1 //===-- llvm/CodeGen/DwarfDebug.cpp - Dwarf Debug Framework ---------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains support for writing dwarf debug info into asm files.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "dwarfdebug"
15 #include "DwarfDebug.h"
18 #include "DwarfAccelTable.h"
19 #include "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/DIBuilder.h"
27 #include "llvm/DebugInfo.h"
28 #include "llvm/IR/Constants.h"
29 #include "llvm/IR/DataLayout.h"
30 #include "llvm/IR/Instructions.h"
31 #include "llvm/IR/Module.h"
32 #include "llvm/MC/MCAsmInfo.h"
33 #include "llvm/MC/MCSection.h"
34 #include "llvm/MC/MCStreamer.h"
35 #include "llvm/MC/MCSymbol.h"
36 #include "llvm/Support/CommandLine.h"
37 #include "llvm/Support/Debug.h"
38 #include "llvm/Support/Dwarf.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/FormattedStream.h"
41 #include "llvm/Support/MD5.h"
42 #include "llvm/Support/Path.h"
43 #include "llvm/Support/Timer.h"
44 #include "llvm/Support/ValueHandle.h"
45 #include "llvm/Target/TargetFrameLowering.h"
46 #include "llvm/Target/TargetLoweringObjectFile.h"
47 #include "llvm/Target/TargetMachine.h"
48 #include "llvm/Target/TargetOptions.h"
49 #include "llvm/Target/TargetRegisterInfo.h"
53 DisableDebugInfoPrinting("disable-debug-info-print", cl::Hidden,
54 cl::desc("Disable debug info printing"));
56 static cl::opt<bool> UnknownLocations(
57 "use-unknown-locations", cl::Hidden,
58 cl::desc("Make an absence of debug location information explicit."),
62 GenerateODRHash("generate-odr-hash", cl::Hidden,
63 cl::desc("Add an ODR hash to external type DIEs."),
67 GenerateCUHash("generate-cu-hash", cl::Hidden,
68 cl::desc("Add the CU hash as the dwo_id."),
72 GenerateGnuPubSections("generate-gnu-dwarf-pub-sections", cl::Hidden,
73 cl::desc("Generate GNU-style pubnames and pubtypes"),
84 static cl::opt<DefaultOnOff>
85 DwarfAccelTables("dwarf-accel-tables", cl::Hidden,
86 cl::desc("Output prototype dwarf accelerator tables."),
87 cl::values(clEnumVal(Default, "Default for platform"),
88 clEnumVal(Enable, "Enabled"),
89 clEnumVal(Disable, "Disabled"), clEnumValEnd),
92 static cl::opt<DefaultOnOff>
93 SplitDwarf("split-dwarf", cl::Hidden,
94 cl::desc("Output prototype dwarf split debug info."),
95 cl::values(clEnumVal(Default, "Default for platform"),
96 clEnumVal(Enable, "Enabled"),
97 clEnumVal(Disable, "Disabled"), clEnumValEnd),
100 static cl::opt<DefaultOnOff>
101 DwarfPubSections("generate-dwarf-pub-sections", cl::Hidden,
102 cl::desc("Generate DWARF pubnames and pubtypes sections"),
103 cl::values(clEnumVal(Default, "Default for platform"),
104 clEnumVal(Enable, "Enabled"),
105 clEnumVal(Disable, "Disabled"), clEnumValEnd),
108 static const char *const DWARFGroupName = "DWARF Emission";
109 static const char *const DbgTimerName = "DWARF Debug Writer";
111 //===----------------------------------------------------------------------===//
113 // Configuration values for initial hash set sizes (log2).
115 static const unsigned InitAbbreviationsSetSize = 9; // log2(512)
119 /// resolve - Look in the DwarfDebug map for the MDNode that
120 /// corresponds to the reference.
121 template <typename T>
122 T DbgVariable::resolve(DIRef<T> Ref) const {
123 return DD->resolve(Ref);
126 DIType DbgVariable::getType() const {
127 DIType Ty = Var.getType();
128 // FIXME: isBlockByrefVariable should be reformulated in terms of complex
129 // addresses instead.
130 if (Var.isBlockByrefVariable()) {
131 /* Byref variables, in Blocks, are declared by the programmer as
132 "SomeType VarName;", but the compiler creates a
133 __Block_byref_x_VarName struct, and gives the variable VarName
134 either the struct, or a pointer to the struct, as its type. This
135 is necessary for various behind-the-scenes things the compiler
136 needs to do with by-reference variables in blocks.
138 However, as far as the original *programmer* is concerned, the
139 variable should still have type 'SomeType', as originally declared.
141 The following function dives into the __Block_byref_x_VarName
142 struct to find the original type of the variable. This will be
143 passed back to the code generating the type for the Debug
144 Information Entry for the variable 'VarName'. 'VarName' will then
145 have the original type 'SomeType' in its debug information.
147 The original type 'SomeType' will be the type of the field named
148 'VarName' inside the __Block_byref_x_VarName struct.
150 NOTE: In order for this to not completely fail on the debugger
151 side, the Debug Information Entry for the variable VarName needs to
152 have a DW_AT_location that tells the debugger how to unwind through
153 the pointers and __Block_byref_x_VarName struct to find the actual
154 value of the variable. The function addBlockByrefType does this. */
156 uint16_t tag = Ty.getTag();
158 if (tag == dwarf::DW_TAG_pointer_type)
159 subType = resolve(DIDerivedType(Ty).getTypeDerivedFrom());
161 DIArray Elements = DICompositeType(subType).getTypeArray();
162 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
163 DIDerivedType DT = DIDerivedType(Elements.getElement(i));
164 if (getName() == DT.getName())
165 return (resolve(DT.getTypeDerivedFrom()));
171 } // end llvm namespace
173 /// Return Dwarf Version by checking module flags.
174 static unsigned getDwarfVersionFromModule(const Module *M) {
175 Value *Val = M->getModuleFlag("Dwarf Version");
177 return dwarf::DWARF_VERSION;
178 return cast<ConstantInt>(Val)->getZExtValue();
181 DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
182 : Asm(A), MMI(Asm->MMI), FirstCU(0),
183 AbbreviationsSet(InitAbbreviationsSetSize),
184 SourceIdMap(DIEValueAllocator),
185 PrevLabel(NULL), GlobalCUIndexCount(0),
186 InfoHolder(A, &AbbreviationsSet, Abbreviations, "info_string",
188 SkeletonAbbrevSet(InitAbbreviationsSetSize),
189 SkeletonHolder(A, &SkeletonAbbrevSet, SkeletonAbbrevs, "skel_string",
192 DwarfInfoSectionSym = DwarfAbbrevSectionSym = 0;
193 DwarfStrSectionSym = TextSectionSym = 0;
194 DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = DwarfLineSectionSym = 0;
195 DwarfAddrSectionSym = 0;
196 DwarfAbbrevDWOSectionSym = DwarfStrDWOSectionSym = 0;
197 FunctionBeginSym = FunctionEndSym = 0;
199 // Turn on accelerator tables for Darwin by default, pubnames by
200 // default for non-Darwin, and handle split dwarf.
201 bool IsDarwin = Triple(A->getTargetTriple()).isOSDarwin();
203 if (DwarfAccelTables == Default)
204 HasDwarfAccelTables = IsDarwin;
206 HasDwarfAccelTables = DwarfAccelTables == Enable;
208 if (SplitDwarf == Default)
209 HasSplitDwarf = false;
211 HasSplitDwarf = SplitDwarf == Enable;
213 if (DwarfPubSections == Default)
214 HasDwarfPubSections = !IsDarwin;
216 HasDwarfPubSections = DwarfPubSections == Enable;
218 DwarfVersion = getDwarfVersionFromModule(MMI->getModule());
221 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
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 = 0) {
230 Asm->OutStreamer.SwitchSection(Section);
231 if (!SymbolStem) return 0;
233 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
234 Asm->OutStreamer.EmitLabel(TmpSym);
238 MCSymbol *DwarfUnits::getStringPoolSym() {
239 return Asm->GetTempSymbol(StringPref);
242 MCSymbol *DwarfUnits::getStringPoolEntry(StringRef Str) {
243 std::pair<MCSymbol*, unsigned> &Entry =
244 StringPool.GetOrCreateValue(Str).getValue();
245 if (Entry.first) return Entry.first;
247 Entry.second = NextStringPoolNumber++;
248 return Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
251 unsigned DwarfUnits::getStringPoolIndex(StringRef Str) {
252 std::pair<MCSymbol*, unsigned> &Entry =
253 StringPool.GetOrCreateValue(Str).getValue();
254 if (Entry.first) return Entry.second;
256 Entry.second = NextStringPoolNumber++;
257 Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
261 unsigned DwarfUnits::getAddrPoolIndex(const MCSymbol *Sym) {
262 return getAddrPoolIndex(MCSymbolRefExpr::Create(Sym, Asm->OutContext));
265 unsigned DwarfUnits::getAddrPoolIndex(const MCExpr *Sym) {
266 std::pair<DenseMap<const MCExpr *, unsigned>::iterator, bool> P =
267 AddressPool.insert(std::make_pair(Sym, NextAddrPoolNumber));
269 ++NextAddrPoolNumber;
270 return P.first->second;
273 // Define a unique number for the abbreviation.
275 void DwarfUnits::assignAbbrevNumber(DIEAbbrev &Abbrev) {
276 // Check the set for priors.
277 DIEAbbrev *InSet = AbbreviationsSet->GetOrInsertNode(&Abbrev);
279 // If it's newly added.
280 if (InSet == &Abbrev) {
281 // Add to abbreviation list.
282 Abbreviations.push_back(&Abbrev);
284 // Assign the vector position + 1 as its number.
285 Abbrev.setNumber(Abbreviations.size());
287 // Assign existing abbreviation number.
288 Abbrev.setNumber(InSet->getNumber());
292 static bool isObjCClass(StringRef Name) {
293 return Name.startswith("+") || Name.startswith("-");
296 static bool hasObjCCategory(StringRef Name) {
297 if (!isObjCClass(Name)) return false;
299 return Name.find(") ") != StringRef::npos;
302 static void getObjCClassCategory(StringRef In, StringRef &Class,
303 StringRef &Category) {
304 if (!hasObjCCategory(In)) {
305 Class = In.slice(In.find('[') + 1, In.find(' '));
310 Class = In.slice(In.find('[') + 1, In.find('('));
311 Category = In.slice(In.find('[') + 1, In.find(' '));
315 static StringRef getObjCMethodName(StringRef In) {
316 return In.slice(In.find(' ') + 1, In.find(']'));
319 // Helper for sorting sections into a stable output order.
320 static bool SectionSort(const MCSection *A, const MCSection *B) {
321 std::string LA = (A ? A->getLabelBeginName() : "");
322 std::string LB = (B ? B->getLabelBeginName() : "");
326 // Add the various names to the Dwarf accelerator table names.
327 // TODO: Determine whether or not we should add names for programs
328 // that do not have a DW_AT_name or DW_AT_linkage_name field - this
329 // is only slightly different than the lookup of non-standard ObjC names.
330 static void addSubprogramNames(CompileUnit *TheCU, DISubprogram SP,
332 if (!SP.isDefinition()) return;
333 TheCU->addAccelName(SP.getName(), Die);
335 // If the linkage name is different than the name, go ahead and output
336 // that as well into the name table.
337 if (SP.getLinkageName() != "" && SP.getName() != SP.getLinkageName())
338 TheCU->addAccelName(SP.getLinkageName(), Die);
340 // If this is an Objective-C selector name add it to the ObjC accelerator
342 if (isObjCClass(SP.getName())) {
343 StringRef Class, Category;
344 getObjCClassCategory(SP.getName(), Class, Category);
345 TheCU->addAccelObjC(Class, Die);
347 TheCU->addAccelObjC(Category, Die);
348 // Also add the base method name to the name table.
349 TheCU->addAccelName(getObjCMethodName(SP.getName()), Die);
353 /// isSubprogramContext - Return true if Context is either a subprogram
354 /// or another context nested inside a subprogram.
355 bool DwarfDebug::isSubprogramContext(const MDNode *Context) {
358 DIDescriptor D(Context);
359 if (D.isSubprogram())
362 return isSubprogramContext(resolve(DIType(Context).getContext()));
366 // Find DIE for the given subprogram and attach appropriate DW_AT_low_pc
367 // and DW_AT_high_pc attributes. If there are global variables in this
368 // scope then create and insert DIEs for these variables.
369 DIE *DwarfDebug::updateSubprogramScopeDIE(CompileUnit *SPCU,
370 const MDNode *SPNode) {
371 DIE *SPDie = SPCU->getDIE(SPNode);
373 assert(SPDie && "Unable to find subprogram DIE!");
374 DISubprogram SP(SPNode);
376 // If we're updating an abstract DIE, then we will be adding the children and
377 // object pointer later on. But what we don't want to do is process the
378 // concrete DIE twice.
379 if (DIE *AbsSPDIE = AbstractSPDies.lookup(SPNode)) {
380 // Pick up abstract subprogram DIE.
381 SPDie = SPCU->createAndAddDIE(dwarf::DW_TAG_subprogram, *SPCU->getCUDie());
382 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_abstract_origin, AbsSPDIE);
384 DISubprogram SPDecl = SP.getFunctionDeclaration();
385 if (!SPDecl.isSubprogram()) {
386 // There is not any need to generate specification DIE for a function
387 // defined at compile unit level. If a function is defined inside another
388 // function then gdb prefers the definition at top level and but does not
389 // expect specification DIE in parent function. So avoid creating
390 // specification DIE for a function defined inside a function.
