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 DIType DbgVariable::getType() const {
120 DIType Ty = Var.getType();
121 // FIXME: isBlockByrefVariable should be reformulated in terms of complex
122 // addresses instead.
123 if (Var.isBlockByrefVariable()) {
124 /* Byref variables, in Blocks, are declared by the programmer as
125 "SomeType VarName;", but the compiler creates a
126 __Block_byref_x_VarName struct, and gives the variable VarName
127 either the struct, or a pointer to the struct, as its type. This
128 is necessary for various behind-the-scenes things the compiler
129 needs to do with by-reference variables in blocks.
131 However, as far as the original *programmer* is concerned, the
132 variable should still have type 'SomeType', as originally declared.
134 The following function dives into the __Block_byref_x_VarName
135 struct to find the original type of the variable. This will be
136 passed back to the code generating the type for the Debug
137 Information Entry for the variable 'VarName'. 'VarName' will then
138 have the original type 'SomeType' in its debug information.
140 The original type 'SomeType' will be the type of the field named
141 'VarName' inside the __Block_byref_x_VarName struct.
143 NOTE: In order for this to not completely fail on the debugger
144 side, the Debug Information Entry for the variable VarName needs to
145 have a DW_AT_location that tells the debugger how to unwind through
146 the pointers and __Block_byref_x_VarName struct to find the actual
147 value of the variable. The function addBlockByrefType does this. */
149 uint16_t tag = Ty.getTag();
151 if (tag == dwarf::DW_TAG_pointer_type)
152 subType = DIDerivedType(Ty).getTypeDerivedFrom();
154 DIArray Elements = DICompositeType(subType).getTypeArray();
155 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
156 DIDerivedType DT = DIDerivedType(Elements.getElement(i));
157 if (getName() == DT.getName())
158 return (DT.getTypeDerivedFrom());
164 } // end llvm namespace
166 /// Return Dwarf Version by checking module flags.
167 static unsigned getDwarfVersionFromModule(const Module *M) {
168 Value *Val = M->getModuleFlag("Dwarf Version");
170 return dwarf::DWARF_VERSION;
171 return cast<ConstantInt>(Val)->getZExtValue();
174 DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
175 : Asm(A), MMI(Asm->MMI), FirstCU(0),
176 AbbreviationsSet(InitAbbreviationsSetSize),
177 SourceIdMap(DIEValueAllocator),
178 PrevLabel(NULL), GlobalCUIndexCount(0),
179 InfoHolder(A, &AbbreviationsSet, &Abbreviations, "info_string",
181 SkeletonAbbrevSet(InitAbbreviationsSetSize),
182 SkeletonHolder(A, &SkeletonAbbrevSet, &SkeletonAbbrevs, "skel_string",
185 DwarfInfoSectionSym = DwarfAbbrevSectionSym = 0;
186 DwarfStrSectionSym = TextSectionSym = 0;
187 DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = DwarfLineSectionSym = 0;
188 DwarfAddrSectionSym = 0;
189 DwarfAbbrevDWOSectionSym = DwarfStrDWOSectionSym = 0;
190 FunctionBeginSym = FunctionEndSym = 0;
192 // Turn on accelerator tables and older gdb compatibility
193 // for Darwin by default, pubnames by default for non-Darwin,
194 // and handle split dwarf.
195 bool IsDarwin = Triple(A->getTargetTriple()).isOSDarwin();
197 if (DwarfAccelTables == Default)
198 HasDwarfAccelTables = IsDarwin;
200 HasDwarfAccelTables = DwarfAccelTables == Enable;
202 if (SplitDwarf == Default)
203 HasSplitDwarf = false;
205 HasSplitDwarf = SplitDwarf == Enable;
207 if (DwarfPubSections == Default)
208 HasDwarfPubSections = !IsDarwin;
210 HasDwarfPubSections = DwarfPubSections == Enable;
212 DwarfVersion = getDwarfVersionFromModule(MMI->getModule());
215 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
219 DwarfDebug::~DwarfDebug() {
222 // Switch to the specified MCSection and emit an assembler
223 // temporary label to it if SymbolStem is specified.
224 static MCSymbol *emitSectionSym(AsmPrinter *Asm, const MCSection *Section,
225 const char *SymbolStem = 0) {
226 Asm->OutStreamer.SwitchSection(Section);
227 if (!SymbolStem) return 0;
229 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
230 Asm->OutStreamer.EmitLabel(TmpSym);
234 MCSymbol *DwarfUnits::getStringPoolSym() {
235 return Asm->GetTempSymbol(StringPref);
238 MCSymbol *DwarfUnits::getStringPoolEntry(StringRef Str) {
239 std::pair<MCSymbol*, unsigned> &Entry =
240 StringPool.GetOrCreateValue(Str).getValue();
241 if (Entry.first) return Entry.first;
243 Entry.second = NextStringPoolNumber++;
244 return Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
247 unsigned DwarfUnits::getStringPoolIndex(StringRef Str) {
248 std::pair<MCSymbol*, unsigned> &Entry =
249 StringPool.GetOrCreateValue(Str).getValue();
250 if (Entry.first) return Entry.second;
252 Entry.second = NextStringPoolNumber++;
253 Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
257 unsigned DwarfUnits::getAddrPoolIndex(const MCSymbol *Sym) {
258 return getAddrPoolIndex(MCSymbolRefExpr::Create(Sym, Asm->OutContext));
261 unsigned DwarfUnits::getAddrPoolIndex(const MCExpr *Sym) {
262 std::pair<DenseMap<const MCExpr *, unsigned>::iterator, bool> P =
263 AddressPool.insert(std::make_pair(Sym, NextAddrPoolNumber));
265 ++NextAddrPoolNumber;
266 return P.first->second;
269 // Define a unique number for the abbreviation.
271 void DwarfUnits::assignAbbrevNumber(DIEAbbrev &Abbrev) {
272 // Check the set for priors.
273 DIEAbbrev *InSet = AbbreviationsSet->GetOrInsertNode(&Abbrev);
275 // If it's newly added.
276 if (InSet == &Abbrev) {
277 // Add to abbreviation list.
278 Abbreviations->push_back(&Abbrev);
280 // Assign the vector position + 1 as its number.
281 Abbrev.setNumber(Abbreviations->size());
283 // Assign existing abbreviation number.
284 Abbrev.setNumber(InSet->getNumber());
288 static bool isObjCClass(StringRef Name) {
289 return Name.startswith("+") || Name.startswith("-");
292 static bool hasObjCCategory(StringRef Name) {
293 if (!isObjCClass(Name)) return false;
295 return Name.find(") ") != StringRef::npos;
298 static void getObjCClassCategory(StringRef In, StringRef &Class,
299 StringRef &Category) {
300 if (!hasObjCCategory(In)) {
301 Class = In.slice(In.find('[') + 1, In.find(' '));
306 Class = In.slice(In.find('[') + 1, In.find('('));
307 Category = In.slice(In.find('[') + 1, In.find(' '));
311 static StringRef getObjCMethodName(StringRef In) {
312 return In.slice(In.find(' ') + 1, In.find(']'));
315 // Helper for sorting sections into a stable output order.
316 static bool SectionSort(const MCSection *A, const MCSection *B) {
317 std::string LA = (A ? A->getLabelBeginName() : "");
318 std::string LB = (B ? B->getLabelBeginName() : "");
322 // Add the various names to the Dwarf accelerator table names.
323 // TODO: Determine whether or not we should add names for programs
324 // that do not have a DW_AT_name or DW_AT_linkage_name field - this
325 // is only slightly different than the lookup of non-standard ObjC names.
326 static void addSubprogramNames(CompileUnit *TheCU, DISubprogram SP,
328 if (!SP.isDefinition()) return;
329 TheCU->addAccelName(SP.getName(), Die);
331 // If the linkage name is different than the name, go ahead and output
332 // that as well into the name table.
333 if (SP.getLinkageName() != "" && SP.getName() != SP.getLinkageName())
334 TheCU->addAccelName(SP.getLinkageName(), Die);
336 // If this is an Objective-C selector name add it to the ObjC accelerator
338 if (isObjCClass(SP.getName())) {
339 StringRef Class, Category;
340 getObjCClassCategory(SP.getName(), Class, Category);
341 TheCU->addAccelObjC(Class, Die);
343 TheCU->addAccelObjC(Category, Die);
344 // Also add the base method name to the name table.
345 TheCU->addAccelName(getObjCMethodName(SP.getName()), Die);
349 /// isSubprogramContext - Return true if Context is either a subprogram
350 /// or another context nested inside a subprogram.
351 bool DwarfDebug::isSubprogramContext(const MDNode *Context) {
354 DIDescriptor D(Context);
355 if (D.isSubprogram())
358 return isSubprogramContext(resolve(DIType(Context).getContext()));
362 // Find DIE for the given subprogram and attach appropriate DW_AT_low_pc
363 // and DW_AT_high_pc attributes. If there are global variables in this
364 // scope then create and insert DIEs for these variables.
365 DIE *DwarfDebug::updateSubprogramScopeDIE(CompileUnit *SPCU,
366 const MDNode *SPNode) {
367 DIE *SPDie = SPCU->getDIE(SPNode);
369 assert(SPDie && "Unable to find subprogram DIE!");
370 DISubprogram SP(SPNode);
372 // If we're updating an abstract DIE, then we will be adding the children and
373 // object pointer later on. But what we don't want to do is process the
374 // concrete DIE twice.
375 DIE *AbsSPDIE = AbstractSPDies.lookup(SPNode);
377 bool InSameCU = (AbsSPDIE->getCompileUnit() == SPCU->getCUDie());
378 // Pick up abstract subprogram DIE.
379 SPDie = new DIE(dwarf::DW_TAG_subprogram);
380 // If AbsSPDIE belongs to a different CU, use DW_FORM_ref_addr instead of
382 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_abstract_origin,
383 InSameCU ? dwarf::DW_FORM_ref4 : dwarf::DW_FORM_ref_addr,
387 DISubprogram SPDecl = SP.getFunctionDeclaration();
388 if (!SPDecl.isSubprogram()) {
389 // There is not any need to generate specification DIE for a function
390 // defined at compile unit level. If a function is defined inside another
391 // function then gdb prefers the definition at top level and but does not
392 // expect specification DIE in parent function. So avoid creating
393 // specification DIE for a function defined inside a function.
394 if (SP.isDefinition() && !SP.getContext().isCompileUnit() &&
395 !SP.getContext().isFile() &&
396 !isSubprogramContext(SP.getContext())) {
397 SPCU->addFlag(SPDie, dwarf::DW_AT_declaration);
400 DICompositeType SPTy = SP.getType();
401 DIArray Args = SPTy.getTypeArray();
402 uint16_t SPTag = SPTy.getTag();
403 if (SPTag == dwarf::DW_TAG_subroutine_type)
404 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
405 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
406 DIType ATy = DIType(Args.getElement(i));
407 SPCU->addType(Arg, ATy);
408 if (ATy.isArtificial())
409 SPCU->addFlag(Arg, dwarf::DW_AT_artificial);
410 if (ATy.isObjectPointer())
411 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_object_pointer,
412 dwarf::DW_FORM_ref4, Arg);
413 SPDie->addChild(Arg);
415 DIE *SPDeclDie = SPDie;
416 SPDie = new DIE(dwarf::DW_TAG_subprogram);
417 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification,
418 dwarf::DW_FORM_ref4, SPDeclDie);
424 SPCU->addLabelAddress(SPDie, dwarf::DW_AT_low_pc,
425 Asm->GetTempSymbol("func_begin",
426 Asm->getFunctionNumber()));
427 SPCU->addLabelAddress(SPDie, dwarf::DW_AT_high_pc,
428 Asm->GetTempSymbol("func_end",
429 Asm->getFunctionNumber()));
430 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
431 MachineLocation Location(RI->getFrameRegister(*Asm->MF));
432 SPCU->addAddress(SPDie, dwarf::DW_AT_frame_base, Location);
434 // Add name to the name table, we do this here because we're guaranteed
435 // to have concrete versions of our DW_TAG_subprogram nodes.
436 addSubprogramNames(SPCU, SP, SPDie);
441 /// Check whether we should create a DIE for the given Scope, return true
442 /// if we don't create a DIE (the corresponding DIE is null).
443 bool DwarfDebug::isLexicalScopeDIENull(LexicalScope *Scope) {
444 if (Scope->isAbstractScope())
447 // We don't create a DIE if there is no Range.
448 const SmallVectorImpl<InsnRange> &Ranges = Scope->getRanges();
452 if (Ranges.size() > 1)
455 // We don't create a DIE if we have a single Range and the end label
457 SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin();
458 MCSymbol *End = getLabelAfterInsn(RI->second);
462 // Construct new DW_TAG_lexical_block for this scope and attach
463 // DW_AT_low_pc/DW_AT_high_pc labels.
464 DIE *DwarfDebug::constructLexicalScopeDIE(CompileUnit *TheCU,
465 LexicalScope *Scope) {
466 if (isLexicalScopeDIENull(Scope))
469 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_lexical_block);
470 if (Scope->isAbstractScope())
473 const SmallVectorImpl<InsnRange> &Ranges = Scope->getRanges();
474 // If we have multiple ranges, emit them into the range section.
