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 = DD->resolve(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 (DD->resolve(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 = getSPDIE(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 = getSPDIE(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 = getSPDIE(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 = getSPDIE(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, this);
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 // Process the worklist to add attributes with the correct form (ref_addr or
1071 for (unsigned I = 0, E = DIEEntryWorklist.size(); I < E; I++) {
1072 addDIEEntry(DIEEntryWorklist[I].Die, DIEEntryWorklist[I].Attribute,
1073 dwarf::DW_FORM_ref4, DIEEntryWorklist[I].Entry);
1074 assert(E == DIEEntryWorklist.size() &&
1075 "We should not add to the worklist during finalization.");
1078 // Handle anything that needs to be done on a per-cu basis.
1079 for (DenseMap<const MDNode *, CompileUnit *>::iterator CUI = CUMap.begin(),
1081 CUI != CUE; ++CUI) {
1082 CompileUnit *TheCU = CUI->second;
1083 // Emit DW_AT_containing_type attribute to connect types with their
1084 // vtable holding type.
1085 TheCU->constructContainingTypeDIEs();
1087 // If we're splitting the dwarf out now that we've got the entire
1088 // CU then construct a skeleton CU based upon it.
1089 if (useSplitDwarf()) {
1091 if (GenerateCUHash) {
1093 ID = CUHash.computeCUSignature(TheCU->getCUDie());
1095 // This should be a unique identifier when we want to build .dwp files.
1096 TheCU->addUInt(TheCU->getCUDie(), dwarf::DW_AT_GNU_dwo_id,
1097 dwarf::DW_FORM_data8, ID);
1098 // Now construct the skeleton CU associated.
1099 CompileUnit *SkCU = constructSkeletonCU(TheCU);
1100 // This should be a unique identifier when we want to build .dwp files.
1101 SkCU->addUInt(SkCU->getCUDie(), dwarf::DW_AT_GNU_dwo_id,
1102 dwarf::DW_FORM_data8, ID);
1106 // Compute DIE offsets and sizes.
1107 InfoHolder.computeSizeAndOffsets();
1108 if (useSplitDwarf())
1109 SkeletonHolder.computeSizeAndOffsets();
1112 void DwarfDebug::endSections() {
1113 // Filter labels by section.
1114 for (size_t n = 0; n < ArangeLabels.size(); n++) {
1115 const SymbolCU &SCU = ArangeLabels[n];
1116 if (SCU.Sym->isInSection()) {
1117 // Make a note of this symbol and it's section.
1118 const MCSection *Section = &SCU.Sym->getSection();
1119 if (!Section->getKind().isMetadata())
1120 SectionMap[Section].push_back(SCU);
1122 // Some symbols (e.g. common/bss on mach-o) can have no section but still
1123 // appear in the output. This sucks as we rely on sections to build
1124 // arange spans. We can do it without, but it's icky.
1125 SectionMap[NULL].push_back(SCU);
1129 // Build a list of sections used.
1130 std::vector<const MCSection *> Sections;
1131 for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
1133 const MCSection *Section = it->first;
1134 Sections.push_back(Section);
1137 // Sort the sections into order.
1138 // This is only done to ensure consistent output order across different runs.
1139 std::sort(Sections.begin(), Sections.end(), SectionSort);
1141 // Add terminating symbols for each section.
1142 for (unsigned ID=0;ID<Sections.size();ID++) {
1143 const MCSection *Section = Sections[ID];
1144 MCSymbol *Sym = NULL;
1147 // We can't call MCSection::getLabelEndName, as it's only safe to do so
1148 // if we know the section name up-front. For user-created sections, the resulting
1149 // label may not be valid to use as a label. (section names can use a greater
1150 // set of characters on some systems)
1151 Sym = Asm->GetTempSymbol("debug_end", ID);
1152 Asm->OutStreamer.SwitchSection(Section);
1153 Asm->OutStreamer.EmitLabel(Sym);
1156 // Insert a final terminator.
1157 SectionMap[Section].push_back(SymbolCU(NULL, Sym));
1161 // Emit all Dwarf sections that should come after the content.
1162 void DwarfDebug::endModule() {
1164 if (!FirstCU) return;
1166 // End any existing sections.
1167 // TODO: Does this need to happen?
1170 // Finalize the debug info for the module.
1171 finalizeModuleInfo();
1173 if (!useSplitDwarf()) {
1176 // Emit all the DIEs into a debug info section.
1179 // Corresponding abbreviations into a abbrev section.
1180 emitAbbreviations();
1182 // Emit info into a debug loc section.
1185 // Emit info into a debug aranges section.
1188 // Emit info into a debug ranges section.
1191 // Emit info into a debug macinfo section.
1195 // TODO: Fill this in for separated debug sections and separate
1196 // out information into new sections.
1198 if (useSplitDwarf())
1201 // Emit the debug info section and compile units.
1205 // Corresponding abbreviations into a abbrev section.
1206 emitAbbreviations();
1207 emitDebugAbbrevDWO();
1209 // Emit info into a debug loc section.
1212 // Emit info into a debug aranges section.
1215 // Emit info into a debug ranges section.
1218 // Emit info into a debug macinfo section.
1221 // Emit DWO addresses.
1222 InfoHolder.emitAddresses(Asm->getObjFileLowering().getDwarfAddrSection());
1226 // Emit info into the dwarf accelerator table sections.
1227 if (useDwarfAccelTables()) {
1230 emitAccelNamespaces();
1234 // Emit the pubnames and pubtypes sections if requested.
1235 if (HasDwarfPubSections) {
1236 emitDebugPubNames(GenerateGnuPubSections);
1237 emitDebugPubTypes(GenerateGnuPubSections);
1242 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
1243 E = CUMap.end(); I != E; ++I)
1246 for (SmallVectorImpl<CompileUnit *>::iterator I = SkeletonCUs.begin(),
1247 E = SkeletonCUs.end(); I != E; ++I)
1250 // Reset these for the next Module if we have one.
1254 // Find abstract variable, if any, associated with Var.
1255 DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &DV,
1256 DebugLoc ScopeLoc) {
1257 LLVMContext &Ctx = DV->getContext();
1258 // More then one inlined variable corresponds to one abstract variable.
1259 DIVariable Var = cleanseInlinedVariable(DV, Ctx);
1260 DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var);
1262 return AbsDbgVariable;
1264 LexicalScope *Scope = LScopes.findAbstractScope(ScopeLoc.getScope(Ctx));
1268 AbsDbgVariable = new DbgVariable(Var, NULL, this);
1269 addScopeVariable(Scope, AbsDbgVariable);
1270 AbstractVariables[Var] = AbsDbgVariable;
1271 return AbsDbgVariable;
1274 // If Var is a current function argument then add it to CurrentFnArguments list.
1275 bool DwarfDebug::addCurrentFnArgument(const MachineFunction *MF,
1276 DbgVariable *Var, LexicalScope *Scope) {
1277 if (!LScopes.isCurrentFunctionScope(Scope))
1279 DIVariable DV = Var->getVariable();
1280 if (DV.getTag() != dwarf::DW_TAG_arg_variable)
1282 unsigned ArgNo = DV.getArgNumber();
1286 size_t Size = CurrentFnArguments.size();
1288 CurrentFnArguments.resize(MF->getFunction()->arg_size());
1289 // llvm::Function argument size is not good indicator of how many
1290 // arguments does the function have at source level.
1292 CurrentFnArguments.resize(ArgNo * 2);
1293 CurrentFnArguments[ArgNo - 1] = Var;
1297 // Collect variable information from side table maintained by MMI.
1299 DwarfDebug::collectVariableInfoFromMMITable(const MachineFunction *MF,
1300 SmallPtrSet<const MDNode *, 16> &Processed) {
1301 MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
1302 for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
1303 VE = VMap.end(); VI != VE; ++VI) {
1304 const MDNode *Var = VI->first;
1306 Processed.insert(Var);
1308 const std::pair<unsigned, DebugLoc> &VP = VI->second;
1310 LexicalScope *Scope = LScopes.findLexicalScope(VP.second);
1312 // If variable scope is not found then skip this variable.
1316 DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
1317 DbgVariable *RegVar = new DbgVariable(DV, AbsDbgVariable, this);
1318 RegVar->setFrameIndex(VP.first);
1319 if (!addCurrentFnArgument(MF, RegVar, Scope))
1320 addScopeVariable(Scope, RegVar);
1322 AbsDbgVariable->setFrameIndex(VP.first);
1326 // Return true if debug value, encoded by DBG_VALUE instruction, is in a
1328 static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
1329 assert(MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
1330 return MI->getNumOperands() == 3 &&
1331 MI->getOperand(0).isReg() && MI->getOperand(0).getReg() &&
1332 (MI->getOperand(1).isImm() ||
1333 (MI->getOperand(1).isReg() && MI->getOperand(1).getReg() == 0U));
1336 // Get .debug_loc entry for the instruction range starting at MI.
