList();
1549 for (unsigned i = 0, e = AList.size(); i != e; ++i) {
1550 LexicalScope *AScope = AList[i];
1551 DISubprogram SP(AScope->getScopeNode());
1553 // Collect info for variables that were optimized out.
1554 DIArray Variables = SP.getVariables();
1555 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1556 DIVariable DV(Variables.getElement(i));
1557 if (!DV || !DV.Verify() || !ProcessedVars.insert(DV))
1559 // Check that DbgVariable for DV wasn't created earlier, when
1560 // findAbstractVariable() was called for inlined instance of DV.
1561 LLVMContext &Ctx = DV->getContext();
1562 DIVariable CleanDV = cleanseInlinedVariable(DV, Ctx);
1563 if (AbstractVariables.lookup(CleanDV))
1565 if (LexicalScope *Scope = LScopes.findAbstractScope(DV.getContext()))
1566 addScopeVariable(Scope, new DbgVariable(DV, NULL));
1569 if (ProcessedSPNodes.count(AScope->getScopeNode()) == 0)
1570 constructScopeDIE(TheCU, AScope);
1573 DIE *CurFnDIE = constructScopeDIE(TheCU, FnScope);
1575 if (!MF->getTarget().Options.DisableFramePointerElim(*MF))
1576 TheCU->addFlag(CurFnDIE, dwarf::DW_AT_APPLE_omit_frame_ptr);
1578 DebugFrames.push_back(FunctionDebugFrameInfo(Asm->getFunctionNumber(),
1579 MMI->getFrameMoves()));
1582 for (DenseMap<LexicalScope *, SmallVector<DbgVariable *, 8> >::iterator
1583 I = ScopeVariables.begin(), E = ScopeVariables.end(); I != E; ++I)
1584 DeleteContainerPointers(I->second);
1585 ScopeVariables.clear();
1586 DeleteContainerPointers(CurrentFnArguments);
1587 UserVariables.clear();
1589 AbstractVariables.clear();
1590 LabelsBeforeInsn.clear();
1591 LabelsAfterInsn.clear();
1595 // Register a source line with debug info. Returns the unique label that was
1596 // emitted and which provides correspondence to the source line list.
1597 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
1603 DIDescriptor Scope(S);
1605 if (Scope.isCompileUnit()) {
1606 DICompileUnit CU(S);
1607 Fn = CU.getFilename();
1608 Dir = CU.getDirectory();
1609 } else if (Scope.isFile()) {
1611 Fn = F.getFilename();
1612 Dir = F.getDirectory();
1613 } else if (Scope.isSubprogram()) {
1615 Fn = SP.getFilename();
1616 Dir = SP.getDirectory();
1617 } else if (Scope.isLexicalBlockFile()) {
1618 DILexicalBlockFile DBF(S);
1619 Fn = DBF.getFilename();
1620 Dir = DBF.getDirectory();
1621 } else if (Scope.isLexicalBlock()) {
1622 DILexicalBlock DB(S);
1623 Fn = DB.getFilename();
1624 Dir = DB.getDirectory();
1626 llvm_unreachable("Unexpected scope info");
1628 Src = getOrCreateSourceID(Fn, Dir);
1630 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0, 0, Fn);
1633 //===----------------------------------------------------------------------===//
1635 //===----------------------------------------------------------------------===//
1637 // Compute the size and offset of a DIE.
1639 DwarfDebug::computeSizeAndOffset(DIE *Die, unsigned Offset) {
1640 // Get the children.
1641 const std::vector<DIE *> &Children = Die->getChildren();
1643 // Record the abbreviation.
1644 assignAbbrevNumber(Die->getAbbrev());
1646 // Get the abbreviation for this DIE.
1647 unsigned AbbrevNumber = Die->getAbbrevNumber();
1648 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
1651 Die->setOffset(Offset);
1653 // Start the size with the size of abbreviation code.