475 if (Ranges.size() > 1) {
476 // .debug_range section has not been laid out yet. Emit offset in
477 // .debug_range as a uint, size 4, for now. emitDIE will handle
478 // DW_AT_ranges appropriately.
479 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_ranges, dwarf::DW_FORM_data4,
480 DebugRangeSymbols.size()
481 * Asm->getDataLayout().getPointerSize());
482 for (SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin(),
483 RE = Ranges.end(); RI != RE; ++RI) {
484 DebugRangeSymbols.push_back(getLabelBeforeInsn(RI->first));
485 DebugRangeSymbols.push_back(getLabelAfterInsn(RI->second));
488 // Terminate the range list.
489 DebugRangeSymbols.push_back(NULL);
490 DebugRangeSymbols.push_back(NULL);
494 // Construct the address range for this DIE.
495 SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin();
496 MCSymbol *Start = getLabelBeforeInsn(RI->first);
497 MCSymbol *End = getLabelAfterInsn(RI->second);
498 assert(End && "End label should not be null!");
500 assert(Start->isDefined() && "Invalid starting label for an inlined scope!");
501 assert(End->isDefined() && "Invalid end label for an inlined scope!");
503 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_low_pc, Start);
504 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_high_pc, End);
509 // This scope represents inlined body of a function. Construct DIE to
510 // represent this concrete inlined copy of the function.
511 DIE *DwarfDebug::constructInlinedScopeDIE(CompileUnit *TheCU,
512 LexicalScope *Scope) {
513 const SmallVectorImpl<InsnRange> &Ranges = Scope->getRanges();
514 assert(Ranges.empty() == false &&
515 "LexicalScope does not have instruction markers!");
517 if (!Scope->getScopeNode())
519 DIScope DS(Scope->getScopeNode());
520 DISubprogram InlinedSP = getDISubprogram(DS);
521 DIE *OriginDIE = TheCU->getDIE(InlinedSP);
523 DEBUG(dbgs() << "Unable to find original DIE for an inlined subprogram.");
527 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine);
528 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin,
529 dwarf::DW_FORM_ref4, OriginDIE);
531 if (Ranges.size() > 1) {
532 // .debug_range section has not been laid out yet. Emit offset in
533 // .debug_range as a uint, size 4, for now. emitDIE will handle
534 // DW_AT_ranges appropriately.
535 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_ranges, dwarf::DW_FORM_data4,
536 DebugRangeSymbols.size()
537 * Asm->getDataLayout().getPointerSize());
538 for (SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin(),
539 RE = Ranges.end(); RI != RE; ++RI) {
540 DebugRangeSymbols.push_back(getLabelBeforeInsn(RI->first));
541 DebugRangeSymbols.push_back(getLabelAfterInsn(RI->second));
543 DebugRangeSymbols.push_back(NULL);
544 DebugRangeSymbols.push_back(NULL);
546 SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin();
547 MCSymbol *StartLabel = getLabelBeforeInsn(RI->first);
548 MCSymbol *EndLabel = getLabelAfterInsn(RI->second);
550 if (StartLabel == 0 || EndLabel == 0)
551 llvm_unreachable("Unexpected Start and End labels for an inlined scope!");
553 assert(StartLabel->isDefined() &&
554 "Invalid starting label for an inlined scope!");
555 assert(EndLabel->isDefined() && "Invalid end label for an inlined scope!");
557 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_low_pc, StartLabel);
558 TheCU->addLabelAddress(ScopeDIE, dwarf::DW_AT_high_pc, EndLabel);
561 InlinedSubprogramDIEs.insert(OriginDIE);
563 // Add the call site information to the DIE.
564 DILocation DL(Scope->getInlinedAt());
565 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_file, 0,
566 getOrCreateSourceID(DL.getFilename(), DL.getDirectory(),
567 TheCU->getUniqueID()));
568 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_line, 0, DL.getLineNumber());
570 // Add name to the name table, we do this here because we're guaranteed
571 // to have concrete versions of our DW_TAG_inlined_subprogram nodes.
572 addSubprogramNames(TheCU, InlinedSP, ScopeDIE);
577 DIE *DwarfDebug::createScopeChildrenDIE(CompileUnit *TheCU, LexicalScope *Scope,
578 SmallVectorImpl<DIE*> &Children) {
579 DIE *ObjectPointer = NULL;
581 // Collect arguments for current function.
582 if (LScopes.isCurrentFunctionScope(Scope))
583 for (unsigned i = 0, N = CurrentFnArguments.size(); i < N; ++i)
584 if (DbgVariable *ArgDV = CurrentFnArguments[i])
586 TheCU->constructVariableDIE(ArgDV, Scope->isAbstractScope())) {
587 Children.push_back(Arg);
588 if (ArgDV->isObjectPointer()) ObjectPointer = Arg;
591 // Collect lexical scope children first.
592 const SmallVectorImpl<DbgVariable *> &Variables =ScopeVariables.lookup(Scope);
593 for (unsigned i = 0, N = Variables.size(); i < N; ++i)
595 TheCU->constructVariableDIE(Variables[i], Scope->isAbstractScope())) {
596 Children.push_back(Variable);
597 if (Variables[i]->isObjectPointer()) ObjectPointer = Variable;
599 const SmallVectorImpl<LexicalScope *> &Scopes = Scope->getChildren();
600 for (unsigned j = 0, M = Scopes.size(); j < M; ++j)
601 if (DIE *Nested = constructScopeDIE(TheCU, Scopes[j]))
602 Children.push_back(Nested);
603 return ObjectPointer;
606 // Construct a DIE for this scope.
607 DIE *DwarfDebug::constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope) {
608 if (!Scope || !Scope->getScopeNode())
611 DIScope DS(Scope->getScopeNode());
613 SmallVector<DIE *, 8> Children;
614 DIE *ObjectPointer = NULL;
615 bool ChildrenCreated = false;
617 // We try to create the scope DIE first, then the children DIEs. This will
618 // avoid creating un-used children then removing them later when we find out
619 // the scope DIE is null.
620 DIE *ScopeDIE = NULL;
621 if (Scope->getInlinedAt())
622 ScopeDIE = constructInlinedScopeDIE(TheCU, Scope);
623 else if (DS.isSubprogram()) {
624 ProcessedSPNodes.insert(DS);
625 if (Scope->isAbstractScope()) {
626 ScopeDIE = TheCU->getDIE(DS);
627 // Note down abstract DIE.
629 AbstractSPDies.insert(std::make_pair(DS, ScopeDIE));
632 ScopeDIE = updateSubprogramScopeDIE(TheCU, DS);
635 // Early exit when we know the scope DIE is going to be null.
636 if (isLexicalScopeDIENull(Scope))
639 // We create children here when we know the scope DIE is not going to be
640 // null and the children will be added to the scope DIE.
641 ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
642 ChildrenCreated = true;
644 // There is no need to emit empty lexical block DIE.
645 std::pair<ImportedEntityMap::const_iterator,
646 ImportedEntityMap::const_iterator> Range = std::equal_range(
647 ScopesWithImportedEntities.begin(), ScopesWithImportedEntities.end(),
648 std::pair<const MDNode *, const MDNode *>(DS, (const MDNode*)0),
650 if (Children.empty() && Range.first == Range.second)
652 ScopeDIE = constructLexicalScopeDIE(TheCU, Scope);
653 assert(ScopeDIE && "Scope DIE should not be null.");
654 for (ImportedEntityMap::const_iterator i = Range.first; i != Range.second;
656 constructImportedEntityDIE(TheCU, i->second, ScopeDIE);
660 assert(Children.empty() &&
661 "We create children only when the scope DIE is not null.");
664 if (!ChildrenCreated)
665 // We create children when the scope DIE is not null.
666 ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
669 for (SmallVectorImpl<DIE *>::iterator I = Children.begin(),
670 E = Children.end(); I != E; ++I)
671 ScopeDIE->addChild(*I);
673 if (DS.isSubprogram() && ObjectPointer != NULL)
674 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer,
675 dwarf::DW_FORM_ref4, ObjectPointer);
677 if (DS.isSubprogram())
678 TheCU->addPubTypes(DISubprogram(DS));
683 // Look up the source id with the given directory and source file names.
684 // If none currently exists, create a new id and insert it in the
685 // SourceIds map. This can update DirectoryNames and SourceFileNames maps
687 unsigned DwarfDebug::getOrCreateSourceID(StringRef FileName,
688 StringRef DirName, unsigned CUID) {
689 // If we use .loc in assembly, we can't separate .file entries according to
690 // compile units. Thus all files will belong to the default compile unit.
691 if (Asm->TM.hasMCUseLoc() &&
692 Asm->OutStreamer.getKind() == MCStreamer::SK_AsmStreamer)
695 // If FE did not provide a file name, then assume stdin.
696 if (FileName.empty())
697 return getOrCreateSourceID("<stdin>", StringRef(), CUID);
699 // TODO: this might not belong here. See if we can factor this better.
700 if (DirName == CompilationDir)
703 // FileIDCUMap stores the current ID for the given compile unit.
704 unsigned SrcId = FileIDCUMap[CUID] + 1;
706 // We look up the CUID/file/dir by concatenating them with a zero byte.
707 SmallString<128> NamePair;
708 NamePair += utostr(CUID);
711 NamePair += '\0'; // Zero bytes are not allowed in paths.
712 NamePair += FileName;
714 StringMapEntry<unsigned> &Ent = SourceIdMap.GetOrCreateValue(NamePair, SrcId);
715 if (Ent.getValue() != SrcId)
716 return Ent.getValue();
718 FileIDCUMap[CUID] = SrcId;
719 // Print out a .file directive to specify files for .loc directives.
720 Asm->OutStreamer.EmitDwarfFileDirective(SrcId, DirName, FileName, CUID);
725 // Create new CompileUnit for the given metadata node with tag
726 // DW_TAG_compile_unit.
727 CompileUnit *DwarfDebug::constructCompileUnit(const MDNode *N) {
728 DICompileUnit DIUnit(N);
729 StringRef FN = DIUnit.getFilename();
730 CompilationDir = DIUnit.getDirectory();
732 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
734 new CompileUnit(GlobalCUIndexCount++, Die, N, Asm, this, &InfoHolder);
736 FileIDCUMap[NewCU->getUniqueID()] = 0;
737 // Call this to emit a .file directive if it wasn't emitted for the source
738 // file this CU comes from yet.
739 getOrCreateSourceID(FN, CompilationDir, NewCU->getUniqueID());
741 NewCU->addString(Die, dwarf::DW_AT_producer, DIUnit.getProducer());
742 NewCU->addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
743 DIUnit.getLanguage());
744 NewCU->addString(Die, dwarf::DW_AT_name, FN);
746 // 2.17.1 requires that we use DW_AT_low_pc for a single entry point
747 // into an entity. We're using 0 (or a NULL label) for this. For
748 // split dwarf it's in the skeleton CU so omit it here.
749 if (!useSplitDwarf())
750 NewCU->addLabelAddress(Die, dwarf::DW_AT_low_pc, NULL);
752 // Define start line table label for each Compile Unit.
753 MCSymbol *LineTableStartSym = Asm->GetTempSymbol("line_table_start",
754 NewCU->getUniqueID());
755 Asm->OutStreamer.getContext().setMCLineTableSymbol(LineTableStartSym,
756 NewCU->getUniqueID());
758 // Use a single line table if we are using .loc and generating assembly.
760 (Asm->TM.hasMCUseLoc() &&
761 Asm->OutStreamer.getKind() == MCStreamer::SK_AsmStreamer) ||
762 (NewCU->getUniqueID() == 0);
764 if (!useSplitDwarf()) {
765 // DW_AT_stmt_list is a offset of line number information for this
766 // compile unit in debug_line section. For split dwarf this is
767 // left in the skeleton CU and so not included.
768 // The line table entries are not always emitted in assembly, so it
769 // is not okay to use line_table_start here.
770 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
771 NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_sec_offset,
772 UseTheFirstCU ? Asm->GetTempSymbol("section_line")
773 : LineTableStartSym);
774 else if (UseTheFirstCU)
775 NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0);
777 NewCU->addDelta(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
778 LineTableStartSym, DwarfLineSectionSym);
780 // If we're using split dwarf the compilation dir is going to be in the
781 // skeleton CU and so we don't need to duplicate it here.
782 if (!CompilationDir.empty())
783 NewCU->addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
785 // Flags to let the linker know we have emitted new style pubnames. Only
786 // emit it here if we don't have a skeleton CU for split dwarf.
787 if (GenerateGnuPubSections) {
788 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
789 NewCU->addLabel(Die, dwarf::DW_AT_GNU_pubnames,
790 dwarf::DW_FORM_sec_offset,
791 Asm->GetTempSymbol("gnu_pubnames",
792 NewCU->getUniqueID()));
794 NewCU->addDelta(Die, dwarf::DW_AT_GNU_pubnames, dwarf::DW_FORM_data4,
795 Asm->GetTempSymbol("gnu_pubnames",
796 NewCU->getUniqueID()),
797 DwarfGnuPubNamesSectionSym);
799 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
800 NewCU->addLabel(Die, dwarf::DW_AT_GNU_pubtypes,
801 dwarf::DW_FORM_sec_offset,
802 Asm->GetTempSymbol("gnu_pubtypes",
803 NewCU->getUniqueID()));
805 NewCU->addDelta(Die, dwarf::DW_AT_GNU_pubtypes, dwarf::DW_FORM_data4,
806 Asm->GetTempSymbol("gnu_pubtypes",
807 NewCU->getUniqueID()),
808 DwarfGnuPubTypesSectionSym);
812 if (DIUnit.isOptimized())
813 NewCU->addFlag(Die, dwarf::DW_AT_APPLE_optimized);
815 StringRef Flags = DIUnit.getFlags();
817 NewCU->addString(Die, dwarf::DW_AT_APPLE_flags, Flags);
819 if (unsigned RVer = DIUnit.getRunTimeVersion())
820 NewCU->addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
821 dwarf::DW_FORM_data1, RVer);
826 InfoHolder.addUnit(NewCU);
828 CUMap.insert(std::make_pair(N, NewCU));
832 // Construct subprogram DIE.