391 DIScope SPContext = resolve(SP.getContext());
392 if (SP.isDefinition() && !SPContext.isCompileUnit() &&
393 !SPContext.isFile() &&
394 !isSubprogramContext(SPContext)) {
395 SPCU->addFlag(SPDie, dwarf::DW_AT_declaration);
398 DICompositeType SPTy = SP.getType();
399 DIArray Args = SPTy.getTypeArray();
400 uint16_t SPTag = SPTy.getTag();
401 if (SPTag == dwarf::DW_TAG_subroutine_type)
402 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
404 SPCU->createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
405 DIType ATy = DIType(Args.getElement(i));
406 SPCU->addType(Arg, ATy);
407 if (ATy.isArtificial())
408 SPCU->addFlag(Arg, dwarf::DW_AT_artificial);
409 if (ATy.isObjectPointer())
410 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_object_pointer, Arg);
412 DIE *SPDeclDie = SPDie;
414 SPCU->createAndAddDIE(dwarf::DW_TAG_subprogram, *SPCU->getCUDie());
415 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification, SPDeclDie);
420 SPCU->addLabelAddress(SPDie, dwarf::DW_AT_low_pc,
421 Asm->GetTempSymbol("func_begin",
422 Asm->getFunctionNumber()));
423 SPCU->addLabelAddress(SPDie, dwarf::DW_AT_high_pc,
424 Asm->GetTempSymbol("func_end",
425 Asm->getFunctionNumber()));
426 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
427 MachineLocation Location(RI->getFrameRegister(*Asm->MF));
428 SPCU->addAddress(SPDie, dwarf::DW_AT_frame_base, Location);
430 // Add name to the name table, we do this here because we're guaranteed
431 // to have concrete versions of our DW_TAG_subprogram nodes.
432 addSubprogramNames(SPCU, SP, SPDie);
437 /// Check whether we should create a DIE for the given Scope, return true
438 /// if we don't create a DIE (the corresponding DIE is null).
439 bool DwarfDebug::isLexicalScopeDIENull(LexicalScope *Scope) {
440 if (Scope->isAbstractScope())
443 // We don't create a DIE if there is no Range.
444 const SmallVectorImpl<InsnRange> &Ranges = Scope->getRanges();
448 if (Ranges.size() > 1)
451 // We don't create a DIE if we have a single Range and the end label
453 SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin();
454 MCSymbol *End = getLabelAfterInsn(RI->second);
458 // Construct new DW_TAG_lexical_block for this scope and attach
459 // DW_AT_low_pc/DW_AT_high_pc labels.
460 DIE *DwarfDebug::constructLexicalScopeDIE(CompileUnit *TheCU,
461 LexicalScope *Scope) {
462 if (isLexicalScopeDIENull(Scope))
465 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_lexical_block);
466 if (Scope->isAbstractScope())
469 const SmallVectorImpl<InsnRange> &Ranges = Scope->getRanges();
470 // If we have multiple ranges, emit them into the range section.
471 if (Ranges.size() > 1) {
472 // .debug_range section has not been laid out yet. Emit offset in
473 // .debug_range as a uint, size 4, for now. emitDIE will handle
474 // DW_AT_ranges appropriately.
475 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_ranges, dwarf::DW_FORM_data4,
476 DebugRangeSymbols.size()
477 * Asm->getDataLayout().getPointerSize());
478 for (SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin(),
479 RE = Ranges.end(); RI != RE; ++RI) {
480 DebugRangeSymbols.push_back(getLabelBeforeInsn(RI->first));
481 DebugRangeSymbols.push_back(getLabelAfterInsn(RI->second));
484 // Terminate the range list.
485 DebugRangeSymbols.push_back(NULL);
486 DebugRangeSymbols.push_back(NULL);
490 // Construct the address range for this DIE.
491 SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin();
492 MCSymbol *Start = getLabelBeforeInsn(RI->first);
493 MCSymbol *End = getLabelAfterInsn(RI->second);
494 assert(End && "End label should not be null!");
496 assert(Start->isDefined() && "Invalid starting label for an inlined scope!");
497 assert(End->isDefined() && "Invalid end label for an inlined scope!");
499 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_low_pc, Start);
500 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_high_pc, End);
505 // This scope represents inlined body of a function. Construct DIE to
506 // represent this concrete inlined copy of the function.
507 DIE *DwarfDebug::constructInlinedScopeDIE(CompileUnit *TheCU,
508 LexicalScope *Scope) {
509 const SmallVectorImpl<InsnRange> &Ranges = Scope->getRanges();
510 assert(Ranges.empty() == false &&
511 "LexicalScope does not have instruction markers!");
513 if (!Scope->getScopeNode())
515 DIScope DS(Scope->getScopeNode());
516 DISubprogram InlinedSP = getDISubprogram(DS);
517 DIE *OriginDIE = TheCU->getDIE(InlinedSP);
519 DEBUG(dbgs() << "Unable to find original DIE for an inlined subprogram.");
523 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine);
524 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin, OriginDIE);
526 if (Ranges.size() > 1) {
527 // .debug_range section has not been laid out yet. Emit offset in
528 // .debug_range as a uint, size 4, for now. emitDIE will handle
529 // DW_AT_ranges appropriately.
530 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_ranges, dwarf::DW_FORM_data4,
531 DebugRangeSymbols.size()
532 * Asm->getDataLayout().getPointerSize());
533 for (SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin(),
534 RE = Ranges.end(); RI != RE; ++RI) {
535 DebugRangeSymbols.push_back(getLabelBeforeInsn(RI->first));
536 DebugRangeSymbols.push_back(getLabelAfterInsn(RI->second));
538 DebugRangeSymbols.push_back(NULL);
539 DebugRangeSymbols.push_back(NULL);
541 SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin();
542 MCSymbol *StartLabel = getLabelBeforeInsn(RI->first);
543 MCSymbol *EndLabel = getLabelAfterInsn(RI->second);
545 if (StartLabel == 0 || EndLabel == 0)
546 llvm_unreachable("Unexpected Start and End labels for an inlined scope!");
548 assert(StartLabel->isDefined() &&
549 "Invalid starting label for an inlined scope!");
550 assert(EndLabel->isDefined() && "Invalid end label for an inlined scope!");
552 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_low_pc, StartLabel);
553 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_high_pc, EndLabel);
556 InlinedSubprogramDIEs.insert(OriginDIE);
558 // Add the call site information to the DIE.
559 DILocation DL(Scope->getInlinedAt());
560 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_file, None,
561 getOrCreateSourceID(DL.getFilename(), DL.getDirectory(),
562 TheCU->getUniqueID()));
563 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_line, None, DL.getLineNumber());
565 // Add name to the name table, we do this here because we're guaranteed
566 // to have concrete versions of our DW_TAG_inlined_subprogram nodes.
567 addSubprogramNames(TheCU, InlinedSP, ScopeDIE);
572 DIE *DwarfDebug::createScopeChildrenDIE(CompileUnit *TheCU, LexicalScope *Scope,
573 SmallVectorImpl<DIE*> &Children) {
574 DIE *ObjectPointer = NULL;
576 // Collect arguments for current function.
577 if (LScopes.isCurrentFunctionScope(Scope))
578 for (unsigned i = 0, N = CurrentFnArguments.size(); i < N; ++i)
579 if (DbgVariable *ArgDV = CurrentFnArguments[i])
581 TheCU->constructVariableDIE(ArgDV, Scope->isAbstractScope())) {
582 Children.push_back(Arg);
583 if (ArgDV->isObjectPointer()) ObjectPointer = Arg;
586 // Collect lexical scope children first.
587 const SmallVectorImpl<DbgVariable *> &Variables =ScopeVariables.lookup(Scope);
588 for (unsigned i = 0, N = Variables.size(); i < N; ++i)
590 TheCU->constructVariableDIE(Variables[i], Scope->isAbstractScope())) {
591 Children.push_back(Variable);
592 if (Variables[i]->isObjectPointer()) ObjectPointer = Variable;
594 const SmallVectorImpl<LexicalScope *> &Scopes = Scope->getChildren();
595 for (unsigned j = 0, M = Scopes.size(); j < M; ++j)
596 if (DIE *Nested = constructScopeDIE(TheCU, Scopes[j]))
597 Children.push_back(Nested);
598 return ObjectPointer;
601 // Construct a DIE for this scope.
602 DIE *DwarfDebug::constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope) {
603 if (!Scope || !Scope->getScopeNode())
606 DIScope DS(Scope->getScopeNode());
608 SmallVector<DIE *, 8> Children;
609 DIE *ObjectPointer = NULL;
610 bool ChildrenCreated = false;
612 // We try to create the scope DIE first, then the children DIEs. This will
613 // avoid creating un-used children then removing them later when we find out
614 // the scope DIE is null.
615 DIE *ScopeDIE = NULL;
616 if (Scope->getInlinedAt())
617 ScopeDIE = constructInlinedScopeDIE(TheCU, Scope);
618 else if (DS.isSubprogram()) {
619 ProcessedSPNodes.insert(DS);
620 if (Scope->isAbstractScope()) {
621 ScopeDIE = TheCU->getDIE(DS);
622 // Note down abstract DIE.
624 AbstractSPDies.insert(std::make_pair(DS, ScopeDIE));
627 ScopeDIE = updateSubprogramScopeDIE(TheCU, DS);
630 // Early exit when we know the scope DIE is going to be null.
631 if (isLexicalScopeDIENull(Scope))
634 // We create children here when we know the scope DIE is not going to be
635 // null and the children will be added to the scope DIE.
636 ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
637 ChildrenCreated = true;
639 // There is no need to emit empty lexical block DIE.
640 std::pair<ImportedEntityMap::const_iterator,
641 ImportedEntityMap::const_iterator> Range = std::equal_range(
642 ScopesWithImportedEntities.begin(), ScopesWithImportedEntities.end(),
643 std::pair<const MDNode *, const MDNode *>(DS, (const MDNode*)0),
645 if (Children.empty() && Range.first == Range.second)
647 ScopeDIE = constructLexicalScopeDIE(TheCU, Scope);
648 assert(ScopeDIE && "Scope DIE should not be null.");
649 for (ImportedEntityMap::const_iterator i = Range.first; i != Range.second;
651 constructImportedEntityDIE(TheCU, i->second, ScopeDIE);
655 assert(Children.empty() &&
656 "We create children only when the scope DIE is not null.");
659 if (!ChildrenCreated)
660 // We create children when the scope DIE is not null.
661 ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
664 for (SmallVectorImpl<DIE *>::iterator I = Children.begin(),
665 E = Children.end(); I != E; ++I)
666 ScopeDIE->addChild(*I);
668 if (DS.isSubprogram() && ObjectPointer != NULL)
669 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, ObjectPointer);
671 if (DS.isSubprogram())
672 TheCU->addPubTypes(DISubprogram(DS));
677 // Look up the source id with the given directory and source file names.
678 // If none currently exists, create a new id and insert it in the
679 // SourceIds map. This can update DirectoryNames and SourceFileNames maps
681 unsigned DwarfDebug::getOrCreateSourceID(StringRef FileName,
682 StringRef DirName, unsigned CUID) {
683 // If we use .loc in assembly, we can't separate .file entries according to
684 // compile units. Thus all files will belong to the default compile unit.
686 // FIXME: add a better feature test than hasRawTextSupport. Even better,
687 // extend .file to support this.
688 if (Asm->TM.hasMCUseLoc() && Asm->OutStreamer.hasRawTextSupport())
691 // If FE did not provide a file name, then assume stdin.
692 if (FileName.empty())
693 return getOrCreateSourceID("<stdin>", StringRef(), CUID);
695 // TODO: this might not belong here. See if we can factor this better.
696 if (DirName == CompilationDir)
699 // FileIDCUMap stores the current ID for the given compile unit.
700 unsigned SrcId = FileIDCUMap[CUID] + 1;
702 // We look up the CUID/file/dir by concatenating them with a zero byte.
703 SmallString<128> NamePair;
704 NamePair += utostr(CUID);
707 NamePair += '\0'; // Zero bytes are not allowed in paths.
708 NamePair += FileName;
710 StringMapEntry<unsigned> &Ent = SourceIdMap.GetOrCreateValue(NamePair, SrcId);
711 if (Ent.getValue() != SrcId)
712 return Ent.getValue();
714 FileIDCUMap[CUID] = SrcId;
715 // Print out a .file directive to specify files for .loc directives.
716 Asm->OutStreamer.EmitDwarfFileDirective(SrcId, DirName, FileName, CUID);
721 // Create new CompileUnit for the given metadata node with tag
722 // DW_TAG_compile_unit.
723 CompileUnit *DwarfDebug::constructCompileUnit(const MDNode *N) {
724 DICompileUnit DIUnit(N);
725 StringRef FN = DIUnit.getFilename();
726 CompilationDir = DIUnit.getDirectory();
728 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
730 new CompileUnit(GlobalCUIndexCount++, Die, N, Asm, this, &InfoHolder);
732 FileIDCUMap[NewCU->getUniqueID()] = 0;
733 // Call this to emit a .file directive if it wasn't emitted for the source
734 // file this CU comes from yet.
735 getOrCreateSourceID(FN, CompilationDir, NewCU->getUniqueID());
737 NewCU->addString(Die, dwarf::DW_AT_producer, DIUnit.getProducer());
738 NewCU->addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
739 DIUnit.getLanguage());
740 NewCU->addString(Die, dwarf::DW_AT_name, FN);
742 // 2.17.1 requires that we use DW_AT_low_pc for a single entry point
743 // into an entity. We're using 0 (or a NULL label) for this. For
744 // split dwarf it's in the skeleton CU so omit it here.
745 if (!useSplitDwarf())
746 NewCU->addLabelAddress(Die, dwarf::DW_AT_low_pc, NULL);
748 // Define start line table label for each Compile Unit.