1337 static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
1338 const MCSymbol *FLabel,
1339 const MCSymbol *SLabel,
1340 const MachineInstr *MI) {
1341 const MDNode *Var = MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1343 assert(MI->getNumOperands() == 3);
1344 if (MI->getOperand(0).isReg()) {
1345 MachineLocation MLoc;
1346 // If the second operand is an immediate, this is a
1347 // register-indirect address.
1348 if (!MI->getOperand(1).isImm())
1349 MLoc.set(MI->getOperand(0).getReg());
1351 MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
1352 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1354 if (MI->getOperand(0).isImm())
1355 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getImm());
1356 if (MI->getOperand(0).isFPImm())
1357 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getFPImm());
1358 if (MI->getOperand(0).isCImm())
1359 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getCImm());
1361 llvm_unreachable("Unexpected 3 operand DBG_VALUE instruction!");
1364 // Find variables for each lexical scope.
1366 DwarfDebug::collectVariableInfo(const MachineFunction *MF,
1367 SmallPtrSet<const MDNode *, 16> &Processed) {
1369 // Grab the variable info that was squirreled away in the MMI side-table.
1370 collectVariableInfoFromMMITable(MF, Processed);
1372 for (SmallVectorImpl<const MDNode*>::const_iterator
1373 UVI = UserVariables.begin(), UVE = UserVariables.end(); UVI != UVE;
1375 const MDNode *Var = *UVI;
1376 if (Processed.count(Var))
1379 // History contains relevant DBG_VALUE instructions for Var and instructions
1381 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1382 if (History.empty())
1384 const MachineInstr *MInsn = History.front();
1387 LexicalScope *Scope = NULL;
1388 if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
1389 DISubprogram(DV.getContext()).describes(MF->getFunction()))
1390 Scope = LScopes.getCurrentFunctionScope();
1391 else if (MDNode *IA = DV.getInlinedAt())
1392 Scope = LScopes.findInlinedScope(DebugLoc::getFromDILocation(IA));
1394 Scope = LScopes.findLexicalScope(cast<MDNode>(DV->getOperand(1)));
1395 // If variable scope is not found then skip this variable.
1399 Processed.insert(DV);
1400 assert(MInsn->isDebugValue() && "History must begin with debug value");
1401 DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc());
1402 DbgVariable *RegVar = new DbgVariable(DV, AbsVar, this);
1403 if (!addCurrentFnArgument(MF, RegVar, Scope))
1404 addScopeVariable(Scope, RegVar);
1406 AbsVar->setMInsn(MInsn);
1408 // Simplify ranges that are fully coalesced.
1409 if (History.size() <= 1 || (History.size() == 2 &&
1410 MInsn->isIdenticalTo(History.back()))) {
1411 RegVar->setMInsn(MInsn);
1415 // Handle multiple DBG_VALUE instructions describing one variable.
1416 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1418 for (SmallVectorImpl<const MachineInstr*>::const_iterator
1419 HI = History.begin(), HE = History.end(); HI != HE; ++HI) {
1420 const MachineInstr *Begin = *HI;
1421 assert(Begin->isDebugValue() && "Invalid History entry");
1423 // Check if DBG_VALUE is truncating a range.
1424 if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg()
1425 && !Begin->getOperand(0).getReg())
1428 // Compute the range for a register location.
1429 const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
1430 const MCSymbol *SLabel = 0;
1433 // If Begin is the last instruction in History then its value is valid
1434 // until the end of the function.
1435 SLabel = FunctionEndSym;
1437 const MachineInstr *End = HI[1];
1438 DEBUG(dbgs() << "DotDebugLoc Pair:\n"
1439 << "\t" << *Begin << "\t" << *End << "\n");
1440 if (End->isDebugValue())
1441 SLabel = getLabelBeforeInsn(End);
1443 // End is a normal instruction clobbering the range.
1444 SLabel = getLabelAfterInsn(End);
1445 assert(SLabel && "Forgot label after clobber instruction");
1450 // The value is valid until the next DBG_VALUE or clobber.
1451 DotDebugLocEntries.push_back(getDebugLocEntry(Asm, FLabel, SLabel,
1454 DotDebugLocEntries.push_back(DotDebugLocEntry());
1457 // Collect info for variables that were optimized out.
1458 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1459 DIArray Variables = DISubprogram(FnScope->getScopeNode()).getVariables();
1460 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1461 DIVariable DV(Variables.getElement(i));
1462 if (!DV || !DV.isVariable() || !Processed.insert(DV))
1464 if (LexicalScope *Scope = LScopes.findLexicalScope(DV.getContext()))
1465 addScopeVariable(Scope, new DbgVariable(DV, NULL, this));
1469 // Return Label preceding the instruction.
1470 MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1471 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1472 assert(Label && "Didn't insert label before instruction");
1476 // Return Label immediately following the instruction.
1477 MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1478 return LabelsAfterInsn.lookup(MI);
1481 // Process beginning of an instruction.
1482 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1483 // Check if source location changes, but ignore DBG_VALUE locations.
1484 if (!MI->isDebugValue()) {
1485 DebugLoc DL = MI->getDebugLoc();
1486 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1489 if (DL == PrologEndLoc) {
1490 Flags |= DWARF2_FLAG_PROLOGUE_END;
1491 PrologEndLoc = DebugLoc();
1493 if (PrologEndLoc.isUnknown())
1494 Flags |= DWARF2_FLAG_IS_STMT;
1496 if (!DL.isUnknown()) {
1497 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1498 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1500 recordSourceLine(0, 0, 0, 0);
1504 // Insert labels where requested.
1505 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1506 LabelsBeforeInsn.find(MI);
1509 if (I == LabelsBeforeInsn.end())
1512 // Label already assigned.
1517 PrevLabel = MMI->getContext().CreateTempSymbol();
1518 Asm->OutStreamer.EmitLabel(PrevLabel);
1520 I->second = PrevLabel;
1523 // Process end of an instruction.
1524 void DwarfDebug::endInstruction(const MachineInstr *MI) {
1525 // Don't create a new label after DBG_VALUE instructions.
1526 // They don't generate code.
1527 if (!MI->isDebugValue())
1530 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1531 LabelsAfterInsn.find(MI);
1534 if (I == LabelsAfterInsn.end())
1537 // Label already assigned.
1541 // We need a label after this instruction.
1543 PrevLabel = MMI->getContext().CreateTempSymbol();
1544 Asm->OutStreamer.EmitLabel(PrevLabel);
1546 I->second = PrevLabel;
1549 // Each LexicalScope has first instruction and last instruction to mark
1550 // beginning and end of a scope respectively. Create an inverse map that list
1551 // scopes starts (and ends) with an instruction. One instruction may start (or
1552 // end) multiple scopes. Ignore scopes that are not reachable.
1553 void DwarfDebug::identifyScopeMarkers() {
1554 SmallVector<LexicalScope *, 4> WorkList;
1555 WorkList.push_back(LScopes.getCurrentFunctionScope());
1556 while (!WorkList.empty()) {
1557 LexicalScope *S = WorkList.pop_back_val();
1559 const SmallVectorImpl<LexicalScope *> &Children = S->getChildren();
1560 if (!Children.empty())
1561 for (SmallVectorImpl<LexicalScope *>::const_iterator SI = Children.begin(),
1562 SE = Children.end(); SI != SE; ++SI)
1563 WorkList.push_back(*SI);
1565 if (S->isAbstractScope())
1568 const SmallVectorImpl<InsnRange> &Ranges = S->getRanges();
1571 for (SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin(),
1572 RE = Ranges.end(); RI != RE; ++RI) {
1573 assert(RI->first && "InsnRange does not have first instruction!");
1574 assert(RI->second && "InsnRange does not have second instruction!");
1575 requestLabelBeforeInsn(RI->first);
1576 requestLabelAfterInsn(RI->second);
1581 // Get MDNode for DebugLoc's scope.
1582 static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
1583 if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
1584 return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
1585 return DL.getScope(Ctx);
1588 // Walk up the scope chain of given debug loc and find line number info
1589 // for the function.
1590 static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
1591 const MDNode *Scope = getScopeNode(DL, Ctx);
1592 DISubprogram SP = getDISubprogram(Scope);
1593 if (SP.isSubprogram()) {
1594 // Check for number of operands since the compatibility is
1596 if (SP->getNumOperands() > 19)
1597 return DebugLoc::get(SP.getScopeLineNumber(), 0, SP);
1599 return DebugLoc::get(SP.getLineNumber(), 0, SP);
1605 // Gather pre-function debug information. Assumes being called immediately
1606 // after the function entry point has been emitted.
1607 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1608 if (!MMI->hasDebugInfo()) return;
1609 LScopes.initialize(*MF);
1610 if (LScopes.empty()) return;
1611 identifyScopeMarkers();
1613 // Set DwarfCompileUnitID in MCContext to the Compile Unit this function
1615 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1616 CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1617 assert(TheCU && "Unable to find compile unit!");
1618 if (Asm->TM.hasMCUseLoc() &&
1619 Asm->OutStreamer.getKind() == MCStreamer::SK_AsmStreamer)
1620 // Use a single line table if we are using .loc and generating assembly.