833 void DwarfDebug::constructSubprogramDIE(CompileUnit *TheCU,
835 CompileUnit *&CURef = SPMap[N];
841 if (!SP.isDefinition())
842 // This is a method declaration which will be handled while constructing
846 DIE *SubprogramDie = TheCU->getOrCreateSubprogramDIE(SP);
848 // Expose as a global name.
849 TheCU->addGlobalName(SP.getName(), SubprogramDie);
852 void DwarfDebug::constructImportedEntityDIE(CompileUnit *TheCU,
854 DIImportedEntity Module(N);
855 if (!Module.Verify())
857 if (DIE *D = TheCU->getOrCreateContextDIE(Module.getContext()))
858 constructImportedEntityDIE(TheCU, Module, D);
861 void DwarfDebug::constructImportedEntityDIE(CompileUnit *TheCU, const MDNode *N,
863 DIImportedEntity Module(N);
864 if (!Module.Verify())
866 return constructImportedEntityDIE(TheCU, Module, Context);
869 void DwarfDebug::constructImportedEntityDIE(CompileUnit *TheCU,
870 const DIImportedEntity &Module,
872 assert(Module.Verify() &&
873 "Use one of the MDNode * overloads to handle invalid metadata");
874 assert(Context && "Should always have a context for an imported_module");
875 DIE *IMDie = new DIE(Module.getTag());
876 TheCU->insertDIE(Module, IMDie);
878 DIDescriptor Entity = Module.getEntity();
879 if (Entity.isNameSpace())
880 EntityDie = TheCU->getOrCreateNameSpace(DINameSpace(Entity));
881 else if (Entity.isSubprogram())
882 EntityDie = TheCU->getOrCreateSubprogramDIE(DISubprogram(Entity));
883 else if (Entity.isType())
884 EntityDie = TheCU->getOrCreateTypeDIE(DIType(Entity));
886 EntityDie = TheCU->getDIE(Entity);
887 unsigned FileID = getOrCreateSourceID(Module.getContext().getFilename(),
888 Module.getContext().getDirectory(),
889 TheCU->getUniqueID());
890 TheCU->addUInt(IMDie, dwarf::DW_AT_decl_file, 0, FileID);
891 TheCU->addUInt(IMDie, dwarf::DW_AT_decl_line, 0, Module.getLineNumber());
892 TheCU->addDIEEntry(IMDie, dwarf::DW_AT_import, dwarf::DW_FORM_ref4,
894 StringRef Name = Module.getName();
896 TheCU->addString(IMDie, dwarf::DW_AT_name, Name);
897 Context->addChild(IMDie);
900 // Emit all Dwarf sections that should come prior to the content. Create
901 // global DIEs and emit initial debug info sections. This is invoked by
902 // the target AsmPrinter.
903 void DwarfDebug::beginModule() {
904 if (DisableDebugInfoPrinting)
907 const Module *M = MMI->getModule();
909 // If module has named metadata anchors then use them, otherwise scan the
910 // module using debug info finder to collect debug info.
911 NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
914 TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
916 // Emit initial sections so we can reference labels later.
919 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
920 DICompileUnit CUNode(CU_Nodes->getOperand(i));
921 CompileUnit *CU = constructCompileUnit(CUNode);
922 DIArray ImportedEntities = CUNode.getImportedEntities();
923 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
924 ScopesWithImportedEntities.push_back(std::make_pair(
925 DIImportedEntity(ImportedEntities.getElement(i)).getContext(),
926 ImportedEntities.getElement(i)));
927 std::sort(ScopesWithImportedEntities.begin(),
928 ScopesWithImportedEntities.end(), less_first());
929 DIArray GVs = CUNode.getGlobalVariables();
930 for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i)
931 CU->createGlobalVariableDIE(GVs.getElement(i));
932 DIArray SPs = CUNode.getSubprograms();
933 for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
934 constructSubprogramDIE(CU, SPs.getElement(i));
935 DIArray EnumTypes = CUNode.getEnumTypes();
936 for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i)
937 CU->getOrCreateTypeDIE(EnumTypes.getElement(i));
938 DIArray RetainedTypes = CUNode.getRetainedTypes();
939 for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i)
940 CU->getOrCreateTypeDIE(RetainedTypes.getElement(i));
941 // Emit imported_modules last so that the relevant context is already
943 for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
944 constructImportedEntityDIE(CU, ImportedEntities.getElement(i));
947 // Tell MMI that we have debug info.
948 MMI->setDebugInfoAvailability(true);
950 // Prime section data.
951 SectionMap[Asm->getObjFileLowering().getTextSection()];
954 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
955 void DwarfDebug::computeInlinedDIEs() {
956 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
957 for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(),
958 AE = InlinedSubprogramDIEs.end(); AI != AE; ++AI) {
960 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, 0, dwarf::DW_INL_inlined);
962 for (DenseMap<const MDNode *, DIE *>::iterator AI = AbstractSPDies.begin(),
963 AE = AbstractSPDies.end(); AI != AE; ++AI) {
964 DIE *ISP = AI->second;
965 if (InlinedSubprogramDIEs.count(ISP))
967 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, 0, dwarf::DW_INL_inlined);
971 // Collect info for variables that were optimized out.
972 void DwarfDebug::collectDeadVariables() {
973 const Module *M = MMI->getModule();
974 DenseMap<const MDNode *, LexicalScope *> DeadFnScopeMap;
976 if (NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu")) {
977 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
978 DICompileUnit TheCU(CU_Nodes->getOperand(i));
979 DIArray Subprograms = TheCU.getSubprograms();
980 for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
981 DISubprogram SP(Subprograms.getElement(i));
982 if (ProcessedSPNodes.count(SP) != 0) continue;
983 if (!SP.isSubprogram()) continue;
984 if (!SP.isDefinition()) continue;
985 DIArray Variables = SP.getVariables();
986 if (Variables.getNumElements() == 0) continue;
988 LexicalScope *Scope =
989 new LexicalScope(NULL, DIDescriptor(SP), NULL, false);
990 DeadFnScopeMap[SP] = Scope;
992 // Construct subprogram DIE and add variables DIEs.
993 CompileUnit *SPCU = CUMap.lookup(TheCU);
994 assert(SPCU && "Unable to find Compile Unit!");
995 constructSubprogramDIE(SPCU, SP);
996 DIE *ScopeDIE = SPCU->getDIE(SP);
997 for (unsigned vi = 0, ve = Variables.getNumElements(); vi != ve; ++vi) {
998 DIVariable DV(Variables.getElement(vi));
999 if (!DV.isVariable()) continue;
1000 DbgVariable NewVar(DV, NULL);
1001 if (DIE *VariableDIE =
1002 SPCU->constructVariableDIE(&NewVar, Scope->isAbstractScope()))
1003 ScopeDIE->addChild(VariableDIE);
1008 DeleteContainerSeconds(DeadFnScopeMap);
1011 // Type Signature [7.27] and ODR Hash code.
1013 /// \brief Grabs the string in whichever attribute is passed in and returns
1014 /// a reference to it. Returns "" if the attribute doesn't exist.
1015 static StringRef getDIEStringAttr(DIE *Die, unsigned Attr) {
1016 DIEValue *V = Die->findAttribute(Attr);
1018 if (DIEString *S = dyn_cast_or_null<DIEString>(V))
1019 return S->getString();
1021 return StringRef("");
1024 /// Return true if the current DIE is contained within an anonymous namespace.
1025 static bool isContainedInAnonNamespace(DIE *Die) {
1026 DIE *Parent = Die->getParent();
1029 if (Parent->getTag() == dwarf::DW_TAG_namespace &&
1030 getDIEStringAttr(Parent, dwarf::DW_AT_name) == "")
1032 Parent = Parent->getParent();
1038 /// Test if the current CU language is C++ and that we have
1039 /// a named type that is not contained in an anonymous namespace.
1040 static bool shouldAddODRHash(CompileUnit *CU, DIE *Die) {
1041 return CU->getLanguage() == dwarf::DW_LANG_C_plus_plus &&
1042 getDIEStringAttr(Die, dwarf::DW_AT_name) != "" &&
1043 !isContainedInAnonNamespace(Die);
1046 void DwarfDebug::finalizeModuleInfo() {
1047 // Collect info for variables that were optimized out.
1048 collectDeadVariables();
1050 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
1051 computeInlinedDIEs();
1053 // Split out type units and conditionally add an ODR tag to the split
1055 // FIXME: Do type splitting.
1056 for (unsigned i = 0, e = TypeUnits.size(); i != e; ++i) {
1057 DIE *Die = TypeUnits[i];
1059 // If we've requested ODR hashes and it's applicable for an ODR hash then
1060 // add the ODR signature now.
1061 // FIXME: This should be added onto the type unit, not the type, but this
1062 // works as an intermediate stage.
1063 if (GenerateODRHash && shouldAddODRHash(CUMap.begin()->second, Die))
1064 CUMap.begin()->second->addUInt(Die, dwarf::DW_AT_GNU_odr_signature,
1065 dwarf::DW_FORM_data8,
1066 Hash.computeDIEODRSignature(Die));
1069 // Handle anything that needs to be done on a per-cu basis.
1070 for (DenseMap<const MDNode *, CompileUnit *>::iterator CUI = CUMap.begin(),
1072 CUI != CUE; ++CUI) {
1073 CompileUnit *TheCU = CUI->second;
1074 // Emit DW_AT_containing_type attribute to connect types with their
1075 // vtable holding type.
1076 TheCU->constructContainingTypeDIEs();
1078 // If we're splitting the dwarf out now that we've got the entire
1079 // CU then construct a skeleton CU based upon it.
1080 if (useSplitDwarf()) {
1082 if (GenerateCUHash) {
1084 ID = CUHash.computeCUSignature(TheCU->getCUDie());
1086 // This should be a unique identifier when we want to build .dwp files.
1087 TheCU->addUInt(TheCU->getCUDie(), dwarf::DW_AT_GNU_dwo_id,
1088 dwarf::DW_FORM_data8, ID);
1089 // Now construct the skeleton CU associated.
1090 CompileUnit *SkCU = constructSkeletonCU(TheCU);
1091 // This should be a unique identifier when we want to build .dwp files.
1092 SkCU->addUInt(SkCU->getCUDie(), dwarf::DW_AT_GNU_dwo_id,
1093 dwarf::DW_FORM_data8, ID);
1097 // Compute DIE offsets and sizes.
1098 InfoHolder.computeSizeAndOffsets();
1099 if (useSplitDwarf())
1100 SkeletonHolder.computeSizeAndOffsets();
1103 void DwarfDebug::endSections() {
1104 // Filter labels by section.
1105 for (size_t n = 0; n < ArangeLabels.size(); n++) {
1106 const SymbolCU &SCU = ArangeLabels[n];
1107 if (SCU.Sym->isInSection()) {
1108 // Make a note of this symbol and it's section.
1109 const MCSection *Section = &SCU.Sym->getSection();
1110 if (!Section->getKind().isMetadata())
1111 SectionMap[Section].push_back(SCU);
1113 // Some symbols (e.g. common/bss on mach-o) can have no section but still
1114 // appear in the output. This sucks as we rely on sections to build
1115 // arange spans. We can do it without, but it's icky.
1116 SectionMap[NULL].push_back(SCU);
1120 // Build a list of sections used.
1121 std::vector<const MCSection *> Sections;
1122 for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
1124 const MCSection *Section = it->first;
1125 Sections.push_back(Section);
1128 // Sort the sections into order.
1129 // This is only done to ensure consistent output order across different runs.
1130 std::sort(Sections.begin(), Sections.end(), SectionSort);
1132 // Add terminating symbols for each section.
1133 for (unsigned ID=0;ID<Sections.size();ID++) {
1134 const MCSection *Section = Sections[ID];
1135 MCSymbol *Sym = NULL;
1138 // We can't call MCSection::getLabelEndName, as it's only safe to do so
1139 // if we know the section name up-front. For user-created sections, the resulting
1140 // label may not be valid to use as a label. (section names can use a greater
1141 // set of characters on some systems)
1142 Sym = Asm->GetTempSymbol("debug_end", ID);
1143 Asm->OutStreamer.SwitchSection(Section);
1144 Asm->OutStreamer.EmitLabel(Sym);
1147 // Insert a final terminator.
1148 SectionMap[Section].push_back(SymbolCU(NULL, Sym));
1152 // Emit all Dwarf sections that should come after the content.
1153 void DwarfDebug::endModule() {
1155 if (!FirstCU) return;
1157 // End any existing sections.