1654 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
1656 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
1657 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
1659 // Size the DIE attribute values.
1660 for (unsigned i = 0, N = Values.size(); i < N; ++i)
1661 // Size attribute value.
1662 Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
1664 // Size the DIE children if any.
1665 if (!Children.empty()) {
1666 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
1667 "Children flag not set");
1669 for (unsigned j = 0, M = Children.size(); j < M; ++j)
1670 Offset = computeSizeAndOffset(Children[j], Offset);
1672 // End of children marker.
1673 Offset += sizeof(int8_t);
1676 Die->setSize(Offset - Die->getOffset());
1680 // Compute the size and offset of all the DIEs.
1681 void DwarfDebug::computeSizeAndOffsets() {
1684 sizeof(int32_t) + // Length of Compilation Unit Info
1685 sizeof(int16_t) + // DWARF version number
1686 sizeof(int32_t) + // Offset Into Abbrev. Section
1687 sizeof(int8_t); // Pointer Size (in bytes)
1689 computeSizeAndOffset(SkeletonCU->getCUDie(), Offset);
1691 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
1692 E = CUMap.end(); I != E; ++I) {
1693 // Compute size of compile unit header.
1695 sizeof(int32_t) + // Length of Compilation Unit Info
1696 sizeof(int16_t) + // DWARF version number
1697 sizeof(int32_t) + // Offset Into Abbrev. Section
1698 sizeof(int8_t); // Pointer Size (in bytes)
1699 computeSizeAndOffset(I->second->getCUDie(), Offset);
1703 // Emit initial Dwarf sections with a label at the start of each one.
1704 void DwarfDebug::emitSectionLabels() {
1705 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1707 // Dwarf sections base addresses.
1708 DwarfInfoSectionSym =
1709 emitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
1710 DwarfAbbrevSectionSym =
1711 emitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
1712 emitSectionSym(Asm, TLOF.getDwarfARangesSection());
1714 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
1715 emitSectionSym(Asm, MacroInfo);
1717 emitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
1718 emitSectionSym(Asm, TLOF.getDwarfLocSection());
1719 emitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
1720 DwarfStrSectionSym =
1721 emitSectionSym(Asm, TLOF.getDwarfStrSection(), "section_str");
1722 DwarfDebugRangeSectionSym = emitSectionSym(Asm, TLOF.getDwarfRangesSection(),
1725 DwarfDebugLocSectionSym = emitSectionSym(Asm, TLOF.getDwarfLocSection(),
1726 "section_debug_loc");
1728 TextSectionSym = emitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
1729 emitSectionSym(Asm, TLOF.getDataSection());
1732 // Recursively emits a debug information entry.
1733 void DwarfDebug::emitDIE(DIE *Die) {
1734 // Get the abbreviation for this DIE.
1735 unsigned AbbrevNumber = Die->getAbbrevNumber();
1736 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
1738 // Emit the code (index) for the abbreviation.
1739 if (Asm->isVerbose())
1740 Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
1741 Twine::utohexstr(Die->getOffset()) + ":0x" +
1742 Twine::utohexstr(Die->getSize()) + " " +
1743 dwarf::TagString(Abbrev->getTag()));
1744 Asm->EmitULEB128(AbbrevNumber);
1746 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
1747 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
1749 // Emit the DIE attribute values.
1750 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
1751 unsigned Attr = AbbrevData[i].getAttribute();
1752 unsigned Form = AbbrevData[i].getForm();
1753 assert(Form && "Too many attributes for DIE (check abbreviation)");
1755 if (Asm->isVerbose())
1756 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
1759 case dwarf::DW_AT_abstract_origin: {
1760 DIEEntry *E = cast<DIEEntry>(Values[i]);
1761 DIE *Origin = E->getEntry();
1762 unsigned Addr = Origin->getOffset();
1763 Asm->EmitInt32(Addr);
1766 case dwarf::DW_AT_ranges: {
1767 // DW_AT_range Value encodes offset in debug_range section.