749 MCSymbol *LineTableStartSym = Asm->GetTempSymbol("line_table_start",
750 NewCU->getUniqueID());
751 Asm->OutStreamer.getContext().setMCLineTableSymbol(LineTableStartSym,
752 NewCU->getUniqueID());
754 // Use a single line table if we are using .loc and generating assembly.
756 (Asm->TM.hasMCUseLoc() && Asm->OutStreamer.hasRawTextSupport()) ||
757 (NewCU->getUniqueID() == 0);
759 if (!useSplitDwarf()) {
760 // DW_AT_stmt_list is a offset of line number information for this
761 // compile unit in debug_line section. For split dwarf this is
762 // left in the skeleton CU and so not included.
763 // The line table entries are not always emitted in assembly, so it
764 // is not okay to use line_table_start here.
765 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
766 NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_sec_offset,
767 UseTheFirstCU ? Asm->GetTempSymbol("section_line")
768 : LineTableStartSym);
769 else if (UseTheFirstCU)
770 NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0);
772 NewCU->addDelta(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
773 LineTableStartSym, DwarfLineSectionSym);
775 // If we're using split dwarf the compilation dir is going to be in the
776 // skeleton CU and so we don't need to duplicate it here.
777 if (!CompilationDir.empty())
778 NewCU->addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
780 // Flags to let the linker know we have emitted new style pubnames. Only
781 // emit it here if we don't have a skeleton CU for split dwarf.
782 if (GenerateGnuPubSections) {
783 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
784 NewCU->addLabel(Die, dwarf::DW_AT_GNU_pubnames,
785 dwarf::DW_FORM_sec_offset,
786 Asm->GetTempSymbol("gnu_pubnames",
787 NewCU->getUniqueID()));
789 NewCU->addDelta(Die, dwarf::DW_AT_GNU_pubnames, dwarf::DW_FORM_data4,
790 Asm->GetTempSymbol("gnu_pubnames",
791 NewCU->getUniqueID()),
792 DwarfGnuPubNamesSectionSym);
794 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
795 NewCU->addLabel(Die, dwarf::DW_AT_GNU_pubtypes,
796 dwarf::DW_FORM_sec_offset,
797 Asm->GetTempSymbol("gnu_pubtypes",
798 NewCU->getUniqueID()));
800 NewCU->addDelta(Die, dwarf::DW_AT_GNU_pubtypes, dwarf::DW_FORM_data4,
801 Asm->GetTempSymbol("gnu_pubtypes",
802 NewCU->getUniqueID()),
803 DwarfGnuPubTypesSectionSym);
807 if (DIUnit.isOptimized())
808 NewCU->addFlag(Die, dwarf::DW_AT_APPLE_optimized);
810 StringRef Flags = DIUnit.getFlags();
812 NewCU->addString(Die, dwarf::DW_AT_APPLE_flags, Flags);
814 if (unsigned RVer = DIUnit.getRunTimeVersion())
815 NewCU->addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
816 dwarf::DW_FORM_data1, RVer);
821 InfoHolder.addUnit(NewCU);
823 CUMap.insert(std::make_pair(N, NewCU));
824 CUDieMap.insert(std::make_pair(Die, NewCU));
828 // Construct subprogram DIE.
829 void DwarfDebug::constructSubprogramDIE(CompileUnit *TheCU, const MDNode *N) {
830 // FIXME: We should only call this routine once, however, during LTO if a
831 // program is defined in multiple CUs we could end up calling it out of
832 // beginModule as we walk the CUs.
834 CompileUnit *&CURef = SPMap[N];
840 if (!SP.isDefinition())
841 // This is a method declaration which will be handled while constructing
845 DIE *SubprogramDie = TheCU->getOrCreateSubprogramDIE(SP);
847 // Expose as a global name.
848 TheCU->addGlobalName(SP.getName(), SubprogramDie, resolve(SP.getContext()));
851 void DwarfDebug::constructImportedEntityDIE(CompileUnit *TheCU,
853 DIImportedEntity Module(N);
854 if (!Module.Verify())
856 if (DIE *D = TheCU->getOrCreateContextDIE(Module.getContext()))
857 constructImportedEntityDIE(TheCU, Module, D);
860 void DwarfDebug::constructImportedEntityDIE(CompileUnit *TheCU, const MDNode *N,
862 DIImportedEntity Module(N);
863 if (!Module.Verify())
865 return constructImportedEntityDIE(TheCU, Module, Context);
868 void DwarfDebug::constructImportedEntityDIE(CompileUnit *TheCU,
869 const DIImportedEntity &Module,
871 assert(Module.Verify() &&
872 "Use one of the MDNode * overloads to handle invalid metadata");
873 assert(Context && "Should always have a context for an imported_module");
874 DIE *IMDie = new DIE(Module.getTag());
875 TheCU->insertDIE(Module, IMDie);
877 DIDescriptor Entity = Module.getEntity();
878 if (Entity.isNameSpace())
879 EntityDie = TheCU->getOrCreateNameSpace(DINameSpace(Entity));
880 else if (Entity.isSubprogram())
881 EntityDie = TheCU->getOrCreateSubprogramDIE(DISubprogram(Entity));
882 else if (Entity.isType())
883 EntityDie = TheCU->getOrCreateTypeDIE(DIType(Entity));
885 EntityDie = TheCU->getDIE(Entity);
886 unsigned FileID = getOrCreateSourceID(Module.getContext().getFilename(),
887 Module.getContext().getDirectory(),
888 TheCU->getUniqueID());
889 TheCU->addUInt(IMDie, dwarf::DW_AT_decl_file, None, FileID);
890 TheCU->addUInt(IMDie, dwarf::DW_AT_decl_line, None, Module.getLineNumber());
891 TheCU->addDIEEntry(IMDie, dwarf::DW_AT_import, EntityDie);
892 StringRef Name = Module.getName();
894 TheCU->addString(IMDie, dwarf::DW_AT_name, Name);
895 Context->addChild(IMDie);
898 // Emit all Dwarf sections that should come prior to the content. Create
899 // global DIEs and emit initial debug info sections. This is invoked by
900 // the target AsmPrinter.
901 void DwarfDebug::beginModule() {
902 if (DisableDebugInfoPrinting)
905 const Module *M = MMI->getModule();
907 // If module has named metadata anchors then use them, otherwise scan the
908 // module using debug info finder to collect debug info.
909 NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
912 TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
914 // Emit initial sections so we can reference labels later.
917 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
918 DICompileUnit CUNode(CU_Nodes->getOperand(i));
919 CompileUnit *CU = constructCompileUnit(CUNode);
920 DIArray ImportedEntities = CUNode.getImportedEntities();
921 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
922 ScopesWithImportedEntities.push_back(std::make_pair(
923 DIImportedEntity(ImportedEntities.getElement(i)).getContext(),
924 ImportedEntities.getElement(i)));
925 std::sort(ScopesWithImportedEntities.begin(),
926 ScopesWithImportedEntities.end(), less_first());
927 DIArray GVs = CUNode.getGlobalVariables();
928 for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i)
929 CU->createGlobalVariableDIE(GVs.getElement(i));
930 DIArray SPs = CUNode.getSubprograms();
931 for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
932 constructSubprogramDIE(CU, SPs.getElement(i));
933 DIArray EnumTypes = CUNode.getEnumTypes();
934 for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i)
935 CU->getOrCreateTypeDIE(EnumTypes.getElement(i));
936 DIArray RetainedTypes = CUNode.getRetainedTypes();
937 for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i)
938 CU->getOrCreateTypeDIE(RetainedTypes.getElement(i));
939 // Emit imported_modules last so that the relevant context is already
941 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
942 constructImportedEntityDIE(CU, ImportedEntities.getElement(i));
945 // Tell MMI that we have debug info.
946 MMI->setDebugInfoAvailability(true);
948 // Prime section data.
949 SectionMap[Asm->getObjFileLowering().getTextSection()];
952 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
953 void DwarfDebug::computeInlinedDIEs() {
954 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
955 for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(),
956 AE = InlinedSubprogramDIEs.end(); AI != AE; ++AI) {
958 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
960 for (DenseMap<const MDNode *, DIE *>::iterator AI = AbstractSPDies.begin(),
961 AE = AbstractSPDies.end(); AI != AE; ++AI) {
962 DIE *ISP = AI->second;
963 if (InlinedSubprogramDIEs.count(ISP))
965 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
969 // Collect info for variables that were optimized out.
970 void DwarfDebug::collectDeadVariables() {
971 const Module *M = MMI->getModule();
973 if (NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu")) {
974 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
975 DICompileUnit TheCU(CU_Nodes->getOperand(i));
976 DIArray Subprograms = TheCU.getSubprograms();
977 for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
978 DISubprogram SP(Subprograms.getElement(i));
979 if (ProcessedSPNodes.count(SP) != 0)
981 if (!SP.isSubprogram())
983 if (!SP.isDefinition())
985 DIArray Variables = SP.getVariables();
986 if (Variables.getNumElements() == 0)
989 // Construct subprogram DIE and add variables DIEs.
990 CompileUnit *SPCU = CUMap.lookup(TheCU);
991 assert(SPCU && "Unable to find Compile Unit!");
992 // FIXME: See the comment in constructSubprogramDIE about duplicate
994 constructSubprogramDIE(SPCU, SP);
995 DIE *SPDIE = SPCU->getDIE(SP);
996 for (unsigned vi = 0, ve = Variables.getNumElements(); vi != ve; ++vi) {
997 DIVariable DV(Variables.getElement(vi));
998 if (!DV.isVariable())
1000 DbgVariable NewVar(DV, NULL, this);
1001 if (DIE *VariableDIE =
1002 SPCU->constructVariableDIE(&NewVar, false))
1003 SPDIE->addChild(VariableDIE);
1010 // Type Signature [7.27] and ODR Hash code.
1012 /// \brief Grabs the string in whichever attribute is passed in and returns
1013 /// a reference to it. Returns "" if the attribute doesn't exist.
1014 static StringRef getDIEStringAttr(DIE *Die, unsigned Attr) {
1015 DIEValue *V = Die->findAttribute(Attr);
1017 if (DIEString *S = dyn_cast_or_null<DIEString>(V))
1018 return S->getString();
1020 return StringRef("");
1023 /// Return true if the current DIE is contained within an anonymous namespace.
1024 static bool isContainedInAnonNamespace(DIE *Die) {
1025 DIE *Parent = Die->getParent();
1028 if (Parent->getTag() == dwarf::DW_TAG_namespace &&
1029 getDIEStringAttr(Parent, dwarf::DW_AT_name) == "")
1031 Parent = Parent->getParent();
1037 /// Test if the current CU language is C++ and that we have
1038 /// a named type that is not contained in an anonymous namespace.
1039 static bool shouldAddODRHash(CompileUnit *CU, DIE *Die) {
1040 return CU->getLanguage() == dwarf::DW_LANG_C_plus_plus &&
1041 getDIEStringAttr(Die, dwarf::DW_AT_name) != "" &&
1042 !isContainedInAnonNamespace(Die);
1045 void DwarfDebug::finalizeModuleInfo() {
1046 // Collect info for variables that were optimized out.
1047 collectDeadVariables();
1049 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
1050 computeInlinedDIEs();
1052 // Split out type units and conditionally add an ODR tag to the split
1054 // FIXME: Do type splitting.
1055 for (unsigned i = 0, e = TypeUnits.size(); i != e; ++i) {
1056 DIE *Die = TypeUnits[i];
1058 // If we've requested ODR hashes and it's applicable for an ODR hash then
1059 // add the ODR signature now.
1060 // FIXME: This should be added onto the type unit, not the type, but this
1061 // works as an intermediate stage.
1062 if (GenerateODRHash && shouldAddODRHash(CUMap.begin()->second, Die))
1063 CUMap.begin()->second->addUInt(Die, dwarf::DW_AT_GNU_odr_signature,
1064 dwarf::DW_FORM_data8,
1065 Hash.computeDIEODRSignature(*Die));
1068 // Handle anything that needs to be done on a per-cu basis.
1069 for (DenseMap<const MDNode *, CompileUnit *>::iterator CUI = CUMap.begin(),
1071 CUI != CUE; ++CUI) {
1072 CompileUnit *TheCU = CUI->second;
1073 // Emit DW_AT_containing_type attribute to connect types with their
1074 // vtable holding type.
1075 TheCU->constructContainingTypeDIEs();
1077 // If we're splitting the dwarf out now that we've got the entire
1078 // CU then construct a skeleton CU based upon it.
1079 if (useSplitDwarf()) {
1081 if (GenerateCUHash) {
1083 ID = CUHash.computeCUSignature(*TheCU->getCUDie());
1085 // This should be a unique identifier when we want to build .dwp files.
1086 TheCU->addUInt(TheCU->getCUDie(), dwarf::DW_AT_GNU_dwo_id,
1087 dwarf::DW_FORM_data8, ID);
1088 // Now construct the skeleton CU associated.
1089 CompileUnit *SkCU = constructSkeletonCU(TheCU);
1090 // This should be a unique identifier when we want to build .dwp files.
1091 SkCU->addUInt(SkCU->getCUDie(), dwarf::DW_AT_GNU_dwo_id,
1092 dwarf::DW_FORM_data8, ID);
1096 // Compute DIE offsets and sizes.
1097 InfoHolder.computeSizeAndOffsets();
1098 if (useSplitDwarf())
1099 SkeletonHolder.computeSizeAndOffsets();
1102 void DwarfDebug::endSections() {
1103 // Filter labels by section.
1104 for (size_t n = 0; n < ArangeLabels.size(); n++) {
1105 const SymbolCU &SCU = ArangeLabels[n];
1106 if (SCU.Sym->isInSection()) {
1107 // Make a note of this symbol and it's section.