1621 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1623 Asm->OutStreamer.getContext().setDwarfCompileUnitID(TheCU->getUniqueID());
1625 FunctionBeginSym = Asm->GetTempSymbol("func_begin",
1626 Asm->getFunctionNumber());
1627 // Assumes in correct section after the entry point.
1628 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1630 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
1632 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1633 // LiveUserVar - Map physreg numbers to the MDNode they contain.
1634 std::vector<const MDNode*> LiveUserVar(TRI->getNumRegs());
1636 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1638 bool AtBlockEntry = true;
1639 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1641 const MachineInstr *MI = II;
1643 if (MI->isDebugValue()) {
1644 assert(MI->getNumOperands() > 1 && "Invalid machine instruction!");
1646 // Keep track of user variables.
1648 MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1650 // Variable is in a register, we need to check for clobbers.
1651 if (isDbgValueInDefinedReg(MI))
1652 LiveUserVar[MI->getOperand(0).getReg()] = Var;
1654 // Check the history of this variable.
1655 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1656 if (History.empty()) {
1657 UserVariables.push_back(Var);
1658 // The first mention of a function argument gets the FunctionBeginSym
1659 // label, so arguments are visible when breaking at function entry.
1661 if (DV.isVariable() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
1662 DISubprogram(getDISubprogram(DV.getContext()))
1663 .describes(MF->getFunction()))
1664 LabelsBeforeInsn[MI] = FunctionBeginSym;
1666 // We have seen this variable before. Try to coalesce DBG_VALUEs.
1667 const MachineInstr *Prev = History.back();
1668 if (Prev->isDebugValue()) {
1669 // Coalesce identical entries at the end of History.
1670 if (History.size() >= 2 &&
1671 Prev->isIdenticalTo(History[History.size() - 2])) {
1672 DEBUG(dbgs() << "Coalescing identical DBG_VALUE entries:\n"
1674 << "\t" << *History[History.size() - 2] << "\n");
1678 // Terminate old register assignments that don't reach MI;
1679 MachineFunction::const_iterator PrevMBB = Prev->getParent();
1680 if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
1681 isDbgValueInDefinedReg(Prev)) {
1682 // Previous register assignment needs to terminate at the end of
1684 MachineBasicBlock::const_iterator LastMI =
1685 PrevMBB->getLastNonDebugInstr();
1686 if (LastMI == PrevMBB->end()) {
1687 // Drop DBG_VALUE for empty range.
1688 DEBUG(dbgs() << "Dropping DBG_VALUE for empty range:\n"
1689 << "\t" << *Prev << "\n");
1691 } else if (llvm::next(PrevMBB) != PrevMBB->getParent()->end())
1692 // Terminate after LastMI.
1693 History.push_back(LastMI);
1697 History.push_back(MI);
1699 // Not a DBG_VALUE instruction.
1701 AtBlockEntry = false;
1703 // First known non-DBG_VALUE and non-frame setup location marks
1704 // the beginning of the function body.
1705 if (!MI->getFlag(MachineInstr::FrameSetup) &&
1706 (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown()))
1707 PrologEndLoc = MI->getDebugLoc();
1709 // Check if the instruction clobbers any registers with debug vars.
1710 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
1711 MOE = MI->operands_end(); MOI != MOE; ++MOI) {
1712 if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
1714 for (MCRegAliasIterator AI(MOI->getReg(), TRI, true);
1715 AI.isValid(); ++AI) {
1717 const MDNode *Var = LiveUserVar[Reg];
1720 // Reg is now clobbered.
1721 LiveUserVar[Reg] = 0;
1723 // Was MD last defined by a DBG_VALUE referring to Reg?
1724 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
1725 if (HistI == DbgValues.end())
1727 SmallVectorImpl<const MachineInstr*> &History = HistI->second;
1728 if (History.empty())
1730 const MachineInstr *Prev = History.back();
1731 // Sanity-check: Register assignments are terminated at the end of
1733 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
1735 // Is the variable still in Reg?
1736 if (!isDbgValueInDefinedReg(Prev) ||
1737 Prev->getOperand(0).getReg() != Reg)
1739 // Var is clobbered. Make sure the next instruction gets a label.
1740 History.push_back(MI);
1747 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
1749 SmallVectorImpl<const MachineInstr*> &History = I->second;
1750 if (History.empty())
1753 // Make sure the final register assignments are terminated.
1754 const MachineInstr *Prev = History.back();
1755 if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
1756 const MachineBasicBlock *PrevMBB = Prev->getParent();
1757 MachineBasicBlock::const_iterator LastMI =
1758 PrevMBB->getLastNonDebugInstr();
1759 if (LastMI == PrevMBB->end())
1760 // Drop DBG_VALUE for empty range.
1762 else if (PrevMBB != &PrevMBB->getParent()->back()) {
1763 // Terminate after LastMI.
1764 History.push_back(LastMI);
1767 // Request labels for the full history.
1768 for (unsigned i = 0, e = History.size(); i != e; ++i) {
1769 const MachineInstr *MI = History[i];
1770 if (MI->isDebugValue())
1771 requestLabelBeforeInsn(MI);
1773 requestLabelAfterInsn(MI);
1777 PrevInstLoc = DebugLoc();
1778 PrevLabel = FunctionBeginSym;
1780 // Record beginning of function.
1781 if (!PrologEndLoc.isUnknown()) {
1782 DebugLoc FnStartDL = getFnDebugLoc(PrologEndLoc,
1783 MF->getFunction()->getContext());
1784 recordSourceLine(FnStartDL.getLine(), FnStartDL.getCol(),
1785 FnStartDL.getScope(MF->getFunction()->getContext()),
1786 // We'd like to list the prologue as "not statements" but GDB behaves
1787 // poorly if we do that. Revisit this with caution/GDB (7.5+) testing.
1788 DWARF2_FLAG_IS_STMT);
1792 void DwarfDebug::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
1793 SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
1794 DIVariable DV = Var->getVariable();
1795 // Variables with positive arg numbers are parameters.
1796 if (unsigned ArgNum = DV.getArgNumber()) {
1797 // Keep all parameters in order at the start of the variable list to ensure
1798 // function types are correct (no out-of-order parameters)
1800 // This could be improved by only doing it for optimized builds (unoptimized
1801 // builds have the right order to begin with), searching from the back (this
1802 // would catch the unoptimized case quickly), or doing a binary search
1803 // rather than linear search.
1804 SmallVectorImpl<DbgVariable *>::iterator I = Vars.begin();
1805 while (I != Vars.end()) {
1806 unsigned CurNum = (*I)->getVariable().getArgNumber();
1807 // A local (non-parameter) variable has been found, insert immediately
1811 // A later indexed parameter has been found, insert immediately before it.
1812 if (CurNum > ArgNum)
1816 Vars.insert(I, Var);
1820 Vars.push_back(Var);
1823 // Gather and emit post-function debug information.
1824 void DwarfDebug::endFunction(const MachineFunction *MF) {
1825 if (!MMI->hasDebugInfo() || LScopes.empty()) return;
1827 // Define end label for subprogram.
1828 FunctionEndSym = Asm->GetTempSymbol("func_end",
1829 Asm->getFunctionNumber());
1830 // Assumes in correct section after the entry point.
1831 Asm->OutStreamer.EmitLabel(FunctionEndSym);
1832 // Set DwarfCompileUnitID in MCContext to default value.
1833 Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
1835 SmallPtrSet<const MDNode *, 16> ProcessedVars;
1836 collectVariableInfo(MF, ProcessedVars);
1838 LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
1839 CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
1840 assert(TheCU && "Unable to find compile unit!");
1842 // Construct abstract scopes.
1843 ArrayRef<LexicalScope *> AList = LScopes.getAbstractScopesList();
1844 for (unsigned i = 0, e = AList.size(); i != e; ++i) {
1845 LexicalScope *AScope = AList[i];
1846 DISubprogram SP(AScope->getScopeNode());
1847 if (SP.isSubprogram()) {
1848 // Collect info for variables that were optimized out.
1849 DIArray Variables = SP.getVariables();
1850 for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
1851 DIVariable DV(Variables.getElement(i));
1852 if (!DV || !DV.isVariable() || !ProcessedVars.insert(DV))
1854 // Check that DbgVariable for DV wasn't created earlier, when
1855 // findAbstractVariable() was called for inlined instance of DV.
1856 LLVMContext &Ctx = DV->getContext();
1857 DIVariable CleanDV = cleanseInlinedVariable(DV, Ctx);
1858 if (AbstractVariables.lookup(CleanDV))
1860 if (LexicalScope *Scope = LScopes.findAbstractScope(DV.getContext()))
1861 addScopeVariable(Scope, new DbgVariable(DV, NULL, this));
1864 if (ProcessedSPNodes.count(AScope->getScopeNode()) == 0)
1865 constructScopeDIE(TheCU, AScope);
1868 DIE *CurFnDIE = constructScopeDIE(TheCU, FnScope);
1870 if (!MF->getTarget().Options.DisableFramePointerElim(*MF))
1871 TheCU->addFlag(CurFnDIE, dwarf::DW_AT_APPLE_omit_frame_ptr);
1874 for (ScopeVariablesMap::iterator
1875 I = ScopeVariables.begin(), E = ScopeVariables.end(); I != E; ++I)
1876 DeleteContainerPointers(I->second);
1877 ScopeVariables.clear();
1878 DeleteContainerPointers(CurrentFnArguments);
1879 UserVariables.clear();
1881 AbstractVariables.clear();
1882 LabelsBeforeInsn.clear();
1883 LabelsAfterInsn.clear();
1887 // Register a source line with debug info. Returns the unique label that was
1888 // emitted and which provides correspondence to the source line list.