1768 DIEInteger *V = cast<DIEInteger>(Values[i]);
1770 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections()) {
1771 Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym,
1775 Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
1777 DwarfDebugRangeSectionSym,
1782 case dwarf::DW_AT_location: {
1783 if (DIELabel *L = dyn_cast<DIELabel>(Values[i])) {
1784 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
1785 Asm->EmitLabelReference(L->getValue(), 4);
1787 Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
1789 Values[i]->EmitValue(Asm, Form);
1793 case dwarf::DW_AT_accessibility: {
1794 if (Asm->isVerbose()) {
1795 DIEInteger *V = cast<DIEInteger>(Values[i]);
1796 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
1798 Values[i]->EmitValue(Asm, Form);
1802 // Emit an attribute using the defined form.
1803 Values[i]->EmitValue(Asm, Form);
1808 // Emit the DIE children if any.
1809 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
1810 const std::vector<DIE *> &Children = Die->getChildren();
1812 for (unsigned j = 0, M = Children.size(); j < M; ++j)
1813 emitDIE(Children[j]);
1815 if (Asm->isVerbose())
1816 Asm->OutStreamer.AddComment("End Of Children Mark");
1821 void DwarfDebug::emitCompileUnits(const MCSection *Section) {
1822 Asm->OutStreamer.SwitchSection(Section);
1823 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
1824 E = CUMap.end(); I != E; ++I) {
1825 CompileUnit *TheCU = I->second;
1826 DIE *Die = TheCU->getCUDie();
1828 // Emit the compile units header.
1829 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_begin",
1830 TheCU->getUniqueID()));
1832 // Emit size of content not including length itself
1833 unsigned ContentSize = Die->getSize() +
1834 sizeof(int16_t) + // DWARF version number
1835 sizeof(int32_t) + // Offset Into Abbrev. Section
1836 sizeof(int8_t); // Pointer Size (in bytes)
1838 Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
1839 Asm->EmitInt32(ContentSize);
1840 Asm->OutStreamer.AddComment("DWARF version number");
1841 Asm->EmitInt16(dwarf::DWARF_VERSION);
1842 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
1843 Asm->EmitSectionOffset(Asm->GetTempSymbol("abbrev_begin"),
1844 DwarfAbbrevSectionSym);
1845 Asm->OutStreamer.AddComment("Address Size (in bytes)");
1846 Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
1849 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_end",
1850 TheCU->getUniqueID()));
1854 // Emit the debug info section.
1855 void DwarfDebug::emitDebugInfo() {
1856 if (!useSplitDwarf())
1857 emitCompileUnits(Asm->getObjFileLowering().getDwarfInfoSection());
1859 emitSkeletonCU(Asm->getObjFileLowering().getDwarfInfoSection());
1862 // Emit the abbreviation section.
1863 void DwarfDebug::emitAbbreviations() {
1864 // Check to see if it is worth the effort.
1865 if (!Abbreviations.empty()) {
1866 // Start the debug abbrev section.
1867 Asm->OutStreamer.SwitchSection(
1868 Asm->getObjFileLowering().getDwarfAbbrevSection());
1870 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_begin"));
1872 // For each abbrevation.
1873 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
1874 // Get abbreviation data
1875 const DIEAbbrev *Abbrev = Abbreviations[i];
1877 // Emit the abbrevations code (base 1 index.)
1878 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
1880 // Emit the abbreviations data.
1884 // Mark end of abbreviations.
1885 Asm->EmitULEB128(0, "EOM(3)");
1887 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_end"));
1891 // Emit the last address of the section and the end of the line matrix.
1892 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
1893 // Define last address of section.
