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"
17 #include "DwarfCompileUnit.h"
18 #include "llvm/Constants.h"
19 #include "llvm/Module.h"
20 #include "llvm/Instructions.h"
21 #include "llvm/CodeGen/MachineFunction.h"
22 #include "llvm/CodeGen/MachineModuleInfo.h"
23 #include "llvm/MC/MCAsmInfo.h"
24 #include "llvm/MC/MCSection.h"
25 #include "llvm/MC/MCStreamer.h"
26 #include "llvm/MC/MCSymbol.h"
27 #include "llvm/Target/Mangler.h"
28 #include "llvm/Target/TargetData.h"
29 #include "llvm/Target/TargetFrameLowering.h"
30 #include "llvm/Target/TargetLoweringObjectFile.h"
31 #include "llvm/Target/TargetMachine.h"
32 #include "llvm/Target/TargetRegisterInfo.h"
33 #include "llvm/Target/TargetOptions.h"
34 #include "llvm/Analysis/DebugInfo.h"
35 #include "llvm/Analysis/DIBuilder.h"
36 #include "llvm/ADT/Statistic.h"
37 #include "llvm/ADT/STLExtras.h"
38 #include "llvm/ADT/StringExtras.h"
39 #include "llvm/Support/CommandLine.h"
40 #include "llvm/Support/Debug.h"
41 #include "llvm/Support/ErrorHandling.h"
42 #include "llvm/Support/ValueHandle.h"
43 #include "llvm/Support/FormattedStream.h"
44 #include "llvm/Support/Timer.h"
45 #include "llvm/Support/Path.h"
48 static cl::opt<bool> PrintDbgScope("print-dbgscope", cl::Hidden,
49 cl::desc("Print DbgScope information for each machine instruction"));
51 static cl::opt<bool> DisableDebugInfoPrinting("disable-debug-info-print",
53 cl::desc("Disable debug info printing"));
55 static cl::opt<bool> UnknownLocations("use-unknown-locations", cl::Hidden,
56 cl::desc("Make an absence of debug location information explicit."),
60 const char *DWARFGroupName = "DWARF Emission";
61 const char *DbgTimerName = "DWARF Debug Writer";
62 } // end anonymous namespace
64 //===----------------------------------------------------------------------===//
66 /// Configuration values for initial hash set sizes (log2).
68 static const unsigned InitAbbreviationsSetSize = 9; // log2(512)
72 DIType DbgVariable::getType() const {
73 DIType Ty = Var.getType();
74 // FIXME: isBlockByrefVariable should be reformulated in terms of complex
76 if (Var.isBlockByrefVariable()) {
77 /* Byref variables, in Blocks, are declared by the programmer as
78 "SomeType VarName;", but the compiler creates a
79 __Block_byref_x_VarName struct, and gives the variable VarName
80 either the struct, or a pointer to the struct, as its type. This
81 is necessary for various behind-the-scenes things the compiler
82 needs to do with by-reference variables in blocks.
84 However, as far as the original *programmer* is concerned, the
85 variable should still have type 'SomeType', as originally declared.
87 The following function dives into the __Block_byref_x_VarName
88 struct to find the original type of the variable. This will be
89 passed back to the code generating the type for the Debug
90 Information Entry for the variable 'VarName'. 'VarName' will then
91 have the original type 'SomeType' in its debug information.
93 The original type 'SomeType' will be the type of the field named
94 'VarName' inside the __Block_byref_x_VarName struct.
96 NOTE: In order for this to not completely fail on the debugger
97 side, the Debug Information Entry for the variable VarName needs to
98 have a DW_AT_location that tells the debugger how to unwind through
99 the pointers and __Block_byref_x_VarName struct to find the actual
100 value of the variable. The function addBlockByrefType does this. */
102 unsigned tag = Ty.getTag();
104 if (tag == dwarf::DW_TAG_pointer_type) {
105 DIDerivedType DTy = DIDerivedType(Ty);
106 subType = DTy.getTypeDerivedFrom();
109 DICompositeType blockStruct = DICompositeType(subType);
110 DIArray Elements = blockStruct.getTypeArray();
112 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
113 DIDescriptor Element = Elements.getElement(i);
114 DIDerivedType DT = DIDerivedType(Element);
115 if (getName() == DT.getName())
116 return (DT.getTypeDerivedFrom());
123 //===----------------------------------------------------------------------===//
124 /// DbgRange - This is used to track range of instructions with identical
125 /// debug info scope.
127 typedef std::pair<const MachineInstr *, const MachineInstr *> DbgRange;
129 //===----------------------------------------------------------------------===//
130 /// DbgScope - This class is used to track scope information.
133 DbgScope *Parent; // Parent to this scope.
134 DIDescriptor Desc; // Debug info descriptor for scope.
135 // Location at which this scope is inlined.
136 AssertingVH<const MDNode> InlinedAtLocation;
137 bool AbstractScope; // Abstract Scope
138 const MachineInstr *LastInsn; // Last instruction of this scope.
139 const MachineInstr *FirstInsn; // First instruction of this scope.
140 unsigned DFSIn, DFSOut;
141 // Scopes defined in scope. Contents not owned.
142 SmallVector<DbgScope *, 4> Scopes;
143 // Variables declared in scope. Contents owned.
144 SmallVector<DbgVariable *, 8> Variables;
145 SmallVector<DbgRange, 4> Ranges;
146 // Private state for dump()
147 mutable unsigned IndentLevel;
149 DbgScope(DbgScope *P, DIDescriptor D, const MDNode *I = 0)
150 : Parent(P), Desc(D), InlinedAtLocation(I), AbstractScope(false),
151 LastInsn(0), FirstInsn(0),
152 DFSIn(0), DFSOut(0), IndentLevel(0) {}
156 DbgScope *getParent() const { return Parent; }
157 void setParent(DbgScope *P) { Parent = P; }
158 DIDescriptor getDesc() const { return Desc; }
159 const MDNode *getInlinedAt() const { return InlinedAtLocation; }
160 const MDNode *getScopeNode() const { return Desc; }
161 const SmallVector<DbgScope *, 4> &getScopes() { return Scopes; }
162 const SmallVector<DbgVariable *, 8> &getDbgVariables() { return Variables; }
163 const SmallVector<DbgRange, 4> &getRanges() { return Ranges; }
165 /// openInsnRange - This scope covers instruction range starting from MI.
166 void openInsnRange(const MachineInstr *MI) {
171 Parent->openInsnRange(MI);
174 /// extendInsnRange - Extend the current instruction range covered by
176 void extendInsnRange(const MachineInstr *MI) {
177 assert (FirstInsn && "MI Range is not open!");
180 Parent->extendInsnRange(MI);
183 /// closeInsnRange - Create a range based on FirstInsn and LastInsn collected
184 /// until now. This is used when a new scope is encountered while walking
185 /// machine instructions.
186 void closeInsnRange(DbgScope *NewScope = NULL) {
187 assert (LastInsn && "Last insn missing!");
188 Ranges.push_back(DbgRange(FirstInsn, LastInsn));
191 // If Parent dominates NewScope then do not close Parent's instruction
193 if (Parent && (!NewScope || !Parent->dominates(NewScope)))
194 Parent->closeInsnRange(NewScope);
197 void setAbstractScope() { AbstractScope = true; }
198 bool isAbstractScope() const { return AbstractScope; }
200 // Depth First Search support to walk and mainpluate DbgScope hierarchy.
201 unsigned getDFSOut() const { return DFSOut; }
202 void setDFSOut(unsigned O) { DFSOut = O; }
203 unsigned getDFSIn() const { return DFSIn; }
204 void setDFSIn(unsigned I) { DFSIn = I; }
205 bool dominates(const DbgScope *S) {
208 if (DFSIn < S->getDFSIn() && DFSOut > S->getDFSOut())
213 /// addScope - Add a scope to the scope.
215 void addScope(DbgScope *S) { Scopes.push_back(S); }
217 /// addVariable - Add a variable to the scope.
219 void addVariable(DbgVariable *V) { Variables.push_back(V); }
226 } // end llvm namespace
229 void DbgScope::dump() const {
230 raw_ostream &err = dbgs();
231 err.indent(IndentLevel);
232 err << "DFSIn: " << DFSIn << " DFSOut: " << DFSOut << "\n";
233 const MDNode *N = Desc;
236 err << "Abstract Scope\n";
240 err << "Children ...\n";
241 for (unsigned i = 0, e = Scopes.size(); i != e; ++i)
242 if (Scopes[i] != this)
249 DbgScope::~DbgScope() {
250 for (unsigned j = 0, M = Variables.size(); j < M; ++j)
254 DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
255 : Asm(A), MMI(Asm->MMI), FirstCU(0),
256 AbbreviationsSet(InitAbbreviationsSetSize),
257 CurrentFnDbgScope(0), PrevLabel(NULL) {
258 NextStringPoolNumber = 0;
260 DwarfInfoSectionSym = DwarfAbbrevSectionSym = 0;
261 DwarfStrSectionSym = TextSectionSym = 0;
262 DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = 0;
263 FunctionBeginSym = FunctionEndSym = 0;
265 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
269 DwarfDebug::~DwarfDebug() {
272 MCSymbol *DwarfDebug::getStringPoolEntry(StringRef Str) {
273 std::pair<MCSymbol*, unsigned> &Entry = StringPool[Str];
274 if (Entry.first) return Entry.first;
276 Entry.second = NextStringPoolNumber++;
277 return Entry.first = Asm->GetTempSymbol("string", Entry.second);
281 /// assignAbbrevNumber - Define a unique number for the abbreviation.
283 void DwarfDebug::assignAbbrevNumber(DIEAbbrev &Abbrev) {
284 // Profile the node so that we can make it unique.
288 // Check the set for priors.
289 DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
291 // If it's newly added.
292 if (InSet == &Abbrev) {
293 // Add to abbreviation list.
294 Abbreviations.push_back(&Abbrev);
296 // Assign the vector position + 1 as its number.
297 Abbrev.setNumber(Abbreviations.size());
299 // Assign existing abbreviation number.
300 Abbrev.setNumber(InSet->getNumber());
304 /// getRealLinkageName - If special LLVM prefix that is used to inform the asm
305 /// printer to not emit usual symbol prefix before the symbol name is used then
306 /// return linkage name after skipping this special LLVM prefix.
307 static StringRef getRealLinkageName(StringRef LinkageName) {
309 if (LinkageName.startswith(StringRef(&One, 1)))
310 return LinkageName.substr(1);
314 /// createSubprogramDIE - Create new DIE using SP.
315 DIE *DwarfDebug::createSubprogramDIE(DISubprogram SP) {
316 CompileUnit *SPCU = getCompileUnit(SP);
317 DIE *SPDie = SPCU->getDIE(SP);
321 SPDie = new DIE(dwarf::DW_TAG_subprogram);
323 // DW_TAG_inlined_subroutine may refer to this DIE.
324 SPCU->insertDIE(SP, SPDie);
326 // Add to context owner.
327 SPCU->addToContextOwner(SPDie, SP.getContext());
329 // Add function template parameters.
330 SPCU->addTemplateParams(*SPDie, SP.getTemplateParams());
332 StringRef LinkageName = SP.getLinkageName();
333 if (!LinkageName.empty())
334 SPCU->addString(SPDie, dwarf::DW_AT_MIPS_linkage_name, dwarf::DW_FORM_string,
335 getRealLinkageName(LinkageName));
337 // If this DIE is going to refer declaration info using AT_specification
338 // then there is no need to add other attributes.
339 if (SP.getFunctionDeclaration().isSubprogram())
342 // Constructors and operators for anonymous aggregates do not have names.