1889 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
1895 DIDescriptor Scope(S);
1897 if (Scope.isCompileUnit()) {
1898 DICompileUnit CU(S);
1899 Fn = CU.getFilename();
1900 Dir = CU.getDirectory();
1901 } else if (Scope.isFile()) {
1903 Fn = F.getFilename();
1904 Dir = F.getDirectory();
1905 } else if (Scope.isSubprogram()) {
1907 Fn = SP.getFilename();
1908 Dir = SP.getDirectory();
1909 } else if (Scope.isLexicalBlockFile()) {
1910 DILexicalBlockFile DBF(S);
1911 Fn = DBF.getFilename();
1912 Dir = DBF.getDirectory();
1913 } else if (Scope.isLexicalBlock()) {
1914 DILexicalBlock DB(S);
1915 Fn = DB.getFilename();
1916 Dir = DB.getDirectory();
1918 llvm_unreachable("Unexpected scope info");
1920 Src = getOrCreateSourceID(Fn, Dir,
1921 Asm->OutStreamer.getContext().getDwarfCompileUnitID());
1923 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0, 0, Fn);
1926 //===----------------------------------------------------------------------===//
1928 //===----------------------------------------------------------------------===//
1930 // Compute the size and offset of a DIE.
1932 DwarfUnits::computeSizeAndOffset(DIE *Die, unsigned Offset) {
1933 // Get the children.
1934 const std::vector<DIE *> &Children = Die->getChildren();
1936 // Record the abbreviation.
1937 assignAbbrevNumber(Die->getAbbrev());
1939 // Get the abbreviation for this DIE.
1940 unsigned AbbrevNumber = Die->getAbbrevNumber();
1941 const DIEAbbrev *Abbrev = Abbreviations->at(AbbrevNumber - 1);
1944 Die->setOffset(Offset);
1946 // Start the size with the size of abbreviation code.
1947 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
1949 const SmallVectorImpl<DIEValue*> &Values = Die->getValues();
1950 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev->getData();
1952 // Size the DIE attribute values.
1953 for (unsigned i = 0, N = Values.size(); i < N; ++i)
1954 // Size attribute value.
1955 Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
1957 // Size the DIE children if any.
1958 if (!Children.empty()) {
1959 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
1960 "Children flag not set");
1962 for (unsigned j = 0, M = Children.size(); j < M; ++j)
1963 Offset = computeSizeAndOffset(Children[j], Offset);
1965 // End of children marker.
1966 Offset += sizeof(int8_t);
1969 Die->setSize(Offset - Die->getOffset());
1973 // Compute the size and offset of all the DIEs.
1974 void DwarfUnits::computeSizeAndOffsets() {
1975 // Offset from the beginning of debug info section.
1976 unsigned SecOffset = 0;
1977 for (SmallVectorImpl<CompileUnit *>::iterator I = CUs.begin(),
1978 E = CUs.end(); I != E; ++I) {
1979 (*I)->setDebugInfoOffset(SecOffset);
1981 sizeof(int32_t) + // Length of Compilation Unit Info
1982 sizeof(int16_t) + // DWARF version number
1983 sizeof(int32_t) + // Offset Into Abbrev. Section
1984 sizeof(int8_t); // Pointer Size (in bytes)
1986 unsigned EndOffset = computeSizeAndOffset((*I)->getCUDie(), Offset);
1987 SecOffset += EndOffset;
1991 // Emit initial Dwarf sections with a label at the start of each one.
1992 void DwarfDebug::emitSectionLabels() {
1993 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1995 // Dwarf sections base addresses.
1996 DwarfInfoSectionSym =
1997 emitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
1998 DwarfAbbrevSectionSym =
1999 emitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
2000 if (useSplitDwarf())
2001 DwarfAbbrevDWOSectionSym =
2002 emitSectionSym(Asm, TLOF.getDwarfAbbrevDWOSection(),
2003 "section_abbrev_dwo");
2004 emitSectionSym(Asm, TLOF.getDwarfARangesSection());
2006 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
2007 emitSectionSym(Asm, MacroInfo);
2009 DwarfLineSectionSym =
2010 emitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
2011 emitSectionSym(Asm, TLOF.getDwarfLocSection());
2012 if (GenerateGnuPubSections) {
2013 DwarfGnuPubNamesSectionSym =
2014 emitSectionSym(Asm, TLOF.getDwarfGnuPubNamesSection());
2015 DwarfGnuPubTypesSectionSym =
2016 emitSectionSym(Asm, TLOF.getDwarfGnuPubTypesSection());
2017 } else if (HasDwarfPubSections) {
2018 emitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
2019 emitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
2022 DwarfStrSectionSym =
2023 emitSectionSym(Asm, TLOF.getDwarfStrSection(), "info_string");
2024 if (useSplitDwarf()) {
2025 DwarfStrDWOSectionSym =
2026 emitSectionSym(Asm, TLOF.getDwarfStrDWOSection(), "skel_string");
2027 DwarfAddrSectionSym =
2028 emitSectionSym(Asm, TLOF.getDwarfAddrSection(), "addr_sec");
2030 DwarfDebugRangeSectionSym = emitSectionSym(Asm, TLOF.getDwarfRangesSection(),
2033 DwarfDebugLocSectionSym = emitSectionSym(Asm, TLOF.getDwarfLocSection(),
2034 "section_debug_loc");
2036 TextSectionSym = emitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
2037 emitSectionSym(Asm, TLOF.getDataSection());
2040 // Recursively emits a debug information entry.
2041 void DwarfDebug::emitDIE(DIE *Die, std::vector<DIEAbbrev *> *Abbrevs) {
2042 // Get the abbreviation for this DIE.
2043 unsigned AbbrevNumber = Die->getAbbrevNumber();
2044 const DIEAbbrev *Abbrev = Abbrevs->at(AbbrevNumber - 1);
2046 // Emit the code (index) for the abbreviation.
2047 if (Asm->isVerbose())
2048 Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
2049 Twine::utohexstr(Die->getOffset()) + ":0x" +
2050 Twine::utohexstr(Die->getSize()) + " " +
2051 dwarf::TagString(Abbrev->getTag()));
2052 Asm->EmitULEB128(AbbrevNumber);
2054 const SmallVectorImpl<DIEValue*> &Values = Die->getValues();
2055 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev->getData();
2057 // Emit the DIE attribute values.
2058 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2059 unsigned Attr = AbbrevData[i].getAttribute();
2060 unsigned Form = AbbrevData[i].getForm();
2061 assert(Form && "Too many attributes for DIE (check abbreviation)");
2063 if (Asm->isVerbose())
2064 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
2067 case dwarf::DW_AT_abstract_origin:
2068 case dwarf::DW_AT_type:
2069 case dwarf::DW_AT_friend:
2070 case dwarf::DW_AT_specification:
2071 case dwarf::DW_AT_containing_type: {
2072 DIEEntry *E = cast<DIEEntry>(Values[i]);
2073 DIE *Origin = E->getEntry();
2074 unsigned Addr = Origin->getOffset();
2075 if (Form == dwarf::DW_FORM_ref_addr) {
2076 // For DW_FORM_ref_addr, output the offset from beginning of debug info
2077 // section. Origin->getOffset() returns the offset from start of the
2079 DwarfUnits &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2080 Addr += Holder.getCUOffset(Origin->getCompileUnit());
2082 Asm->OutStreamer.EmitIntValue(Addr,
2083 Form == dwarf::DW_FORM_ref_addr ? DIEEntry::getRefAddrSize(Asm) : 4);
2086 case dwarf::DW_AT_ranges: {
2087 // DW_AT_range Value encodes offset in debug_range section.
2088 DIEInteger *V = cast<DIEInteger>(Values[i]);
2090 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections()) {
2091 Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym,
2095 Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
2097 DwarfDebugRangeSectionSym,
2102 case dwarf::DW_AT_location: {
2103 if (DIELabel *L = dyn_cast<DIELabel>(Values[i])) {
2104 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2105 Asm->EmitLabelReference(L->getValue(), 4);
2107 Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
2109 Values[i]->EmitValue(Asm, Form);
2113 case dwarf::DW_AT_accessibility: {
2114 if (Asm->isVerbose()) {
2115 DIEInteger *V = cast<DIEInteger>(Values[i]);
2116 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
2118 Values[i]->EmitValue(Asm, Form);
2122 // Emit an attribute using the defined form.
2123 Values[i]->EmitValue(Asm, Form);
2128 // Emit the DIE children if any.