1894 Asm->OutStreamer.AddComment("Extended Op");
1897 Asm->OutStreamer.AddComment("Op size");
1898 Asm->EmitInt8(Asm->getDataLayout().getPointerSize() + 1);
1899 Asm->OutStreamer.AddComment("DW_LNE_set_address");
1900 Asm->EmitInt8(dwarf::DW_LNE_set_address);
1902 Asm->OutStreamer.AddComment("Section end label");
1904 Asm->OutStreamer.EmitSymbolValue(Asm->GetTempSymbol("section_end",SectionEnd),
1905 Asm->getDataLayout().getPointerSize(),
1908 // Mark end of matrix.
1909 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
1915 // Emit visible names into a hashed accelerator table section.
1916 void DwarfDebug::emitAccelNames() {
1917 DwarfAccelTable AT(DwarfAccelTable::Atom(DwarfAccelTable::eAtomTypeDIEOffset,
1918 dwarf::DW_FORM_data4));
1919 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
1920 E = CUMap.end(); I != E; ++I) {
1921 CompileUnit *TheCU = I->second;
1922 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelNames();
1923 for (StringMap<std::vector<DIE*> >::const_iterator
1924 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
1925 const char *Name = GI->getKeyData();
1926 const std::vector<DIE *> &Entities = GI->second;
1927 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
1928 DE = Entities.end(); DI != DE; ++DI)
1929 AT.AddName(Name, (*DI));
1933 AT.FinalizeTable(Asm, "Names");
1934 Asm->OutStreamer.SwitchSection(
1935 Asm->getObjFileLowering().getDwarfAccelNamesSection());
1936 MCSymbol *SectionBegin = Asm->GetTempSymbol("names_begin");
1937 Asm->OutStreamer.EmitLabel(SectionBegin);
1939 // Emit the full data.
1940 AT.Emit(Asm, SectionBegin, this);
1943 // Emit objective C classes and categories into a hashed accelerator table section.
1944 void DwarfDebug::emitAccelObjC() {
1945 DwarfAccelTable AT(DwarfAccelTable::Atom(DwarfAccelTable::eAtomTypeDIEOffset,
1946 dwarf::DW_FORM_data4));
1947 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
1948 E = CUMap.end(); I != E; ++I) {
1949 CompileUnit *TheCU = I->second;
1950 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelObjC();
1951 for (StringMap<std::vector<DIE*> >::const_iterator
1952 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
1953 const char *Name = GI->getKeyData();
1954 const std::vector<DIE *> &Entities = GI->second;
1955 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
1956 DE = Entities.end(); DI != DE; ++DI)
1957 AT.AddName(Name, (*DI));
1961 AT.FinalizeTable(Asm, "ObjC");
1962 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
1963 .getDwarfAccelObjCSection());
1964 MCSymbol *SectionBegin = Asm->GetTempSymbol("objc_begin");
1965 Asm->OutStreamer.EmitLabel(SectionBegin);
1967 // Emit the full data.
1968 AT.Emit(Asm, SectionBegin, this);
1971 // Emit namespace dies into a hashed accelerator table.
1972 void DwarfDebug::emitAccelNamespaces() {
1973 DwarfAccelTable AT(DwarfAccelTable::Atom(DwarfAccelTable::eAtomTypeDIEOffset,
1974 dwarf::DW_FORM_data4));
1975 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
1976 E = CUMap.end(); I != E; ++I) {
1977 CompileUnit *TheCU = I->second;
1978 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelNamespace();
1979 for (StringMap<std::vector<DIE*> >::const_iterator
1980 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
1981 const char *Name = GI->getKeyData();
1982 const std::vector<DIE *> &Entities = GI->second;
1983 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
1984 DE = Entities.end(); DI != DE; ++DI)
1985 AT.AddName(Name, (*DI));
1989 AT.FinalizeTable(Asm, "namespac");
1990 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
1991 .getDwarfAccelNamespaceSection());
1992 MCSymbol *SectionBegin = Asm->GetTempSymbol("namespac_begin");
1993 Asm->OutStreamer.EmitLabel(SectionBegin);
1995 // Emit the full data.