343 if (!SP.getName().empty())
344 SPCU->addString(SPDie, dwarf::DW_AT_name, dwarf::DW_FORM_string,
347 SPCU->addSourceLine(SPDie, SP);
349 if (SP.isPrototyped())
350 SPCU->addUInt(SPDie, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
353 DICompositeType SPTy = SP.getType();
354 DIArray Args = SPTy.getTypeArray();
355 unsigned SPTag = SPTy.getTag();
357 if (Args.getNumElements() == 0 || SPTag != dwarf::DW_TAG_subroutine_type)
358 SPCU->addType(SPDie, SPTy);
360 SPCU->addType(SPDie, DIType(Args.getElement(0)));
362 unsigned VK = SP.getVirtuality();
364 SPCU->addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_flag, VK);
365 DIEBlock *Block = SPCU->getDIEBlock();
366 SPCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
367 SPCU->addUInt(Block, 0, dwarf::DW_FORM_udata, SP.getVirtualIndex());
368 SPCU->addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, 0, Block);
369 ContainingTypeMap.insert(std::make_pair(SPDie,
370 SP.getContainingType()));
373 if (!SP.isDefinition()) {
374 SPCU->addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
376 // Add arguments. Do not add arguments for subprogram definition. They will
377 // be handled while processing variables.
378 DICompositeType SPTy = SP.getType();
379 DIArray Args = SPTy.getTypeArray();
380 unsigned SPTag = SPTy.getTag();
382 if (SPTag == dwarf::DW_TAG_subroutine_type)
383 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
384 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
385 DIType ATy = DIType(DIType(Args.getElement(i)));
386 SPCU->addType(Arg, ATy);
387 if (ATy.isArtificial())
388 SPCU->addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
389 SPDie->addChild(Arg);
393 if (SP.isArtificial())
394 SPCU->addUInt(SPDie, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
396 if (!SP.isLocalToUnit())
397 SPCU->addUInt(SPDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
399 if (SP.isOptimized())
400 SPCU->addUInt(SPDie, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
402 if (unsigned isa = Asm->getISAEncoding()) {
403 SPCU->addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
409 DbgScope *DwarfDebug::getOrCreateAbstractScope(const MDNode *N) {
410 assert(N && "Invalid Scope encoding!");
412 DbgScope *AScope = AbstractScopes.lookup(N);
416 DbgScope *Parent = NULL;
418 DIDescriptor Scope(N);
419 if (Scope.isLexicalBlock()) {
420 DILexicalBlock DB(N);
421 DIDescriptor ParentDesc = DB.getContext();
422 Parent = getOrCreateAbstractScope(ParentDesc);
425 AScope = new DbgScope(Parent, DIDescriptor(N), NULL);
428 Parent->addScope(AScope);
429 AScope->setAbstractScope();
430 AbstractScopes[N] = AScope;
431 if (DIDescriptor(N).isSubprogram())
432 AbstractScopesList.push_back(AScope);
436 /// isSubprogramContext - Return true if Context is either a subprogram
437 /// or another context nested inside a subprogram.
438 static bool isSubprogramContext(const MDNode *Context) {
441 DIDescriptor D(Context);
442 if (D.isSubprogram())
445 return isSubprogramContext(DIType(Context).getContext());
449 /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
450 /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
451 /// If there are global variables in this scope then create and insert
452 /// DIEs for these variables.
453 DIE *DwarfDebug::updateSubprogramScopeDIE(const MDNode *SPNode) {
454 CompileUnit *SPCU = getCompileUnit(SPNode);
455 DIE *SPDie = SPCU->getDIE(SPNode);
457 assert(SPDie && "Unable to find subprogram DIE!");
458 DISubprogram SP(SPNode);
460 DISubprogram SPDecl = SP.getFunctionDeclaration();
461 if (SPDecl.isSubprogram())
462 // Refer function declaration directly.
463 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification, dwarf::DW_FORM_ref4,
464 createSubprogramDIE(SPDecl));
466 // There is not any need to generate specification DIE for a function
467 // defined at compile unit level. If a function is defined inside another
468 // function then gdb prefers the definition at top level and but does not
469 // expect specification DIE in parent function. So avoid creating
470 // specification DIE for a function defined inside a function.
471 if (SP.isDefinition() && !SP.getContext().isCompileUnit() &&
472 !SP.getContext().isFile() &&
473 !isSubprogramContext(SP.getContext())) {
474 SPCU-> addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
477 DICompositeType SPTy = SP.getType();
478 DIArray Args = SPTy.getTypeArray();
479 unsigned SPTag = SPTy.getTag();
480 if (SPTag == dwarf::DW_TAG_subroutine_type)
481 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
482 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
483 DIType ATy = DIType(DIType(Args.getElement(i)));
484 SPCU->addType(Arg, ATy);
485 if (ATy.isArtificial())
486 SPCU->addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
487 SPDie->addChild(Arg);
489 DIE *SPDeclDie = SPDie;
490 SPDie = new DIE(dwarf::DW_TAG_subprogram);
491 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification, dwarf::DW_FORM_ref4,
496 // Pick up abstract subprogram DIE.
497 if (DIE *AbsSPDIE = AbstractSPDies.lookup(SPNode)) {
498 SPDie = new DIE(dwarf::DW_TAG_subprogram);
499 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_abstract_origin,
500 dwarf::DW_FORM_ref4, AbsSPDIE);
504 SPCU->addLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
505 Asm->GetTempSymbol("func_begin", Asm->getFunctionNumber()));
506 SPCU->addLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
507 Asm->GetTempSymbol("func_end", Asm->getFunctionNumber()));
508 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
509 MachineLocation Location(RI->getFrameRegister(*Asm->MF));
510 SPCU->addAddress(SPDie, dwarf::DW_AT_frame_base, Location);
515 /// constructLexicalScope - Construct new DW_TAG_lexical_block
516 /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
517 DIE *DwarfDebug::constructLexicalScopeDIE(DbgScope *Scope) {
519 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_lexical_block);
520 if (Scope->isAbstractScope())
523 const SmallVector<DbgRange, 4> &Ranges = Scope->getRanges();
527 CompileUnit *TheCU = getCompileUnit(Scope->getScopeNode());
528 SmallVector<DbgRange, 4>::const_iterator RI = Ranges.begin();
529 if (Ranges.size() > 1) {
530 // .debug_range section has not been laid out yet. Emit offset in
531 // .debug_range as a uint, size 4, for now. emitDIE will handle
532 // DW_AT_ranges appropriately.
533 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_ranges, dwarf::DW_FORM_data4,
534 DebugRangeSymbols.size() * Asm->getTargetData().getPointerSize());
535 for (SmallVector<DbgRange, 4>::const_iterator RI = Ranges.begin(),
536 RE = Ranges.end(); RI != RE; ++RI) {
537 DebugRangeSymbols.push_back(getLabelBeforeInsn(RI->first));
538 DebugRangeSymbols.push_back(getLabelAfterInsn(RI->second));
540 DebugRangeSymbols.push_back(NULL);
541 DebugRangeSymbols.push_back(NULL);
545 const MCSymbol *Start = getLabelBeforeInsn(RI->first);
546 const MCSymbol *End = getLabelAfterInsn(RI->second);
548 if (End == 0) return 0;
550 assert(Start->isDefined() && "Invalid starting label for an inlined scope!");
551 assert(End->isDefined() && "Invalid end label for an inlined scope!");
553 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, Start);
554 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr, End);
559 /// constructInlinedScopeDIE - This scope represents inlined body of
560 /// a function. Construct DIE to represent this concrete inlined copy
562 DIE *DwarfDebug::constructInlinedScopeDIE(DbgScope *Scope) {
564 const SmallVector<DbgRange, 4> &Ranges = Scope->getRanges();
565 assert (Ranges.empty() == false
566 && "DbgScope does not have instruction markers!");
568 // FIXME : .debug_inlined section specification does not clearly state how
569 // to emit inlined scope that is split into multiple instruction ranges.
570 // For now, use first instruction range and emit low_pc/high_pc pair and
571 // corresponding .debug_inlined section entry for this pair.
572 SmallVector<DbgRange, 4>::const_iterator RI = Ranges.begin();
573 const MCSymbol *StartLabel = getLabelBeforeInsn(RI->first);
574 const MCSymbol *EndLabel = getLabelAfterInsn(RI->second);
576 if (StartLabel == 0 || EndLabel == 0) {
577 assert (0 && "Unexpected Start and End labels for a inlined scope!");
580 assert(StartLabel->isDefined() &&
581 "Invalid starting label for an inlined scope!");
582 assert(EndLabel->isDefined() &&
583 "Invalid end label for an inlined scope!");
585 if (!Scope->getScopeNode())
587 DIScope DS(Scope->getScopeNode());
588 DISubprogram InlinedSP = getDISubprogram(DS);
589 CompileUnit *TheCU = getCompileUnit(InlinedSP);
590 DIE *OriginDIE = TheCU->getDIE(InlinedSP);
592 DEBUG(dbgs() << "Unable to find original DIE for inlined subprogram.");
595 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine);
596 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin,
597 dwarf::DW_FORM_ref4, OriginDIE);
599 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, StartLabel);
600 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr, EndLabel);
602 InlinedSubprogramDIEs.insert(OriginDIE);
604 // Track the start label for this inlined function.
605 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator
606 I = InlineInfo.find(InlinedSP);
608 if (I == InlineInfo.end()) {
609 InlineInfo[InlinedSP].push_back(std::make_pair(StartLabel,
611 InlinedSPNodes.push_back(InlinedSP);
613 I->second.push_back(std::make_pair(StartLabel, ScopeDIE));
615 DILocation DL(Scope->getInlinedAt());
616 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_file, 0, TheCU->getID());
617 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_line, 0, DL.getLineNumber());
622 /// isUnsignedDIType - Return true if type encoding is unsigned.
623 static bool isUnsignedDIType(DIType Ty) {
624 DIDerivedType DTy(Ty);
626 return isUnsignedDIType(DTy.getTypeDerivedFrom());
630 unsigned Encoding = BTy.getEncoding();
631 if (Encoding == dwarf::DW_ATE_unsigned ||
632 Encoding == dwarf::DW_ATE_unsigned_char)
638 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
639 DIE *DwarfDebug::constructVariableDIE(DbgVariable *DV, DbgScope *Scope) {
640 StringRef Name = DV->getName();
644 // Translate tag to proper Dwarf tag. The result variable is dropped for
647 switch (DV->getTag()) {
648 case dwarf::DW_TAG_return_variable:
650 case dwarf::DW_TAG_arg_variable:
651 Tag = dwarf::DW_TAG_formal_parameter;
653 case dwarf::DW_TAG_auto_variable: // fall thru
655 Tag = dwarf::DW_TAG_variable;
659 // Define variable debug information entry.
660 DIE *VariableDie = new DIE(Tag);
661 CompileUnit *VariableCU = getCompileUnit(DV->getVariable());
663 DenseMap<const DbgVariable *, const DbgVariable *>::iterator
664 V2AVI = VarToAbstractVarMap.find(DV);
665 if (V2AVI != VarToAbstractVarMap.end())
666 AbsDIE = V2AVI->second->getDIE();
669 VariableCU->addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin,
670 dwarf::DW_FORM_ref4, AbsDIE);
672 VariableCU->addString(VariableDie, dwarf::DW_AT_name, dwarf::DW_FORM_string,
674 VariableCU->addSourceLine(VariableDie, DV->getVariable());
676 // Add variable type.
677 VariableCU->addType(VariableDie, DV->getType());
680 if (Tag == dwarf::DW_TAG_formal_parameter && DV->getType().isArtificial())
681 VariableCU->addUInt(VariableDie, dwarf::DW_AT_artificial,
682 dwarf::DW_FORM_flag, 1);
683 else if (DIVariable(DV->getVariable()).isArtificial())
684 VariableCU->addUInt(VariableDie, dwarf::DW_AT_artificial,
685 dwarf::DW_FORM_flag, 1);
687 if (Scope->isAbstractScope()) {
688 DV->setDIE(VariableDie);
692 // Add variable address.