2129 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
2130 const std::vector<DIE *> &Children = Die->getChildren();
2132 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2133 emitDIE(Children[j], Abbrevs);
2135 if (Asm->isVerbose())
2136 Asm->OutStreamer.AddComment("End Of Children Mark");
2141 // Emit the various dwarf units to the unit section USection with
2142 // the abbreviations going into ASection.
2143 void DwarfUnits::emitUnits(DwarfDebug *DD,
2144 const MCSection *USection,
2145 const MCSection *ASection,
2146 const MCSymbol *ASectionSym) {
2147 Asm->OutStreamer.SwitchSection(USection);
2148 for (SmallVectorImpl<CompileUnit *>::iterator I = CUs.begin(),
2149 E = CUs.end(); I != E; ++I) {
2150 CompileUnit *TheCU = *I;
2151 DIE *Die = TheCU->getCUDie();
2153 // Emit the compile units header.
2155 .EmitLabel(Asm->GetTempSymbol(USection->getLabelBeginName(),
2156 TheCU->getUniqueID()));
2158 // Emit size of content not including length itself
2159 unsigned ContentSize = Die->getSize() +
2160 sizeof(int16_t) + // DWARF version number
2161 sizeof(int32_t) + // Offset Into Abbrev. Section
2162 sizeof(int8_t); // Pointer Size (in bytes)
2164 Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
2165 Asm->EmitInt32(ContentSize);
2166 Asm->OutStreamer.AddComment("DWARF version number");
2167 Asm->EmitInt16(DD->getDwarfVersion());
2168 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
2169 Asm->EmitSectionOffset(Asm->GetTempSymbol(ASection->getLabelBeginName()),
2171 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2172 Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
2174 DD->emitDIE(Die, Abbreviations);
2175 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol(USection->getLabelEndName(),
2176 TheCU->getUniqueID()));
2180 /// For a given compile unit DIE, returns offset from beginning of debug info.
2181 unsigned DwarfUnits::getCUOffset(DIE *Die) {
2182 assert(Die->getTag() == dwarf::DW_TAG_compile_unit &&
2183 "Input DIE should be compile unit in getCUOffset.");
2184 for (SmallVectorImpl<CompileUnit *>::iterator I = CUs.begin(), E = CUs.end();
2186 CompileUnit *TheCU = *I;
2187 if (TheCU->getCUDie() == Die)
2188 return TheCU->getDebugInfoOffset();
2190 llvm_unreachable("The compile unit DIE should belong to CUs in DwarfUnits.");
2193 // Emit the debug info section.
2194 void DwarfDebug::emitDebugInfo() {
2195 DwarfUnits &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2197 Holder.emitUnits(this, Asm->getObjFileLowering().getDwarfInfoSection(),
2198 Asm->getObjFileLowering().getDwarfAbbrevSection(),
2199 DwarfAbbrevSectionSym);
2202 // Emit the abbreviation section.
2203 void DwarfDebug::emitAbbreviations() {
2204 if (!useSplitDwarf())
2205 emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection(),
2208 emitSkeletonAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection());
2211 void DwarfDebug::emitAbbrevs(const MCSection *Section,
2212 std::vector<DIEAbbrev *> *Abbrevs) {
2213 // Check to see if it is worth the effort.
2214 if (!Abbrevs->empty()) {
2215 // Start the debug abbrev section.
2216 Asm->OutStreamer.SwitchSection(Section);
2218 MCSymbol *Begin = Asm->GetTempSymbol(Section->getLabelBeginName());
2219 Asm->OutStreamer.EmitLabel(Begin);
2221 // For each abbrevation.
2222 for (unsigned i = 0, N = Abbrevs->size(); i < N; ++i) {
2223 // Get abbreviation data
2224 const DIEAbbrev *Abbrev = Abbrevs->at(i);
2226 // Emit the abbrevations code (base 1 index.)
2227 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
2229 // Emit the abbreviations data.
2233 // Mark end of abbreviations.
2234 Asm->EmitULEB128(0, "EOM(3)");
2236 MCSymbol *End = Asm->GetTempSymbol(Section->getLabelEndName());
2237 Asm->OutStreamer.EmitLabel(End);
2241 // Emit the last address of the section and the end of the line matrix.
2242 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
2243 // Define last address of section.
2244 Asm->OutStreamer.AddComment("Extended Op");
2247 Asm->OutStreamer.AddComment("Op size");
2248 Asm->EmitInt8(Asm->getDataLayout().getPointerSize() + 1);
2249 Asm->OutStreamer.AddComment("DW_LNE_set_address");
2250 Asm->EmitInt8(dwarf::DW_LNE_set_address);
2252 Asm->OutStreamer.AddComment("Section end label");
2254 Asm->OutStreamer.EmitSymbolValue(Asm->GetTempSymbol("section_end",SectionEnd),
2255 Asm->getDataLayout().getPointerSize());
2257 // Mark end of matrix.
2258 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
2264 // Emit visible names into a hashed accelerator table section.
2265 void DwarfDebug::emitAccelNames() {
2266 DwarfAccelTable AT(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2267 dwarf::DW_FORM_data4));
2268 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2269 E = CUMap.end(); I != E; ++I) {
2270 CompileUnit *TheCU = I->second;
2271 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelNames();
2272 for (StringMap<std::vector<DIE*> >::const_iterator
2273 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2274 StringRef Name = GI->getKey();
2275 const std::vector<DIE *> &Entities = GI->second;
2276 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
2277 DE = Entities.end(); DI != DE; ++DI)
2278 AT.AddName(Name, (*DI));
2282 AT.FinalizeTable(Asm, "Names");
2283 Asm->OutStreamer.SwitchSection(
2284 Asm->getObjFileLowering().getDwarfAccelNamesSection());
2285 MCSymbol *SectionBegin = Asm->GetTempSymbol("names_begin");
2286 Asm->OutStreamer.EmitLabel(SectionBegin);
2288 // Emit the full data.
2289 AT.Emit(Asm, SectionBegin, &InfoHolder);
2292 // Emit objective C classes and categories into a hashed accelerator table
2294 void DwarfDebug::emitAccelObjC() {
2295 DwarfAccelTable AT(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2296 dwarf::DW_FORM_data4));
2297 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2298 E = CUMap.end(); I != E; ++I) {
2299 CompileUnit *TheCU = I->second;
2300 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelObjC();
2301 for (StringMap<std::vector<DIE*> >::const_iterator
2302 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2303 StringRef Name = GI->getKey();
2304 const std::vector<DIE *> &Entities = GI->second;
2305 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
2306 DE = Entities.end(); DI != DE; ++DI)
2307 AT.AddName(Name, (*DI));
2311 AT.FinalizeTable(Asm, "ObjC");
2312 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
2313 .getDwarfAccelObjCSection());
2314 MCSymbol *SectionBegin = Asm->GetTempSymbol("objc_begin");
2315 Asm->OutStreamer.EmitLabel(SectionBegin);
2317 // Emit the full data.
2318 AT.Emit(Asm, SectionBegin, &InfoHolder);
2321 // Emit namespace dies into a hashed accelerator table.
2322 void DwarfDebug::emitAccelNamespaces() {
2323 DwarfAccelTable AT(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2324 dwarf::DW_FORM_data4));
2325 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2326 E = CUMap.end(); I != E; ++I) {
2327 CompileUnit *TheCU = I->second;
2328 const StringMap<std::vector<DIE*> > &Names = TheCU->getAccelNamespace();
2329 for (StringMap<std::vector<DIE*> >::const_iterator
2330 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2331 StringRef Name = GI->getKey();
2332 const std::vector<DIE *> &Entities = GI->second;
2333 for (std::vector<DIE *>::const_iterator DI = Entities.begin(),
2334 DE = Entities.end(); DI != DE; ++DI)
2335 AT.AddName(Name, (*DI));
2339 AT.FinalizeTable(Asm, "namespac");
2340 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
2341 .getDwarfAccelNamespaceSection());
2342 MCSymbol *SectionBegin = Asm->GetTempSymbol("namespac_begin");
2343 Asm->OutStreamer.EmitLabel(SectionBegin);
2345 // Emit the full data.
2346 AT.Emit(Asm, SectionBegin, &InfoHolder);
2349 // Emit type dies into a hashed accelerator table.
2350 void DwarfDebug::emitAccelTypes() {
2351 std::vector<DwarfAccelTable::Atom> Atoms;
2352 Atoms.push_back(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
2353 dwarf::DW_FORM_data4));
2354 Atoms.push_back(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_tag,
2355 dwarf::DW_FORM_data2));
2356 Atoms.push_back(DwarfAccelTable::Atom(dwarf::DW_ATOM_type_flags,
2357 dwarf::DW_FORM_data1));
2358 DwarfAccelTable AT(Atoms);
2359 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2360 E = CUMap.end(); I != E; ++I) {
2361 CompileUnit *TheCU = I->second;
2362 const StringMap<std::vector<std::pair<DIE*, unsigned > > > &Names
2363 = TheCU->getAccelTypes();
2364 for (StringMap<std::vector<std::pair<DIE*, unsigned> > >::const_iterator
2365 GI = Names.begin(), GE = Names.end(); GI != GE; ++GI) {
2366 StringRef Name = GI->getKey();
2367 const std::vector<std::pair<DIE *, unsigned> > &Entities = GI->second;
2368 for (std::vector<std::pair<DIE *, unsigned> >::const_iterator DI
2369 = Entities.begin(), DE = Entities.end(); DI !=DE; ++DI)
2370 AT.AddName(Name, (*DI).first, (*DI).second);
2374 AT.FinalizeTable(Asm, "types");
2375 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering()
2376 .getDwarfAccelTypesSection());
2377 MCSymbol *SectionBegin = Asm->GetTempSymbol("types_begin");
2378 Asm->OutStreamer.EmitLabel(SectionBegin);
2380 // Emit the full data.