1996 AT.Emit(Asm, SectionBegin, this);
1999 // Emit type dies into a hashed accelerator table.
2000 void DwarfDebug::emitAccelTypes() {
2001 std::vector<DwarfAccelTable::Atom> Atoms;
2002 Atoms.push_back(DwarfAccelTable::Atom(DwarfAccelTable::eAtomTypeDIEOffset,
2003 dwarf::DW_FORM_data4));
2004 Atoms.push_back(DwarfAccelTable::Atom(DwarfAccelTable::eAtomTypeTag,
2005 dwarf::DW_FORM_data2));
2006 Atoms.push_back(DwarfAccelTable::Atom(DwarfAccelTable::eAtomTypeTypeFlags,
2007 dwarf::DW_FORM_data1));
2008 DwarfAccelTable AT(Atoms);
2009 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2010 E = CUMap.end(); I != E; ++I) {
2011 CompileUnit *TheCU = I->second;
2012 const StringMap<std::vector<std::pair<DIE*, unsigned > > > &Names
2013 = TheCU->getAccelTypes();
2014 for (StringMap<std::vector<std::pair<DIE*, unsigned> > >::const_iterator
2015 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2016 const char *Name = GI->getKeyData();
2017 const std::vector<std::pair<DIE *, unsigned> > &Entities = GI->second;
2018 for (std::vector<std::pair<DIE *, unsigned> >::const_iterator DI
2019 = Entities.begin(), DE = Entities.end(); DI !=DE; ++DI)
2020 AT.AddName(Name, (*DI).first, (*DI).second);
2024 AT.FinalizeTable(Asm, "types");
2025 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
2026 .getDwarfAccelTypesSection());
2027 MCSymbol *SectionBegin = Asm->GetTempSymbol("types_begin");
2028 Asm->OutStreamer.EmitLabel(SectionBegin);
2030 // Emit the full data.
2031 AT.Emit(Asm, SectionBegin, this);
2034 void DwarfDebug::emitDebugPubTypes() {
2035 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2036 E = CUMap.end(); I != E; ++I) {
2037 CompileUnit *TheCU = I->second;
2038 // Start the dwarf pubtypes section.
2039 Asm->OutStreamer.SwitchSection(
2040 Asm->getObjFileLowering().getDwarfPubTypesSection());
2041 Asm->OutStreamer.AddComment("Length of Public Types Info");
2042 Asm->EmitLabelDifference(
2043 Asm->GetTempSymbol("pubtypes_end", TheCU->getUniqueID()),
2044 Asm->GetTempSymbol("pubtypes_begin", TheCU->getUniqueID()), 4);
2046 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_begin",
2047 TheCU->getUniqueID()));
2049 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DWARF Version");
2050 Asm->EmitInt16(dwarf::DWARF_VERSION);
2052 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2053 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin",
2054 TheCU->getUniqueID()),
2055 DwarfInfoSectionSym);
2057 Asm->OutStreamer.AddComment("Compilation Unit Length");
2058 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end",
2059 TheCU->getUniqueID()),
2060 Asm->GetTempSymbol("info_begin",
2061 TheCU->getUniqueID()),
2064 const StringMap<DIE*> &Globals = TheCU->getGlobalTypes();
2065 for (StringMap<DIE*>::const_iterator
2066 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2067 const char *Name = GI->getKeyData();
2068 DIE *Entity = GI->second;
2070 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2071 Asm->EmitInt32(Entity->getOffset());
2073 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("External Name");
2074 // Emit the name with a terminating null byte.
2075 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1), 0);
2078 Asm->OutStreamer.AddComment("End Mark");
2080 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_end",
2081 TheCU->getUniqueID()));
2085 // Emit visible names into a debug str section.
2086 void DwarfDebug::emitDebugStr() {
2087 // Check to see if it is worth the effort.
2088 if (StringPool.empty()) return;
2090 // Start the dwarf str section.