694 unsigned Offset = DV->getDotDebugLocOffset();
696 VariableCU->addLabel(VariableDie, dwarf::DW_AT_location, dwarf::DW_FORM_data4,
697 Asm->GetTempSymbol("debug_loc", Offset));
698 DV->setDIE(VariableDie);
699 UseDotDebugLocEntry.insert(VariableDie);
703 // Check if variable is described by a DBG_VALUE instruction.
704 DenseMap<const DbgVariable *, const MachineInstr *>::iterator DVI =
705 DbgVariableToDbgInstMap.find(DV);
706 if (DVI != DbgVariableToDbgInstMap.end()) {
707 const MachineInstr *DVInsn = DVI->second;
708 bool updated = false;
709 // FIXME : Handle getNumOperands != 3
710 if (DVInsn->getNumOperands() == 3) {
711 if (DVInsn->getOperand(0).isReg()) {
712 const MachineOperand RegOp = DVInsn->getOperand(0);
713 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
714 if (DVInsn->getOperand(1).isImm() &&
715 TRI->getFrameRegister(*Asm->MF) == RegOp.getReg()) {
716 unsigned FrameReg = 0;
717 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
719 TFI->getFrameIndexReference(*Asm->MF,
720 DVInsn->getOperand(1).getImm(),
722 MachineLocation Location(FrameReg, Offset);
723 VariableCU->addVariableAddress(DV, VariableDie, Location);
725 } else if (RegOp.getReg())
726 VariableCU->addVariableAddress(DV, VariableDie,
727 MachineLocation(RegOp.getReg()));
730 else if (DVInsn->getOperand(0).isImm())
732 VariableCU->addConstantValue(VariableDie, DVInsn->getOperand(0),
734 else if (DVInsn->getOperand(0).isFPImm())
736 VariableCU->addConstantFPValue(VariableDie, DVInsn->getOperand(0));
737 else if (DVInsn->getOperand(0).isCImm())
739 VariableCU->addConstantValue(VariableDie,
740 DVInsn->getOperand(0).getCImm(),
741 isUnsignedDIType(DV->getType()));
743 VariableCU->addVariableAddress(DV, VariableDie,
744 Asm->getDebugValueLocation(DVInsn));
748 // If variableDie is not updated then DBG_VALUE instruction does not
749 // have valid variable info.
753 DV->setDIE(VariableDie);
757 // .. else use frame index, if available.
759 if (findVariableFrameIndex(DV, &FI)) {
760 unsigned FrameReg = 0;
761 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
763 TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
764 MachineLocation Location(FrameReg, Offset);
765 VariableCU->addVariableAddress(DV, VariableDie, Location);
768 DV->setDIE(VariableDie);
773 /// constructScopeDIE - Construct a DIE for this scope.
774 DIE *DwarfDebug::constructScopeDIE(DbgScope *Scope) {
775 if (!Scope || !Scope->getScopeNode())
778 SmallVector <DIE *, 8> Children;
780 // Collect arguments for current function.
781 if (Scope == CurrentFnDbgScope)
782 for (unsigned i = 0, N = CurrentFnArguments.size(); i < N; ++i)
783 if (DbgVariable *ArgDV = CurrentFnArguments[i])
784 if (DIE *Arg = constructVariableDIE(ArgDV, Scope))
785 Children.push_back(Arg);
787 // Collect lexical scope childrens first.
788 const SmallVector<DbgVariable *, 8> &Variables = Scope->getDbgVariables();
789 for (unsigned i = 0, N = Variables.size(); i < N; ++i)
790 if (DIE *Variable = constructVariableDIE(Variables[i], Scope))
791 Children.push_back(Variable);
792 const SmallVector<DbgScope *, 4> &Scopes = Scope->getScopes();
793 for (unsigned j = 0, M = Scopes.size(); j < M; ++j)
794 if (DIE *Nested = constructScopeDIE(Scopes[j]))
795 Children.push_back(Nested);
796 DIScope DS(Scope->getScopeNode());
797 DIE *ScopeDIE = NULL;
798 if (Scope->getInlinedAt())
799 ScopeDIE = constructInlinedScopeDIE(Scope);
800 else if (DS.isSubprogram()) {
801 ProcessedSPNodes.insert(DS);
802 if (Scope->isAbstractScope()) {
803 ScopeDIE = getCompileUnit(DS)->getDIE(DS);
804 // Note down abstract DIE.
806 AbstractSPDies.insert(std::make_pair(DS, ScopeDIE));
809 ScopeDIE = updateSubprogramScopeDIE(DS);
812 // There is no need to emit empty lexical block DIE.
813 if (Children.empty())
815 ScopeDIE = constructLexicalScopeDIE(Scope);
818 if (!ScopeDIE) return NULL;
821 for (SmallVector<DIE *, 8>::iterator I = Children.begin(),
822 E = Children.end(); I != E; ++I)
823 ScopeDIE->addChild(*I);
825 if (DS.isSubprogram())
826 getCompileUnit(DS)->addPubTypes(DISubprogram(DS));
831 /// GetOrCreateSourceID - Look up the source id with the given directory and
832 /// source file names. If none currently exists, create a new id and insert it
833 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames
836 unsigned DwarfDebug::GetOrCreateSourceID(StringRef FileName,
838 // If FE did not provide a file name, then assume stdin.
839 if (FileName.empty())
840 return GetOrCreateSourceID("<stdin>", StringRef());
842 // MCStream expects full path name as filename.
843 if (!DirName.empty() && !sys::path::is_absolute(FileName)) {
844 SmallString<128> FullPathName = DirName;
845 sys::path::append(FullPathName, FileName);
846 // Here FullPathName will be copied into StringMap by GetOrCreateSourceID.
847 return GetOrCreateSourceID(StringRef(FullPathName), StringRef());
850 StringMapEntry<unsigned> &Entry = SourceIdMap.GetOrCreateValue(FileName);
851 if (Entry.getValue())
852 return Entry.getValue();
854 unsigned SrcId = SourceIdMap.size();
855 Entry.setValue(SrcId);
857 // Print out a .file directive to specify files for .loc directives.
858 Asm->OutStreamer.EmitDwarfFileDirective(SrcId, Entry.getKey());
863 /// constructCompileUnit - Create new CompileUnit for the given
864 /// metadata node with tag DW_TAG_compile_unit.
865 void DwarfDebug::constructCompileUnit(const MDNode *N) {
866 DICompileUnit DIUnit(N);
867 StringRef FN = DIUnit.getFilename();
868 StringRef Dir = DIUnit.getDirectory();
869 unsigned ID = GetOrCreateSourceID(FN, Dir);
871 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
872 CompileUnit *NewCU = new CompileUnit(ID, Die, Asm, this);
873 NewCU->addString(Die, dwarf::DW_AT_producer, dwarf::DW_FORM_string,
874 DIUnit.getProducer());
875 NewCU->addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
876 DIUnit.getLanguage());
877 NewCU->addString(Die, dwarf::DW_AT_name, dwarf::DW_FORM_string, FN);
878 // Use DW_AT_entry_pc instead of DW_AT_low_pc/DW_AT_high_pc pair. This
879 // simplifies debug range entries.
880 NewCU->addUInt(Die, dwarf::DW_AT_entry_pc, dwarf::DW_FORM_addr, 0);
881 // DW_AT_stmt_list is a offset of line number information for this
882 // compile unit in debug_line section.
883 if(Asm->MAI->doesDwarfRequireRelocationForSectionOffset())
884 NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
885 Asm->GetTempSymbol("section_line"));
887 NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0);
890 NewCU->addString(Die, dwarf::DW_AT_comp_dir, dwarf::DW_FORM_string, Dir);
891 if (DIUnit.isOptimized())
892 NewCU->addUInt(Die, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
894 StringRef Flags = DIUnit.getFlags();
896 NewCU->addString(Die, dwarf::DW_AT_APPLE_flags, dwarf::DW_FORM_string, Flags);
898 unsigned RVer = DIUnit.getRunTimeVersion();
900 NewCU->addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
901 dwarf::DW_FORM_data1, RVer);
905 CUMap.insert(std::make_pair(N, NewCU));
908 /// getCompielUnit - Get CompileUnit DIE.
909 CompileUnit *DwarfDebug::getCompileUnit(const MDNode *N) const {
910 assert (N && "Invalid DwarfDebug::getCompileUnit argument!");
912 const MDNode *CUNode = NULL;
913 if (D.isCompileUnit())
915 else if (D.isSubprogram())
916 CUNode = DISubprogram(N).getCompileUnit();
918 CUNode = DIType(N).getCompileUnit();
919 else if (D.isGlobalVariable())
920 CUNode = DIGlobalVariable(N).getCompileUnit();
921 else if (D.isVariable())
922 CUNode = DIVariable(N).getCompileUnit();
923 else if (D.isNameSpace())
924 CUNode = DINameSpace(N).getCompileUnit();
926 CUNode = DIFile(N).getCompileUnit();
930 DenseMap<const MDNode *, CompileUnit *>::const_iterator I
931 = CUMap.find(CUNode);
932 if (I == CUMap.end())
937 // Return const exprssion if value is a GEP to access merged global
939 // i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
940 static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
941 const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
942 if (!CE || CE->getNumOperands() != 3 ||
943 CE->getOpcode() != Instruction::GetElementPtr)
946 // First operand points to a global value.
947 if (!isa<GlobalValue>(CE->getOperand(0)))
950 // Second operand is zero.
951 const ConstantInt *CI =
952 dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
953 if (!CI || !CI->isZero())
956 // Third operand is offset.
957 if (!isa<ConstantInt>(CE->getOperand(2)))
963 /// constructGlobalVariableDIE - Construct global variable DIE.
964 void DwarfDebug::constructGlobalVariableDIE(const MDNode *N) {
965 DIGlobalVariable GV(N);
967 // If debug information is malformed then ignore it.
968 if (GV.Verify() == false)
971 // Check for pre-existence.
972 CompileUnit *TheCU = getCompileUnit(N);
973 if (TheCU->getDIE(GV))
976 DIType GTy = GV.getType();
977 DIE *VariableDIE = new DIE(GV.getTag());
979 bool isGlobalVariable = GV.getGlobal() != NULL;
982 TheCU->addString(VariableDIE, dwarf::DW_AT_name, dwarf::DW_FORM_string,
983 GV.getDisplayName());
984 StringRef LinkageName = GV.getLinkageName();
985 if (!LinkageName.empty() && isGlobalVariable)
986 TheCU->addString(VariableDIE, dwarf::DW_AT_MIPS_linkage_name,
987 dwarf::DW_FORM_string,
988 getRealLinkageName(LinkageName));
990 TheCU->addType(VariableDIE, GTy);
993 if (!GV.isLocalToUnit()) {
994 TheCU->addUInt(VariableDIE, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
996 TheCU->addGlobal(GV.getName(), VariableDIE);
998 // Add line number info.
999 TheCU->addSourceLine(VariableDIE, GV);
1001 TheCU->insertDIE(N, VariableDIE);
1002 // Add to context owner.
1003 DIDescriptor GVContext = GV.getContext();
1004 TheCU->addToContextOwner(VariableDIE, GVContext);
1006 if (isGlobalVariable) {
1007 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1008 TheCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
1009 TheCU->addLabel(Block, 0, dwarf::DW_FORM_udata,
1010 Asm->Mang->getSymbol(GV.getGlobal()));
1011 // Do not create specification DIE if context is either compile unit
1013 if (GV.isDefinition() && !GVContext.isCompileUnit() &&
1014 !GVContext.isFile() && !isSubprogramContext(GVContext)) {
1015 // Create specification DIE.