1108 const MCSection *Section = &SCU.Sym->getSection();
1109 if (!Section->getKind().isMetadata())
1110 SectionMap[Section].push_back(SCU);
1112 // Some symbols (e.g. common/bss on mach-o) can have no section but still
1113 // appear in the output. This sucks as we rely on sections to build
1114 // arange spans. We can do it without, but it's icky.
1115 SectionMap[NULL].push_back(SCU);
1119 // Build a list of sections used.
1120 std::vector<const MCSection *> Sections;
1121 for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
1123 const MCSection *Section = it->first;
1124 Sections.push_back(Section);
1127 // Sort the sections into order.
1128 // This is only done to ensure consistent output order across different runs.
1129 std::sort(Sections.begin(), Sections.end(), SectionSort);
1131 // Add terminating symbols for each section.
1132 for (unsigned ID=0;ID<Sections.size();ID++) {
1133 const MCSection *Section = Sections[ID];
1134 MCSymbol *Sym = NULL;
1137 // We can't call MCSection::getLabelEndName, as it's only safe to do so
1138 // if we know the section name up-front. For user-created sections, the resulting
1139 // label may not be valid to use as a label. (section names can use a greater
1140 // set of characters on some systems)
1141 Sym = Asm->GetTempSymbol("debug_end", ID);
1142 Asm->OutStreamer.SwitchSection(Section);
1143 Asm->OutStreamer.EmitLabel(Sym);
1146 // Insert a final terminator.
1147 SectionMap[Section].push_back(SymbolCU(NULL, Sym));
1151 // Emit all Dwarf sections that should come after the content.
1152 void DwarfDebug::endModule() {
1154 if (!FirstCU) return;
1156 // End any existing sections.
1157 // TODO: Does this need to happen?
1160 // Finalize the debug info for the module.
1161 finalizeModuleInfo();
1163 if (!useSplitDwarf()) {
1166 // Emit all the DIEs into a debug info section.
1169 // Corresponding abbreviations into a abbrev section.
1170 emitAbbreviations();
1172 // Emit info into a debug loc section.
1175 // Emit info into a debug aranges section.
1178 // Emit info into a debug ranges section.
1181 // Emit info into a debug macinfo section.
1185 // TODO: Fill this in for separated debug sections and separate
1186 // out information into new sections.
1188 if (useSplitDwarf())
1191 // Emit the debug info section and compile units.
1195 // Corresponding abbreviations into a abbrev section.
1196 emitAbbreviations();
1197 emitDebugAbbrevDWO();
1199 // Emit info into a debug loc section.
1202 // Emit info into a debug aranges section.
1205 // Emit info into a debug ranges section.
1208 // Emit info into a debug macinfo section.
1211 // Emit DWO addresses.
1212 InfoHolder.emitAddresses(Asm->getObjFileLowering().getDwarfAddrSection());
1216 // Emit info into the dwarf accelerator table sections.
1217 if (useDwarfAccelTables()) {
1220 emitAccelNamespaces();
1224 // Emit the pubnames and pubtypes sections if requested.
1225 if (HasDwarfPubSections) {
1226 emitDebugPubNames(GenerateGnuPubSections);
1227 emitDebugPubTypes(GenerateGnuPubSections);
1232 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
1233 E = CUMap.end(); I != E; ++I)
1236 for (SmallVectorImpl<CompileUnit *>::iterator I = SkeletonCUs.begin(),
1237 E = SkeletonCUs.end(); I != E; ++I)
1240 // Reset these for the next Module if we have one.
1244 // Find abstract variable, if any, associated with Var.
1245 DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &DV,
1246 DebugLoc ScopeLoc) {
1247 LLVMContext &Ctx = DV->getContext();
1248 // More then one inlined variable corresponds to one abstract variable.
1249 DIVariable Var = cleanseInlinedVariable(DV, Ctx);
1250 DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var);
1252 return AbsDbgVariable;
1254 LexicalScope *Scope = LScopes.findAbstractScope(ScopeLoc.getScope(Ctx));
1258 AbsDbgVariable = new DbgVariable(Var, NULL, this);
1259 addScopeVariable(Scope, AbsDbgVariable);
1260 AbstractVariables[Var] = AbsDbgVariable;
1261 return AbsDbgVariable;
1264 // If Var is a current function argument then add it to CurrentFnArguments list.
1265 bool DwarfDebug::addCurrentFnArgument(const MachineFunction *MF,
1266 DbgVariable *Var, LexicalScope *Scope) {
1267 if (!LScopes.isCurrentFunctionScope(Scope))
1269 DIVariable DV = Var->getVariable();
1270 if (DV.getTag() != dwarf::DW_TAG_arg_variable)
1272 unsigned ArgNo = DV.getArgNumber();
1276 size_t Size = CurrentFnArguments.size();
1278 CurrentFnArguments.resize(MF->getFunction()->arg_size());
1279 // llvm::Function argument size is not good indicator of how many
1280 // arguments does the function have at source level.
1282 CurrentFnArguments.resize(ArgNo * 2);
1283 CurrentFnArguments[ArgNo - 1] = Var;
1287 // Collect variable information from side table maintained by MMI.
1289 DwarfDebug::collectVariableInfoFromMMITable(const MachineFunction *MF,
1290 SmallPtrSet<const MDNode *, 16> &Processed) {
1291 MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
1292 for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
1293 VE = VMap.end(); VI != VE; ++VI) {
1294 const MDNode *Var = VI->first;
1296 Processed.insert(Var);
1298 const std::pair<unsigned, DebugLoc> &VP = VI->second;
1300 LexicalScope *Scope = LScopes.findLexicalScope(VP.second);
1302 // If variable scope is not found then skip this variable.
1306 DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
1307 DbgVariable *RegVar = new DbgVariable(DV, AbsDbgVariable, this);
1308 RegVar->setFrameIndex(VP.first);
1309 if (!addCurrentFnArgument(MF, RegVar, Scope))
1310 addScopeVariable(Scope, RegVar);
1312 AbsDbgVariable->setFrameIndex(VP.first);
1316 // Return true if debug value, encoded by DBG_VALUE instruction, is in a
1318 static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
1319 assert(MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
1320 return MI->getNumOperands() == 3 &&
1321 MI->getOperand(0).isReg() && MI->getOperand(0).getReg() &&
1322 (MI->getOperand(1).isImm() ||
1323 (MI->getOperand(1).isReg() && MI->getOperand(1).getReg() == 0U));
1326 // Get .debug_loc entry for the instruction range starting at MI.
1327 static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
1328 const MCSymbol *FLabel,
1329 const MCSymbol *SLabel,
1330 const MachineInstr *MI) {
1331 const MDNode *Var = MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1333 assert(MI->getNumOperands() == 3);
1334 if (MI->getOperand(0).isReg()) {
1335 MachineLocation MLoc;
1336 // If the second operand is an immediate, this is a
1337 // register-indirect address.
1338 if (!MI->getOperand(1).isImm())
1339 MLoc.set(MI->getOperand(0).getReg());
1341 MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
1342 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1344 if (MI->getOperand(0).isImm())
1345 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getImm());
1346 if (MI->getOperand(0).isFPImm())
1347 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getFPImm());
1348 if (MI->getOperand(0).isCImm())
1349 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getCImm());
1351 llvm_unreachable("Unexpected 3 operand DBG_VALUE instruction!");
1354 // Find variables for each lexical scope.
1356 DwarfDebug::collectVariableInfo(const MachineFunction *MF,
1357 SmallPtrSet<const MDNode *, 16> &Processed) {
1359 // Grab the variable info that was squirreled away in the MMI side-table.
1360 collectVariableInfoFromMMITable(MF, Processed);
1362 for (SmallVectorImpl<const MDNode*>::const_iterator
1363 UVI = UserVariables.begin(), UVE = UserVariables.end(); UVI != UVE;
1365 const MDNode *Var = *UVI;
1366 if (Processed.count(Var))
1369 // History contains relevant DBG_VALUE instructions for Var and instructions
1371 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1372 if (History.empty())
1374 const MachineInstr *MInsn = History.front();
1377 LexicalScope *Scope = NULL;
1378 if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
1379 DISubprogram(DV.getContext()).describes(MF->getFunction()))
1380 Scope = LScopes.getCurrentFunctionScope();
1381 else if (MDNode *IA = DV.getInlinedAt())
1382 Scope = LScopes.findInlinedScope(DebugLoc::getFromDILocation(IA));
1384 Scope = LScopes.findLexicalScope(cast<MDNode>(DV->getOperand(1)));
1385 // If variable scope is not found then skip this variable.
1389 Processed.insert(DV);
1390 assert(MInsn->isDebugValue() && "History must begin with debug value");
1391 DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc());
1392 DbgVariable *RegVar = new DbgVariable(DV, AbsVar, this);
1393 if (!addCurrentFnArgument(MF, RegVar, Scope))
1394 addScopeVariable(Scope, RegVar);
1396 AbsVar->setMInsn(MInsn);
1398 // Simplify ranges that are fully coalesced.
1399 if (History.size() <= 1 || (History.size() == 2 &&
1400 MInsn->isIdenticalTo(History.back()))) {
1401 RegVar->setMInsn(MInsn);
1405 // Handle multiple DBG_VALUE instructions describing one variable.
1406 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1408 for (SmallVectorImpl<const MachineInstr*>::const_iterator
1409 HI = History.begin(), HE = History.end(); HI != HE; ++HI) {
1410 const MachineInstr *Begin = *HI;
1411 assert(Begin->isDebugValue() && "Invalid History entry");
1413 // Check if DBG_VALUE is truncating a range.
1414 if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg()
1415 && !Begin->getOperand(0).getReg())
1418 // Compute the range for a register location.
1419 const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
1420 const MCSymbol *SLabel = 0;
1423 // If Begin is the last instruction in History then its value is valid
1424 // until the end of the function.
1425 SLabel = FunctionEndSym;
1427 const MachineInstr *End = HI[1];
1428 DEBUG(dbgs() << "DotDebugLoc Pair:\n"
1429 << "\t" << *Begin << "\t" << *End << "\n");
1430 if (End->isDebugValue())
1431 SLabel = getLabelBeforeInsn(End);
1433 // End is a normal instruction clobbering the range.
1434 SLabel = getLabelAfterInsn(End);
1435 assert(SLabel && "Forgot label after clobber instruction");
1440 // The value is valid until the next DBG_VALUE or clobber.
1441 DotDebugLocEntries.push_back(getDebugLocEntry(Asm, FLabel, SLabel,
1444 DotDebugLocEntries.push_back(DotDebugLocEntry());
1447 // Collect info for variables that were optimized out.
1448 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1449 DIArray Variables = DISubprogram(FnScope->getScopeNode()).getVariables();
1450 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1451 DIVariable DV(Variables.getElement(i));
1452 if (!DV || !DV.isVariable() || !Processed.insert(DV))
1454 if (LexicalScope *Scope = LScopes.findLexicalScope(DV.getContext()))
1455 addScopeVariable(Scope, new DbgVariable(DV, NULL, this));
1459 // Return Label preceding the instruction.
1460 MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1461 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1462 assert(Label && "Didn't insert label before instruction");
1466 // Return Label immediately following the instruction.
1467 MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1468 return LabelsAfterInsn.lookup(MI);
1471 // Process beginning of an instruction.
1472 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1473 // Check if source location changes, but ignore DBG_VALUE locations.
1474 if (!MI->isDebugValue()) {
1475 DebugLoc DL = MI->getDebugLoc();
1476 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1479 if (DL == PrologEndLoc) {
1480 Flags |= DWARF2_FLAG_PROLOGUE_END;
1481 PrologEndLoc = DebugLoc();
1483 if (PrologEndLoc.isUnknown())
1484 Flags |= DWARF2_FLAG_IS_STMT;
1486 if (!DL.isUnknown()) {
1487 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1488 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1490 recordSourceLine(0, 0, 0, 0);
1494 // Insert labels where requested.
1495 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1496 LabelsBeforeInsn.find(MI);
1499 if (I == LabelsBeforeInsn.end())
1502 // Label already assigned.
1507 PrevLabel = MMI->getContext().CreateTempSymbol();
1508 Asm->OutStreamer.EmitLabel(PrevLabel);
1510 I->second = PrevLabel;
1513 // Process end of an instruction.
1514 void DwarfDebug::endInstruction(const MachineInstr *MI) {
1515 // Don't create a new label after DBG_VALUE instructions.
1516 // They don't generate code.
1517 if (!MI->isDebugValue())
1520 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1521 LabelsAfterInsn.find(MI);
1524 if (I == LabelsAfterInsn.end())
1527 // Label already assigned.
1531 // We need a label after this instruction.
1533 PrevLabel = MMI->getContext().CreateTempSymbol();
1534 Asm->OutStreamer.EmitLabel(PrevLabel);
1536 I->second = PrevLabel;
1539 // Each LexicalScope has first instruction and last instruction to mark
1540 // beginning and end of a scope respectively. Create an inverse map that list
1541 // scopes starts (and ends) with an instruction. One instruction may start (or
1542 // end) multiple scopes. Ignore scopes that are not reachable.