2091 Asm->OutStreamer.SwitchSection(
2092 Asm->getObjFileLowering().getDwarfStrSection());
2094 // Get all of the string pool entries and put them in an array by their ID so
2095 // we can sort them.
2096 SmallVector<std::pair<unsigned,
2097 StringMapEntry<std::pair<MCSymbol*, unsigned> >*>, 64> Entries;
2099 for (StringMap<std::pair<MCSymbol*, unsigned> >::iterator
2100 I = StringPool.begin(), E = StringPool.end(); I != E; ++I)
2101 Entries.push_back(std::make_pair(I->second.second, &*I));
2103 array_pod_sort(Entries.begin(), Entries.end());
2105 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2106 // Emit a label for reference from debug information entries.
2107 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
2109 // Emit the string itself with a terminating null byte.
2110 Asm->OutStreamer.EmitBytes(StringRef(Entries[i].second->getKeyData(),
2111 Entries[i].second->getKeyLength()+1),
2116 // Emit visible names into a debug loc section.
2117 void DwarfDebug::emitDebugLoc() {
2118 if (DotDebugLocEntries.empty())
2121 for (SmallVector<DotDebugLocEntry, 4>::iterator
2122 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2124 DotDebugLocEntry &Entry = *I;
2125 if (I + 1 != DotDebugLocEntries.end())
2129 // Start the dwarf loc section.
2130 Asm->OutStreamer.SwitchSection(
2131 Asm->getObjFileLowering().getDwarfLocSection());
2132 unsigned char Size = Asm->getDataLayout().getPointerSize();
2133 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
2135 for (SmallVector<DotDebugLocEntry, 4>::iterator
2136 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2137 I != E; ++I, ++index) {
2138 DotDebugLocEntry &Entry = *I;
2139 if (Entry.isMerged()) continue;
2140 if (Entry.isEmpty()) {
2141 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2142 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2143 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
2145 Asm->OutStreamer.EmitSymbolValue(Entry.Begin, Size, 0);
2146 Asm->OutStreamer.EmitSymbolValue(Entry.End, Size, 0);
2147 DIVariable DV(Entry.Variable);
2148 Asm->OutStreamer.AddComment("Loc expr size");
2149 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
2150 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
2151 Asm->EmitLabelDifference(end, begin, 2);
2152 Asm->OutStreamer.EmitLabel(begin);
2153 if (Entry.isInt()) {
2154 DIBasicType BTy(DV.getType());
2156 (BTy.getEncoding() == dwarf::DW_ATE_signed
2157 || BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
2158 Asm->OutStreamer.AddComment("DW_OP_consts");
2159 Asm->EmitInt8(dwarf::DW_OP_consts);
2160 Asm->EmitSLEB128(Entry.getInt());
2162 Asm->OutStreamer.AddComment("DW_OP_constu");
2163 Asm->EmitInt8(dwarf::DW_OP_constu);
2164 Asm->EmitULEB128(Entry.getInt());
2166 } else if (Entry.isLocation()) {
2167 if (!DV.hasComplexAddress())
2169 Asm->EmitDwarfRegOp(Entry.Loc);
2171 // Complex address entry.
2172 unsigned N = DV.getNumAddrElements();
2174 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
2175 if (Entry.Loc.getOffset()) {
2177 Asm->EmitDwarfRegOp(Entry.Loc);
2178 Asm->OutStreamer.AddComment("DW_OP_deref");
2179 Asm->EmitInt8(dwarf::DW_OP_deref);
2180 Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
2181 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2182 Asm->EmitSLEB128(DV.getAddrElement(1));
2184 // If first address element is OpPlus then emit
2185 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
2186 MachineLocation Loc(Entry.Loc.getReg(), DV.getAddrElement(1));
2187 Asm->EmitDwarfRegOp(Loc);
2191 Asm->EmitDwarfRegOp(Entry.Loc);
2194 // Emit remaining complex address elements.