1158 // TODO: Does this need to happen?
1161 // Finalize the debug info for the module.
1162 finalizeModuleInfo();
1164 if (!useSplitDwarf()) {
1167 // Emit all the DIEs into a debug info section.
1170 // Corresponding abbreviations into a abbrev section.
1171 emitAbbreviations();
1173 // Emit info into a debug loc section.
1176 // Emit info into a debug aranges section.
1179 // Emit info into a debug ranges section.
1182 // Emit info into a debug macinfo section.
1186 // TODO: Fill this in for separated debug sections and separate
1187 // out information into new sections.
1189 if (useSplitDwarf())
1192 // Emit the debug info section and compile units.
1196 // Corresponding abbreviations into a abbrev section.
1197 emitAbbreviations();
1198 emitDebugAbbrevDWO();
1200 // Emit info into a debug loc section.
1203 // Emit info into a debug aranges section.
1206 // Emit info into a debug ranges section.
1209 // Emit info into a debug macinfo section.
1212 // Emit DWO addresses.
1213 InfoHolder.emitAddresses(Asm->getObjFileLowering().getDwarfAddrSection());
1217 // Emit info into the dwarf accelerator table sections.
1218 if (useDwarfAccelTables()) {
1221 emitAccelNamespaces();
1225 // Emit the pubnames and pubtypes sections if requested.
1226 if (HasDwarfPubSections) {
1227 emitDebugPubNames(GenerateGnuPubSections);
1228 emitDebugPubTypes(GenerateGnuPubSections);
1233 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
1234 E = CUMap.end(); I != E; ++I)
1237 for (SmallVectorImpl<CompileUnit *>::iterator I = SkeletonCUs.begin(),
1238 E = SkeletonCUs.end(); I != E; ++I)
1241 // Reset these for the next Module if we have one.
1245 // Find abstract variable, if any, associated with Var.
1246 DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &DV,
1247 DebugLoc ScopeLoc) {
1248 LLVMContext &Ctx = DV->getContext();
1249 // More then one inlined variable corresponds to one abstract variable.
1250 DIVariable Var = cleanseInlinedVariable(DV, Ctx);
1251 DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var);
1253 return AbsDbgVariable;
1255 LexicalScope *Scope = LScopes.findAbstractScope(ScopeLoc.getScope(Ctx));
1259 AbsDbgVariable = new DbgVariable(Var, NULL);
1260 addScopeVariable(Scope, AbsDbgVariable);
1261 AbstractVariables[Var] = AbsDbgVariable;
1262 return AbsDbgVariable;
1265 // If Var is a current function argument then add it to CurrentFnArguments list.
1266 bool DwarfDebug::addCurrentFnArgument(const MachineFunction *MF,
1267 DbgVariable *Var, LexicalScope *Scope) {
1268 if (!LScopes.isCurrentFunctionScope(Scope))
1270 DIVariable DV = Var->getVariable();
1271 if (DV.getTag() != dwarf::DW_TAG_arg_variable)
1273 unsigned ArgNo = DV.getArgNumber();
1277 size_t Size = CurrentFnArguments.size();
1279 CurrentFnArguments.resize(MF->getFunction()->arg_size());
1280 // llvm::Function argument size is not good indicator of how many
1281 // arguments does the function have at source level.
1283 CurrentFnArguments.resize(ArgNo * 2);
1284 CurrentFnArguments[ArgNo - 1] = Var;
1288 // Collect variable information from side table maintained by MMI.
1290 DwarfDebug::collectVariableInfoFromMMITable(const MachineFunction *MF,
1291 SmallPtrSet<const MDNode *, 16> &Processed) {
1292 MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
1293 for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
1294 VE = VMap.end(); VI != VE; ++VI) {
1295 const MDNode *Var = VI->first;
1297 Processed.insert(Var);
1299 const std::pair<unsigned, DebugLoc> &VP = VI->second;
1301 LexicalScope *Scope = LScopes.findLexicalScope(VP.second);
1303 // If variable scope is not found then skip this variable.
1307 DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
1308 DbgVariable *RegVar = new DbgVariable(DV, AbsDbgVariable);
1309 RegVar->setFrameIndex(VP.first);
1310 if (!addCurrentFnArgument(MF, RegVar, Scope))
1311 addScopeVariable(Scope, RegVar);
1313 AbsDbgVariable->setFrameIndex(VP.first);
1317 // Return true if debug value, encoded by DBG_VALUE instruction, is in a
1319 static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
1320 assert(MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
1321 return MI->getNumOperands() == 3 &&
1322 MI->getOperand(0).isReg() && MI->getOperand(0).getReg() &&
1323 (MI->getOperand(1).isImm() ||
1324 (MI->getOperand(1).isReg() && MI->getOperand(1).getReg() == 0U));
1327 // Get .debug_loc entry for the instruction range starting at MI.
1328 static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
1329 const MCSymbol *FLabel,
1330 const MCSymbol *SLabel,
1331 const MachineInstr *MI) {
1332 const MDNode *Var = MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1334 assert(MI->getNumOperands() == 3);
1335 if (MI->getOperand(0).isReg()) {
1336 MachineLocation MLoc;
1337 // If the second operand is an immediate, this is a
1338 // register-indirect address.
1339 if (!MI->getOperand(1).isImm())
1340 MLoc.set(MI->getOperand(0).getReg());
1342 MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
1343 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1345 if (MI->getOperand(0).isImm())
1346 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getImm());
1347 if (MI->getOperand(0).isFPImm())
1348 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getFPImm());
1349 if (MI->getOperand(0).isCImm())
1350 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getCImm());
1352 llvm_unreachable("Unexpected 3 operand DBG_VALUE instruction!");
1355 // Find variables for each lexical scope.
1357 DwarfDebug::collectVariableInfo(const MachineFunction *MF,
1358 SmallPtrSet<const MDNode *, 16> &Processed) {
1360 // Grab the variable info that was squirreled away in the MMI side-table.
1361 collectVariableInfoFromMMITable(MF, Processed);
1363 for (SmallVectorImpl<const MDNode*>::const_iterator
1364 UVI = UserVariables.begin(), UVE = UserVariables.end(); UVI != UVE;
1366 const MDNode *Var = *UVI;
1367 if (Processed.count(Var))
1370 // History contains relevant DBG_VALUE instructions for Var and instructions
1372 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1373 if (History.empty())
1375 const MachineInstr *MInsn = History.front();
1378 LexicalScope *Scope = NULL;
1379 if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
1380 DISubprogram(DV.getContext()).describes(MF->getFunction()))
1381 Scope = LScopes.getCurrentFunctionScope();
1382 else if (MDNode *IA = DV.getInlinedAt())
1383 Scope = LScopes.findInlinedScope(DebugLoc::getFromDILocation(IA));
1385 Scope = LScopes.findLexicalScope(cast<MDNode>(DV->getOperand(1)));
1386 // If variable scope is not found then skip this variable.
1390 Processed.insert(DV);
1391 assert(MInsn->isDebugValue() && "History must begin with debug value");
1392 DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc());
1393 DbgVariable *RegVar = new DbgVariable(DV, AbsVar);
1394 if (!addCurrentFnArgument(MF, RegVar, Scope))
1395 addScopeVariable(Scope, RegVar);
1397 AbsVar->setMInsn(MInsn);
1399 // Simplify ranges that are fully coalesced.
1400 if (History.size() <= 1 || (History.size() == 2 &&
1401 MInsn->isIdenticalTo(History.back()))) {
1402 RegVar->setMInsn(MInsn);
1406 // Handle multiple DBG_VALUE instructions describing one variable.
1407 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1409 for (SmallVectorImpl<const MachineInstr*>::const_iterator
1410 HI = History.begin(), HE = History.end(); HI != HE; ++HI) {
1411 const MachineInstr *Begin = *HI;
1412 assert(Begin->isDebugValue() && "Invalid History entry");
1414 // Check if DBG_VALUE is truncating a range.
1415 if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg()
1416 && !Begin->getOperand(0).getReg())
1419 // Compute the range for a register location.
1420 const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
1421 const MCSymbol *SLabel = 0;
1424 // If Begin is the last instruction in History then its value is valid
1425 // until the end of the function.
1426 SLabel = FunctionEndSym;
1428 const MachineInstr *End = HI[1];
1429 DEBUG(dbgs() << "DotDebugLoc Pair:\n"
1430 << "\t" << *Begin << "\t" << *End << "\n");
1431 if (End->isDebugValue())
1432 SLabel = getLabelBeforeInsn(End);
1434 // End is a normal instruction clobbering the range.
1435 SLabel = getLabelAfterInsn(End);
1436 assert(SLabel && "Forgot label after clobber instruction");
1441 // The value is valid until the next DBG_VALUE or clobber.
1442 DotDebugLocEntries.push_back(getDebugLocEntry(Asm, FLabel, SLabel,
1445 DotDebugLocEntries.push_back(DotDebugLocEntry());
1448 // Collect info for variables that were optimized out.
1449 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1450 DIArray Variables = DISubprogram(FnScope->getScopeNode()).getVariables();
1451 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1452 DIVariable DV(Variables.getElement(i));
1453 if (!DV || !DV.isVariable() || !Processed.insert(DV))
1455 if (LexicalScope *Scope = LScopes.findLexicalScope(DV.getContext()))
1456 addScopeVariable(Scope, new DbgVariable(DV, NULL));
1460 // Return Label preceding the instruction.
1461 MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1462 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1463 assert(Label && "Didn't insert label before instruction");
1467 // Return Label immediately following the instruction.
1468 MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1469 return LabelsAfterInsn.lookup(MI);
1472 // Process beginning of an instruction.
1473 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1474 // Check if source location changes, but ignore DBG_VALUE locations.
1475 if (!MI->isDebugValue()) {
1476 DebugLoc DL = MI->getDebugLoc();
1477 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1480 if (DL == PrologEndLoc) {
1481 Flags |= DWARF2_FLAG_PROLOGUE_END;
1482 PrologEndLoc = DebugLoc();
1484 if (PrologEndLoc.isUnknown())
1485 Flags |= DWARF2_FLAG_IS_STMT;
1487 if (!DL.isUnknown()) {
1488 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1489 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1491 recordSourceLine(0, 0, 0, 0);
1495 // Insert labels where requested.
1496 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1497 LabelsBeforeInsn.find(MI);
1500 if (I == LabelsBeforeInsn.end())
1503 // Label already assigned.
1508 PrevLabel = MMI->getContext().CreateTempSymbol();
1509 Asm->OutStreamer.EmitLabel(PrevLabel);
1511 I->second = PrevLabel;
1514 // Process end of an instruction.
1515 void DwarfDebug::endInstruction(const MachineInstr *MI) {
1516 // Don't create a new label after DBG_VALUE instructions.
1517 // They don't generate code.
1518 if (!MI->isDebugValue())
1521 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1522 LabelsAfterInsn.find(MI);
1525 if (I == LabelsAfterInsn.end())
1528 // Label already assigned.
1532 // We need a label after this instruction.
1534 PrevLabel = MMI->getContext().CreateTempSymbol();
1535 Asm->OutStreamer.EmitLabel(PrevLabel);
1537 I->second = PrevLabel;
1540 // Each LexicalScope has first instruction and last instruction to mark
1541 // beginning and end of a scope respectively. Create an inverse map that list
1542 // scopes starts (and ends) with an instruction. One instruction may start (or
1543 // end) multiple scopes. Ignore scopes that are not reachable.
1544 void DwarfDebug::identifyScopeMarkers() {
1545 SmallVector<LexicalScope *, 4> WorkList;
1546 WorkList.push_back(LScopes.getCurrentFunctionScope());
1547 while (!WorkList.empty()) {
1548 LexicalScope *S = WorkList.pop_back_val();
1550 const SmallVectorImpl<LexicalScope *> &Children = S->getChildren();
1551 if (!Children.empty())
1552 for (SmallVectorImpl<LexicalScope *>::const_iterator SI = Children.begin(),
1553 SE = Children.end(); SI != SE; ++SI)
1554 WorkList.push_back(*SI);
1556 if (S->isAbstractScope())
1559 const SmallVectorImpl<InsnRange> &Ranges = S->getRanges();
1562 for (SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin(),
1563 RE = Ranges.end(); RI != RE; ++RI) {
1564 assert(RI->first && "InsnRange does not have first instruction!");
1565 assert(RI->second && "InsnRange does not have second instruction!");
1566 requestLabelBeforeInsn(RI->first);
1567 requestLabelAfterInsn(RI->second);
1572 // Get MDNode for DebugLoc's scope.
1573 static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
1574 if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
1575 return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
1576 return DL.getScope(Ctx);
1579 // Walk up the scope chain of given debug loc and find line number info
1580 // for the function.
1581 static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
1582 const MDNode *Scope = getScopeNode(DL, Ctx);
1583 DISubprogram SP = getDISubprogram(Scope);
1584 if (SP.isSubprogram()) {
1585 // Check for number of operands since the compatibility is
1587 if (SP->getNumOperands() > 19)
1588 return DebugLoc::get(SP.getScopeLineNumber(), 0, SP);
1590 return DebugLoc::get(SP.getLineNumber(), 0, SP);
1596 // Gather pre-function debug information. Assumes being called immediately
1597 // after the function entry point has been emitted.