1543 void DwarfDebug::identifyScopeMarkers() {
1544 SmallVector<LexicalScope *, 4> WorkList;
1545 WorkList.push_back(LScopes.getCurrentFunctionScope());
1546 while (!WorkList.empty()) {
1547 LexicalScope *S = WorkList.pop_back_val();
1549 const SmallVectorImpl<LexicalScope *> &Children = S->getChildren();
1550 if (!Children.empty())
1551 for (SmallVectorImpl<LexicalScope *>::const_iterator SI = Children.begin(),
1552 SE = Children.end(); SI != SE; ++SI)
1553 WorkList.push_back(*SI);
1555 if (S->isAbstractScope())
1558 const SmallVectorImpl<InsnRange> &Ranges = S->getRanges();
1561 for (SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin(),
1562 RE = Ranges.end(); RI != RE; ++RI) {
1563 assert(RI->first && "InsnRange does not have first instruction!");
1564 assert(RI->second && "InsnRange does not have second instruction!");
1565 requestLabelBeforeInsn(RI->first);
1566 requestLabelAfterInsn(RI->second);
1571 // Get MDNode for DebugLoc's scope.
1572 static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
1573 if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
1574 return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
1575 return DL.getScope(Ctx);
1578 // Walk up the scope chain of given debug loc and find line number info
1579 // for the function.
1580 static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
1581 const MDNode *Scope = getScopeNode(DL, Ctx);
1582 DISubprogram SP = getDISubprogram(Scope);
1583 if (SP.isSubprogram()) {
1584 // Check for number of operands since the compatibility is
1586 if (SP->getNumOperands() > 19)
1587 return DebugLoc::get(SP.getScopeLineNumber(), 0, SP);
1589 return DebugLoc::get(SP.getLineNumber(), 0, SP);
1595 // Gather pre-function debug information. Assumes being called immediately
1596 // after the function entry point has been emitted.
1597 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1598 if (!MMI->hasDebugInfo()) return;
1599 LScopes.initialize(*MF);
1600 if (LScopes.empty()) return;
1601 identifyScopeMarkers();
1603 // Set DwarfCompileUnitID in MCContext to the Compile Unit this function
1605 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1606 CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1607 assert(TheCU && "Unable to find compile unit!");
1608 if (Asm->TM.hasMCUseLoc() && Asm->OutStreamer.hasRawTextSupport())
1609 // Use a single line table if we are using .loc and generating assembly.
1610 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1612 Asm->OutStreamer.getContext().setDwarfCompileUnitID(TheCU->getUniqueID());
1614 FunctionBeginSym = Asm->GetTempSymbol("func_begin",
1615 Asm->getFunctionNumber());
1616 // Assumes in correct section after the entry point.
1617 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1619 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
1621 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1622 // LiveUserVar - Map physreg numbers to the MDNode they contain.
1623 std::vector<const MDNode*> LiveUserVar(TRI->getNumRegs());
1625 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1627 bool AtBlockEntry = true;
1628 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1630 const MachineInstr *MI = II;
1632 if (MI->isDebugValue()) {
1633 assert(MI->getNumOperands() > 1 && "Invalid machine instruction!");
1635 // Keep track of user variables.
1637 MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1639 // Variable is in a register, we need to check for clobbers.
1640 if (isDbgValueInDefinedReg(MI))
1641 LiveUserVar[MI->getOperand(0).getReg()] = Var;
1643 // Check the history of this variable.
1644 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1645 if (History.empty()) {
1646 UserVariables.push_back(Var);
1647 // The first mention of a function argument gets the FunctionBeginSym
1648 // label, so arguments are visible when breaking at function entry.
1650 if (DV.isVariable() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
1651 DISubprogram(getDISubprogram(DV.getContext()))
1652 .describes(MF->getFunction()))
1653 LabelsBeforeInsn[MI] = FunctionBeginSym;
1655 // We have seen this variable before. Try to coalesce DBG_VALUEs.
1656 const MachineInstr *Prev = History.back();
1657 if (Prev->isDebugValue()) {
1658 // Coalesce identical entries at the end of History.
1659 if (History.size() >= 2 &&
1660 Prev->isIdenticalTo(History[History.size() - 2])) {
1661 DEBUG(dbgs() << "Coalescing identical DBG_VALUE entries:\n"
1663 << "\t" << *History[History.size() - 2] << "\n");
1667 // Terminate old register assignments that don't reach MI;
1668 MachineFunction::const_iterator PrevMBB = Prev->getParent();
1669 if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
1670 isDbgValueInDefinedReg(Prev)) {
1671 // Previous register assignment needs to terminate at the end of
1673 MachineBasicBlock::const_iterator LastMI =
1674 PrevMBB->getLastNonDebugInstr();
1675 if (LastMI == PrevMBB->end()) {
1676 // Drop DBG_VALUE for empty range.
1677 DEBUG(dbgs() << "Dropping DBG_VALUE for empty range:\n"
1678 << "\t" << *Prev << "\n");
1680 } else if (llvm::next(PrevMBB) != PrevMBB->getParent()->end())
1681 // Terminate after LastMI.
1682 History.push_back(LastMI);
1686 History.push_back(MI);
1688 // Not a DBG_VALUE instruction.
1690 AtBlockEntry = false;
1692 // First known non-DBG_VALUE and non-frame setup location marks
1693 // the beginning of the function body.
1694 if (!MI->getFlag(MachineInstr::FrameSetup) &&
1695 (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown()))
1696 PrologEndLoc = MI->getDebugLoc();
1698 // Check if the instruction clobbers any registers with debug vars.
1699 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
1700 MOE = MI->operands_end(); MOI != MOE; ++MOI) {
1701 if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
1703 for (MCRegAliasIterator AI(MOI->getReg(), TRI, true);
1704 AI.isValid(); ++AI) {
1706 const MDNode *Var = LiveUserVar[Reg];
1709 // Reg is now clobbered.
1710 LiveUserVar[Reg] = 0;
1712 // Was MD last defined by a DBG_VALUE referring to Reg?
1713 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
1714 if (HistI == DbgValues.end())
1716 SmallVectorImpl<const MachineInstr*> &History = HistI->second;
1717 if (History.empty())
1719 const MachineInstr *Prev = History.back();
1720 // Sanity-check: Register assignments are terminated at the end of
1722 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
1724 // Is the variable still in Reg?
1725 if (!isDbgValueInDefinedReg(Prev) ||
1726 Prev->getOperand(0).getReg() != Reg)
1728 // Var is clobbered. Make sure the next instruction gets a label.
1729 History.push_back(MI);
1736 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
1738 SmallVectorImpl<const MachineInstr*> &History = I->second;
1739 if (History.empty())
1742 // Make sure the final register assignments are terminated.
1743 const MachineInstr *Prev = History.back();
1744 if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
1745 const MachineBasicBlock *PrevMBB = Prev->getParent();
1746 MachineBasicBlock::const_iterator LastMI =
1747 PrevMBB->getLastNonDebugInstr();
1748 if (LastMI == PrevMBB->end())
1749 // Drop DBG_VALUE for empty range.
1751 else if (PrevMBB != &PrevMBB->getParent()->back()) {
1752 // Terminate after LastMI.
1753 History.push_back(LastMI);
1756 // Request labels for the full history.
1757 for (unsigned i = 0, e = History.size(); i != e; ++i) {
1758 const MachineInstr *MI = History[i];
1759 if (MI->isDebugValue())
1760 requestLabelBeforeInsn(MI);
1762 requestLabelAfterInsn(MI);
1766 PrevInstLoc = DebugLoc();
1767 PrevLabel = FunctionBeginSym;
1769 // Record beginning of function.
1770 if (!PrologEndLoc.isUnknown()) {
1771 DebugLoc FnStartDL = getFnDebugLoc(PrologEndLoc,
1772 MF->getFunction()->getContext());
1773 recordSourceLine(FnStartDL.getLine(), FnStartDL.getCol(),
1774 FnStartDL.getScope(MF->getFunction()->getContext()),
1775 // We'd like to list the prologue as "not statements" but GDB behaves
1776 // poorly if we do that. Revisit this with caution/GDB (7.5+) testing.
1777 DWARF2_FLAG_IS_STMT);
1781 void DwarfDebug::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
1782 SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
1783 DIVariable DV = Var->getVariable();
1784 // Variables with positive arg numbers are parameters.
1785 if (unsigned ArgNum = DV.getArgNumber()) {
1786 // Keep all parameters in order at the start of the variable list to ensure
1787 // function types are correct (no out-of-order parameters)
1789 // This could be improved by only doing it for optimized builds (unoptimized
1790 // builds have the right order to begin with), searching from the back (this
1791 // would catch the unoptimized case quickly), or doing a binary search
1792 // rather than linear search.
1793 SmallVectorImpl<DbgVariable *>::iterator I = Vars.begin();
1794 while (I != Vars.end()) {
1795 unsigned CurNum = (*I)->getVariable().getArgNumber();
1796 // A local (non-parameter) variable has been found, insert immediately
1800 // A later indexed parameter has been found, insert immediately before it.
1801 if (CurNum > ArgNum)
1805 Vars.insert(I, Var);
1809 Vars.push_back(Var);
1812 // Gather and emit post-function debug information.
1813 void DwarfDebug::endFunction(const MachineFunction *MF) {
1814 if (!MMI->hasDebugInfo() || LScopes.empty()) return;
1816 // Define end label for subprogram.
1817 FunctionEndSym = Asm->GetTempSymbol("func_end",
1818 Asm->getFunctionNumber());
1819 // Assumes in correct section after the entry point.
1820 Asm->OutStreamer.EmitLabel(FunctionEndSym);
1821 // Set DwarfCompileUnitID in MCContext to default value.
1822 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1824 SmallPtrSet<const MDNode *, 16> ProcessedVars;
1825 collectVariableInfo(MF, ProcessedVars);
1827 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1828 CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1829 assert(TheCU && "Unable to find compile unit!");
1831 // Construct abstract scopes.
1832 ArrayRef<LexicalScope *> AList = LScopes.getAbstractScopesList();
1833 for (unsigned i = 0, e = AList.size(); i != e; ++i) {
1834 LexicalScope *AScope = AList[i];
1835 DISubprogram SP(AScope->getScopeNode());
1836 if (SP.isSubprogram()) {
1837 // Collect info for variables that were optimized out.
1838 DIArray Variables = SP.getVariables();
1839 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1840 DIVariable DV(Variables.getElement(i));
1841 if (!DV || !DV.isVariable() || !ProcessedVars.insert(DV))
1843 // Check that DbgVariable for DV wasn't created earlier, when
1844 // findAbstractVariable() was called for inlined instance of DV.
1845 LLVMContext &Ctx = DV->getContext();
1846 DIVariable CleanDV = cleanseInlinedVariable(DV, Ctx);
1847 if (AbstractVariables.lookup(CleanDV))
1849 if (LexicalScope *Scope = LScopes.findAbstractScope(DV.getContext()))
1850 addScopeVariable(Scope, new DbgVariable(DV, NULL, this));
1853 if (ProcessedSPNodes.count(AScope->getScopeNode()) == 0)
1854 constructScopeDIE(TheCU, AScope);
1857 DIE *CurFnDIE = constructScopeDIE(TheCU, FnScope);
1859 if (!MF->getTarget().Options.DisableFramePointerElim(*MF))
1860 TheCU->addFlag(CurFnDIE, dwarf::DW_AT_APPLE_omit_frame_ptr);
1863 for (ScopeVariablesMap::iterator
1864 I = ScopeVariables.begin(), E = ScopeVariables.end(); I != E; ++I)
1865 DeleteContainerPointers(I->second);
1866 ScopeVariables.clear();
1867 DeleteContainerPointers(CurrentFnArguments);
1868 UserVariables.clear();
1870 AbstractVariables.clear();
1871 LabelsBeforeInsn.clear();
1872 LabelsAfterInsn.clear();
1876 // Register a source line with debug info. Returns the unique label that was
1877 // emitted and which provides correspondence to the source line list.
1878 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
1884 DIDescriptor Scope(S);
1886 if (Scope.isCompileUnit()) {
1887 DICompileUnit CU(S);
1888 Fn = CU.getFilename();
1889 Dir = CU.getDirectory();
1890 } else if (Scope.isFile()) {
1892 Fn = F.getFilename();
1893 Dir = F.getDirectory();
1894 } else if (Scope.isSubprogram()) {
1896 Fn = SP.getFilename();
1897 Dir = SP.getDirectory();
1898 } else if (Scope.isLexicalBlockFile()) {
1899 DILexicalBlockFile DBF(S);
1900 Fn = DBF.getFilename();
1901 Dir = DBF.getDirectory();
1902 } else if (Scope.isLexicalBlock()) {
1903 DILexicalBlock DB(S);
1904 Fn = DB.getFilename();
1905 Dir = DB.getDirectory();
1907 llvm_unreachable("Unexpected scope info");
1909 Src = getOrCreateSourceID(Fn, Dir,
1910 Asm->OutStreamer.getContext().getDwarfCompileUnitID());
1912 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0, 0, Fn);
1915 //===----------------------------------------------------------------------===//
1917 //===----------------------------------------------------------------------===//
1919 // Compute the size and offset of a DIE. The offset is relative to start of the
1920 // CU. It returns the offset after laying out the DIE.
1922 DwarfUnits::computeSizeAndOffset(DIE *Die, unsigned Offset) {
1923 // Get the children.
1924 const std::vector<DIE *> &Children = Die->getChildren();
1926 // Record the abbreviation.
1927 assignAbbrevNumber(Die->getAbbrev());
1929 // Get the abbreviation for this DIE.
1930 unsigned AbbrevNumber = Die->getAbbrevNumber();
1931 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
1934 Die->setOffset(Offset);
1936 // Start the size with the size of abbreviation code.
1937 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
1939 const SmallVectorImpl<DIEValue*> &Values = Die->getValues();
1940 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev->getData();
1942 // Size the DIE attribute values.
1943 for (unsigned i = 0, N = Values.size(); i < N; ++i)
1944 // Size attribute value.
1945 Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
1947 // Size the DIE children if any.