1016 DIE *VariableSpecDIE = new DIE(dwarf::DW_TAG_variable);
1017 TheCU->addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification,
1018 dwarf::DW_FORM_ref4, VariableDIE);
1019 TheCU->addBlock(VariableSpecDIE, dwarf::DW_AT_location, 0, Block);
1020 TheCU->addUInt(VariableDIE, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
1021 TheCU->addDie(VariableSpecDIE);
1023 TheCU->addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
1025 } else if (const ConstantInt *CI =
1026 dyn_cast_or_null<ConstantInt>(GV.getConstant()))
1027 TheCU->addConstantValue(VariableDIE, CI, isUnsignedDIType(GTy));
1028 else if (const ConstantExpr *CE = getMergedGlobalExpr(N->getOperand(11))) {
1029 // GV is a merged global.
1030 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1031 TheCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
1032 TheCU->addLabel(Block, 0, dwarf::DW_FORM_udata,
1033 Asm->Mang->getSymbol(cast<GlobalValue>(CE->getOperand(0))));
1034 ConstantInt *CII = cast<ConstantInt>(CE->getOperand(2));
1035 TheCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1036 TheCU->addUInt(Block, 0, dwarf::DW_FORM_udata, CII->getZExtValue());
1037 TheCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1038 TheCU->addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
1044 /// construct SubprogramDIE - Construct subprogram DIE.
1045 void DwarfDebug::constructSubprogramDIE(const MDNode *N) {
1048 // Check for pre-existence.
1049 CompileUnit *TheCU = getCompileUnit(N);
1050 if (TheCU->getDIE(N))
1053 if (!SP.isDefinition())
1054 // This is a method declaration which will be handled while constructing
1058 DIE *SubprogramDie = createSubprogramDIE(SP);
1061 TheCU->insertDIE(N, SubprogramDie);
1063 // Add to context owner.
1064 TheCU->addToContextOwner(SubprogramDie, SP.getContext());
1066 // Expose as global.
1067 TheCU->addGlobal(SP.getName(), SubprogramDie);
1072 /// beginModule - Emit all Dwarf sections that should come prior to the
1073 /// content. Create global DIEs and emit initial debug info sections.
1074 /// This is inovked by the target AsmPrinter.
1075 void DwarfDebug::beginModule(Module *M) {
1076 if (DisableDebugInfoPrinting)
1079 // If module has named metadata anchors then use them, otherwise scan the module
1080 // using debug info finder to collect debug info.
1081 NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
1084 NamedMDNode *GV_Nodes = M->getNamedMetadata("llvm.dbg.gv");
1085 NamedMDNode *SP_Nodes = M->getNamedMetadata("llvm.dbg.sp");
1086 if (!GV_Nodes && !SP_Nodes)
1087 // If there are not any global variables or any functions then
1088 // there is not any debug info in this module.
1091 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i)
1092 constructCompileUnit(CU_Nodes->getOperand(i));
1095 for (unsigned i = 0, e = GV_Nodes->getNumOperands(); i != e; ++i)
1096 constructGlobalVariableDIE(GV_Nodes->getOperand(i));
1099 for (unsigned i = 0, e = SP_Nodes->getNumOperands(); i != e; ++i)
1100 constructSubprogramDIE(SP_Nodes->getOperand(i));
1104 DebugInfoFinder DbgFinder;
1105 DbgFinder.processModule(*M);
1107 bool HasDebugInfo = false;
1108 // Scan all the compile-units to see if there are any marked as the main unit.
1109 // if not, we do not generate debug info.
1110 for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
1111 E = DbgFinder.compile_unit_end(); I != E; ++I) {
1112 if (DICompileUnit(*I).isMain()) {
1113 HasDebugInfo = true;
1117 if (!HasDebugInfo) return;
1119 // Create all the compile unit DIEs.
1120 for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
1121 E = DbgFinder.compile_unit_end(); I != E; ++I)
1122 constructCompileUnit(*I);
1124 // Create DIEs for each global variable.
1125 for (DebugInfoFinder::iterator I = DbgFinder.global_variable_begin(),
1126 E = DbgFinder.global_variable_end(); I != E; ++I)
1127 constructGlobalVariableDIE(*I);
1129 // Create DIEs for each subprogram.
1130 for (DebugInfoFinder::iterator I = DbgFinder.subprogram_begin(),
1131 E = DbgFinder.subprogram_end(); I != E; ++I)
1132 constructSubprogramDIE(*I);
1135 // Tell MMI that we have debug info.
1136 MMI->setDebugInfoAvailability(true);
1138 // Emit initial sections.
1139 EmitSectionLabels();
1141 //getOrCreateTypeDIE
1142 if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.enum"))
1143 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1144 DIType Ty(NMD->getOperand(i));
1145 getCompileUnit(Ty)->getOrCreateTypeDIE(Ty);
1148 if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.ty"))
1149 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1150 DIType Ty(NMD->getOperand(i));
1151 getCompileUnit(Ty)->getOrCreateTypeDIE(Ty);
1154 // Prime section data.
1155 SectionMap.insert(Asm->getObjFileLowering().getTextSection());
1158 /// endModule - Emit all Dwarf sections that should come after the content.
1160 void DwarfDebug::endModule() {
1161 if (!FirstCU) return;
1162 const Module *M = MMI->getModule();
1163 DenseMap<const MDNode *, DbgScope *> DeadFnScopeMap;
1164 if (NamedMDNode *AllSPs = M->getNamedMetadata("llvm.dbg.sp")) {
1165 for (unsigned SI = 0, SE = AllSPs->getNumOperands(); SI != SE; ++SI) {
1166 if (ProcessedSPNodes.count(AllSPs->getOperand(SI)) != 0) continue;
1167 DISubprogram SP(AllSPs->getOperand(SI));
1168 if (!SP.Verify()) continue;
1170 // Collect info for variables that were optimized out.
1171 if (!SP.isDefinition()) continue;
1172 StringRef FName = SP.getLinkageName();
1174 FName = SP.getName();
1175 NamedMDNode *NMD = getFnSpecificMDNode(*(MMI->getModule()), FName);
1177 unsigned E = NMD->getNumOperands();
1179 DbgScope *Scope = new DbgScope(NULL, DIDescriptor(SP), NULL);
1180 DeadFnScopeMap[SP] = Scope;
1181 for (unsigned I = 0; I != E; ++I) {
1182 DIVariable DV(NMD->getOperand(I));
1183 if (!DV.Verify()) continue;
1184 Scope->addVariable(new DbgVariable(DV));
1187 // Construct subprogram DIE and add variables DIEs.
1188 constructSubprogramDIE(SP);
1189 DIE *ScopeDIE = getCompileUnit(SP)->getDIE(SP);
1190 const SmallVector<DbgVariable *, 8> &Variables = Scope->getDbgVariables();
1191 for (unsigned i = 0, N = Variables.size(); i < N; ++i) {
1192 DIE *VariableDIE = constructVariableDIE(Variables[i], Scope);
1194 ScopeDIE->addChild(VariableDIE);
1199 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
1200 for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(),
1201 AE = InlinedSubprogramDIEs.end(); AI != AE; ++AI) {
1203 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, 0, dwarf::DW_INL_inlined);
1206 for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
1207 CE = ContainingTypeMap.end(); CI != CE; ++CI) {
1208 DIE *SPDie = CI->first;
1209 const MDNode *N = dyn_cast_or_null<MDNode>(CI->second);
1211 DIE *NDie = getCompileUnit(N)->getDIE(N);
1212 if (!NDie) continue;
1213 getCompileUnit(N)->addDIEEntry(SPDie, dwarf::DW_AT_containing_type,
1214 dwarf::DW_FORM_ref4, NDie);
1217 // Standard sections final addresses.
1218 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getTextSection());
1219 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("text_end"));
1220 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getDataSection());
1221 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("data_end"));
1223 // End text sections.
1224 for (unsigned i = 1, N = SectionMap.size(); i <= N; ++i) {
1225 Asm->OutStreamer.SwitchSection(SectionMap[i]);
1226 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_end", i));
1229 // Compute DIE offsets and sizes.
1230 computeSizeAndOffsets();
1232 // Emit all the DIEs into a debug info section
1235 // Corresponding abbreviations into a abbrev section.
1236 emitAbbreviations();
1238 // Emit info into a debug pubnames section.
1239 emitDebugPubNames();
1241 // Emit info into a debug pubtypes section.
1242 emitDebugPubTypes();
1244 // Emit info into a debug loc section.
1247 // Emit info into a debug aranges section.
1250 // Emit info into a debug ranges section.
1253 // Emit info into a debug macinfo section.
1256 // Emit inline info.
1257 emitDebugInlineInfo();
1259 // Emit info into a debug str section.
1263 DeleteContainerSeconds(DeadFnScopeMap);
1264 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
1265 E = CUMap.end(); I != E; ++I)
1267 FirstCU = NULL; // Reset for the next Module, if any.
1270 /// findAbstractVariable - Find abstract variable, if any, associated with Var.
1271 DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &Var,
1272 DebugLoc ScopeLoc) {
1274 DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var);
1276 return AbsDbgVariable;
1278 LLVMContext &Ctx = Var->getContext();
1279 DbgScope *Scope = AbstractScopes.lookup(ScopeLoc.getScope(Ctx));
1283 AbsDbgVariable = new DbgVariable(Var);
1284 Scope->addVariable(AbsDbgVariable);
1285 AbstractVariables[Var] = AbsDbgVariable;
1286 return AbsDbgVariable;
1289 /// addCurrentFnArgument - If Var is an current function argument that add
1290 /// it in CurrentFnArguments list.
1291 bool DwarfDebug::addCurrentFnArgument(const MachineFunction *MF,
1292 DbgVariable *Var, DbgScope *Scope) {
1293 if (Scope != CurrentFnDbgScope)
1295 DIVariable DV = Var->getVariable();
1296 if (DV.getTag() != dwarf::DW_TAG_arg_variable)
1298 unsigned ArgNo = DV.getArgNumber();
1302 size_t Size = CurrentFnArguments.size();
1304 CurrentFnArguments.resize(MF->getFunction()->arg_size());
1305 // llvm::Function argument size is not good indicator of how many
1306 // arguments does the function have at source level.
1308 CurrentFnArguments.resize(ArgNo * 2);
1309 CurrentFnArguments[ArgNo - 1] = Var;
1313 /// collectVariableInfoFromMMITable - Collect variable information from
1314 /// side table maintained by MMI.
1316 DwarfDebug::collectVariableInfoFromMMITable(const MachineFunction * MF,
1317 SmallPtrSet<const MDNode *, 16> &Processed) {
1318 const LLVMContext &Ctx = Asm->MF->getFunction()->getContext();
1319 MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
1320 for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
1321 VE = VMap.end(); VI != VE; ++VI) {
1322 const MDNode *Var = VI->first;
1324 Processed.insert(Var);
1326 const std::pair<unsigned, DebugLoc> &VP = VI->second;
1328 DbgScope *Scope = 0;
1329 if (const MDNode *IA = VP.second.getInlinedAt(Ctx))
1330 Scope = ConcreteScopes.lookup(IA);
1332 Scope = DbgScopeMap.lookup(VP.second.getScope(Ctx));
1334 // If variable scope is not found then skip this variable.
1338 DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
1339 DbgVariable *RegVar = new DbgVariable(DV);
1340 recordVariableFrameIndex(RegVar, VP.first);
1341 if (!addCurrentFnArgument(MF, RegVar, Scope))
1342 Scope->addVariable(RegVar);
1343 if (AbsDbgVariable) {
1344 recordVariableFrameIndex(AbsDbgVariable, VP.first);
1345 VarToAbstractVarMap[RegVar] = AbsDbgVariable;
1350 /// isDbgValueInDefinedReg - Return true if debug value, encoded by
1351 /// DBG_VALUE instruction, is in a defined reg.