1598 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1599 if (!MMI->hasDebugInfo()) return;
1600 LScopes.initialize(*MF);
1601 if (LScopes.empty()) return;
1602 identifyScopeMarkers();
1604 // Set DwarfCompileUnitID in MCContext to the Compile Unit this function
1606 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1607 CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1608 assert(TheCU && "Unable to find compile unit!");
1609 if (Asm->TM.hasMCUseLoc() &&
1610 Asm->OutStreamer.getKind() == MCStreamer::SK_AsmStreamer)
1611 // Use a single line table if we are using .loc and generating assembly.
1612 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1614 Asm->OutStreamer.getContext().setDwarfCompileUnitID(TheCU->getUniqueID());
1616 FunctionBeginSym = Asm->GetTempSymbol("func_begin",
1617 Asm->getFunctionNumber());
1618 // Assumes in correct section after the entry point.
1619 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1621 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
1623 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1624 // LiveUserVar - Map physreg numbers to the MDNode they contain.
1625 std::vector<const MDNode*> LiveUserVar(TRI->getNumRegs());
1627 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1629 bool AtBlockEntry = true;
1630 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1632 const MachineInstr *MI = II;
1634 if (MI->isDebugValue()) {
1635 assert(MI->getNumOperands() > 1 && "Invalid machine instruction!");
1637 // Keep track of user variables.
1639 MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1641 // Variable is in a register, we need to check for clobbers.
1642 if (isDbgValueInDefinedReg(MI))
1643 LiveUserVar[MI->getOperand(0).getReg()] = Var;
1645 // Check the history of this variable.
1646 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1647 if (History.empty()) {
1648 UserVariables.push_back(Var);
1649 // The first mention of a function argument gets the FunctionBeginSym
1650 // label, so arguments are visible when breaking at function entry.
1652 if (DV.isVariable() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
1653 DISubprogram(getDISubprogram(DV.getContext()))
1654 .describes(MF->getFunction()))
1655 LabelsBeforeInsn[MI] = FunctionBeginSym;
1657 // We have seen this variable before. Try to coalesce DBG_VALUEs.
1658 const MachineInstr *Prev = History.back();
1659 if (Prev->isDebugValue()) {
1660 // Coalesce identical entries at the end of History.
1661 if (History.size() >= 2 &&
1662 Prev->isIdenticalTo(History[History.size() - 2])) {
1663 DEBUG(dbgs() << "Coalescing identical DBG_VALUE entries:\n"
1665 << "\t" << *History[History.size() - 2] << "\n");
1669 // Terminate old register assignments that don't reach MI;
1670 MachineFunction::const_iterator PrevMBB = Prev->getParent();
1671 if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
1672 isDbgValueInDefinedReg(Prev)) {
1673 // Previous register assignment needs to terminate at the end of
1675 MachineBasicBlock::const_iterator LastMI =
1676 PrevMBB->getLastNonDebugInstr();
1677 if (LastMI == PrevMBB->end()) {
1678 // Drop DBG_VALUE for empty range.
1679 DEBUG(dbgs() << "Dropping DBG_VALUE for empty range:\n"
1680 << "\t" << *Prev << "\n");
1682 } else if (llvm::next(PrevMBB) != PrevMBB->getParent()->end())
1683 // Terminate after LastMI.
1684 History.push_back(LastMI);
1688 History.push_back(MI);
1690 // Not a DBG_VALUE instruction.
1692 AtBlockEntry = false;
1694 // First known non-DBG_VALUE and non-frame setup location marks
1695 // the beginning of the function body.
1696 if (!MI->getFlag(MachineInstr::FrameSetup) &&
1697 (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown()))
1698 PrologEndLoc = MI->getDebugLoc();
1700 // Check if the instruction clobbers any registers with debug vars.
1701 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
1702 MOE = MI->operands_end(); MOI != MOE; ++MOI) {
1703 if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
1705 for (MCRegAliasIterator AI(MOI->getReg(), TRI, true);
1706 AI.isValid(); ++AI) {
1708 const MDNode *Var = LiveUserVar[Reg];
1711 // Reg is now clobbered.
1712 LiveUserVar[Reg] = 0;
1714 // Was MD last defined by a DBG_VALUE referring to Reg?
1715 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
1716 if (HistI == DbgValues.end())
1718 SmallVectorImpl<const MachineInstr*> &History = HistI->second;
1719 if (History.empty())
1721 const MachineInstr *Prev = History.back();
1722 // Sanity-check: Register assignments are terminated at the end of
1724 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
1726 // Is the variable still in Reg?
1727 if (!isDbgValueInDefinedReg(Prev) ||
1728 Prev->getOperand(0).getReg() != Reg)
1730 // Var is clobbered. Make sure the next instruction gets a label.
1731 History.push_back(MI);
1738 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
1740 SmallVectorImpl<const MachineInstr*> &History = I->second;
1741 if (History.empty())
1744 // Make sure the final register assignments are terminated.
1745 const MachineInstr *Prev = History.back();
1746 if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
1747 const MachineBasicBlock *PrevMBB = Prev->getParent();
1748 MachineBasicBlock::const_iterator LastMI =
1749 PrevMBB->getLastNonDebugInstr();
1750 if (LastMI == PrevMBB->end())
1751 // Drop DBG_VALUE for empty range.
1753 else if (PrevMBB != &PrevMBB->getParent()->back()) {
1754 // Terminate after LastMI.
1755 History.push_back(LastMI);
1758 // Request labels for the full history.
1759 for (unsigned i = 0, e = History.size(); i != e; ++i) {
1760 const MachineInstr *MI = History[i];
1761 if (MI->isDebugValue())
1762 requestLabelBeforeInsn(MI);
1764 requestLabelAfterInsn(MI);
1768 PrevInstLoc = DebugLoc();
1769 PrevLabel = FunctionBeginSym;
1771 // Record beginning of function.
1772 if (!PrologEndLoc.isUnknown()) {
1773 DebugLoc FnStartDL = getFnDebugLoc(PrologEndLoc,
1774 MF->getFunction()->getContext());
1775 recordSourceLine(FnStartDL.getLine(), FnStartDL.getCol(),
1776 FnStartDL.getScope(MF->getFunction()->getContext()),
1777 // We'd like to list the prologue as "not statements" but GDB behaves
1778 // poorly if we do that. Revisit this with caution/GDB (7.5+) testing.
1779 DWARF2_FLAG_IS_STMT);
1783 void DwarfDebug::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
1784 SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
1785 DIVariable DV = Var->getVariable();
1786 // Variables with positive arg numbers are parameters.
1787 if (unsigned ArgNum = DV.getArgNumber()) {
1788 // Keep all parameters in order at the start of the variable list to ensure
1789 // function types are correct (no out-of-order parameters)
1791 // This could be improved by only doing it for optimized builds (unoptimized
1792 // builds have the right order to begin with), searching from the back (this
1793 // would catch the unoptimized case quickly), or doing a binary search
1794 // rather than linear search.
1795 SmallVectorImpl<DbgVariable *>::iterator I = Vars.begin();
1796 while (I != Vars.end()) {
1797 unsigned CurNum = (*I)->getVariable().getArgNumber();
1798 // A local (non-parameter) variable has been found, insert immediately
1802 // A later indexed parameter has been found, insert immediately before it.
1803 if (CurNum > ArgNum)
1807 Vars.insert(I, Var);
1811 Vars.push_back(Var);
1814 // Gather and emit post-function debug information.
1815 void DwarfDebug::endFunction(const MachineFunction *MF) {
1816 if (!MMI->hasDebugInfo() || LScopes.empty()) return;
1818 // Define end label for subprogram.
1819 FunctionEndSym = Asm->GetTempSymbol("func_end",
1820 Asm->getFunctionNumber());
1821 // Assumes in correct section after the entry point.
1822 Asm->OutStreamer.EmitLabel(FunctionEndSym);
1823 // Set DwarfCompileUnitID in MCContext to default value.
1824 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1826 SmallPtrSet<const MDNode *, 16> ProcessedVars;
1827 collectVariableInfo(MF, ProcessedVars);
1829 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1830 CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1831 assert(TheCU && "Unable to find compile unit!");
1833 // Construct abstract scopes.
1834 ArrayRef<LexicalScope *> AList = LScopes.getAbstractScopesList();
1835 for (unsigned i = 0, e = AList.size(); i != e; ++i) {
1836 LexicalScope *AScope = AList[i];
1837 DISubprogram SP(AScope->getScopeNode());
1838 if (SP.isSubprogram()) {
1839 // Collect info for variables that were optimized out.
1840 DIArray Variables = SP.getVariables();
1841 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1842 DIVariable DV(Variables.getElement(i));
1843 if (!DV || !DV.isVariable() || !ProcessedVars.insert(DV))
1845 // Check that DbgVariable for DV wasn't created earlier, when
1846 // findAbstractVariable() was called for inlined instance of DV.
1847 LLVMContext &Ctx = DV->getContext();
1848 DIVariable CleanDV = cleanseInlinedVariable(DV, Ctx);
1849 if (AbstractVariables.lookup(CleanDV))
1851 if (LexicalScope *Scope = LScopes.findAbstractScope(DV.getContext()))
1852 addScopeVariable(Scope, new DbgVariable(DV, NULL));
1855 if (ProcessedSPNodes.count(AScope->getScopeNode()) == 0)
1856 constructScopeDIE(TheCU, AScope);
1859 DIE *CurFnDIE = constructScopeDIE(TheCU, FnScope);
1861 if (!MF->getTarget().Options.DisableFramePointerElim(*MF))
1862 TheCU->addFlag(CurFnDIE, dwarf::DW_AT_APPLE_omit_frame_ptr);
1865 for (ScopeVariablesMap::iterator
1866 I = ScopeVariables.begin(), E = ScopeVariables.end(); I != E; ++I)
1867 DeleteContainerPointers(I->second);
1868 ScopeVariables.clear();
1869 DeleteContainerPointers(CurrentFnArguments);
1870 UserVariables.clear();
1872 AbstractVariables.clear();
1873 LabelsBeforeInsn.clear();
1874 LabelsAfterInsn.clear();
1878 // Register a source line with debug info. Returns the unique label that was
1879 // emitted and which provides correspondence to the source line list.
1880 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
1886 DIDescriptor Scope(S);
1888 if (Scope.isCompileUnit()) {
1889 DICompileUnit CU(S);
1890 Fn = CU.getFilename();
1891 Dir = CU.getDirectory();
1892 } else if (Scope.isFile()) {
1894 Fn = F.getFilename();
1895 Dir = F.getDirectory();
1896 } else if (Scope.isSubprogram()) {
1898 Fn = SP.getFilename();
1899 Dir = SP.getDirectory();
1900 } else if (Scope.isLexicalBlockFile()) {
1901 DILexicalBlockFile DBF(S);
1902 Fn = DBF.getFilename();
1903 Dir = DBF.getDirectory();
1904 } else if (Scope.isLexicalBlock()) {
1905 DILexicalBlock DB(S);
1906 Fn = DB.getFilename();
1907 Dir = DB.getDirectory();
1909 llvm_unreachable("Unexpected scope info");
1911 Src = getOrCreateSourceID(Fn, Dir,
1912 Asm->OutStreamer.getContext().getDwarfCompileUnitID());
1914 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0, 0, Fn);
1917 //===----------------------------------------------------------------------===//
1919 //===----------------------------------------------------------------------===//
1921 // Compute the size and offset of a DIE.
1923 DwarfUnits::computeSizeAndOffset(DIE *Die, unsigned Offset) {
1924 // Get the children.
1925 const std::vector<DIE *> &Children = Die->getChildren();
1927 // Record the abbreviation.
1928 assignAbbrevNumber(Die->getAbbrev());
1930 // Get the abbreviation for this DIE.
1931 unsigned AbbrevNumber = Die->getAbbrevNumber();
1932 const DIEAbbrev *Abbrev = Abbreviations->at(AbbrevNumber - 1);
1935 Die->setOffset(Offset);
1937 // Start the size with the size of abbreviation code.
1938 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
1940 const SmallVectorImpl<DIEValue*> &Values = Die->getValues();
1941 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev->getData();
1943 // Size the DIE attribute values.
1944 for (unsigned i = 0, N = Values.size(); i < N; ++i)
1945 // Size attribute value.
1946 Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
1948 // Size the DIE children if any.
1949 if (!Children.empty()) {
1950 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
1951 "Children flag not set");
1953 for (unsigned j = 0, M = Children.size(); j < M; ++j)
1954 Offset = computeSizeAndOffset(Children[j], Offset);
1956 // End of children marker.
1957 Offset += sizeof(int8_t);
1960 Die->setSize(Offset - Die->getOffset());
1964 // Compute the size and offset of all the DIEs.
1965 void DwarfUnits::computeSizeAndOffsets() {
1966 // Offset from the beginning of debug info section.
1967 unsigned SecOffset = 0;
1968 for (SmallVectorImpl<CompileUnit *>::iterator I = CUs.begin(),
1969 E = CUs.end(); I != E; ++I) {
1970 (*I)->setDebugInfoOffset(SecOffset);
1972 sizeof(int32_t) + // Length of Compilation Unit Info
1973 sizeof(int16_t) + // DWARF version number
1974 sizeof(int32_t) + // Offset Into Abbrev. Section
1975 sizeof(int8_t); // Pointer Size (in bytes)
1977 unsigned EndOffset = computeSizeAndOffset((*I)->getCUDie(), Offset);
1978 SecOffset += EndOffset;
1982 // Emit initial Dwarf sections with a label at the start of each one.