2381 AT.Emit(Asm, SectionBegin, &InfoHolder);
2384 // Public name handling.
2385 // The format for the various pubnames:
2387 // dwarf pubnames - offset/name pairs where the offset is the offset into the CU
2388 // for the DIE that is named.
2390 // gnu pubnames - offset/index value/name tuples where the offset is the offset
2391 // into the CU and the index value is computed according to the type of value
2392 // for the DIE that is named.
2394 // For type units the offset is the offset of the skeleton DIE. For split dwarf
2395 // it's the offset within the debug_info/debug_types dwo section, however, the
2396 // reference in the pubname header doesn't change.
2398 /// computeIndexValue - Compute the gdb index value for the DIE and CU.
2399 static dwarf::PubIndexEntryDescriptor computeIndexValue(CompileUnit *CU,
2401 dwarf::GDBIndexEntryLinkage Linkage =
2402 Die->findAttribute(dwarf::DW_AT_external) ? dwarf::GIEL_EXTERNAL
2403 : dwarf::GIEL_STATIC;
2405 switch (Die->getTag()) {
2406 case dwarf::DW_TAG_class_type:
2407 case dwarf::DW_TAG_structure_type:
2408 case dwarf::DW_TAG_union_type:
2409 case dwarf::DW_TAG_enumeration_type:
2410 return dwarf::PubIndexEntryDescriptor(
2411 dwarf::GIEK_TYPE, CU->getLanguage() != dwarf::DW_LANG_C_plus_plus
2412 ? dwarf::GIEL_STATIC
2413 : dwarf::GIEL_EXTERNAL);
2414 case dwarf::DW_TAG_typedef:
2415 case dwarf::DW_TAG_base_type:
2416 case dwarf::DW_TAG_subrange_type:
2417 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_TYPE, dwarf::GIEL_STATIC);
2418 case dwarf::DW_TAG_namespace:
2419 return dwarf::GIEK_TYPE;
2420 case dwarf::DW_TAG_subprogram:
2421 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_FUNCTION, Linkage);
2422 case dwarf::DW_TAG_constant:
2423 case dwarf::DW_TAG_variable:
2424 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE, Linkage);
2425 case dwarf::DW_TAG_enumerator:
2426 return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE,
2427 dwarf::GIEL_STATIC);
2429 return dwarf::GIEK_NONE;
2433 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
2435 void DwarfDebug::emitDebugPubNames(bool GnuStyle) {
2436 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2437 const MCSection *PSec =
2438 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubNamesSection()
2439 : Asm->getObjFileLowering().getDwarfPubNamesSection();
2441 typedef DenseMap<const MDNode*, CompileUnit*> CUMapType;
2442 for (CUMapType::iterator I = CUMap.begin(), E = CUMap.end(); I != E; ++I) {
2443 CompileUnit *TheCU = I->second;
2444 unsigned ID = TheCU->getUniqueID();
2446 // Start the dwarf pubnames section.
2447 Asm->OutStreamer.SwitchSection(PSec);
2449 // Emit a label so we can reference the beginning of this pubname section.
2451 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("gnu_pubnames",
2452 TheCU->getUniqueID()));
2455 Asm->OutStreamer.AddComment("Length of Public Names Info");
2456 Asm->EmitLabelDifference(Asm->GetTempSymbol("pubnames_end", ID),
2457 Asm->GetTempSymbol("pubnames_begin", ID), 4);
2459 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin", ID));
2461 Asm->OutStreamer.AddComment("DWARF Version");
2462 Asm->EmitInt16(dwarf::DW_PUBNAMES_VERSION);
2464 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2465 Asm->EmitSectionOffset(Asm->GetTempSymbol(ISec->getLabelBeginName(), ID),
2466 DwarfInfoSectionSym);
2468 Asm->OutStreamer.AddComment("Compilation Unit Length");
2469 Asm->EmitLabelDifference(Asm->GetTempSymbol(ISec->getLabelEndName(), ID),
2470 Asm->GetTempSymbol(ISec->getLabelBeginName(), ID),
2473 // Emit the pubnames for this compilation unit.
2474 const StringMap<DIE*> &Globals = TheCU->getGlobalNames();
2475 for (StringMap<DIE*>::const_iterator
2476 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2477 const char *Name = GI->getKeyData();
2478 DIE *Entity = GI->second;
2480 Asm->OutStreamer.AddComment("DIE offset");
2481 Asm->EmitInt32(Entity->getOffset());
2484 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheCU, Entity);
2485 Asm->OutStreamer.AddComment(
2486 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
2487 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
2488 Asm->EmitInt8(Desc.toBits());
2491 if (Asm->isVerbose())
2492 Asm->OutStreamer.AddComment("External Name");
2493 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1));
2496 Asm->OutStreamer.AddComment("End Mark");
2498 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_end", ID));
2502 void DwarfDebug::emitDebugPubTypes(bool GnuStyle) {
2503 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2504 const MCSection *PSec =
2505 GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubTypesSection()
2506 : Asm->getObjFileLowering().getDwarfPubTypesSection();
2508 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2511 CompileUnit *TheCU = I->second;
2512 // Start the dwarf pubtypes section.
2513 Asm->OutStreamer.SwitchSection(PSec);
2515 // Emit a label so we can reference the beginning of this pubtype section.
2517 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("gnu_pubtypes",
2518 TheCU->getUniqueID()));
2521 Asm->OutStreamer.AddComment("Length of Public Types Info");
2522 Asm->EmitLabelDifference(
2523 Asm->GetTempSymbol("pubtypes_end", TheCU->getUniqueID()),
2524 Asm->GetTempSymbol("pubtypes_begin", TheCU->getUniqueID()), 4);
2526 Asm->OutStreamer.EmitLabel(
2527 Asm->GetTempSymbol("pubtypes_begin", TheCU->getUniqueID()));
2529 if (Asm->isVerbose())
2530 Asm->OutStreamer.AddComment("DWARF Version");
2531 Asm->EmitInt16(dwarf::DW_PUBTYPES_VERSION);
2533 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2534 Asm->EmitSectionOffset(
2535 Asm->GetTempSymbol(ISec->getLabelBeginName(), TheCU->getUniqueID()),
2536 DwarfInfoSectionSym);
2538 Asm->OutStreamer.AddComment("Compilation Unit Length");
2539 Asm->EmitLabelDifference(
2540 Asm->GetTempSymbol(ISec->getLabelEndName(), TheCU->getUniqueID()),
2541 Asm->GetTempSymbol(ISec->getLabelBeginName(), TheCU->getUniqueID()), 4);
2543 // Emit the pubtypes.
2544 const StringMap<DIE *> &Globals = TheCU->getGlobalTypes();
2545 for (StringMap<DIE *>::const_iterator GI = Globals.begin(),
2548 const char *Name = GI->getKeyData();
2549 DIE *Entity = GI->second;
2551 if (Asm->isVerbose())
2552 Asm->OutStreamer.AddComment("DIE offset");
2553 Asm->EmitInt32(Entity->getOffset());
2556 dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheCU, Entity);
2557 Asm->OutStreamer.AddComment(
2558 Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
2559 dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
2560 Asm->EmitInt8(Desc.toBits());
2563 if (Asm->isVerbose())
2564 Asm->OutStreamer.AddComment("External Name");
2566 // Emit the name with a terminating null byte.
2567 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength() + 1));
2570 Asm->OutStreamer.AddComment("End Mark");
2572 Asm->OutStreamer.EmitLabel(
2573 Asm->GetTempSymbol("pubtypes_end", TheCU->getUniqueID()));
2577 // Emit strings into a string section.
2578 void DwarfUnits::emitStrings(const MCSection *StrSection,
2579 const MCSection *OffsetSection = NULL,
2580 const MCSymbol *StrSecSym = NULL) {
2582 if (StringPool.empty()) return;
2584 // Start the dwarf str section.
2585 Asm->OutStreamer.SwitchSection(StrSection);
2587 // Get all of the string pool entries and put them in an array by their ID so
2588 // we can sort them.
2589 SmallVector<std::pair<unsigned,
2590 StringMapEntry<std::pair<MCSymbol*, unsigned> >*>, 64> Entries;
2592 for (StringMap<std::pair<MCSymbol*, unsigned> >::iterator
2593 I = StringPool.begin(), E = StringPool.end();
2595 Entries.push_back(std::make_pair(I->second.second, &*I));
2597 array_pod_sort(Entries.begin(), Entries.end());
2599 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2600 // Emit a label for reference from debug information entries.