1352 static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
1353 assert (MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
1354 return MI->getNumOperands() == 3 &&
1355 MI->getOperand(0).isReg() && MI->getOperand(0).getReg() &&
1356 MI->getOperand(1).isImm() && MI->getOperand(1).getImm() == 0;
1359 /// getDebugLocEntry - Get .debug_loc entry for the instraction range starting
1361 static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
1362 const MCSymbol *FLabel,
1363 const MCSymbol *SLabel,
1364 const MachineInstr *MI) {
1365 const MDNode *Var = MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1367 if (MI->getNumOperands() != 3) {
1368 MachineLocation MLoc = Asm->getDebugValueLocation(MI);
1369 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1371 if (MI->getOperand(0).isReg() && MI->getOperand(1).isImm()) {
1372 MachineLocation MLoc;
1373 MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
1374 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1376 if (MI->getOperand(0).isImm())
1377 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getImm());
1378 if (MI->getOperand(0).isFPImm())
1379 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getFPImm());
1380 if (MI->getOperand(0).isCImm())
1381 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getCImm());
1383 assert (0 && "Unexpected 3 operand DBG_VALUE instruction!");
1384 return DotDebugLocEntry();
1387 /// collectVariableInfo - Populate DbgScope entries with variables' info.
1389 DwarfDebug::collectVariableInfo(const MachineFunction *MF,
1390 SmallPtrSet<const MDNode *, 16> &Processed) {
1392 /// collection info from MMI table.
1393 collectVariableInfoFromMMITable(MF, Processed);
1395 for (SmallVectorImpl<const MDNode*>::const_iterator
1396 UVI = UserVariables.begin(), UVE = UserVariables.end(); UVI != UVE;
1398 const MDNode *Var = *UVI;
1399 if (Processed.count(Var))
1402 // History contains relevant DBG_VALUE instructions for Var and instructions
1404 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1405 if (History.empty())
1407 const MachineInstr *MInsn = History.front();
1410 DbgScope *Scope = NULL;
1411 if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
1412 DISubprogram(DV.getContext()).describes(MF->getFunction()))
1413 Scope = CurrentFnDbgScope;
1415 Scope = findDbgScope(MInsn);
1416 // If variable scope is not found then skip this variable.
1420 Processed.insert(DV);
1421 assert(MInsn->isDebugValue() && "History must begin with debug value");
1422 DbgVariable *RegVar = new DbgVariable(DV);
1423 if (!addCurrentFnArgument(MF, RegVar, Scope))
1424 Scope->addVariable(RegVar);
1425 if (DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc())) {
1426 DbgVariableToDbgInstMap[AbsVar] = MInsn;
1427 VarToAbstractVarMap[RegVar] = AbsVar;
1430 // Simple ranges that are fully coalesced.
1431 if (History.size() <= 1 || (History.size() == 2 &&
1432 MInsn->isIdenticalTo(History.back()))) {
1433 DbgVariableToDbgInstMap[RegVar] = MInsn;
1437 // handle multiple DBG_VALUE instructions describing one variable.
1438 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1440 for (SmallVectorImpl<const MachineInstr*>::const_iterator
1441 HI = History.begin(), HE = History.end(); HI != HE; ++HI) {
1442 const MachineInstr *Begin = *HI;
1443 assert(Begin->isDebugValue() && "Invalid History entry");
1445 // Check if DBG_VALUE is truncating a range.
1446 if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg()
1447 && !Begin->getOperand(0).getReg())
1450 // Compute the range for a register location.
1451 const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
1452 const MCSymbol *SLabel = 0;
1455 // If Begin is the last instruction in History then its value is valid
1456 // until the end of the function.
1457 SLabel = FunctionEndSym;
1459 const MachineInstr *End = HI[1];
1460 DEBUG(dbgs() << "DotDebugLoc Pair:\n"
1461 << "\t" << *Begin << "\t" << *End << "\n");
1462 if (End->isDebugValue())
1463 SLabel = getLabelBeforeInsn(End);
1465 // End is a normal instruction clobbering the range.
1466 SLabel = getLabelAfterInsn(End);
1467 assert(SLabel && "Forgot label after clobber instruction");
1472 // The value is valid until the next DBG_VALUE or clobber.
1473 DotDebugLocEntries.push_back(getDebugLocEntry(Asm, FLabel, SLabel, Begin));
1475 DotDebugLocEntries.push_back(DotDebugLocEntry());
1478 // Collect info for variables that were optimized out.
1479 const Function *F = MF->getFunction();
1480 if (NamedMDNode *NMD = getFnSpecificMDNode(*(F->getParent()), F->getName())) {
1481 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1482 DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
1483 if (!DV || !Processed.insert(DV))
1485 DbgScope *Scope = DbgScopeMap.lookup(DV.getContext());
1487 Scope->addVariable(new DbgVariable(DV));
1492 /// getLabelBeforeInsn - Return Label preceding the instruction.
1493 const MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1494 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1495 assert(Label && "Didn't insert label before instruction");
1499 /// getLabelAfterInsn - Return Label immediately following the instruction.
1500 const MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1501 return LabelsAfterInsn.lookup(MI);
1504 /// beginInstruction - Process beginning of an instruction.
1505 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1506 // Check if source location changes, but ignore DBG_VALUE locations.
1507 if (!MI->isDebugValue()) {
1508 DebugLoc DL = MI->getDebugLoc();
1509 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1510 unsigned Flags = DWARF2_FLAG_IS_STMT;
1512 if (DL == PrologEndLoc) {
1513 Flags |= DWARF2_FLAG_PROLOGUE_END;
1514 PrologEndLoc = DebugLoc();
1516 if (!DL.isUnknown()) {
1517 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1518 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1520 recordSourceLine(0, 0, 0, 0);
1524 // Insert labels where requested.
1525 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1526 LabelsBeforeInsn.find(MI);
1529 if (I == LabelsBeforeInsn.end())
1532 // Label already assigned.
1537 PrevLabel = MMI->getContext().CreateTempSymbol();
1538 Asm->OutStreamer.EmitLabel(PrevLabel);
1540 I->second = PrevLabel;
1543 /// endInstruction - Process end of an instruction.
1544 void DwarfDebug::endInstruction(const MachineInstr *MI) {
1545 // Don't create a new label after DBG_VALUE instructions.
1546 // They don't generate code.
1547 if (!MI->isDebugValue())
1550 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1551 LabelsAfterInsn.find(MI);
1554 if (I == LabelsAfterInsn.end())
1557 // Label already assigned.
1561 // We need a label after this instruction.
1563 PrevLabel = MMI->getContext().CreateTempSymbol();
1564 Asm->OutStreamer.EmitLabel(PrevLabel);
1566 I->second = PrevLabel;
1569 /// getOrCreateDbgScope - Create DbgScope for the scope.
1570 DbgScope *DwarfDebug::getOrCreateDbgScope(DebugLoc DL) {
1571 LLVMContext &Ctx = Asm->MF->getFunction()->getContext();
1572 MDNode *Scope = NULL;
1573 MDNode *InlinedAt = NULL;
1574 DL.getScopeAndInlinedAt(Scope, InlinedAt, Ctx);
1577 DbgScope *WScope = DbgScopeMap.lookup(Scope);
1580 WScope = new DbgScope(NULL, DIDescriptor(Scope), NULL);
1581 DbgScopeMap.insert(std::make_pair(Scope, WScope));
1582 if (DIDescriptor(Scope).isLexicalBlock()) {
1584 getOrCreateDbgScope(DebugLoc::getFromDILexicalBlock(Scope));
1585 WScope->setParent(Parent);
1586 Parent->addScope(WScope);
1587 } else if (DIDescriptor(Scope).isSubprogram()
1588 && DISubprogram(Scope).describes(Asm->MF->getFunction()))
1589 CurrentFnDbgScope = WScope;
1594 getOrCreateAbstractScope(Scope);
1595 DbgScope *WScope = DbgScopeMap.lookup(InlinedAt);
1599 WScope = new DbgScope(NULL, DIDescriptor(Scope), InlinedAt);
1600 DbgScopeMap.insert(std::make_pair(InlinedAt, WScope));
1602 getOrCreateDbgScope(DebugLoc::getFromDILocation(InlinedAt));
1603 WScope->setParent(Parent);
1604 Parent->addScope(WScope);
1606 ConcreteScopes[InlinedAt] = WScope;
1611 /// calculateDominanceGraph - Calculate dominance graph for DbgScope
1613 static void calculateDominanceGraph(DbgScope *Scope) {
1614 assert (Scope && "Unable to calculate scop edominance graph!");
1615 SmallVector<DbgScope *, 4> WorkStack;
1616 WorkStack.push_back(Scope);
1617 unsigned Counter = 0;
1618 while (!WorkStack.empty()) {
1619 DbgScope *WS = WorkStack.back();
1620 const SmallVector<DbgScope *, 4> &Children = WS->getScopes();
1621 bool visitedChildren = false;
1622 for (SmallVector<DbgScope *, 4>::const_iterator SI = Children.begin(),
1623 SE = Children.end(); SI != SE; ++SI) {
1624 DbgScope *ChildScope = *SI;
1625 if (!ChildScope->getDFSOut()) {
1626 WorkStack.push_back(ChildScope);
1627 visitedChildren = true;
1628 ChildScope->setDFSIn(++Counter);
1632 if (!visitedChildren) {
1633 WorkStack.pop_back();
1634 WS->setDFSOut(++Counter);
1639 /// printDbgScopeInfo - Print DbgScope info for each machine instruction.
1641 void printDbgScopeInfo(const MachineFunction *MF,
1642 DenseMap<const MachineInstr *, DbgScope *> &MI2ScopeMap)
1645 LLVMContext &Ctx = MF->getFunction()->getContext();
1646 unsigned PrevDFSIn = 0;
1647 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1649 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1651 const MachineInstr *MInsn = II;
1652 MDNode *Scope = NULL;
1653 MDNode *InlinedAt = NULL;
1655 // Check if instruction has valid location information.
1656 DebugLoc MIDL = MInsn->getDebugLoc();
1657 if (!MIDL.isUnknown()) {
1658 MIDL.getScopeAndInlinedAt(Scope, InlinedAt, Ctx);
1662 DenseMap<const MachineInstr *, DbgScope *>::iterator DI =
1663 MI2ScopeMap.find(MInsn);
1664 if (DI != MI2ScopeMap.end()) {
1665 DbgScope *S = DI->second;
1666 dbgs() << S->getDFSIn();
1667 PrevDFSIn = S->getDFSIn();
1669 dbgs() << PrevDFSIn;
1671 dbgs() << " [ x" << PrevDFSIn;
1679 /// extractScopeInformation - Scan machine instructions in this function
1680 /// and collect DbgScopes. Return true, if at least one scope was found.
1681 bool DwarfDebug::extractScopeInformation() {
1682 // If scope information was extracted using .dbg intrinsics then there is not
1683 // any need to extract these information by scanning each instruction.
1684 if (!DbgScopeMap.empty())
1687 // Scan each instruction and create scopes. First build working set of scopes.
1688 SmallVector<DbgRange, 4> MIRanges;
1689 DenseMap<const MachineInstr *, DbgScope *> MI2ScopeMap;
1691 const MachineInstr *RangeBeginMI = NULL;
1692 const MachineInstr *PrevMI = NULL;
1693 for (MachineFunction::const_iterator I = Asm->MF->begin(), E = Asm->MF->end();
1695 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1697 const MachineInstr *MInsn = II;
1699 // Check if instruction has valid location information.
1700 const DebugLoc MIDL = MInsn->getDebugLoc();
1701 if (MIDL.isUnknown()) {
1706 // If scope has not changed then skip this instruction.
1707 if (MIDL == PrevDL) {
1712 // Ignore DBG_VALUE. It does not contribute any instruction in output.