1948 if (!Children.empty()) {
1949 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
1950 "Children flag not set");
1952 for (unsigned j = 0, M = Children.size(); j < M; ++j)
1953 Offset = computeSizeAndOffset(Children[j], Offset);
1955 // End of children marker.
1956 Offset += sizeof(int8_t);
1959 Die->setSize(Offset - Die->getOffset());
1963 // Compute the size and offset for each DIE.
1964 void DwarfUnits::computeSizeAndOffsets() {
1965 // Offset from the first CU in the debug info section is 0 initially.
1966 unsigned SecOffset = 0;
1968 // Iterate over each compile unit and set the size and offsets for each
1969 // DIE within each compile unit. All offsets are CU relative.
1970 for (SmallVectorImpl<CompileUnit *>::iterator I = CUs.begin(),
1971 E = CUs.end(); I != E; ++I) {
1972 (*I)->setDebugInfoOffset(SecOffset);
1974 // CU-relative offset is reset to 0 here.
1975 unsigned Offset = sizeof(int32_t) + // Length of Unit Info
1976 (*I)->getHeaderSize(); // Unit-specific headers
1978 // EndOffset here is CU-relative, after laying out
1979 // all of the CU DIE.
1980 unsigned EndOffset = computeSizeAndOffset((*I)->getCUDie(), Offset);
1981 SecOffset += EndOffset;
1985 // Emit initial Dwarf sections with a label at the start of each one.
1986 void DwarfDebug::emitSectionLabels() {
1987 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1989 // Dwarf sections base addresses.
1990 DwarfInfoSectionSym =
1991 emitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
1992 DwarfAbbrevSectionSym =
1993 emitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
1994 if (useSplitDwarf())
1995 DwarfAbbrevDWOSectionSym =
1996 emitSectionSym(Asm, TLOF.getDwarfAbbrevDWOSection(),
1997 "section_abbrev_dwo");
1998 emitSectionSym(Asm, TLOF.getDwarfARangesSection());
2000 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
2001 emitSectionSym(Asm, MacroInfo);
2003 DwarfLineSectionSym =
2004 emitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
2005 emitSectionSym(Asm, TLOF.getDwarfLocSection());
2006 if (GenerateGnuPubSections) {
2007 DwarfGnuPubNamesSectionSym =
2008 emitSectionSym(Asm, TLOF.getDwarfGnuPubNamesSection());
2009 DwarfGnuPubTypesSectionSym =
2010 emitSectionSym(Asm, TLOF.getDwarfGnuPubTypesSection());
2011 } else if (HasDwarfPubSections) {
2012 emitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
2013 emitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
2016 DwarfStrSectionSym =
2017 emitSectionSym(Asm, TLOF.getDwarfStrSection(), "info_string");
2018 if (useSplitDwarf()) {
2019 DwarfStrDWOSectionSym =
2020 emitSectionSym(Asm, TLOF.getDwarfStrDWOSection(), "skel_string");
2021 DwarfAddrSectionSym =
2022 emitSectionSym(Asm, TLOF.getDwarfAddrSection(), "addr_sec");
2024 DwarfDebugRangeSectionSym = emitSectionSym(Asm, TLOF.getDwarfRangesSection(),
2027 DwarfDebugLocSectionSym = emitSectionSym(Asm, TLOF.getDwarfLocSection(),
2028 "section_debug_loc");
2030 TextSectionSym = emitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
2031 emitSectionSym(Asm, TLOF.getDataSection());
2034 // Recursively emits a debug information entry.
2035 void DwarfDebug::emitDIE(DIE *Die, ArrayRef<DIEAbbrev *> Abbrevs) {
2036 // Get the abbreviation for this DIE.
2037 unsigned AbbrevNumber = Die->getAbbrevNumber();
2038 const DIEAbbrev *Abbrev = Abbrevs[AbbrevNumber - 1];
2040 // Emit the code (index) for the abbreviation.
2041 if (Asm->isVerbose())
2042 Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
2043 Twine::utohexstr(Die->getOffset()) + ":0x" +
2044 Twine::utohexstr(Die->getSize()) + " " +
2045 dwarf::TagString(Abbrev->getTag()));
2046 Asm->EmitULEB128(AbbrevNumber);
2048 const SmallVectorImpl<DIEValue*> &Values = Die->getValues();
2049 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev->getData();
2051 // Emit the DIE attribute values.
2052 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2053 dwarf::Attribute Attr = AbbrevData[i].getAttribute();
2054 dwarf::Form Form = AbbrevData[i].getForm();
2055 assert(Form && "Too many attributes for DIE (check abbreviation)");
2057 if (Asm->isVerbose())
2058 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
2061 case dwarf::DW_AT_abstract_origin:
2062 case dwarf::DW_AT_type:
2063 case dwarf::DW_AT_friend:
2064 case dwarf::DW_AT_specification:
2065 case dwarf::DW_AT_import:
2066 case dwarf::DW_AT_containing_type: {
2067 DIEEntry *E = cast<DIEEntry>(Values[i]);
2068 DIE *Origin = E->getEntry();
2069 unsigned Addr = Origin->getOffset();
2070 if (Form == dwarf::DW_FORM_ref_addr) {
2071 assert(!useSplitDwarf() && "TODO: dwo files can't have relocations.");
2072 // For DW_FORM_ref_addr, output the offset from beginning of debug info
2073 // section. Origin->getOffset() returns the offset from start of the
2075 CompileUnit *CU = CUDieMap.lookup(Origin->getCompileUnit());
2076 assert(CU && "CUDie should belong to a CU.");
2077 Addr += CU->getDebugInfoOffset();
2078 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2079 Asm->EmitLabelPlusOffset(DwarfInfoSectionSym, Addr,
2080 DIEEntry::getRefAddrSize(Asm));
2082 Asm->EmitLabelOffsetDifference(DwarfInfoSectionSym, Addr,
2083 DwarfInfoSectionSym,
2084 DIEEntry::getRefAddrSize(Asm));
2086 Asm->EmitInt32(Addr);
2090 case dwarf::DW_AT_ranges: {
2091 // DW_AT_range Value encodes offset in debug_range section.
2092 DIEInteger *V = cast<DIEInteger>(Values[i]);
2094 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections()) {
2095 Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym,
2099 Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
2101 DwarfDebugRangeSectionSym,
2106 case dwarf::DW_AT_location: {
2107 if (DIELabel *L = dyn_cast<DIELabel>(Values[i])) {
2108 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2109 Asm->EmitLabelReference(L->getValue(), 4);
2111 Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
2113 Values[i]->EmitValue(Asm, Form);
2117 case dwarf::DW_AT_accessibility: {
2118 if (Asm->isVerbose()) {
2119 DIEInteger *V = cast<DIEInteger>(Values[i]);
2120 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
2122 Values[i]->EmitValue(Asm, Form);
2126 // Emit an attribute using the defined form.
2127 Values[i]->EmitValue(Asm, Form);
2132 // Emit the DIE children if any.
2133 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
2134 const std::vector<DIE *> &Children = Die->getChildren();
2136 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2137 emitDIE(Children[j], Abbrevs);
2139 if (Asm->isVerbose())
2140 Asm->OutStreamer.AddComment("End Of Children Mark");
2145 // Emit the various dwarf units to the unit section USection with
2146 // the abbreviations going into ASection.
2147 void DwarfUnits::emitUnits(DwarfDebug *DD,
2148 const MCSection *USection,
2149 const MCSection *ASection,
2150 const MCSymbol *ASectionSym) {
2151 Asm->OutStreamer.SwitchSection(USection);
2152 for (SmallVectorImpl<CompileUnit *>::iterator I = CUs.begin(),
2153 E = CUs.end(); I != E; ++I) {
2154 CompileUnit *TheCU = *I;
2155 DIE *Die = TheCU->getCUDie();
2157 // Emit the compile units header.
2159 .EmitLabel(Asm->GetTempSymbol(USection->getLabelBeginName(),
2160 TheCU->getUniqueID()));
2162 // Emit size of content not including length itself
2163 Asm->OutStreamer.AddComment("Length of Unit");
2164 Asm->EmitInt32(TheCU->getHeaderSize() + Die->getSize());
2166 TheCU->emitHeader(ASection, ASectionSym);
2168 DD->emitDIE(Die, Abbreviations);
2169 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol(USection->getLabelEndName(),
2170 TheCU->getUniqueID()));
2174 // Emit the debug info section.
2175 void DwarfDebug::emitDebugInfo() {
2176 DwarfUnits &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2178 Holder.emitUnits(this, Asm->getObjFileLowering().getDwarfInfoSection(),
2179 Asm->getObjFileLowering().getDwarfAbbrevSection(),
2180 DwarfAbbrevSectionSym);
2183 // Emit the abbreviation section.
2184 void DwarfDebug::emitAbbreviations() {
2185 if (!useSplitDwarf())
2186 emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection(),
2189 emitSkeletonAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection());
2192 void DwarfDebug::emitAbbrevs(const MCSection *Section,
2193 std::vector<DIEAbbrev *> *Abbrevs) {
2194 // Check to see if it is worth the effort.
2195 if (!Abbrevs->empty()) {
2196 // Start the debug abbrev section.
2197 Asm->OutStreamer.SwitchSection(Section);
2199 MCSymbol *Begin = Asm->GetTempSymbol(Section->getLabelBeginName());
2200 Asm->OutStreamer.EmitLabel(Begin);
2202 // For each abbrevation.
2203 for (unsigned i = 0, N = Abbrevs->size(); i < N; ++i) {
2204 // Get abbreviation data
2205 const DIEAbbrev *Abbrev = Abbrevs->at(i);
2207 // Emit the abbrevations code (base 1 index.)
2208 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
2210 // Emit the abbreviations data.
2214 // Mark end of abbreviations.
2215 Asm->EmitULEB128(0, "EOM(3)");
2217 MCSymbol *End = Asm->GetTempSymbol(Section->getLabelEndName());
2218 Asm->OutStreamer.EmitLabel(End);
2222 // Emit the last address of the section and the end of the line matrix.
2223 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
2224 // Define last address of section.
2225 Asm->OutStreamer.AddComment("Extended Op");
2228 Asm->OutStreamer.AddComment("Op size");
2229 Asm->EmitInt8(Asm->getDataLayout().getPointerSize() + 1);
2230 Asm->OutStreamer.AddComment("DW_LNE_set_address");
2231 Asm->EmitInt8(dwarf::DW_LNE_set_address);
2233 Asm->OutStreamer.AddComment("Section end label");
2235 Asm->OutStreamer.EmitSymbolValue(Asm->GetTempSymbol("section_end",SectionEnd),
2236 Asm->getDataLayout().getPointerSize());
2238 // Mark end of matrix.
2239 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
2245 // Emit visible names into a hashed accelerator table section.
2246 void DwarfDebug::emitAccelNames() {
2247 DwarfAccelTable AT(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2248 dwarf::DW_FORM_data4));
2249 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2250 E = CUMap.end(); I != E; ++I) {
2251 CompileUnit *TheCU = I->second;
2252 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelNames();
2253 for (StringMap<std::vector<DIE*> >::const_iterator
2254 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2255 StringRef Name = GI->getKey();
2256 const std::vector<DIE *> &Entities = GI->second;
2257 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
2258 DE = Entities.end(); DI != DE; ++DI)
2259 AT.AddName(Name, (*DI));
2263 AT.FinalizeTable(Asm, "Names");
2264 Asm->OutStreamer.SwitchSection(
2265 Asm->getObjFileLowering().getDwarfAccelNamesSection());
2266 MCSymbol *SectionBegin = Asm->GetTempSymbol("names_begin");
2267 Asm->OutStreamer.EmitLabel(SectionBegin);
2269 // Emit the full data.
2270 AT.Emit(Asm, SectionBegin, &InfoHolder);
2273 // Emit objective C classes and categories into a hashed accelerator table
2275 void DwarfDebug::emitAccelObjC() {
2276 DwarfAccelTable AT(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2277 dwarf::DW_FORM_data4));
2278 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2279 E = CUMap.end(); I != E; ++I) {
2280 CompileUnit *TheCU = I->second;
2281 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelObjC();
2282 for (StringMap<std::vector<DIE*> >::const_iterator
2283 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2284 StringRef Name = GI->getKey();
2285 const std::vector<DIE *> &Entities = GI->second;
2286 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
2287 DE = Entities.end(); DI != DE; ++DI)
2288 AT.AddName(Name, (*DI));
2292 AT.FinalizeTable(Asm, "ObjC");
2293 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
2294 .getDwarfAccelObjCSection());
2295 MCSymbol *SectionBegin = Asm->GetTempSymbol("objc_begin");
2296 Asm->OutStreamer.EmitLabel(SectionBegin);
2298 // Emit the full data.
2299 AT.Emit(Asm, SectionBegin, &InfoHolder);
2302 // Emit namespace dies into a hashed accelerator table.
2303 void DwarfDebug::emitAccelNamespaces() {
2304 DwarfAccelTable AT(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2305 dwarf::DW_FORM_data4));
2306 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2307 E = CUMap.end(); I != E; ++I) {
2308 CompileUnit *TheCU = I->second;
2309 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelNamespace();
2310 for (StringMap<std::vector<DIE*> >::const_iterator
2311 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2312 StringRef Name = GI->getKey();
2313 const std::vector<DIE *> &Entities = GI->second;
2314 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
2315 DE = Entities.end(); DI != DE; ++DI)
2316 AT.AddName(Name, (*DI));
2320 AT.FinalizeTable(Asm, "namespac");
2321 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
2322 .getDwarfAccelNamespaceSection());
2323 MCSymbol *SectionBegin = Asm->GetTempSymbol("namespac_begin");
2324 Asm->OutStreamer.EmitLabel(SectionBegin);
2326 // Emit the full data.