1983 void DwarfDebug::emitSectionLabels() {
1984 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1986 // Dwarf sections base addresses.
1987 DwarfInfoSectionSym =
1988 emitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
1989 DwarfAbbrevSectionSym =
1990 emitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
1991 if (useSplitDwarf())
1992 DwarfAbbrevDWOSectionSym =
1993 emitSectionSym(Asm, TLOF.getDwarfAbbrevDWOSection(),
1994 "section_abbrev_dwo");
1995 emitSectionSym(Asm, TLOF.getDwarfARangesSection());
1997 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
1998 emitSectionSym(Asm, MacroInfo);
2000 DwarfLineSectionSym =
2001 emitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
2002 emitSectionSym(Asm, TLOF.getDwarfLocSection());
2003 if (GenerateGnuPubSections) {
2004 DwarfGnuPubNamesSectionSym =
2005 emitSectionSym(Asm, TLOF.getDwarfGnuPubNamesSection());
2006 DwarfGnuPubTypesSectionSym =
2007 emitSectionSym(Asm, TLOF.getDwarfGnuPubTypesSection());
2008 } else if (HasDwarfPubSections) {
2009 emitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
2010 emitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
2013 DwarfStrSectionSym =
2014 emitSectionSym(Asm, TLOF.getDwarfStrSection(), "info_string");
2015 if (useSplitDwarf()) {
2016 DwarfStrDWOSectionSym =
2017 emitSectionSym(Asm, TLOF.getDwarfStrDWOSection(), "skel_string");
2018 DwarfAddrSectionSym =
2019 emitSectionSym(Asm, TLOF.getDwarfAddrSection(), "addr_sec");
2021 DwarfDebugRangeSectionSym = emitSectionSym(Asm, TLOF.getDwarfRangesSection(),
2024 DwarfDebugLocSectionSym = emitSectionSym(Asm, TLOF.getDwarfLocSection(),
2025 "section_debug_loc");
2027 TextSectionSym = emitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
2028 emitSectionSym(Asm, TLOF.getDataSection());
2031 // Recursively emits a debug information entry.
2032 void DwarfDebug::emitDIE(DIE *Die, std::vector<DIEAbbrev *> *Abbrevs) {
2033 // Get the abbreviation for this DIE.
2034 unsigned AbbrevNumber = Die->getAbbrevNumber();
2035 const DIEAbbrev *Abbrev = Abbrevs->at(AbbrevNumber - 1);
2037 // Emit the code (index) for the abbreviation.
2038 if (Asm->isVerbose())
2039 Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
2040 Twine::utohexstr(Die->getOffset()) + ":0x" +
2041 Twine::utohexstr(Die->getSize()) + " " +
2042 dwarf::TagString(Abbrev->getTag()));
2043 Asm->EmitULEB128(AbbrevNumber);
2045 const SmallVectorImpl<DIEValue*> &Values = Die->getValues();
2046 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev->getData();
2048 // Emit the DIE attribute values.
2049 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2050 unsigned Attr = AbbrevData[i].getAttribute();
2051 unsigned Form = AbbrevData[i].getForm();
2052 assert(Form && "Too many attributes for DIE (check abbreviation)");
2054 if (Asm->isVerbose())
2055 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
2058 case dwarf::DW_AT_abstract_origin: {
2059 DIEEntry *E = cast<DIEEntry>(Values[i]);
2060 DIE *Origin = E->getEntry();
2061 unsigned Addr = Origin->getOffset();
2062 if (Form == dwarf::DW_FORM_ref_addr) {
2063 // For DW_FORM_ref_addr, output the offset from beginning of debug info
2064 // section. Origin->getOffset() returns the offset from start of the
2066 DwarfUnits &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2067 Addr += Holder.getCUOffset(Origin->getCompileUnit());
2069 Asm->OutStreamer.EmitIntValue(Addr,
2070 Form == dwarf::DW_FORM_ref_addr ? DIEEntry::getRefAddrSize(Asm) : 4);
2073 case dwarf::DW_AT_ranges: {
2074 // DW_AT_range Value encodes offset in debug_range section.
2075 DIEInteger *V = cast<DIEInteger>(Values[i]);
2077 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections()) {
2078 Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym,
2082 Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
2084 DwarfDebugRangeSectionSym,
2089 case dwarf::DW_AT_location: {
2090 if (DIELabel *L = dyn_cast<DIELabel>(Values[i])) {
2091 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2092 Asm->EmitLabelReference(L->getValue(), 4);
2094 Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
2096 Values[i]->EmitValue(Asm, Form);
2100 case dwarf::DW_AT_accessibility: {
2101 if (Asm->isVerbose()) {
2102 DIEInteger *V = cast<DIEInteger>(Values[i]);
2103 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
2105 Values[i]->EmitValue(Asm, Form);
2109 // Emit an attribute using the defined form.
2110 Values[i]->EmitValue(Asm, Form);
2115 // Emit the DIE children if any.
2116 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
2117 const std::vector<DIE *> &Children = Die->getChildren();
2119 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2120 emitDIE(Children[j], Abbrevs);
2122 if (Asm->isVerbose())
2123 Asm->OutStreamer.AddComment("End Of Children Mark");
2128 // Emit the various dwarf units to the unit section USection with
2129 // the abbreviations going into ASection.
2130 void DwarfUnits::emitUnits(DwarfDebug *DD,
2131 const MCSection *USection,
2132 const MCSection *ASection,
2133 const MCSymbol *ASectionSym) {
2134 Asm->OutStreamer.SwitchSection(USection);
2135 for (SmallVectorImpl<CompileUnit *>::iterator I = CUs.begin(),
2136 E = CUs.end(); I != E; ++I) {
2137 CompileUnit *TheCU = *I;
2138 DIE *Die = TheCU->getCUDie();
2140 // Emit the compile units header.
2142 .EmitLabel(Asm->GetTempSymbol(USection->getLabelBeginName(),
2143 TheCU->getUniqueID()));
2145 // Emit size of content not including length itself
2146 unsigned ContentSize = Die->getSize() +
2147 sizeof(int16_t) + // DWARF version number
2148 sizeof(int32_t) + // Offset Into Abbrev. Section
2149 sizeof(int8_t); // Pointer Size (in bytes)
2151 Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
2152 Asm->EmitInt32(ContentSize);
2153 Asm->OutStreamer.AddComment("DWARF version number");
2154 Asm->EmitInt16(DD->getDwarfVersion());
2155 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
2156 Asm->EmitSectionOffset(Asm->GetTempSymbol(ASection->getLabelBeginName()),
2158 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2159 Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
2161 DD->emitDIE(Die, Abbreviations);
2162 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol(USection->getLabelEndName(),
2163 TheCU->getUniqueID()));
2167 /// For a given compile unit DIE, returns offset from beginning of debug info.
2168 unsigned DwarfUnits::getCUOffset(DIE *Die) {
2169 assert(Die->getTag() == dwarf::DW_TAG_compile_unit &&
2170 "Input DIE should be compile unit in getCUOffset.");
2171 for (SmallVectorImpl<CompileUnit *>::iterator I = CUs.begin(), E = CUs.end();
2173 CompileUnit *TheCU = *I;
2174 if (TheCU->getCUDie() == Die)
2175 return TheCU->getDebugInfoOffset();
2177 llvm_unreachable("The compile unit DIE should belong to CUs in DwarfUnits.");
2180 // Emit the debug info section.
2181 void DwarfDebug::emitDebugInfo() {
2182 DwarfUnits &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2184 Holder.emitUnits(this, Asm->getObjFileLowering().getDwarfInfoSection(),
2185 Asm->getObjFileLowering().getDwarfAbbrevSection(),
2186 DwarfAbbrevSectionSym);
2189 // Emit the abbreviation section.
2190 void DwarfDebug::emitAbbreviations() {
2191 if (!useSplitDwarf())
2192 emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection(),
2195 emitSkeletonAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection());
2198 void DwarfDebug::emitAbbrevs(const MCSection *Section,
2199 std::vector<DIEAbbrev *> *Abbrevs) {
2200 // Check to see if it is worth the effort.
2201 if (!Abbrevs->empty()) {
2202 // Start the debug abbrev section.
2203 Asm->OutStreamer.SwitchSection(Section);
2205 MCSymbol *Begin = Asm->GetTempSymbol(Section->getLabelBeginName());
2206 Asm->OutStreamer.EmitLabel(Begin);
2208 // For each abbrevation.
2209 for (unsigned i = 0, N = Abbrevs->size(); i < N; ++i) {
2210 // Get abbreviation data
2211 const DIEAbbrev *Abbrev = Abbrevs->at(i);
2213 // Emit the abbrevations code (base 1 index.)
2214 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
2216 // Emit the abbreviations data.
2220 // Mark end of abbreviations.
2221 Asm->EmitULEB128(0, "EOM(3)");
2223 MCSymbol *End = Asm->GetTempSymbol(Section->getLabelEndName());
2224 Asm->OutStreamer.EmitLabel(End);
2228 // Emit the last address of the section and the end of the line matrix.
2229 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
2230 // Define last address of section.
2231 Asm->OutStreamer.AddComment("Extended Op");
2234 Asm->OutStreamer.AddComment("Op size");
2235 Asm->EmitInt8(Asm->getDataLayout().getPointerSize() + 1);
2236 Asm->OutStreamer.AddComment("DW_LNE_set_address");
2237 Asm->EmitInt8(dwarf::DW_LNE_set_address);
2239 Asm->OutStreamer.AddComment("Section end label");
2241 Asm->OutStreamer.EmitSymbolValue(Asm->GetTempSymbol("section_end",SectionEnd),
2242 Asm->getDataLayout().getPointerSize());
2244 // Mark end of matrix.
2245 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
2251 // Emit visible names into a hashed accelerator table section.
2252 void DwarfDebug::emitAccelNames() {
2253 DwarfAccelTable AT(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2254 dwarf::DW_FORM_data4));
2255 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2256 E = CUMap.end(); I != E; ++I) {
2257 CompileUnit *TheCU = I->second;
2258 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelNames();
2259 for (StringMap<std::vector<DIE*> >::const_iterator
2260 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2261 StringRef Name = GI->getKey();
2262 const std::vector<DIE *> &Entities = GI->second;
2263 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
2264 DE = Entities.end(); DI != DE; ++DI)
2265 AT.AddName(Name, (*DI));
2269 AT.FinalizeTable(Asm, "Names");
2270 Asm->OutStreamer.SwitchSection(
2271 Asm->getObjFileLowering().getDwarfAccelNamesSection());
2272 MCSymbol *SectionBegin = Asm->GetTempSymbol("names_begin");
2273 Asm->OutStreamer.EmitLabel(SectionBegin);
2275 // Emit the full data.
2276 AT.Emit(Asm, SectionBegin, &InfoHolder);
2279 // Emit objective C classes and categories into a hashed accelerator table
2281 void DwarfDebug::emitAccelObjC() {
2282 DwarfAccelTable AT(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2283 dwarf::DW_FORM_data4));
2284 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2285 E = CUMap.end(); I != E; ++I) {
2286 CompileUnit *TheCU = I->second;
2287 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelObjC();
2288 for (StringMap<std::vector<DIE*> >::const_iterator
2289 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2290 StringRef Name = GI->getKey();
2291 const std::vector<DIE *> &Entities = GI->second;
2292 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
2293 DE = Entities.end(); DI != DE; ++DI)
2294 AT.AddName(Name, (*DI));
2298 AT.FinalizeTable(Asm, "ObjC");
2299 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
2300 .getDwarfAccelObjCSection());
2301 MCSymbol *SectionBegin = Asm->GetTempSymbol("objc_begin");
2302 Asm->OutStreamer.EmitLabel(SectionBegin);
2304 // Emit the full data.
2305 AT.Emit(Asm, SectionBegin, &InfoHolder);
2308 // Emit namespace dies into a hashed accelerator table.
2309 void DwarfDebug::emitAccelNamespaces() {
2310 DwarfAccelTable AT(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2311 dwarf::DW_FORM_data4));
2312 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2313 E = CUMap.end(); I != E; ++I) {
2314 CompileUnit *TheCU = I->second;
2315 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelNamespace();
2316 for (StringMap<std::vector<DIE*> >::const_iterator
2317 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2318 StringRef Name = GI->getKey();
2319 const std::vector<DIE *> &Entities = GI->second;
2320 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
2321 DE = Entities.end(); DI != DE; ++DI)
2322 AT.AddName(Name, (*DI));
2326 AT.FinalizeTable(Asm, "namespac");
2327 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
2328 .getDwarfAccelNamespaceSection());
2329 MCSymbol *SectionBegin = Asm->GetTempSymbol("namespac_begin");
2330 Asm->OutStreamer.EmitLabel(SectionBegin);
2332 // Emit the full data.
2333 AT.Emit(Asm, SectionBegin, &InfoHolder);
2336 // Emit type dies into a hashed accelerator table.