2601 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
2603 // Emit the string itself with a terminating null byte.
2604 Asm->OutStreamer.EmitBytes(StringRef(Entries[i].second->getKeyData(),
2605 Entries[i].second->getKeyLength()+1));
2608 // If we've got an offset section go ahead and emit that now as well.
2609 if (OffsetSection) {
2610 Asm->OutStreamer.SwitchSection(OffsetSection);
2611 unsigned offset = 0;
2612 unsigned size = 4; // FIXME: DWARF64 is 8.
2613 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2614 Asm->OutStreamer.EmitIntValue(offset, size);
2615 offset += Entries[i].second->getKeyLength() + 1;
2620 // Emit strings into a string section.
2621 void DwarfUnits::emitAddresses(const MCSection *AddrSection) {
2623 if (AddressPool.empty()) return;
2625 // Start the dwarf addr section.
2626 Asm->OutStreamer.SwitchSection(AddrSection);
2628 // Order the address pool entries by ID
2629 SmallVector<const MCExpr *, 64> Entries(AddressPool.size());
2631 for (DenseMap<const MCExpr *, unsigned>::iterator I = AddressPool.begin(),
2632 E = AddressPool.end();
2634 Entries[I->second] = I->first;
2636 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2637 // Emit an expression for reference from debug information entries.
2638 if (const MCExpr *Expr = Entries[i])
2639 Asm->OutStreamer.EmitValue(Expr, Asm->getDataLayout().getPointerSize());
2641 Asm->OutStreamer.EmitIntValue(0, Asm->getDataLayout().getPointerSize());
2646 // Emit visible names into a debug str section.
2647 void DwarfDebug::emitDebugStr() {
2648 DwarfUnits &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
2649 Holder.emitStrings(Asm->getObjFileLowering().getDwarfStrSection());
2652 // Emit locations into the debug loc section.
2653 void DwarfDebug::emitDebugLoc() {
2654 if (DotDebugLocEntries.empty())
2657 for (SmallVectorImpl<DotDebugLocEntry>::iterator
2658 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2660 DotDebugLocEntry &Entry = *I;
2661 if (I + 1 != DotDebugLocEntries.end())
2665 // Start the dwarf loc section.
2666 Asm->OutStreamer.SwitchSection(
2667 Asm->getObjFileLowering().getDwarfLocSection());
2668 unsigned char Size = Asm->getDataLayout().getPointerSize();
2669 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
2671 for (SmallVectorImpl<DotDebugLocEntry>::iterator
2672 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2673 I != E; ++I, ++index) {
2674 DotDebugLocEntry &Entry = *I;
2675 if (Entry.isMerged()) continue;
2676 if (Entry.isEmpty()) {
2677 Asm->OutStreamer.EmitIntValue(0, Size);
2678 Asm->OutStreamer.EmitIntValue(0, Size);
2679 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
2681 Asm->OutStreamer.EmitSymbolValue(Entry.getBeginSym(), Size);
2682 Asm->OutStreamer.EmitSymbolValue(Entry.getEndSym(), Size);
2683 DIVariable DV(Entry.getVariable());
2684 Asm->OutStreamer.AddComment("Loc expr size");
2685 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
2686 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
2687 Asm->EmitLabelDifference(end, begin, 2);
2688 Asm->OutStreamer.EmitLabel(begin);
2689 if (Entry.isInt()) {
2690 DIBasicType BTy(DV.getType());
2692 (BTy.getEncoding() == dwarf::DW_ATE_signed
2693 || BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
2694 Asm->OutStreamer.AddComment("DW_OP_consts");
2695 Asm->EmitInt8(dwarf::DW_OP_consts);
2696 Asm->EmitSLEB128(Entry.getInt());
2698 Asm->OutStreamer.AddComment("DW_OP_constu");
2699 Asm->EmitInt8(dwarf::DW_OP_constu);
2700 Asm->EmitULEB128(Entry.getInt());
2702 } else if (Entry.isLocation()) {
2703 MachineLocation Loc = Entry.getLoc();
2704 if (!DV.hasComplexAddress())
2706 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2708 // Complex address entry.
2709 unsigned N = DV.getNumAddrElements();
2711 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
2712 if (Loc.getOffset()) {
2714 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2715 Asm->OutStreamer.AddComment("DW_OP_deref");
2716 Asm->EmitInt8(dwarf::DW_OP_deref);
2717 Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
2718 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2719 Asm->EmitSLEB128(DV.getAddrElement(1));
2721 // If first address element is OpPlus then emit
2722 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
2723 MachineLocation TLoc(Loc.getReg(), DV.getAddrElement(1));
2724 Asm->EmitDwarfRegOp(TLoc, DV.isIndirect());
2728 Asm->EmitDwarfRegOp(Loc, DV.isIndirect());
2731 // Emit remaining complex address elements.
2732 for (; i < N; ++i) {
2733 uint64_t Element = DV.getAddrElement(i);
2734 if (Element == DIBuilder::OpPlus) {
2735 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2736 Asm->EmitULEB128(DV.getAddrElement(++i));
2737 } else if (Element == DIBuilder::OpDeref) {
2739 Asm->EmitInt8(dwarf::DW_OP_deref);
2741 llvm_unreachable("unknown Opcode found in complex address");
2745 // else ... ignore constant fp. There is not any good way to
2746 // to represent them here in dwarf.
2747 Asm->OutStreamer.EmitLabel(end);
2752 struct SymbolCUSorter {
2753 SymbolCUSorter(const MCStreamer &s) : Streamer(s) {}
2754 const MCStreamer &Streamer;
2756 bool operator() (const SymbolCU &A, const SymbolCU &B) {
2757 unsigned IA = A.Sym ? Streamer.GetSymbolOrder(A.Sym) : 0;
2758 unsigned IB = B.Sym ? Streamer.GetSymbolOrder(B.Sym) : 0;
2760 // Symbols with no order assigned should be placed at the end.
2761 // (e.g. section end labels)
2763 IA = (unsigned)(-1);
2765 IB = (unsigned)(-1);
2770 static bool CUSort(const CompileUnit *A, const CompileUnit *B) {
2771 return (A->getUniqueID() < B->getUniqueID());
2775 const MCSymbol *Start, *End;
2778 // Emit a debug aranges section, containing a CU lookup for any
2779 // address we can tie back to a CU.
2780 void DwarfDebug::emitDebugARanges() {
2781 // Start the dwarf aranges section.
2783 .SwitchSection(Asm->getObjFileLowering().getDwarfARangesSection());
2785 typedef DenseMap<CompileUnit *, std::vector<ArangeSpan> > SpansType;
2789 // Build a list of sections used.
2790 std::vector<const MCSection *> Sections;
2791 for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
2793 const MCSection *Section = it->first;
2794 Sections.push_back(Section);
2797 // Sort the sections into order.
2798 // This is only done to ensure consistent output order across different runs.
2799 std::sort(Sections.begin(), Sections.end(), SectionSort);
2801 // Build a set of address spans, sorted by CU.
2802 for (size_t SecIdx=0;SecIdx<Sections.size();SecIdx++) {
2803 const MCSection *Section = Sections[SecIdx];
2804 SmallVector<SymbolCU, 8> &List = SectionMap[Section];
2805 if (List.size() < 2)
2808 // Sort the symbols by offset within the section.
2809 SymbolCUSorter sorter(Asm->OutStreamer);
2810 std::sort(List.begin(), List.end(), sorter);
2812 // If we have no section (e.g. common), just write out
2813 // individual spans for each symbol.
2814 if (Section == NULL) {
2815 for (size_t n = 0; n < List.size(); n++) {
2816 const SymbolCU &Cur = List[n];
2819 Span.Start = Cur.Sym;
2822 Spans[Cur.CU].push_back(Span);
2825 // Build spans between each label.
2826 const MCSymbol *StartSym = List[0].Sym;
2827 for (size_t n = 1; n < List.size(); n++) {
2828 const SymbolCU &Prev = List[n - 1];
2829 const SymbolCU &Cur = List[n];
2831 // Try and build the longest span we can within the same CU.
2832 if (Cur.CU != Prev.CU) {
2834 Span.Start = StartSym;
2836 Spans[Prev.CU].push_back(Span);
2843 const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
2844 unsigned PtrSize = Asm->getDataLayout().getPointerSize();
2846 // Build a list of CUs used.
2847 std::vector<CompileUnit *> CUs;
2848 for (SpansType::iterator it = Spans.begin(); it != Spans.end(); it++) {
2849 CompileUnit *CU = it->first;
2853 // Sort the CU list (again, to ensure consistent output order).
2854 std::sort(CUs.begin(), CUs.end(), CUSort);
2856 // Emit an arange table for each CU we used.
2857 for (size_t CUIdx=0;CUIdx<CUs.size();CUIdx++) {
2858 CompileUnit *CU = CUs[CUIdx];
2859 std::vector<ArangeSpan> &List = Spans[CU];
2861 // Emit size of content not including length itself.