2327 AT.Emit(Asm, SectionBegin, &InfoHolder);
2330 // Emit type dies into a hashed accelerator table.
2331 void DwarfDebug::emitAccelTypes() {
2332 std::vector<DwarfAccelTable::Atom> Atoms;
2333 Atoms.push_back(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2334 dwarf::DW_FORM_data4));
2335 Atoms.push_back(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_tag,
2336 dwarf::DW_FORM_data2));
2337 Atoms.push_back(DwarfAccelTable::Atom(dwarf::DW_ATOM_type_flags,
2338 dwarf::DW_FORM_data1));
2339 DwarfAccelTable AT(Atoms);
2340 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2341 E = CUMap.end(); I != E; ++I) {
2342 CompileUnit *TheCU = I->second;
2343 const StringMap<std::vector<std::pair<DIE*, unsigned > > > &Names
2344 = TheCU->getAccelTypes();
2345 for (StringMap<std::vector<std::pair<DIE*, unsigned> > >::const_iterator
2346 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2347 StringRef Name = GI->getKey();
2348 const std::vector<std::pair<DIE *, unsigned> > &Entities = GI->second;
2349 for (std::vector<std::pair<DIE *, unsigned> >::const_iterator DI
2350 = Entities.begin(), DE = Entities.end(); DI !=DE; ++DI)
2351 AT.AddName(Name, (*DI).first, (*DI).second);
2355 AT.FinalizeTable(Asm, "types");
2356 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
2357 .getDwarfAccelTypesSection());
2358 MCSymbol *SectionBegin = Asm->GetTempSymbol("types_begin");
2359 Asm->OutStreamer.EmitLabel(SectionBegin);
2361 // Emit the full data.
2362 AT.Emit(Asm, SectionBegin, &InfoHolder);
2365 // Public name handling.
2366 // The format for the various pubnames:
2368 // dwarf pubnames - offset/name pairs where the offset is the offset into the CU
2369 // for the DIE that is named.
2371 // gnu pubnames - offset/index value/name tuples where the offset is the offset
2372 // into the CU and the index value is computed according to the type of value
2373 // for the DIE that is named.
2375 // For type units the offset is the offset of the skeleton DIE. For split dwarf
2376 // it's the offset within the debug_info/debug_types dwo section, however, the
2377 // reference in the pubname header doesn't change.
2379 /// computeIndexValue - Compute the gdb index value for the DIE and CU.
2380 static dwarf::PubIndexEntryDescriptor computeIndexValue(CompileUnit *CU,
2382 dwarf::GDBIndexEntryLinkage Linkage = dwarf::GIEL_STATIC;
2384 // We could have a specification DIE that has our most of our knowledge,
2385 // look for that now.
2386 DIEValue *SpecVal = Die->findAttribute(dwarf::DW_AT_specification);
2388 DIE *SpecDIE = cast<DIEEntry>(SpecVal)->getEntry();
2389 if (SpecDIE->findAttribute(dwarf::DW_AT_external))
2390 Linkage = dwarf::GIEL_EXTERNAL;
2391 } else if (Die->findAttribute(dwarf::DW_AT_external))
2392 Linkage = dwarf::GIEL_EXTERNAL;
2394 switch (Die->getTag()) {
2395 case dwarf::DW_TAG_class_type:
2396 case dwarf::DW_TAG_structure_type:
2397 case dwarf::DW_TAG_union_type:
2398 case dwarf::DW_TAG_enumeration_type:
2399 return dwarf::PubIndexEntryDescriptor(
2400 dwarf::GIEK_TYPE, CU->getLanguage() != dwarf::DW_LANG_C_plus_plus
2401 ? dwarf::GIEL_STATIC
2402 : dwarf::GIEL_EXTERNAL);
2403 case dwarf::DW_TAG_typedef:
2404 case dwarf::DW_TAG_base_type:
2405 case dwarf::DW_TAG_subrange_type:
2406 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_TYPE, dwarf::GIEL_STATIC);
2407 case dwarf::DW_TAG_namespace:
2408 return dwarf::GIEK_TYPE;
2409 case dwarf::DW_TAG_subprogram:
2410 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_FUNCTION, Linkage);
2411 case dwarf::DW_TAG_constant:
2412 case dwarf::DW_TAG_variable:
2413 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE, Linkage);
2414 case dwarf::DW_TAG_enumerator:
2415 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE,
2416 dwarf::GIEL_STATIC);
2418 return dwarf::GIEK_NONE;
2422 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
2424 void DwarfDebug::emitDebugPubNames(bool GnuStyle) {
2425 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2426 const MCSection *PSec =
2427 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubNamesSection()
2428 : Asm->getObjFileLowering().getDwarfPubNamesSection();
2430 typedef DenseMap<const MDNode*, CompileUnit*> CUMapType;
2431 for (CUMapType::iterator I = CUMap.begin(), E = CUMap.end(); I != E; ++I) {
2432 CompileUnit *TheCU = I->second;
2433 unsigned ID = TheCU->getUniqueID();
2435 // Start the dwarf pubnames section.
2436 Asm->OutStreamer.SwitchSection(PSec);
2438 // Emit a label so we can reference the beginning of this pubname section.
2440 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("gnu_pubnames",
2441 TheCU->getUniqueID()));
2444 Asm->OutStreamer.AddComment("Length of Public Names Info");
2445 Asm->EmitLabelDifference(Asm->GetTempSymbol("pubnames_end", ID),
2446 Asm->GetTempSymbol("pubnames_begin", ID), 4);
2448 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin", ID));
2450 Asm->OutStreamer.AddComment("DWARF Version");
2451 Asm->EmitInt16(dwarf::DW_PUBNAMES_VERSION);
2453 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2454 Asm->EmitSectionOffset(Asm->GetTempSymbol(ISec->getLabelBeginName(), ID),
2455 DwarfInfoSectionSym);
2457 Asm->OutStreamer.AddComment("Compilation Unit Length");
2458 Asm->EmitLabelDifference(Asm->GetTempSymbol(ISec->getLabelEndName(), ID),
2459 Asm->GetTempSymbol(ISec->getLabelBeginName(), ID),
2462 // Emit the pubnames for this compilation unit.
2463 const StringMap<DIE*> &Globals = TheCU->getGlobalNames();
2464 for (StringMap<DIE*>::const_iterator
2465 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2466 const char *Name = GI->getKeyData();
2467 DIE *Entity = GI->second;
2469 Asm->OutStreamer.AddComment("DIE offset");
2470 Asm->EmitInt32(Entity->getOffset());
2473 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheCU, Entity);
2474 Asm->OutStreamer.AddComment(
2475 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
2476 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
2477 Asm->EmitInt8(Desc.toBits());
2480 if (Asm->isVerbose())
2481 Asm->OutStreamer.AddComment("External Name");
2482 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1));
2485 Asm->OutStreamer.AddComment("End Mark");
2487 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_end", ID));
2491 void DwarfDebug::emitDebugPubTypes(bool GnuStyle) {
2492 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2493 const MCSection *PSec =
2494 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubTypesSection()
2495 : Asm->getObjFileLowering().getDwarfPubTypesSection();
2497 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2500 CompileUnit *TheCU = I->second;
2501 // Start the dwarf pubtypes section.
2502 Asm->OutStreamer.SwitchSection(PSec);
2504 // Emit a label so we can reference the beginning of this pubtype section.
2506 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("gnu_pubtypes",
2507 TheCU->getUniqueID()));
2510 Asm->OutStreamer.AddComment("Length of Public Types Info");
2511 Asm->EmitLabelDifference(
2512 Asm->GetTempSymbol("pubtypes_end", TheCU->getUniqueID()),
2513 Asm->GetTempSymbol("pubtypes_begin", TheCU->getUniqueID()), 4);
2515 Asm->OutStreamer.EmitLabel(
2516 Asm->GetTempSymbol("pubtypes_begin", TheCU->getUniqueID()));
2518 if (Asm->isVerbose())
2519 Asm->OutStreamer.AddComment("DWARF Version");
2520 Asm->EmitInt16(dwarf::DW_PUBTYPES_VERSION);
2522 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2523 Asm->EmitSectionOffset(
2524 Asm->GetTempSymbol(ISec->getLabelBeginName(), TheCU->getUniqueID()),
2525 DwarfInfoSectionSym);
2527 Asm->OutStreamer.AddComment("Compilation Unit Length");
2528 Asm->EmitLabelDifference(
2529 Asm->GetTempSymbol(ISec->getLabelEndName(), TheCU->getUniqueID()),
2530 Asm->GetTempSymbol(ISec->getLabelBeginName(), TheCU->getUniqueID()), 4);
2532 // Emit the pubtypes.
2533 const StringMap<DIE *> &Globals = TheCU->getGlobalTypes();
2534 for (StringMap<DIE *>::const_iterator GI = Globals.begin(),
2537 const char *Name = GI->getKeyData();
2538 DIE *Entity = GI->second;
2540 if (Asm->isVerbose())
2541 Asm->OutStreamer.AddComment("DIE offset");
2542 Asm->EmitInt32(Entity->getOffset());
2545 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheCU, Entity);
2546 Asm->OutStreamer.AddComment(
2547 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
2548 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
2549 Asm->EmitInt8(Desc.toBits());
2552 if (Asm->isVerbose())
2553 Asm->OutStreamer.AddComment("External Name");
2555 // Emit the name with a terminating null byte.
2556 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength() + 1));
2559 Asm->OutStreamer.AddComment("End Mark");
2561 Asm->OutStreamer.EmitLabel(
2562 Asm->GetTempSymbol("pubtypes_end", TheCU->getUniqueID()));
2566 // Emit strings into a string section.
2567 void DwarfUnits::emitStrings(const MCSection *StrSection,
2568 const MCSection *OffsetSection = NULL,
2569 const MCSymbol *StrSecSym = NULL) {
2571 if (StringPool.empty()) return;
2573 // Start the dwarf str section.
2574 Asm->OutStreamer.SwitchSection(StrSection);
2576 // Get all of the string pool entries and put them in an array by their ID so
2577 // we can sort them.
2578 SmallVector<std::pair<unsigned,
2579 StringMapEntry<std::pair<MCSymbol*, unsigned> >*>, 64> Entries;
2581 for (StringMap<std::pair<MCSymbol*, unsigned> >::iterator
2582 I = StringPool.begin(), E = StringPool.end();
2584 Entries.push_back(std::make_pair(I->second.second, &*I));
2586 array_pod_sort(Entries.begin(), Entries.end());
2588 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2589 // Emit a label for reference from debug information entries.
2590 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
2592 // Emit the string itself with a terminating null byte.
2593 Asm->OutStreamer.EmitBytes(StringRef(Entries[i].second->getKeyData(),
2594 Entries[i].second->getKeyLength()+1));
2597 // If we've got an offset section go ahead and emit that now as well.
2598 if (OffsetSection) {
2599 Asm->OutStreamer.SwitchSection(OffsetSection);
2600 unsigned offset = 0;
2601 unsigned size = 4; // FIXME: DWARF64 is 8.
2602 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2603 Asm->OutStreamer.EmitIntValue(offset, size);
2604 offset += Entries[i].second->getKeyLength() + 1;
2609 // Emit strings into a string section.
2610 void DwarfUnits::emitAddresses(const MCSection *AddrSection) {
2612 if (AddressPool.empty()) return;
2614 // Start the dwarf addr section.
2615 Asm->OutStreamer.SwitchSection(AddrSection);
2617 // Order the address pool entries by ID
2618 SmallVector<const MCExpr *, 64> Entries(AddressPool.size());
2620 for (DenseMap<const MCExpr *, unsigned>::iterator I = AddressPool.begin(),
2621 E = AddressPool.end();
2623 Entries[I->second] = I->first;
2625 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2626 // Emit an expression for reference from debug information entries.
2627 if (const MCExpr *Expr = Entries[i])
2628 Asm->OutStreamer.EmitValue(Expr, Asm->getDataLayout().getPointerSize());
2630 Asm->OutStreamer.EmitIntValue(0, Asm->getDataLayout().getPointerSize());
2635 // Emit visible names into a debug str section.
2636 void DwarfDebug::emitDebugStr() {
2637 DwarfUnits &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2638 Holder.emitStrings(Asm->getObjFileLowering().getDwarfStrSection());
2641 // Emit locations into the debug loc section.
2642 void DwarfDebug::emitDebugLoc() {
2643 if (DotDebugLocEntries.empty())
2646 for (SmallVectorImpl<DotDebugLocEntry>::iterator
2647 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2649 DotDebugLocEntry &Entry = *I;
2650 if (I + 1 != DotDebugLocEntries.end())
2654 // Start the dwarf loc section.
2655 Asm->OutStreamer.SwitchSection(
2656 Asm->getObjFileLowering().getDwarfLocSection());
2657 unsigned char Size = Asm->getDataLayout().getPointerSize();
2658 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
2660 for (SmallVectorImpl<DotDebugLocEntry>::iterator
2661 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2662 I != E; ++I, ++index) {
2663 DotDebugLocEntry &Entry = *I;
2664 if (Entry.isMerged()) continue;
2665 if (Entry.isEmpty()) {
2666 Asm->OutStreamer.EmitIntValue(0, Size);
2667 Asm->OutStreamer.EmitIntValue(0, Size);
2668 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
2670 Asm->OutStreamer.EmitSymbolValue(Entry.getBeginSym(), Size);
2671 Asm->OutStreamer.EmitSymbolValue(Entry.getEndSym(), Size);
2672 DIVariable DV(Entry.getVariable());
2673 Asm->OutStreamer.AddComment("Loc expr size");
2674 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
2675 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
2676 Asm->EmitLabelDifference(end, begin, 2);
2677 Asm->OutStreamer.EmitLabel(begin);
2678 if (Entry.isInt()) {
2679 DIBasicType BTy(DV.getType());
2681 (BTy.getEncoding() == dwarf::DW_ATE_signed
2682 || BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
2683 Asm->OutStreamer.AddComment("DW_OP_consts");
2684 Asm->EmitInt8(dwarf::DW_OP_consts);
2685 Asm->EmitSLEB128(Entry.getInt());
2687 Asm->OutStreamer.AddComment("DW_OP_constu");
2688 Asm->EmitInt8(dwarf::DW_OP_constu);
2689 Asm->EmitULEB128(Entry.getInt());
2691 } else if (Entry.isLocation()) {
2692 MachineLocation Loc = Entry.getLoc();
2693 if (!DV.hasComplexAddress())
2695 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2697 // Complex address entry.