2337 void DwarfDebug::emitAccelTypes() {
2338 std::vector<DwarfAccelTable::Atom> Atoms;
2339 Atoms.push_back(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2340 dwarf::DW_FORM_data4));
2341 Atoms.push_back(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_tag,
2342 dwarf::DW_FORM_data2));
2343 Atoms.push_back(DwarfAccelTable::Atom(dwarf::DW_ATOM_type_flags,
2344 dwarf::DW_FORM_data1));
2345 DwarfAccelTable AT(Atoms);
2346 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2347 E = CUMap.end(); I != E; ++I) {
2348 CompileUnit *TheCU = I->second;
2349 const StringMap<std::vector<std::pair<DIE*, unsigned > > > &Names
2350 = TheCU->getAccelTypes();
2351 for (StringMap<std::vector<std::pair<DIE*, unsigned> > >::const_iterator
2352 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2353 StringRef Name = GI->getKey();
2354 const std::vector<std::pair<DIE *, unsigned> > &Entities = GI->second;
2355 for (std::vector<std::pair<DIE *, unsigned> >::const_iterator DI
2356 = Entities.begin(), DE = Entities.end(); DI !=DE; ++DI)
2357 AT.AddName(Name, (*DI).first, (*DI).second);
2361 AT.FinalizeTable(Asm, "types");
2362 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
2363 .getDwarfAccelTypesSection());
2364 MCSymbol *SectionBegin = Asm->GetTempSymbol("types_begin");
2365 Asm->OutStreamer.EmitLabel(SectionBegin);
2367 // Emit the full data.
2368 AT.Emit(Asm, SectionBegin, &InfoHolder);
2371 // Public name handling.
2372 // The format for the various pubnames:
2374 // dwarf pubnames - offset/name pairs where the offset is the offset into the CU
2375 // for the DIE that is named.
2377 // gnu pubnames - offset/index value/name tuples where the offset is the offset
2378 // into the CU and the index value is computed according to the type of value
2379 // for the DIE that is named.
2381 // For type units the offset is the offset of the skeleton DIE. For split dwarf
2382 // it's the offset within the debug_info/debug_types dwo section, however, the
2383 // reference in the pubname header doesn't change.
2385 /// computeIndexValue - Compute the gdb index value for the DIE and CU.
2386 static dwarf::PubIndexEntryDescriptor computeIndexValue(CompileUnit *CU,
2388 dwarf::GDBIndexEntryLinkage Linkage =
2389 Die->findAttribute(dwarf::DW_AT_external) ? dwarf::GIEL_EXTERNAL
2390 : dwarf::GIEL_STATIC;
2392 switch (Die->getTag()) {
2393 case dwarf::DW_TAG_class_type:
2394 case dwarf::DW_TAG_structure_type:
2395 case dwarf::DW_TAG_union_type:
2396 case dwarf::DW_TAG_enumeration_type:
2397 return dwarf::PubIndexEntryDescriptor(
2398 dwarf::GIEK_TYPE, CU->getLanguage() != dwarf::DW_LANG_C_plus_plus
2399 ? dwarf::GIEL_STATIC
2400 : dwarf::GIEL_EXTERNAL);
2401 case dwarf::DW_TAG_typedef:
2402 case dwarf::DW_TAG_base_type:
2403 case dwarf::DW_TAG_subrange_type:
2404 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_TYPE, dwarf::GIEL_STATIC);
2405 case dwarf::DW_TAG_namespace:
2406 return dwarf::GIEK_TYPE;
2407 case dwarf::DW_TAG_subprogram:
2408 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_FUNCTION, Linkage);
2409 case dwarf::DW_TAG_constant:
2410 case dwarf::DW_TAG_variable:
2411 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE, Linkage);
2412 case dwarf::DW_TAG_enumerator:
2413 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE,
2414 dwarf::GIEL_STATIC);
2416 return dwarf::GIEK_NONE;
2420 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
2422 void DwarfDebug::emitDebugPubNames(bool GnuStyle) {
2423 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2424 const MCSection *PSec =
2425 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubNamesSection()
2426 : Asm->getObjFileLowering().getDwarfPubNamesSection();
2428 typedef DenseMap<const MDNode*, CompileUnit*> CUMapType;
2429 for (CUMapType::iterator I = CUMap.begin(), E = CUMap.end(); I != E; ++I) {
2430 CompileUnit *TheCU = I->second;
2431 unsigned ID = TheCU->getUniqueID();
2433 // Start the dwarf pubnames section.
2434 Asm->OutStreamer.SwitchSection(PSec);
2436 // Emit a label so we can reference the beginning of this pubname section.
2438 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("gnu_pubnames",
2439 TheCU->getUniqueID()));
2442 Asm->OutStreamer.AddComment("Length of Public Names Info");
2443 Asm->EmitLabelDifference(Asm->GetTempSymbol("pubnames_end", ID),
2444 Asm->GetTempSymbol("pubnames_begin", ID), 4);
2446 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin", ID));
2448 Asm->OutStreamer.AddComment("DWARF Version");
2449 Asm->EmitInt16(dwarf::DW_PUBNAMES_VERSION);
2451 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2452 Asm->EmitSectionOffset(Asm->GetTempSymbol(ISec->getLabelBeginName(), ID),
2453 DwarfInfoSectionSym);
2455 Asm->OutStreamer.AddComment("Compilation Unit Length");
2456 Asm->EmitLabelDifference(Asm->GetTempSymbol(ISec->getLabelEndName(), ID),
2457 Asm->GetTempSymbol(ISec->getLabelBeginName(), ID),
2460 // Emit the pubnames for this compilation unit.
2461 const StringMap<DIE*> &Globals = TheCU->getGlobalNames();
2462 for (StringMap<DIE*>::const_iterator
2463 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2464 const char *Name = GI->getKeyData();
2465 DIE *Entity = GI->second;
2467 Asm->OutStreamer.AddComment("DIE offset");
2468 Asm->EmitInt32(Entity->getOffset());
2471 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheCU, Entity);
2472 Asm->OutStreamer.AddComment(
2473 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
2474 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
2475 Asm->EmitInt8(Desc.toBits());
2478 if (Asm->isVerbose())
2479 Asm->OutStreamer.AddComment("External Name");
2480 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1));
2483 Asm->OutStreamer.AddComment("End Mark");
2485 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_end", ID));
2489 void DwarfDebug::emitDebugPubTypes(bool GnuStyle) {
2490 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2491 const MCSection *PSec =
2492 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubTypesSection()
2493 : Asm->getObjFileLowering().getDwarfPubTypesSection();
2495 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2498 CompileUnit *TheCU = I->second;
2499 // Start the dwarf pubtypes section.
2500 Asm->OutStreamer.SwitchSection(PSec);
2502 // Emit a label so we can reference the beginning of this pubtype section.
2504 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("gnu_pubtypes",
2505 TheCU->getUniqueID()));
2508 Asm->OutStreamer.AddComment("Length of Public Types Info");
2509 Asm->EmitLabelDifference(
2510 Asm->GetTempSymbol("pubtypes_end", TheCU->getUniqueID()),
2511 Asm->GetTempSymbol("pubtypes_begin", TheCU->getUniqueID()), 4);
2513 Asm->OutStreamer.EmitLabel(
2514 Asm->GetTempSymbol("pubtypes_begin", TheCU->getUniqueID()));
2516 if (Asm->isVerbose())
2517 Asm->OutStreamer.AddComment("DWARF Version");
2518 Asm->EmitInt16(dwarf::DW_PUBTYPES_VERSION);
2520 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2521 Asm->EmitSectionOffset(
2522 Asm->GetTempSymbol(ISec->getLabelBeginName(), TheCU->getUniqueID()),
2523 DwarfInfoSectionSym);
2525 Asm->OutStreamer.AddComment("Compilation Unit Length");
2526 Asm->EmitLabelDifference(
2527 Asm->GetTempSymbol(ISec->getLabelEndName(), TheCU->getUniqueID()),
2528 Asm->GetTempSymbol(ISec->getLabelBeginName(), TheCU->getUniqueID()), 4);
2530 // Emit the pubtypes.
2531 const StringMap<DIE *> &Globals = TheCU->getGlobalTypes();
2532 for (StringMap<DIE *>::const_iterator GI = Globals.begin(),
2535 const char *Name = GI->getKeyData();
2536 DIE *Entity = GI->second;
2538 if (Asm->isVerbose())
2539 Asm->OutStreamer.AddComment("DIE offset");
2540 Asm->EmitInt32(Entity->getOffset());
2543 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheCU, Entity);
2544 Asm->OutStreamer.AddComment(
2545 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
2546 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
2547 Asm->EmitInt8(Desc.toBits());
2550 if (Asm->isVerbose())
2551 Asm->OutStreamer.AddComment("External Name");
2553 // Emit the name with a terminating null byte.
2554 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength() + 1));
2557 Asm->OutStreamer.AddComment("End Mark");
2559 Asm->OutStreamer.EmitLabel(
2560 Asm->GetTempSymbol("pubtypes_end", TheCU->getUniqueID()));
2564 // Emit strings into a string section.
2565 void DwarfUnits::emitStrings(const MCSection *StrSection,
2566 const MCSection *OffsetSection = NULL,
2567 const MCSymbol *StrSecSym = NULL) {
2569 if (StringPool.empty()) return;
2571 // Start the dwarf str section.
2572 Asm->OutStreamer.SwitchSection(StrSection);
2574 // Get all of the string pool entries and put them in an array by their ID so
2575 // we can sort them.
2576 SmallVector<std::pair<unsigned,
2577 StringMapEntry<std::pair<MCSymbol*, unsigned> >*>, 64> Entries;
2579 for (StringMap<std::pair<MCSymbol*, unsigned> >::iterator
2580 I = StringPool.begin(), E = StringPool.end();
2582 Entries.push_back(std::make_pair(I->second.second, &*I));
2584 array_pod_sort(Entries.begin(), Entries.end());
2586 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2587 // Emit a label for reference from debug information entries.
2588 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
2590 // Emit the string itself with a terminating null byte.
2591 Asm->OutStreamer.EmitBytes(StringRef(Entries[i].second->getKeyData(),
2592 Entries[i].second->getKeyLength()+1));
2595 // If we've got an offset section go ahead and emit that now as well.
2596 if (OffsetSection) {
2597 Asm->OutStreamer.SwitchSection(OffsetSection);
2598 unsigned offset = 0;
2599 unsigned size = 4; // FIXME: DWARF64 is 8.
2600 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2601 Asm->OutStreamer.EmitIntValue(offset, size);
2602 offset += Entries[i].second->getKeyLength() + 1;
2607 // Emit strings into a string section.
2608 void DwarfUnits::emitAddresses(const MCSection *AddrSection) {
2610 if (AddressPool.empty()) return;
2612 // Start the dwarf addr section.
2613 Asm->OutStreamer.SwitchSection(AddrSection);
2615 // Order the address pool entries by ID
2616 SmallVector<const MCExpr *, 64> Entries(AddressPool.size());
2618 for (DenseMap<const MCExpr *, unsigned>::iterator I = AddressPool.begin(),
2619 E = AddressPool.end();
2621 Entries[I->second] = I->first;
2623 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2624 // Emit an expression for reference from debug information entries.
2625 if (const MCExpr *Expr = Entries[i])
2626 Asm->OutStreamer.EmitValue(Expr, Asm->getDataLayout().getPointerSize());
2628 Asm->OutStreamer.EmitIntValue(0, Asm->getDataLayout().getPointerSize());
2633 // Emit visible names into a debug str section.
2634 void DwarfDebug::emitDebugStr() {
2635 DwarfUnits &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2636 Holder.emitStrings(Asm->getObjFileLowering().getDwarfStrSection());
2639 // Emit locations into the debug loc section.
2640 void DwarfDebug::emitDebugLoc() {
2641 if (DotDebugLocEntries.empty())
2644 for (SmallVectorImpl<DotDebugLocEntry>::iterator
2645 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2647 DotDebugLocEntry &Entry = *I;
2648 if (I + 1 != DotDebugLocEntries.end())
2652 // Start the dwarf loc section.
2653 Asm->OutStreamer.SwitchSection(
2654 Asm->getObjFileLowering().getDwarfLocSection());
2655 unsigned char Size = Asm->getDataLayout().getPointerSize();
2656 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
2658 for (SmallVectorImpl<DotDebugLocEntry>::iterator
2659 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2660 I != E; ++I, ++index) {
2661 DotDebugLocEntry &Entry = *I;
2662 if (Entry.isMerged()) continue;
2663 if (Entry.isEmpty()) {
2664 Asm->OutStreamer.EmitIntValue(0, Size);
2665 Asm->OutStreamer.EmitIntValue(0, Size);
2666 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
2668 Asm->OutStreamer.EmitSymbolValue(Entry.getBeginSym(), Size);
2669 Asm->OutStreamer.EmitSymbolValue(Entry.getEndSym(), Size);
2670 DIVariable DV(Entry.getVariable());
2671 Asm->OutStreamer.AddComment("Loc expr size");
2672 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
2673 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
2674 Asm->EmitLabelDifference(end, begin, 2);
2675 Asm->OutStreamer.EmitLabel(begin);
2676 if (Entry.isInt()) {
2677 DIBasicType BTy(DV.getType());
2679 (BTy.getEncoding() == dwarf::DW_ATE_signed
2680 || BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
2681 Asm->OutStreamer.AddComment("DW_OP_consts");
2682 Asm->EmitInt8(dwarf::DW_OP_consts);
2683 Asm->EmitSLEB128(Entry.getInt());
2685 Asm->OutStreamer.AddComment("DW_OP_constu");
2686 Asm->EmitInt8(dwarf::DW_OP_constu);
2687 Asm->EmitULEB128(Entry.getInt());
2689 } else if (Entry.isLocation()) {
2690 MachineLocation Loc = Entry.getLoc();
2691 if (!DV.hasComplexAddress())
2693 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2695 // Complex address entry.