1713 if (MInsn->isDebugValue())
1717 // If we have alread seen a beginning of a instruction range and
1718 // current instruction scope does not match scope of first instruction
1719 // in this range then create a new instruction range.
1720 DEBUG(dbgs() << "Creating new instruction range :\n");
1721 DEBUG(dbgs() << "Begin Range at " << *RangeBeginMI);
1722 DEBUG(dbgs() << "End Range at " << *PrevMI);
1723 DEBUG(dbgs() << "Next Range starting at " << *MInsn);
1724 DEBUG(dbgs() << "------------------------\n");
1725 DbgRange R(RangeBeginMI, PrevMI);
1726 MI2ScopeMap[RangeBeginMI] = getOrCreateDbgScope(PrevDL);
1727 MIRanges.push_back(R);
1730 // This is a beginning of a new instruction range.
1731 RangeBeginMI = MInsn;
1733 // Reset previous markers.
1739 // Create last instruction range.
1740 if (RangeBeginMI && PrevMI && !PrevDL.isUnknown()) {
1741 DbgRange R(RangeBeginMI, PrevMI);
1742 MIRanges.push_back(R);
1743 MI2ScopeMap[RangeBeginMI] = getOrCreateDbgScope(PrevDL);
1746 if (!CurrentFnDbgScope)
1749 calculateDominanceGraph(CurrentFnDbgScope);
1751 printDbgScopeInfo(Asm->MF, MI2ScopeMap);
1753 // Find ranges of instructions covered by each DbgScope;
1754 DbgScope *PrevDbgScope = NULL;
1755 for (SmallVector<DbgRange, 4>::const_iterator RI = MIRanges.begin(),
1756 RE = MIRanges.end(); RI != RE; ++RI) {
1757 const DbgRange &R = *RI;
1758 DbgScope *S = MI2ScopeMap.lookup(R.first);
1759 assert (S && "Lost DbgScope for a machine instruction!");
1760 if (PrevDbgScope && !PrevDbgScope->dominates(S))
1761 PrevDbgScope->closeInsnRange(S);
1762 S->openInsnRange(R.first);
1763 S->extendInsnRange(R.second);
1768 PrevDbgScope->closeInsnRange();
1770 identifyScopeMarkers();
1772 return !DbgScopeMap.empty();
1775 /// identifyScopeMarkers() -
1776 /// Each DbgScope has first instruction and last instruction to mark beginning
1777 /// and end of a scope respectively. Create an inverse map that list scopes
1778 /// starts (and ends) with an instruction. One instruction may start (or end)
1779 /// multiple scopes. Ignore scopes that are not reachable.
1780 void DwarfDebug::identifyScopeMarkers() {
1781 SmallVector<DbgScope *, 4> WorkList;
1782 WorkList.push_back(CurrentFnDbgScope);
1783 while (!WorkList.empty()) {
1784 DbgScope *S = WorkList.pop_back_val();
1786 const SmallVector<DbgScope *, 4> &Children = S->getScopes();
1787 if (!Children.empty())
1788 for (SmallVector<DbgScope *, 4>::const_iterator SI = Children.begin(),
1789 SE = Children.end(); SI != SE; ++SI)
1790 WorkList.push_back(*SI);
1792 if (S->isAbstractScope())
1795 const SmallVector<DbgRange, 4> &Ranges = S->getRanges();
1798 for (SmallVector<DbgRange, 4>::const_iterator RI = Ranges.begin(),
1799 RE = Ranges.end(); RI != RE; ++RI) {
1800 assert(RI->first && "DbgRange does not have first instruction!");
1801 assert(RI->second && "DbgRange does not have second instruction!");
1802 requestLabelBeforeInsn(RI->first);
1803 requestLabelAfterInsn(RI->second);
1808 /// getScopeNode - Get MDNode for DebugLoc's scope.
1809 static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
1810 if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
1811 return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
1812 return DL.getScope(Ctx);
1815 /// getFnDebugLoc - Walk up the scope chain of given debug loc and find
1816 /// line number info for the function.
1817 static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
1818 const MDNode *Scope = getScopeNode(DL, Ctx);
1819 DISubprogram SP = getDISubprogram(Scope);
1821 return DebugLoc::get(SP.getLineNumber(), 0, SP);
1825 /// beginFunction - Gather pre-function debug information. Assumes being
1826 /// emitted immediately after the function entry point.
1827 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1828 if (!MMI->hasDebugInfo()) return;
1829 if (!extractScopeInformation()) return;
1831 FunctionBeginSym = Asm->GetTempSymbol("func_begin",
1832 Asm->getFunctionNumber());
1833 // Assumes in correct section after the entry point.
1834 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1836 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
1838 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1839 /// LiveUserVar - Map physreg numbers to the MDNode they contain.
1840 std::vector<const MDNode*> LiveUserVar(TRI->getNumRegs());
1842 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1844 bool AtBlockEntry = true;
1845 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1847 const MachineInstr *MI = II;
1849 if (MI->isDebugValue()) {
1850 assert (MI->getNumOperands() > 1 && "Invalid machine instruction!");
1852 // Keep track of user variables.
1854 MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1856 // Variable is in a register, we need to check for clobbers.
1857 if (isDbgValueInDefinedReg(MI))
1858 LiveUserVar[MI->getOperand(0).getReg()] = Var;
1860 // Check the history of this variable.
1861 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1862 if (History.empty()) {
1863 UserVariables.push_back(Var);
1864 // The first mention of a function argument gets the FunctionBeginSym
1865 // label, so arguments are visible when breaking at function entry.
1867 if (DV.Verify() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
1868 DISubprogram(getDISubprogram(DV.getContext()))
1869 .describes(MF->getFunction()))
1870 LabelsBeforeInsn[MI] = FunctionBeginSym;
1872 // We have seen this variable before. Try to coalesce DBG_VALUEs.
1873 const MachineInstr *Prev = History.back();
1874 if (Prev->isDebugValue()) {
1875 // Coalesce identical entries at the end of History.
1876 if (History.size() >= 2 &&
1877 Prev->isIdenticalTo(History[History.size() - 2])) {
1878 DEBUG(dbgs() << "Coalesce identical DBG_VALUE entries:\n"
1880 << "\t" << *History[History.size() - 2] << "\n");
1884 // Terminate old register assignments that don't reach MI;
1885 MachineFunction::const_iterator PrevMBB = Prev->getParent();
1886 if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
1887 isDbgValueInDefinedReg(Prev)) {
1888 // Previous register assignment needs to terminate at the end of
1890 MachineBasicBlock::const_iterator LastMI =
1891 PrevMBB->getLastNonDebugInstr();
1892 if (LastMI == PrevMBB->end()) {
1893 // Drop DBG_VALUE for empty range.
1894 DEBUG(dbgs() << "Drop DBG_VALUE for empty range:\n"
1895 << "\t" << *Prev << "\n");
1899 // Terminate after LastMI.
1900 History.push_back(LastMI);
1905 History.push_back(MI);
1907 // Not a DBG_VALUE instruction.
1909 AtBlockEntry = false;
1911 // First known non DBG_VALUE location marks beginning of function
1913 if (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown())
1914 PrologEndLoc = MI->getDebugLoc();
1916 // Check if the instruction clobbers any registers with debug vars.
1917 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
1918 MOE = MI->operands_end(); MOI != MOE; ++MOI) {
1919 if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
1921 for (const unsigned *AI = TRI->getOverlaps(MOI->getReg());
1922 unsigned Reg = *AI; ++AI) {
1923 const MDNode *Var = LiveUserVar[Reg];
1926 // Reg is now clobbered.
1927 LiveUserVar[Reg] = 0;
1929 // Was MD last defined by a DBG_VALUE referring to Reg?
1930 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
1931 if (HistI == DbgValues.end())
1933 SmallVectorImpl<const MachineInstr*> &History = HistI->second;
1934 if (History.empty())
1936 const MachineInstr *Prev = History.back();
1937 // Sanity-check: Register assignments are terminated at the end of
1939 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
1941 // Is the variable still in Reg?
1942 if (!isDbgValueInDefinedReg(Prev) ||
1943 Prev->getOperand(0).getReg() != Reg)
1945 // Var is clobbered. Make sure the next instruction gets a label.
1946 History.push_back(MI);
1953 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
1955 SmallVectorImpl<const MachineInstr*> &History = I->second;
1956 if (History.empty())
1959 // Make sure the final register assignments are terminated.
1960 const MachineInstr *Prev = History.back();
1961 if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
1962 const MachineBasicBlock *PrevMBB = Prev->getParent();
1963 MachineBasicBlock::const_iterator LastMI = PrevMBB->getLastNonDebugInstr();
1964 if (LastMI == PrevMBB->end())
1965 // Drop DBG_VALUE for empty range.
1968 // Terminate after LastMI.
1969 History.push_back(LastMI);
1972 // Request labels for the full history.
1973 for (unsigned i = 0, e = History.size(); i != e; ++i) {
1974 const MachineInstr *MI = History[i];
1975 if (MI->isDebugValue())
1976 requestLabelBeforeInsn(MI);
1978 requestLabelAfterInsn(MI);
1982 PrevInstLoc = DebugLoc();
1983 PrevLabel = FunctionBeginSym;
1985 // Record beginning of function.
1986 if (!PrologEndLoc.isUnknown()) {
1987 DebugLoc FnStartDL = getFnDebugLoc(PrologEndLoc,
1988 MF->getFunction()->getContext());
1989 recordSourceLine(FnStartDL.getLine(), FnStartDL.getCol(),
1990 FnStartDL.getScope(MF->getFunction()->getContext()),
1991 DWARF2_FLAG_IS_STMT);
1995 /// endFunction - Gather and emit post-function debug information.
1997 void DwarfDebug::endFunction(const MachineFunction *MF) {
1998 if (!MMI->hasDebugInfo() || DbgScopeMap.empty()) return;
2000 if (CurrentFnDbgScope) {
2002 // Define end label for subprogram.
2003 FunctionEndSym = Asm->GetTempSymbol("func_end",
2004 Asm->getFunctionNumber());
2005 // Assumes in correct section after the entry point.
2006 Asm->OutStreamer.EmitLabel(FunctionEndSym);
2008 SmallPtrSet<const MDNode *, 16> ProcessedVars;
2009 collectVariableInfo(MF, ProcessedVars);
2011 // Construct abstract scopes.
2012 for (SmallVector<DbgScope *, 4>::iterator AI = AbstractScopesList.begin(),
2013 AE = AbstractScopesList.end(); AI != AE; ++AI) {
2014 DISubprogram SP((*AI)->getScopeNode());
2016 // Collect info for variables that were optimized out.
2017 StringRef FName = SP.getLinkageName();
2019 FName = SP.getName();
2020 if (NamedMDNode *NMD =
2021 getFnSpecificMDNode(*(MF->getFunction()->getParent()), FName)) {
2022 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2023 DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
2024 if (!DV || !ProcessedVars.insert(DV))
2026 DbgScope *Scope = AbstractScopes.lookup(DV.getContext());
2028 Scope->addVariable(new DbgVariable(DV));
2032 if (ProcessedSPNodes.count((*AI)->getScopeNode()) == 0)
2033 constructScopeDIE(*AI);
2036 DIE *CurFnDIE = constructScopeDIE(CurrentFnDbgScope);
2038 if (!DisableFramePointerElim(*MF))
2039 getCompileUnit(CurrentFnDbgScope->getScopeNode())->addUInt(CurFnDIE,
2040 dwarf::DW_AT_APPLE_omit_frame_ptr,
2041 dwarf::DW_FORM_flag, 1);
2044 DebugFrames.push_back(FunctionDebugFrameInfo(Asm->getFunctionNumber(),
2045 MMI->getFrameMoves()));
2049 CurrentFnDbgScope = NULL;
2050 DeleteContainerPointers(CurrentFnArguments);
2051 DbgVariableToFrameIndexMap.clear();
2052 VarToAbstractVarMap.clear();
2053 DbgVariableToDbgInstMap.clear();
2054 DeleteContainerSeconds(DbgScopeMap);
2055 UserVariables.clear();
2057 ConcreteScopes.clear();
2058 DeleteContainerSeconds(AbstractScopes);
2059 AbstractScopesList.clear();
2060 AbstractVariables.clear();
2061 LabelsBeforeInsn.clear();
2062 LabelsAfterInsn.clear();
2066 /// recordVariableFrameIndex - Record a variable's index.