2698 unsigned N = DV.getNumAddrElements();
2700 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
2701 if (Loc.getOffset()) {
2703 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2704 Asm->OutStreamer.AddComment("DW_OP_deref");
2705 Asm->EmitInt8(dwarf::DW_OP_deref);
2706 Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
2707 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2708 Asm->EmitSLEB128(DV.getAddrElement(1));
2710 // If first address element is OpPlus then emit
2711 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
2712 MachineLocation TLoc(Loc.getReg(), DV.getAddrElement(1));
2713 Asm->EmitDwarfRegOp(TLoc, DV.isIndirect());
2717 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2720 // Emit remaining complex address elements.
2721 for (; i < N; ++i) {
2722 uint64_t Element = DV.getAddrElement(i);
2723 if (Element == DIBuilder::OpPlus) {
2724 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2725 Asm->EmitULEB128(DV.getAddrElement(++i));
2726 } else if (Element == DIBuilder::OpDeref) {
2728 Asm->EmitInt8(dwarf::DW_OP_deref);
2730 llvm_unreachable("unknown Opcode found in complex address");
2734 // else ... ignore constant fp. There is not any good way to
2735 // to represent them here in dwarf.
2736 Asm->OutStreamer.EmitLabel(end);
2741 struct SymbolCUSorter {
2742 SymbolCUSorter(const MCStreamer &s) : Streamer(s) {}
2743 const MCStreamer &Streamer;
2745 bool operator() (const SymbolCU &A, const SymbolCU &B) {
2746 unsigned IA = A.Sym ? Streamer.GetSymbolOrder(A.Sym) : 0;
2747 unsigned IB = B.Sym ? Streamer.GetSymbolOrder(B.Sym) : 0;
2749 // Symbols with no order assigned should be placed at the end.
2750 // (e.g. section end labels)
2752 IA = (unsigned)(-1);
2754 IB = (unsigned)(-1);
2759 static bool CUSort(const CompileUnit *A, const CompileUnit *B) {
2760 return (A->getUniqueID() < B->getUniqueID());
2764 const MCSymbol *Start, *End;
2767 // Emit a debug aranges section, containing a CU lookup for any
2768 // address we can tie back to a CU.
2769 void DwarfDebug::emitDebugARanges() {
2770 // Start the dwarf aranges section.
2772 .SwitchSection(Asm->getObjFileLowering().getDwarfARangesSection());
2774 typedef DenseMap<CompileUnit *, std::vector<ArangeSpan> > SpansType;
2778 // Build a list of sections used.
2779 std::vector<const MCSection *> Sections;
2780 for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
2782 const MCSection *Section = it->first;
2783 Sections.push_back(Section);
2786 // Sort the sections into order.
2787 // This is only done to ensure consistent output order across different runs.
2788 std::sort(Sections.begin(), Sections.end(), SectionSort);
2790 // Build a set of address spans, sorted by CU.
2791 for (size_t SecIdx=0;SecIdx<Sections.size();SecIdx++) {
2792 const MCSection *Section = Sections[SecIdx];
2793 SmallVector<SymbolCU, 8> &List = SectionMap[Section];
2794 if (List.size() < 2)
2797 // Sort the symbols by offset within the section.
2798 SymbolCUSorter sorter(Asm->OutStreamer);
2799 std::sort(List.begin(), List.end(), sorter);
2801 // If we have no section (e.g. common), just write out
2802 // individual spans for each symbol.
2803 if (Section == NULL) {
2804 for (size_t n = 0; n < List.size(); n++) {
2805 const SymbolCU &Cur = List[n];
2808 Span.Start = Cur.Sym;
2811 Spans[Cur.CU].push_back(Span);
2814 // Build spans between each label.
2815 const MCSymbol *StartSym = List[0].Sym;
2816 for (size_t n = 1; n < List.size(); n++) {
2817 const SymbolCU &Prev = List[n - 1];
2818 const SymbolCU &Cur = List[n];
2820 // Try and build the longest span we can within the same CU.
2821 if (Cur.CU != Prev.CU) {
2823 Span.Start = StartSym;
2825 Spans[Prev.CU].push_back(Span);
2832 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2833 unsigned PtrSize = Asm->getDataLayout().getPointerSize();
2835 // Build a list of CUs used.
2836 std::vector<CompileUnit *> CUs;
2837 for (SpansType::iterator it = Spans.begin(); it != Spans.end(); it++) {
2838 CompileUnit *CU = it->first;
2842 // Sort the CU list (again, to ensure consistent output order).
2843 std::sort(CUs.begin(), CUs.end(), CUSort);
2845 // Emit an arange table for each CU we used.
2846 for (size_t CUIdx=0;CUIdx<CUs.size();CUIdx++) {
2847 CompileUnit *CU = CUs[CUIdx];
2848 std::vector<ArangeSpan> &List = Spans[CU];
2850 // Emit size of content not including length itself.
2851 unsigned ContentSize
2852 = sizeof(int16_t) // DWARF ARange version number
2853 + sizeof(int32_t) // Offset of CU in the .debug_info section
2854 + sizeof(int8_t) // Pointer Size (in bytes)
2855 + sizeof(int8_t); // Segment Size (in bytes)
2857 unsigned TupleSize = PtrSize * 2;
2859 // 7.20 in the Dwarf specs requires the table to be aligned to a tuple.
2860 unsigned Padding = 0;
2861 while (((sizeof(int32_t) + ContentSize + Padding) % TupleSize) != 0)
2864 ContentSize += Padding;
2865 ContentSize += (List.size() + 1) * TupleSize;
2867 // For each compile unit, write the list of spans it covers.
2868 Asm->OutStreamer.AddComment("Length of ARange Set");
2869 Asm->EmitInt32(ContentSize);
2870 Asm->OutStreamer.AddComment("DWARF Arange version number");
2871 Asm->EmitInt16(dwarf::DW_ARANGES_VERSION);
2872 Asm->OutStreamer.AddComment("Offset Into Debug Info Section");
2873 Asm->EmitSectionOffset(
2874 Asm->GetTempSymbol(ISec->getLabelBeginName(), CU->getUniqueID()),
2875 DwarfInfoSectionSym);
2876 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2877 Asm->EmitInt8(PtrSize);
2878 Asm->OutStreamer.AddComment("Segment Size (in bytes)");
2881 for (unsigned n = 0; n < Padding; n++)
2882 Asm->EmitInt8(0xff);
2884 for (unsigned n = 0; n < List.size(); n++) {
2885 const ArangeSpan &Span = List[n];
2886 Asm->EmitLabelReference(Span.Start, PtrSize);
2888 // Calculate the size as being from the span start to it's end.
2890 Asm->EmitLabelDifference(Span.End, Span.Start, PtrSize);
2892 // For symbols without an end marker (e.g. common), we
2893 // write a single arange entry containing just that one symbol.
2894 uint64_t Size = SymSize[Span.Start];
2898 Asm->OutStreamer.EmitIntValue(Size, PtrSize);
2902 Asm->OutStreamer.AddComment("ARange terminator");
2903 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2904 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2908 // Emit visible names into a debug ranges section.
2909 void DwarfDebug::emitDebugRanges() {
2910 // Start the dwarf ranges section.
2912 .SwitchSection(Asm->getObjFileLowering().getDwarfRangesSection());
2913 unsigned char Size = Asm->getDataLayout().getPointerSize();
2914 for (SmallVectorImpl<const MCSymbol *>::iterator
2915 I = DebugRangeSymbols.begin(), E = DebugRangeSymbols.end();
2918 Asm->OutStreamer.EmitSymbolValue(const_cast<MCSymbol*>(*I), Size);
2920 Asm->OutStreamer.EmitIntValue(0, Size);
2924 // Emit visible names into a debug macinfo section.
2925 void DwarfDebug::emitDebugMacInfo() {
2926 if (const MCSection *LineInfo =
2927 Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
2928 // Start the dwarf macinfo section.
2929 Asm->OutStreamer.SwitchSection(LineInfo);
2933 // DWARF5 Experimental Separate Dwarf emitters.
2935 // This DIE has the following attributes: DW_AT_comp_dir, DW_AT_stmt_list,
2936 // DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges, DW_AT_dwo_name, DW_AT_dwo_id,
2937 // DW_AT_ranges_base, DW_AT_addr_base.
2938 CompileUnit *DwarfDebug::constructSkeletonCU(const CompileUnit *CU) {
2940 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
2941 CompileUnit *NewCU = new CompileUnit(CU->getUniqueID(), Die, CU->getNode(),
2942 Asm, this, &SkeletonHolder);
2944 NewCU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name,
2945 DICompileUnit(CU->getNode()).getSplitDebugFilename());
2947 // Relocate to the beginning of the addr_base section, else 0 for the
2948 // beginning of the one for this compile unit.
2949 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2950 NewCU->addLabel(Die, dwarf::DW_AT_GNU_addr_base, dwarf::DW_FORM_sec_offset,
2951 DwarfAddrSectionSym);
2953 NewCU->addUInt(Die, dwarf::DW_AT_GNU_addr_base,
2954 dwarf::DW_FORM_sec_offset, 0);
2956 // 2.17.1 requires that we use DW_AT_low_pc for a single entry point
2957 // into an entity. We're using 0, or a NULL label for this.
2958 NewCU->addUInt(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, 0);
2960 // DW_AT_stmt_list is a offset of line number information for this
2961 // compile unit in debug_line section.
2962 // FIXME: Should handle multiple compile units.
2963 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2964 NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_sec_offset,
2965 DwarfLineSectionSym);
2967 NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_sec_offset, 0);
2969 if (!CompilationDir.empty())
2970 NewCU->addLocalString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
2972 // Flags to let the linker know we have emitted new style pubnames.
2973 if (GenerateGnuPubSections) {
2974 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2975 NewCU->addLabel(Die, dwarf::DW_AT_GNU_pubnames, dwarf::DW_FORM_sec_offset,
2976 Asm->GetTempSymbol("gnu_pubnames", NewCU->getUniqueID()));
2978 NewCU->addDelta(Die, dwarf::DW_AT_GNU_pubnames, dwarf::DW_FORM_data4,
2979 Asm->GetTempSymbol("gnu_pubnames", NewCU->getUniqueID()),
2980 DwarfGnuPubNamesSectionSym);
2982 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2983 NewCU->addLabel(Die, dwarf::DW_AT_GNU_pubtypes, dwarf::DW_FORM_sec_offset,
2984 Asm->GetTempSymbol("gnu_pubtypes", NewCU->getUniqueID()));
2986 NewCU->addDelta(Die, dwarf::DW_AT_GNU_pubtypes, dwarf::DW_FORM_data4,
2987 Asm->GetTempSymbol("gnu_pubtypes", NewCU->getUniqueID()),
2988 DwarfGnuPubTypesSectionSym);
2991 // Flag if we've emitted any ranges and their location for the compile unit.
2992 if (DebugRangeSymbols.size()) {
2993 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2994 NewCU->addLabel(Die, dwarf::DW_AT_GNU_ranges_base,
2995 dwarf::DW_FORM_sec_offset, DwarfDebugRangeSectionSym);
2997 NewCU->addUInt(Die, dwarf::DW_AT_GNU_ranges_base, dwarf::DW_FORM_data4,
3001 SkeletonHolder.addUnit(NewCU);
3002 SkeletonCUs.push_back(NewCU);
3007 void DwarfDebug::emitSkeletonAbbrevs(const MCSection *Section) {
3008 assert(useSplitDwarf() && "No split dwarf debug info?");
3009 emitAbbrevs(Section, &SkeletonAbbrevs);
3012 // Emit the .debug_info.dwo section for separated dwarf. This contains the
3013 // compile units that would normally be in debug_info.
3014 void DwarfDebug::emitDebugInfoDWO() {
3015 assert(useSplitDwarf() && "No split dwarf debug info?");
3016 InfoHolder.emitUnits(this, Asm->getObjFileLowering().getDwarfInfoDWOSection(),
3017 Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
3018 DwarfAbbrevDWOSectionSym);
3021 // Emit the .debug_abbrev.dwo section for separated dwarf. This contains the
3022 // abbreviations for the .debug_info.dwo section.
3023 void DwarfDebug::emitDebugAbbrevDWO() {
3024 assert(useSplitDwarf() && "No split dwarf?");
3025 emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
3029 // Emit the .debug_str.dwo section for separated dwarf. This contains the
3030 // string section and is identical in format to traditional .debug_str
3032 void DwarfDebug::emitDebugStrDWO() {
3033 assert(useSplitDwarf() && "No split dwarf?");
3034 const MCSection *OffSec = Asm->getObjFileLowering()
3035 .getDwarfStrOffDWOSection();
3036 const MCSymbol *StrSym = DwarfStrSectionSym;
3037 InfoHolder.emitStrings(Asm->getObjFileLowering().getDwarfStrDWOSection(),