2696 unsigned N = DV.getNumAddrElements();
2698 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
2699 if (Loc.getOffset()) {
2701 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2702 Asm->OutStreamer.AddComment("DW_OP_deref");
2703 Asm->EmitInt8(dwarf::DW_OP_deref);
2704 Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
2705 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2706 Asm->EmitSLEB128(DV.getAddrElement(1));
2708 // If first address element is OpPlus then emit
2709 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
2710 MachineLocation TLoc(Loc.getReg(), DV.getAddrElement(1));
2711 Asm->EmitDwarfRegOp(TLoc, DV.isIndirect());
2715 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2718 // Emit remaining complex address elements.
2719 for (; i < N; ++i) {
2720 uint64_t Element = DV.getAddrElement(i);
2721 if (Element == DIBuilder::OpPlus) {
2722 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2723 Asm->EmitULEB128(DV.getAddrElement(++i));
2724 } else if (Element == DIBuilder::OpDeref) {
2726 Asm->EmitInt8(dwarf::DW_OP_deref);
2728 llvm_unreachable("unknown Opcode found in complex address");
2732 // else ... ignore constant fp. There is not any good way to
2733 // to represent them here in dwarf.
2734 Asm->OutStreamer.EmitLabel(end);
2739 struct SymbolCUSorter {
2740 SymbolCUSorter(const MCStreamer &s) : Streamer(s) {}
2741 const MCStreamer &Streamer;
2743 bool operator() (const SymbolCU &A, const SymbolCU &B) {
2744 unsigned IA = A.Sym ? Streamer.GetSymbolOrder(A.Sym) : 0;
2745 unsigned IB = B.Sym ? Streamer.GetSymbolOrder(B.Sym) : 0;
2747 // Symbols with no order assigned should be placed at the end.
2748 // (e.g. section end labels)
2750 IA = (unsigned)(-1);
2752 IB = (unsigned)(-1);
2757 static bool CUSort(const CompileUnit *A, const CompileUnit *B) {
2758 return (A->getUniqueID() < B->getUniqueID());
2762 const MCSymbol *Start, *End;
2765 // Emit a debug aranges section, containing a CU lookup for any
2766 // address we can tie back to a CU.
2767 void DwarfDebug::emitDebugARanges() {
2768 // Start the dwarf aranges section.
2770 .SwitchSection(Asm->getObjFileLowering().getDwarfARangesSection());
2772 typedef DenseMap<CompileUnit *, std::vector<ArangeSpan> > SpansType;
2776 // Build a list of sections used.
2777 std::vector<const MCSection *> Sections;
2778 for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
2780 const MCSection *Section = it->first;
2781 Sections.push_back(Section);
2784 // Sort the sections into order.
2785 // This is only done to ensure consistent output order across different runs.
2786 std::sort(Sections.begin(), Sections.end(), SectionSort);
2788 // Build a set of address spans, sorted by CU.
2789 for (size_t SecIdx=0;SecIdx<Sections.size();SecIdx++) {
2790 const MCSection *Section = Sections[SecIdx];
2791 SmallVector<SymbolCU, 8> &List = SectionMap[Section];
2792 if (List.size() < 2)
2795 // Sort the symbols by offset within the section.
2796 SymbolCUSorter sorter(Asm->OutStreamer);
2797 std::sort(List.begin(), List.end(), sorter);
2799 // If we have no section (e.g. common), just write out
2800 // individual spans for each symbol.
2801 if (Section == NULL) {
2802 for (size_t n = 0; n < List.size(); n++) {
2803 const SymbolCU &Cur = List[n];
2806 Span.Start = Cur.Sym;
2809 Spans[Cur.CU].push_back(Span);
2812 // Build spans between each label.
2813 const MCSymbol *StartSym = List[0].Sym;
2814 for (size_t n = 1; n < List.size(); n++) {
2815 const SymbolCU &Prev = List[n - 1];
2816 const SymbolCU &Cur = List[n];
2818 // Try and build the longest span we can within the same CU.
2819 if (Cur.CU != Prev.CU) {
2821 Span.Start = StartSym;
2823 Spans[Prev.CU].push_back(Span);
2830 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2831 unsigned PtrSize = Asm->getDataLayout().getPointerSize();
2833 // Build a list of CUs used.
2834 std::vector<CompileUnit *> CUs;
2835 for (SpansType::iterator it = Spans.begin(); it != Spans.end(); it++) {
2836 CompileUnit *CU = it->first;
2840 // Sort the CU list (again, to ensure consistent output order).
2841 std::sort(CUs.begin(), CUs.end(), CUSort);
2843 // Emit an arange table for each CU we used.
2844 for (size_t CUIdx=0;CUIdx<CUs.size();CUIdx++) {
2845 CompileUnit *CU = CUs[CUIdx];
2846 std::vector<ArangeSpan> &List = Spans[CU];
2848 // Emit size of content not including length itself.
2849 unsigned ContentSize
2850 = sizeof(int16_t) // DWARF ARange version number
2851 + sizeof(int32_t) // Offset of CU in the .debug_info section
2852 + sizeof(int8_t) // Pointer Size (in bytes)
2853 + sizeof(int8_t); // Segment Size (in bytes)
2855 unsigned TupleSize = PtrSize * 2;
2857 // 7.20 in the Dwarf specs requires the table to be aligned to a tuple.
2858 unsigned Padding = 0;
2859 while (((sizeof(int32_t) + ContentSize + Padding) % TupleSize) != 0)
2862 ContentSize += Padding;
2863 ContentSize += (List.size() + 1) * TupleSize;
2865 // For each compile unit, write the list of spans it covers.
2866 Asm->OutStreamer.AddComment("Length of ARange Set");
2867 Asm->EmitInt32(ContentSize);
2868 Asm->OutStreamer.AddComment("DWARF Arange version number");
2869 Asm->EmitInt16(dwarf::DW_ARANGES_VERSION);
2870 Asm->OutStreamer.AddComment("Offset Into Debug Info Section");
2871 Asm->EmitSectionOffset(
2872 Asm->GetTempSymbol(ISec->getLabelBeginName(), CU->getUniqueID()),
2873 DwarfInfoSectionSym);
2874 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2875 Asm->EmitInt8(PtrSize);
2876 Asm->OutStreamer.AddComment("Segment Size (in bytes)");
2879 for (unsigned n = 0; n < Padding; n++)
2880 Asm->EmitInt8(0xff);
2882 for (unsigned n = 0; n < List.size(); n++) {
2883 const ArangeSpan &Span = List[n];
2884 Asm->EmitLabelReference(Span.Start, PtrSize);
2886 // Calculate the size as being from the span start to it's end.
2888 Asm->EmitLabelDifference(Span.End, Span.Start, PtrSize);
2890 // For symbols without an end marker (e.g. common), we
2891 // write a single arange entry containing just that one symbol.
2892 uint64_t Size = SymSize[Span.Start];
2896 Asm->OutStreamer.EmitIntValue(Size, PtrSize);
2900 Asm->OutStreamer.AddComment("ARange terminator");
2901 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2902 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2906 // Emit visible names into a debug ranges section.
2907 void DwarfDebug::emitDebugRanges() {
2908 // Start the dwarf ranges section.
2910 .SwitchSection(Asm->getObjFileLowering().getDwarfRangesSection());
2911 unsigned char Size = Asm->getDataLayout().getPointerSize();
2912 for (SmallVectorImpl<const MCSymbol *>::iterator
2913 I = DebugRangeSymbols.begin(), E = DebugRangeSymbols.end();
2916 Asm->OutStreamer.EmitSymbolValue(const_cast<MCSymbol*>(*I), Size);
2918 Asm->OutStreamer.EmitIntValue(0, Size);
2922 // Emit visible names into a debug macinfo section.
2923 void DwarfDebug::emitDebugMacInfo() {
2924 if (const MCSection *LineInfo =
2925 Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
2926 // Start the dwarf macinfo section.
2927 Asm->OutStreamer.SwitchSection(LineInfo);
2931 // DWARF5 Experimental Separate Dwarf emitters.
2933 // This DIE has the following attributes: DW_AT_comp_dir, DW_AT_stmt_list,
2934 // DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges, DW_AT_dwo_name, DW_AT_dwo_id,
2935 // DW_AT_ranges_base, DW_AT_addr_base.
2936 CompileUnit *DwarfDebug::constructSkeletonCU(const CompileUnit *CU) {
2938 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
2939 CompileUnit *NewCU = new CompileUnit(CU->getUniqueID(), Die, CU->getNode(),
2940 Asm, this, &SkeletonHolder);
2942 NewCU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name,
2943 DICompileUnit(CU->getNode()).getSplitDebugFilename());
2945 // Relocate to the beginning of the addr_base section, else 0 for the
2946 // beginning of the one for this compile unit.
2947 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2948 NewCU->addLabel(Die, dwarf::DW_AT_GNU_addr_base, dwarf::DW_FORM_sec_offset,
2949 DwarfAddrSectionSym);
2951 NewCU->addUInt(Die, dwarf::DW_AT_GNU_addr_base,
2952 dwarf::DW_FORM_sec_offset, 0);
2954 // 2.17.1 requires that we use DW_AT_low_pc for a single entry point
2955 // into an entity. We're using 0, or a NULL label for this.
2956 NewCU->addUInt(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, 0);
2958 // DW_AT_stmt_list is a offset of line number information for this
2959 // compile unit in debug_line section.
2960 // FIXME: Should handle multiple compile units.
2961 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2962 NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_sec_offset,
2963 DwarfLineSectionSym);
2965 NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_sec_offset, 0);
2967 if (!CompilationDir.empty())
2968 NewCU->addLocalString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
2970 // Flags to let the linker know we have emitted new style pubnames.
2971 if (GenerateGnuPubSections) {
2972 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2973 NewCU->addLabel(Die, dwarf::DW_AT_GNU_pubnames, dwarf::DW_FORM_sec_offset,
2974 Asm->GetTempSymbol("gnu_pubnames", NewCU->getUniqueID()));
2976 NewCU->addDelta(Die, dwarf::DW_AT_GNU_pubnames, dwarf::DW_FORM_data4,
2977 Asm->GetTempSymbol("gnu_pubnames", NewCU->getUniqueID()),
2978 DwarfGnuPubNamesSectionSym);
2980 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2981 NewCU->addLabel(Die, dwarf::DW_AT_GNU_pubtypes, dwarf::DW_FORM_sec_offset,
2982 Asm->GetTempSymbol("gnu_pubtypes", NewCU->getUniqueID()));
2984 NewCU->addDelta(Die, dwarf::DW_AT_GNU_pubtypes, dwarf::DW_FORM_data4,
2985 Asm->GetTempSymbol("gnu_pubtypes", NewCU->getUniqueID()),
2986 DwarfGnuPubTypesSectionSym);
2989 // Flag if we've emitted any ranges and their location for the compile unit.
2990 if (DebugRangeSymbols.size()) {
2991 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2992 NewCU->addLabel(Die, dwarf::DW_AT_GNU_ranges_base,
2993 dwarf::DW_FORM_sec_offset, DwarfDebugRangeSectionSym);
2995 NewCU->addUInt(Die, dwarf::DW_AT_GNU_ranges_base, dwarf::DW_FORM_data4,
2999 SkeletonHolder.addUnit(NewCU);
3000 SkeletonCUs.push_back(NewCU);
3005 void DwarfDebug::emitSkeletonAbbrevs(const MCSection *Section) {
3006 assert(useSplitDwarf() && "No split dwarf debug info?");
3007 emitAbbrevs(Section, &SkeletonAbbrevs);
3010 // Emit the .debug_info.dwo section for separated dwarf. This contains the
3011 // compile units that would normally be in debug_info.
3012 void DwarfDebug::emitDebugInfoDWO() {
3013 assert(useSplitDwarf() && "No split dwarf debug info?");
3014 InfoHolder.emitUnits(this, Asm->getObjFileLowering().getDwarfInfoDWOSection(),
3015 Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
3016 DwarfAbbrevDWOSectionSym);
3019 // Emit the .debug_abbrev.dwo section for separated dwarf. This contains the
3020 // abbreviations for the .debug_info.dwo section.
3021 void DwarfDebug::emitDebugAbbrevDWO() {
3022 assert(useSplitDwarf() && "No split dwarf?");
3023 emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
3027 // Emit the .debug_str.dwo section for separated dwarf. This contains the
3028 // string section and is identical in format to traditional .debug_str
3030 void DwarfDebug::emitDebugStrDWO() {
3031 assert(useSplitDwarf() && "No split dwarf?");
3032 const MCSection *OffSec = Asm->getObjFileLowering()
3033 .getDwarfStrOffDWOSection();
3034 const MCSymbol *StrSym = DwarfStrSectionSym;
3035 InfoHolder.emitStrings(Asm->getObjFileLowering().getDwarfStrDWOSection(),