2067 void DwarfDebug::recordVariableFrameIndex(const DbgVariable *V, int Index) {
2068 assert (V && "Invalid DbgVariable!");
2069 DbgVariableToFrameIndexMap[V] = Index;
2072 /// findVariableFrameIndex - Return true if frame index for the variable
2073 /// is found. Update FI to hold value of the index.
2074 bool DwarfDebug::findVariableFrameIndex(const DbgVariable *V, int *FI) {
2075 assert (V && "Invalid DbgVariable!");
2076 DenseMap<const DbgVariable *, int>::iterator I =
2077 DbgVariableToFrameIndexMap.find(V);
2078 if (I == DbgVariableToFrameIndexMap.end())
2084 /// findDbgScope - Find DbgScope for the debug loc attached with an
2086 DbgScope *DwarfDebug::findDbgScope(const MachineInstr *MInsn) {
2087 DbgScope *Scope = NULL;
2089 MInsn->getParent()->getParent()->getFunction()->getContext();
2090 DebugLoc DL = MInsn->getDebugLoc();
2095 if (const MDNode *IA = DL.getInlinedAt(Ctx))
2096 Scope = ConcreteScopes.lookup(IA);
2098 Scope = DbgScopeMap.lookup(DL.getScope(Ctx));
2104 /// recordSourceLine - Register a source line with debug info. Returns the
2105 /// unique label that was emitted and which provides correspondence to
2106 /// the source line list.
2107 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
2113 DIDescriptor Scope(S);
2115 if (Scope.isCompileUnit()) {
2116 DICompileUnit CU(S);
2117 Fn = CU.getFilename();
2118 Dir = CU.getDirectory();
2119 } else if (Scope.isFile()) {
2121 Fn = F.getFilename();
2122 Dir = F.getDirectory();
2123 } else if (Scope.isSubprogram()) {
2125 Fn = SP.getFilename();
2126 Dir = SP.getDirectory();
2127 } else if (Scope.isLexicalBlock()) {
2128 DILexicalBlock DB(S);
2129 Fn = DB.getFilename();
2130 Dir = DB.getDirectory();
2132 assert(0 && "Unexpected scope info");
2134 Src = GetOrCreateSourceID(Fn, Dir);
2136 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags,
2140 //===----------------------------------------------------------------------===//
2142 //===----------------------------------------------------------------------===//
2144 /// computeSizeAndOffset - Compute the size and offset of a DIE.
2147 DwarfDebug::computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last) {
2148 // Get the children.
2149 const std::vector<DIE *> &Children = Die->getChildren();
2151 // If not last sibling and has children then add sibling offset attribute.
2152 if (!Last && !Children.empty())
2153 Die->addSiblingOffset(DIEValueAllocator);
2155 // Record the abbreviation.
2156 assignAbbrevNumber(Die->getAbbrev());
2158 // Get the abbreviation for this DIE.
2159 unsigned AbbrevNumber = Die->getAbbrevNumber();
2160 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2163 Die->setOffset(Offset);
2165 // Start the size with the size of abbreviation code.
2166 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
2168 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2169 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2171 // Size the DIE attribute values.
2172 for (unsigned i = 0, N = Values.size(); i < N; ++i)
2173 // Size attribute value.
2174 Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
2176 // Size the DIE children if any.
2177 if (!Children.empty()) {
2178 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
2179 "Children flag not set");
2181 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2182 Offset = computeSizeAndOffset(Children[j], Offset, (j + 1) == M);
2184 // End of children marker.
2185 Offset += sizeof(int8_t);
2188 Die->setSize(Offset - Die->getOffset());
2192 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
2194 void DwarfDebug::computeSizeAndOffsets() {
2195 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2196 E = CUMap.end(); I != E; ++I) {
2197 // Compute size of compile unit header.
2199 sizeof(int32_t) + // Length of Compilation Unit Info
2200 sizeof(int16_t) + // DWARF version number
2201 sizeof(int32_t) + // Offset Into Abbrev. Section
2202 sizeof(int8_t); // Pointer Size (in bytes)
2203 computeSizeAndOffset(I->second->getCUDie(), Offset, true);
2207 /// EmitSectionSym - Switch to the specified MCSection and emit an assembler
2208 /// temporary label to it if SymbolStem is specified.
2209 static MCSymbol *EmitSectionSym(AsmPrinter *Asm, const MCSection *Section,
2210 const char *SymbolStem = 0) {
2211 Asm->OutStreamer.SwitchSection(Section);
2212 if (!SymbolStem) return 0;
2214 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
2215 Asm->OutStreamer.EmitLabel(TmpSym);
2219 /// EmitSectionLabels - Emit initial Dwarf sections with a label at
2220 /// the start of each one.
2221 void DwarfDebug::EmitSectionLabels() {
2222 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
2224 // Dwarf sections base addresses.
2225 DwarfInfoSectionSym =
2226 EmitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
2227 DwarfAbbrevSectionSym =
2228 EmitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
2229 EmitSectionSym(Asm, TLOF.getDwarfARangesSection());
2231 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
2232 EmitSectionSym(Asm, MacroInfo);
2234 EmitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
2235 EmitSectionSym(Asm, TLOF.getDwarfLocSection());
2236 EmitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
2237 EmitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
2238 DwarfStrSectionSym =
2239 EmitSectionSym(Asm, TLOF.getDwarfStrSection(), "section_str");
2240 DwarfDebugRangeSectionSym = EmitSectionSym(Asm, TLOF.getDwarfRangesSection(),
2243 DwarfDebugLocSectionSym = EmitSectionSym(Asm, TLOF.getDwarfLocSection(),
2244 "section_debug_loc");
2246 TextSectionSym = EmitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
2247 EmitSectionSym(Asm, TLOF.getDataSection());
2250 /// emitDIE - Recusively Emits a debug information entry.
2252 void DwarfDebug::emitDIE(DIE *Die) {
2253 // Get the abbreviation for this DIE.
2254 unsigned AbbrevNumber = Die->getAbbrevNumber();
2255 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2257 // Emit the code (index) for the abbreviation.
2258 if (Asm->isVerbose())
2259 Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
2260 Twine::utohexstr(Die->getOffset()) + ":0x" +
2261 Twine::utohexstr(Die->getSize()) + " " +
2262 dwarf::TagString(Abbrev->getTag()));
2263 Asm->EmitULEB128(AbbrevNumber);
2265 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2266 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2268 // Emit the DIE attribute values.
2269 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2270 unsigned Attr = AbbrevData[i].getAttribute();
2271 unsigned Form = AbbrevData[i].getForm();
2272 assert(Form && "Too many attributes for DIE (check abbreviation)");
2274 if (Asm->isVerbose())
2275 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
2278 case dwarf::DW_AT_sibling:
2279 Asm->EmitInt32(Die->getSiblingOffset());
2281 case dwarf::DW_AT_abstract_origin: {
2282 DIEEntry *E = cast<DIEEntry>(Values[i]);
2283 DIE *Origin = E->getEntry();
2284 unsigned Addr = Origin->getOffset();
2285 Asm->EmitInt32(Addr);
2288 case dwarf::DW_AT_ranges: {
2289 // DW_AT_range Value encodes offset in debug_range section.
2290 DIEInteger *V = cast<DIEInteger>(Values[i]);
2292 if (Asm->MAI->doesDwarfUsesLabelOffsetForRanges()) {
2293 Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym,
2297 Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
2299 DwarfDebugRangeSectionSym,
2304 case dwarf::DW_AT_location: {
2305 if (UseDotDebugLocEntry.count(Die) != 0) {
2306 DIELabel *L = cast<DIELabel>(Values[i]);
2307 Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
2309 Values[i]->EmitValue(Asm, Form);
2312 case dwarf::DW_AT_accessibility: {
2313 if (Asm->isVerbose()) {
2314 DIEInteger *V = cast<DIEInteger>(Values[i]);
2315 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
2317 Values[i]->EmitValue(Asm, Form);
2321 // Emit an attribute using the defined form.
2322 Values[i]->EmitValue(Asm, Form);
2327 // Emit the DIE children if any.
2328 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
2329 const std::vector<DIE *> &Children = Die->getChildren();
2331 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2332 emitDIE(Children[j]);
2334 if (Asm->isVerbose())
2335 Asm->OutStreamer.AddComment("End Of Children Mark");
2340 /// emitDebugInfo - Emit the debug info section.
2342 void DwarfDebug::emitDebugInfo() {
2343 // Start debug info section.
2344 Asm->OutStreamer.SwitchSection(
2345 Asm->getObjFileLowering().getDwarfInfoSection());
2346 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2347 E = CUMap.end(); I != E; ++I) {
2348 CompileUnit *TheCU = I->second;
2349 DIE *Die = TheCU->getCUDie();
2351 // Emit the compile units header.
2352 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_begin",
2355 // Emit size of content not including length itself
2356 unsigned ContentSize = Die->getSize() +
2357 sizeof(int16_t) + // DWARF version number
2358 sizeof(int32_t) + // Offset Into Abbrev. Section
2359 sizeof(int8_t); // Pointer Size (in bytes)
2361 Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
2362 Asm->EmitInt32(ContentSize);
2363 Asm->OutStreamer.AddComment("DWARF version number");
2364 Asm->EmitInt16(dwarf::DWARF_VERSION);
2365 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
2366 Asm->EmitSectionOffset(Asm->GetTempSymbol("abbrev_begin"),
2367 DwarfAbbrevSectionSym);
2368 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2369 Asm->EmitInt8(Asm->getTargetData().getPointerSize());
2372 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_end", TheCU->getID()));
2376 /// emitAbbreviations - Emit the abbreviation section.
2378 void DwarfDebug::emitAbbreviations() const {
2379 // Check to see if it is worth the effort.
2380 if (!Abbreviations.empty()) {
2381 // Start the debug abbrev section.
2382 Asm->OutStreamer.SwitchSection(
2383 Asm->getObjFileLowering().getDwarfAbbrevSection());
2385 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_begin"));
2387 // For each abbrevation.
2388 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
2389 // Get abbreviation data
2390 const DIEAbbrev *Abbrev = Abbreviations[i];
2392 // Emit the abbrevations code (base 1 index.)
2393 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
2395 // Emit the abbreviations data.
2399 // Mark end of abbreviations.
2400 Asm->EmitULEB128(0, "EOM(3)");
2402 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_end"));
2406 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
2407 /// the line matrix.
2409 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
2410 // Define last address of section.
2411 Asm->OutStreamer.AddComment("Extended Op");
2414 Asm->OutStreamer.AddComment("Op size");
2415 Asm->EmitInt8(Asm->getTargetData().getPointerSize() + 1);
2416 Asm->OutStreamer.AddComment("DW_LNE_set_address");
2417 Asm->EmitInt8(dwarf::DW_LNE_set_address);
2419 Asm->OutStreamer.AddComment("Section end label");
2421 Asm->OutStreamer.EmitSymbolValue(Asm->GetTempSymbol("section_end",SectionEnd),
2422 Asm->getTargetData().getPointerSize(),
2425 // Mark end of matrix.