2862 unsigned ContentSize
2863 = sizeof(int16_t) // DWARF ARange version number
2864 + sizeof(int32_t) // Offset of CU in the .debug_info section
2865 + sizeof(int8_t) // Pointer Size (in bytes)
2866 + sizeof(int8_t); // Segment Size (in bytes)
2868 unsigned TupleSize = PtrSize * 2;
2870 // 7.20 in the Dwarf specs requires the table to be aligned to a tuple.
2871 unsigned Padding = 0;
2872 while (((sizeof(int32_t) + ContentSize + Padding) % TupleSize) != 0)
2875 ContentSize += Padding;
2876 ContentSize += (List.size() + 1) * TupleSize;
2878 // For each compile unit, write the list of spans it covers.
2879 Asm->OutStreamer.AddComment("Length of ARange Set");
2880 Asm->EmitInt32(ContentSize);
2881 Asm->OutStreamer.AddComment("DWARF Arange version number");
2882 Asm->EmitInt16(dwarf::DW_ARANGES_VERSION);
2883 Asm->OutStreamer.AddComment("Offset Into Debug Info Section");
2884 Asm->EmitSectionOffset(
2885 Asm->GetTempSymbol(ISec->getLabelBeginName(), CU->getUniqueID()),
2886 DwarfInfoSectionSym);
2887 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2888 Asm->EmitInt8(PtrSize);
2889 Asm->OutStreamer.AddComment("Segment Size (in bytes)");
2892 for (unsigned n = 0; n < Padding; n++)
2893 Asm->EmitInt8(0xff);
2895 for (unsigned n = 0; n < List.size(); n++) {
2896 const ArangeSpan &Span = List[n];
2897 Asm->EmitLabelReference(Span.Start, PtrSize);
2899 // Calculate the size as being from the span start to it's end.
2901 Asm->EmitLabelDifference(Span.End, Span.Start, PtrSize);
2903 // For symbols without an end marker (e.g. common), we
2904 // write a single arange entry containing just that one symbol.
2905 uint64_t Size = SymSize[Span.Start];
2909 Asm->OutStreamer.EmitIntValue(Size, PtrSize);
2913 Asm->OutStreamer.AddComment("ARange terminator");
2914 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2915 Asm->OutStreamer.EmitIntValue(0, PtrSize);
2919 // Emit visible names into a debug ranges section.
2920 void DwarfDebug::emitDebugRanges() {
2921 // Start the dwarf ranges section.
2923 .SwitchSection(Asm->getObjFileLowering().getDwarfRangesSection());
2924 unsigned char Size = Asm->getDataLayout().getPointerSize();
2925 for (SmallVectorImpl<const MCSymbol *>::iterator
2926 I = DebugRangeSymbols.begin(), E = DebugRangeSymbols.end();
2929 Asm->OutStreamer.EmitSymbolValue(const_cast<MCSymbol*>(*I), Size);
2931 Asm->OutStreamer.EmitIntValue(0, Size);
2935 // Emit visible names into a debug macinfo section.
2936 void DwarfDebug::emitDebugMacInfo() {
2937 if (const MCSection *LineInfo =
2938 Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
2939 // Start the dwarf macinfo section.
2940 Asm->OutStreamer.SwitchSection(LineInfo);
2944 // DWARF5 Experimental Separate Dwarf emitters.
2946 // This DIE has the following attributes: DW_AT_comp_dir, DW_AT_stmt_list,
2947 // DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges, DW_AT_dwo_name, DW_AT_dwo_id,
2948 // DW_AT_ranges_base, DW_AT_addr_base.
2949 CompileUnit *DwarfDebug::constructSkeletonCU(const CompileUnit *CU) {
2951 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
2952 CompileUnit *NewCU = new CompileUnit(CU->getUniqueID(), Die, CU->getNode(),
2953 Asm, this, &SkeletonHolder);
2955 NewCU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name,
2956 DICompileUnit(CU->getNode()).getSplitDebugFilename());
2958 // Relocate to the beginning of the addr_base section, else 0 for the
2959 // beginning of the one for this compile unit.
2960 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2961 NewCU->addLabel(Die, dwarf::DW_AT_GNU_addr_base, dwarf::DW_FORM_sec_offset,
2962 DwarfAddrSectionSym);
2964 NewCU->addUInt(Die, dwarf::DW_AT_GNU_addr_base,
2965 dwarf::DW_FORM_sec_offset, 0);
2967 // 2.17.1 requires that we use DW_AT_low_pc for a single entry point
2968 // into an entity. We're using 0, or a NULL label for this.
2969 NewCU->addUInt(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, 0);
2971 // DW_AT_stmt_list is a offset of line number information for this
2972 // compile unit in debug_line section.
2973 // FIXME: Should handle multiple compile units.
2974 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2975 NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_sec_offset,
2976 DwarfLineSectionSym);
2978 NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_sec_offset, 0);
2980 if (!CompilationDir.empty())
2981 NewCU->addLocalString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
2983 // Flags to let the linker know we have emitted new style pubnames.
2984 if (GenerateGnuPubSections) {
2985 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2986 NewCU->addLabel(Die, dwarf::DW_AT_GNU_pubnames, dwarf::DW_FORM_sec_offset,
2987 Asm->GetTempSymbol("gnu_pubnames", NewCU->getUniqueID()));
2989 NewCU->addDelta(Die, dwarf::DW_AT_GNU_pubnames, dwarf::DW_FORM_data4,
2990 Asm->GetTempSymbol("gnu_pubnames", NewCU->getUniqueID()),
2991 DwarfGnuPubNamesSectionSym);
2993 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
2994 NewCU->addLabel(Die, dwarf::DW_AT_GNU_pubtypes, dwarf::DW_FORM_sec_offset,
2995 Asm->GetTempSymbol("gnu_pubtypes", NewCU->getUniqueID()));
2997 NewCU->addDelta(Die, dwarf::DW_AT_GNU_pubtypes, dwarf::DW_FORM_data4,
2998 Asm->GetTempSymbol("gnu_pubtypes", NewCU->getUniqueID()),
2999 DwarfGnuPubTypesSectionSym);
3002 // Flag if we've emitted any ranges and their location for the compile unit.
3003 if (DebugRangeSymbols.size()) {
3004 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
3005 NewCU->addLabel(Die, dwarf::DW_AT_GNU_ranges_base,
3006 dwarf::DW_FORM_sec_offset, DwarfDebugRangeSectionSym);
3008 NewCU->addUInt(Die, dwarf::DW_AT_GNU_ranges_base, dwarf::DW_FORM_data4,
3012 SkeletonHolder.addUnit(NewCU);
3013 SkeletonCUs.push_back(NewCU);
3018 void DwarfDebug::emitSkeletonAbbrevs(const MCSection *Section) {
3019 assert(useSplitDwarf() && "No split dwarf debug info?");
3020 emitAbbrevs(Section, &SkeletonAbbrevs);
3023 // Emit the .debug_info.dwo section for separated dwarf. This contains the
3024 // compile units that would normally be in debug_info.
3025 void DwarfDebug::emitDebugInfoDWO() {
3026 assert(useSplitDwarf() && "No split dwarf debug info?");
3027 InfoHolder.emitUnits(this, Asm->getObjFileLowering().getDwarfInfoDWOSection(),
3028 Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
3029 DwarfAbbrevDWOSectionSym);
3032 // Emit the .debug_abbrev.dwo section for separated dwarf. This contains the
3033 // abbreviations for the .debug_info.dwo section.
3034 void DwarfDebug::emitDebugAbbrevDWO() {
3035 assert(useSplitDwarf() && "No split dwarf?");
3036 emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
3040 // Emit the .debug_str.dwo section for separated dwarf. This contains the
3041 // string section and is identical in format to traditional .debug_str
3043 void DwarfDebug::emitDebugStrDWO() {
3044 assert(useSplitDwarf() && "No split dwarf?");
3045 const MCSection *OffSec = Asm->getObjFileLowering()
3046 .getDwarfStrOffDWOSection();
3047 const MCSymbol *StrSym = DwarfStrSectionSym;
3048 InfoHolder.emitStrings(Asm->getObjFileLowering().getDwarfStrDWOSection(),
3052 /// When we don't know whether the correct form is ref4 or ref_addr, we create
3053 /// a worklist item and insert it to DIEEntryWorklist.
3054 void DwarfDebug::addDIEEntry(DIE *Die, uint16_t Attribute, uint16_t Form,
3056 /// Early exit when we only have a single CU.
3057 if (GlobalCUIndexCount == 1 || Form != dwarf::DW_FORM_ref4) {
3058 Die->addValue(Attribute, Form, Entry);
3061 DIE *DieCU = Die->checkCompileUnit();
3062 DIE *EntryCU = Entry->getEntry()->checkCompileUnit();
3063 if (!DieCU || !EntryCU) {
3064 // Die or Entry is not added to an owner yet.
3065 insertDIEEntryWorklist(Die, Attribute, Entry);
3068 Die->addValue(Attribute,
3069 EntryCU == DieCU ? dwarf::DW_FORM_ref4 : dwarf::DW_FORM_ref_addr,