2195 for (; i < N; ++i) {
2196 uint64_t Element = DV.getAddrElement(i);
2197 if (Element == DIBuilder::OpPlus) {
2198 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2199 Asm->EmitULEB128(DV.getAddrElement(++i));
2200 } else if (Element == DIBuilder::OpDeref) {
2201 if (!Entry.Loc.isReg())
2202 Asm->EmitInt8(dwarf::DW_OP_deref);
2204 llvm_unreachable("unknown Opcode found in complex address");
2208 // else ... ignore constant fp. There is not any good way to
2209 // to represent them here in dwarf.
2210 Asm->OutStreamer.EmitLabel(end);
2215 // Emit visible names into a debug aranges section.
2216 void DwarfDebug::emitDebugARanges() {
2217 // Start the dwarf aranges section.
2218 Asm->OutStreamer.SwitchSection(
2219 Asm->getObjFileLowering().getDwarfARangesSection());
2222 // Emit visible names into a debug ranges section.
2223 void DwarfDebug::emitDebugRanges() {
2224 // Start the dwarf ranges section.
2225 Asm->OutStreamer.SwitchSection(
2226 Asm->getObjFileLowering().getDwarfRangesSection());
2227 unsigned char Size = Asm->getDataLayout().getPointerSize();
2228 for (SmallVector<const MCSymbol *, 8>::iterator
2229 I = DebugRangeSymbols.begin(), E = DebugRangeSymbols.end();
2232 Asm->OutStreamer.EmitSymbolValue(const_cast<MCSymbol*>(*I), Size, 0);
2234 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2238 // Emit visible names into a debug macinfo section.
2239 void DwarfDebug::emitDebugMacInfo() {
2240 if (const MCSection *LineInfo =
2241 Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
2242 // Start the dwarf macinfo section.
2243 Asm->OutStreamer.SwitchSection(LineInfo);
2247 // Emit inline info using following format.
2249 // 1. length of section
2250 // 2. Dwarf version number
2253 // Entries (one "entry" for each function that was inlined):
2255 // 1. offset into __debug_str section for MIPS linkage name, if exists;
2256 // otherwise offset into __debug_str for regular function name.
2257 // 2. offset into __debug_str section for regular function name.
2258 // 3. an unsigned LEB128 number indicating the number of distinct inlining
2259 // instances for the function.
2261 // The rest of the entry consists of a {die_offset, low_pc} pair for each
2262 // inlined instance; the die_offset points to the inlined_subroutine die in the
2263 // __debug_info section, and the low_pc is the starting address for the
2264 // inlining instance.
2265 void DwarfDebug::emitDebugInlineInfo() {
2266 if (!Asm->MAI->doesDwarfUseInlineInfoSection())
2272 Asm->OutStreamer.SwitchSection(
2273 Asm->getObjFileLowering().getDwarfDebugInlineSection());
2275 Asm->OutStreamer.AddComment("Length of Debug Inlined Information Entry");
2276 Asm->EmitLabelDifference(Asm->GetTempSymbol("debug_inlined_end", 1),
2277 Asm->GetTempSymbol("debug_inlined_begin", 1), 4);
2279 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_begin", 1));
2281 Asm->OutStreamer.AddComment("Dwarf Version");
2282 Asm->EmitInt16(dwarf::DWARF_VERSION);
2283 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2284 Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
2286 for (SmallVector<const MDNode *, 4>::iterator I = InlinedSPNodes.begin(),
2287 E = InlinedSPNodes.end(); I != E; ++I) {
2289 const MDNode *Node = *I;
2290 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator II
2291 = InlineInfo.find(Node);
2292 SmallVector<InlineInfoLabels, 4> &Labels = II->second;
2293 DISubprogram SP(Node);
2294 StringRef LName = SP.getLinkageName();
2295 StringRef Name = SP.getName();
2297 Asm->OutStreamer.AddComment("MIPS linkage name");
2299 Asm->EmitSectionOffset(getStringPoolEntry(Name), DwarfStrSectionSym);
2301 Asm->EmitSectionOffset(getStringPoolEntry(getRealLinkageName(LName)),
2302 DwarfStrSectionSym);
2304 Asm->OutStreamer.AddComment("Function name");
2305 Asm->EmitSectionOffset(getStringPoolEntry(Name), DwarfStrSectionSym);
2306 Asm->EmitULEB128(Labels.size(), "Inline count");
2308 for (SmallVector<InlineInfoLabels, 4>::iterator LI = Labels.begin(),
2309 LE = Labels.end(); LI != LE; ++LI) {
2310 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2311 Asm->EmitInt32(LI->second->getOffset());
2313 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("low_pc");
2314 Asm->OutStreamer.EmitSymbolValue(LI->first,
2315 Asm->getDataLayout().getPointerSize(),0);
2319 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_end", 1));
2322 // DWARF5 Experimental Fission emitters.