2426 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
2432 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
2434 void DwarfDebug::emitDebugPubNames() {
2435 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2436 E = CUMap.end(); I != E; ++I) {
2437 CompileUnit *TheCU = I->second;
2438 // Start the dwarf pubnames section.
2439 Asm->OutStreamer.SwitchSection(
2440 Asm->getObjFileLowering().getDwarfPubNamesSection());
2442 Asm->OutStreamer.AddComment("Length of Public Names Info");
2443 Asm->EmitLabelDifference(
2444 Asm->GetTempSymbol("pubnames_end", TheCU->getID()),
2445 Asm->GetTempSymbol("pubnames_begin", TheCU->getID()), 4);
2447 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin",
2450 Asm->OutStreamer.AddComment("DWARF Version");
2451 Asm->EmitInt16(dwarf::DWARF_VERSION);
2453 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2454 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
2455 DwarfInfoSectionSym);
2457 Asm->OutStreamer.AddComment("Compilation Unit Length");
2458 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
2459 Asm->GetTempSymbol("info_begin", TheCU->getID()),
2462 const StringMap<DIE*> &Globals = TheCU->getGlobals();
2463 for (StringMap<DIE*>::const_iterator
2464 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2465 const char *Name = GI->getKeyData();
2466 DIE *Entity = GI->second;
2468 Asm->OutStreamer.AddComment("DIE offset");
2469 Asm->EmitInt32(Entity->getOffset());
2471 if (Asm->isVerbose())
2472 Asm->OutStreamer.AddComment("External Name");
2473 Asm->OutStreamer.EmitBytes(StringRef(Name, strlen(Name)+1), 0);
2476 Asm->OutStreamer.AddComment("End Mark");
2478 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_end",
2483 void DwarfDebug::emitDebugPubTypes() {
2484 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2485 E = CUMap.end(); I != E; ++I) {
2486 CompileUnit *TheCU = I->second;
2487 // Start the dwarf pubnames section.
2488 Asm->OutStreamer.SwitchSection(
2489 Asm->getObjFileLowering().getDwarfPubTypesSection());
2490 Asm->OutStreamer.AddComment("Length of Public Types Info");
2491 Asm->EmitLabelDifference(
2492 Asm->GetTempSymbol("pubtypes_end", TheCU->getID()),
2493 Asm->GetTempSymbol("pubtypes_begin", TheCU->getID()), 4);
2495 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_begin",
2498 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DWARF Version");
2499 Asm->EmitInt16(dwarf::DWARF_VERSION);
2501 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2502 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
2503 DwarfInfoSectionSym);
2505 Asm->OutStreamer.AddComment("Compilation Unit Length");
2506 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
2507 Asm->GetTempSymbol("info_begin", TheCU->getID()),
2510 const StringMap<DIE*> &Globals = TheCU->getGlobalTypes();
2511 for (StringMap<DIE*>::const_iterator
2512 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2513 const char *Name = GI->getKeyData();
2514 DIE * Entity = GI->second;
2516 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2517 Asm->EmitInt32(Entity->getOffset());
2519 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("External Name");
2520 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1), 0);
2523 Asm->OutStreamer.AddComment("End Mark");
2525 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_end",
2530 /// emitDebugStr - Emit visible names into a debug str section.
2532 void DwarfDebug::emitDebugStr() {
2533 // Check to see if it is worth the effort.
2534 if (StringPool.empty()) return;
2536 // Start the dwarf str section.
2537 Asm->OutStreamer.SwitchSection(
2538 Asm->getObjFileLowering().getDwarfStrSection());
2540 // Get all of the string pool entries and put them in an array by their ID so
2541 // we can sort them.
2542 SmallVector<std::pair<unsigned,
2543 StringMapEntry<std::pair<MCSymbol*, unsigned> >*>, 64> Entries;
2545 for (StringMap<std::pair<MCSymbol*, unsigned> >::iterator
2546 I = StringPool.begin(), E = StringPool.end(); I != E; ++I)
2547 Entries.push_back(std::make_pair(I->second.second, &*I));
2549 array_pod_sort(Entries.begin(), Entries.end());
2551 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2552 // Emit a label for reference from debug information entries.
2553 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
2555 // Emit the string itself.
2556 Asm->OutStreamer.EmitBytes(Entries[i].second->getKey(), 0/*addrspace*/);
2560 /// emitDebugLoc - Emit visible names into a debug loc section.
2562 void DwarfDebug::emitDebugLoc() {
2563 if (DotDebugLocEntries.empty())
2566 for (SmallVector<DotDebugLocEntry, 4>::iterator
2567 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2569 DotDebugLocEntry &Entry = *I;
2570 if (I + 1 != DotDebugLocEntries.end())
2574 // Start the dwarf loc section.
2575 Asm->OutStreamer.SwitchSection(
2576 Asm->getObjFileLowering().getDwarfLocSection());
2577 unsigned char Size = Asm->getTargetData().getPointerSize();
2578 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
2580 for (SmallVector<DotDebugLocEntry, 4>::iterator
2581 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2582 I != E; ++I, ++index) {
2583 DotDebugLocEntry &Entry = *I;
2584 if (Entry.isMerged()) continue;
2585 if (Entry.isEmpty()) {
2586 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2587 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2588 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
2590 Asm->OutStreamer.EmitSymbolValue(Entry.Begin, Size, 0);
2591 Asm->OutStreamer.EmitSymbolValue(Entry.End, Size, 0);
2592 DIVariable DV(Entry.Variable);
2593 Asm->OutStreamer.AddComment("Loc expr size");
2594 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
2595 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
2596 Asm->EmitLabelDifference(end, begin, 2);
2597 Asm->OutStreamer.EmitLabel(begin);
2598 if (Entry.isInt()) {
2599 DIBasicType BTy(DV.getType());
2601 (BTy.getEncoding() == dwarf::DW_ATE_signed
2602 || BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
2603 Asm->OutStreamer.AddComment("DW_OP_consts");
2604 Asm->EmitInt8(dwarf::DW_OP_consts);
2605 Asm->EmitSLEB128(Entry.getInt());
2607 Asm->OutStreamer.AddComment("DW_OP_constu");
2608 Asm->EmitInt8(dwarf::DW_OP_constu);
2609 Asm->EmitULEB128(Entry.getInt());
2611 } else if (Entry.isLocation()) {
2612 if (!DV.hasComplexAddress())
2614 Asm->EmitDwarfRegOp(Entry.Loc);
2616 // Complex address entry.
2617 unsigned N = DV.getNumAddrElements();
2619 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
2620 if (Entry.Loc.getOffset()) {
2622 Asm->EmitDwarfRegOp(Entry.Loc);
2623 Asm->OutStreamer.AddComment("DW_OP_deref");
2624 Asm->EmitInt8(dwarf::DW_OP_deref);
2625 Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
2626 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2627 Asm->EmitSLEB128(DV.getAddrElement(1));
2629 // If first address element is OpPlus then emit
2630 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
2631 MachineLocation Loc(Entry.Loc.getReg(), DV.getAddrElement(1));
2632 Asm->EmitDwarfRegOp(Loc);
2636 Asm->EmitDwarfRegOp(Entry.Loc);
2639 // Emit remaining complex address elements.
2640 for (; i < N; ++i) {
2641 uint64_t Element = DV.getAddrElement(i);
2642 if (Element == DIBuilder::OpPlus) {
2643 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2644 Asm->EmitULEB128(DV.getAddrElement(++i));
2645 } else if (Element == DIBuilder::OpDeref)
2646 Asm->EmitInt8(dwarf::DW_OP_deref);
2647 else llvm_unreachable("unknown Opcode found in complex address");
2651 // else ... ignore constant fp. There is not any good way to
2652 // to represent them here in dwarf.
2653 Asm->OutStreamer.EmitLabel(end);
2658 /// EmitDebugARanges - Emit visible names into a debug aranges section.
2660 void DwarfDebug::EmitDebugARanges() {
2661 // Start the dwarf aranges section.
2662 Asm->OutStreamer.SwitchSection(
2663 Asm->getObjFileLowering().getDwarfARangesSection());
2666 /// emitDebugRanges - Emit visible names into a debug ranges section.
2668 void DwarfDebug::emitDebugRanges() {
2669 // Start the dwarf ranges section.
2670 Asm->OutStreamer.SwitchSection(
2671 Asm->getObjFileLowering().getDwarfRangesSection());
2672 unsigned char Size = Asm->getTargetData().getPointerSize();
2673 for (SmallVector<const MCSymbol *, 8>::iterator
2674 I = DebugRangeSymbols.begin(), E = DebugRangeSymbols.end();
2677 Asm->OutStreamer.EmitSymbolValue(const_cast<MCSymbol*>(*I), Size, 0);
2679 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2683 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
2685 void DwarfDebug::emitDebugMacInfo() {
2686 if (const MCSection *LineInfo =
2687 Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
2688 // Start the dwarf macinfo section.
2689 Asm->OutStreamer.SwitchSection(LineInfo);
2693 /// emitDebugInlineInfo - Emit inline info using following format.
2695 /// 1. length of section
2696 /// 2. Dwarf version number
2697 /// 3. address size.
2699 /// Entries (one "entry" for each function that was inlined):
2701 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
2702 /// otherwise offset into __debug_str for regular function name.
2703 /// 2. offset into __debug_str section for regular function name.
2704 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
2705 /// instances for the function.
2707 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
2708 /// inlined instance; the die_offset points to the inlined_subroutine die in the
2709 /// __debug_info section, and the low_pc is the starting address for the
2710 /// inlining instance.
2711 void DwarfDebug::emitDebugInlineInfo() {
2712 if (!Asm->MAI->doesDwarfUsesInlineInfoSection())
2718 Asm->OutStreamer.SwitchSection(
2719 Asm->getObjFileLowering().getDwarfDebugInlineSection());
2721 Asm->OutStreamer.AddComment("Length of Debug Inlined Information Entry");
2722 Asm->EmitLabelDifference(Asm->GetTempSymbol("debug_inlined_end", 1),
2723 Asm->GetTempSymbol("debug_inlined_begin", 1), 4);
2725 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_begin", 1));
2727 Asm->OutStreamer.AddComment("Dwarf Version");
2728 Asm->EmitInt16(dwarf::DWARF_VERSION);
2729 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2730 Asm->EmitInt8(Asm->getTargetData().getPointerSize());
2732 for (SmallVector<const MDNode *, 4>::iterator I = InlinedSPNodes.begin(),
2733 E = InlinedSPNodes.end(); I != E; ++I) {
2735 const MDNode *Node = *I;
2736 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator II
2737 = InlineInfo.find(Node);
2738 SmallVector<InlineInfoLabels, 4> &Labels = II->second;
2739 DISubprogram SP(Node);
2740 StringRef LName = SP.getLinkageName();
2741 StringRef Name = SP.getName();
2743 Asm->OutStreamer.AddComment("MIPS linkage name");
2744 if (LName.empty()) {
2745 Asm->OutStreamer.EmitBytes(Name, 0);
2746 Asm->OutStreamer.EmitIntValue(0, 1, 0); // nul terminator.
2748 Asm->EmitSectionOffset(getStringPoolEntry(getRealLinkageName(LName)),
2749 DwarfStrSectionSym);
2751 Asm->OutStreamer.AddComment("Function name");
2752 Asm->EmitSectionOffset(getStringPoolEntry(Name), DwarfStrSectionSym);
2753 Asm->EmitULEB128(Labels.size(), "Inline count");
2755 for (SmallVector<InlineInfoLabels, 4>::iterator LI = Labels.begin(),
2756 LE = Labels.end(); LI != LE; ++LI) {
2757 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2758 Asm->EmitInt32(LI->second->getOffset());
2760 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("low_pc");
2761 Asm->OutStreamer.EmitSymbolValue(LI->first,
2762 Asm->getTargetData().getPointerSize(),0);
2766 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_end", 1));