2324 // This DIE has the following attributes: DW_AT_comp_dir, DW_AT_stmt_list,
2325 // DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges, DW_AT_dwo_name, DW_AT_dwo_id,
2326 // DW_AT_ranges_base, DW_AT_addr_base. If DW_AT_ranges is present,
2327 // DW_AT_low_pc and DW_AT_high_pc are not used, and vice versa.
2328 CompileUnit *DwarfDebug::constructSkeletonCU(const MDNode *N) {
2329 DICompileUnit DIUnit(N);
2330 StringRef FN = DIUnit.getFilename();
2331 CompilationDir = DIUnit.getDirectory();
2333 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
2334 CompileUnit *NewCU = new CompileUnit(GlobalCUIndexCount++,
2335 DIUnit.getLanguage(), Die, Asm, this);
2336 // FIXME: This should be the .dwo file.
2337 NewCU->addString(Die, dwarf::DW_AT_GNU_dwo_name, FN);
2339 // FIXME: We also need DW_AT_addr_base and DW_AT_dwo_id.
2341 // 2.17.1 requires that we use DW_AT_low_pc for a single entry point
2343 NewCU->addUInt(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, 0);
2344 // DW_AT_stmt_list is a offset of line number information for this
2345 // compile unit in debug_line section.
2346 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2347 NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
2348 Asm->GetTempSymbol("section_line"));
2350 NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0);
2352 if (!CompilationDir.empty())
2353 NewCU->addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
2358 void DwarfDebug::emitSkeletonCU(const MCSection *Section) {
2359 Asm->OutStreamer.SwitchSection(Section);
2360 DIE *Die = SkeletonCU->getCUDie();
2362 // Emit the compile units header.
2363 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("skel_info_begin",
2364 SkeletonCU->getUniqueID()));
2366 // Emit size of content not including length itself
2367 unsigned ContentSize = Die->getSize() +
2368 sizeof(int16_t) + // DWARF version number
2369 sizeof(int32_t) + // Offset Into Abbrev. Section
2370 sizeof(int8_t); // Pointer Size (in bytes)
2372 Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
2373 Asm->EmitInt32(ContentSize);
2374 Asm->OutStreamer.AddComment("DWARF version number");
2375 Asm->EmitInt16(dwarf::DWARF_VERSION);
2376 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
2377 Asm->EmitSectionOffset(Asm->GetTempSymbol("abbrev_begin"),
2378 DwarfAbbrevSectionSym);
2379 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2380 Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
2383 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("skel_info_end",
2384 SkeletonCU->getUniqueID()));
2389 // Emit the .debug_info.dwo section for fission. This contains the compile
2390 // units that would normally be in debug_info.
2391 void DwarfDebug::emitDebugInfoDWO() {
2392 assert(useSplitDwarf() && "No split dwarf debug info?");
2393 emitCompileUnits(Asm->getObjFileLowering().getDwarfInfoDWOSection());