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 MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
1319 for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
1320 VE = VMap.end(); VI != VE; ++VI) {
1321 const MDNode *Var = VI->first;
1323 Processed.insert(Var);
1325 const std::pair<unsigned, DebugLoc> &VP = VI->second;
1327 DbgScope *Scope = findDbgScope(VP.second);
1329 // If variable scope is not found then skip this variable.
1333 DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
1334 DbgVariable *RegVar = new DbgVariable(DV);
1335 recordVariableFrameIndex(RegVar, VP.first);
1336 if (!addCurrentFnArgument(MF, RegVar, Scope))
1337 Scope->addVariable(RegVar);
1338 if (AbsDbgVariable) {
1339 recordVariableFrameIndex(AbsDbgVariable, VP.first);
1340 VarToAbstractVarMap[RegVar] = AbsDbgVariable;
1345 /// isDbgValueInDefinedReg - Return true if debug value, encoded by
1346 /// DBG_VALUE instruction, is in a defined reg.
1347 static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
1348 assert (MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
1349 return MI->getNumOperands() == 3 &&
1350 MI->getOperand(0).isReg() && MI->getOperand(0).getReg() &&
1351 MI->getOperand(1).isImm() && MI->getOperand(1).getImm() == 0;
1354 /// getDebugLocEntry - Get .debug_loc entry for the instraction range starting
1356 static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
1357 const MCSymbol *FLabel,
1358 const MCSymbol *SLabel,
1359 const MachineInstr *MI) {
1360 const MDNode *Var = MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1362 if (MI->getNumOperands() != 3) {
1363 MachineLocation MLoc = Asm->getDebugValueLocation(MI);
1364 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1366 if (MI->getOperand(0).isReg() && MI->getOperand(1).isImm()) {
1367 MachineLocation MLoc;
1368 MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
1369 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1371 if (MI->getOperand(0).isImm())
1372 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getImm());
1373 if (MI->getOperand(0).isFPImm())
1374 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getFPImm());
1375 if (MI->getOperand(0).isCImm())
1376 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getCImm());
1378 assert (0 && "Unexpected 3 operand DBG_VALUE instruction!");
1379 return DotDebugLocEntry();
1382 /// collectVariableInfo - Populate DbgScope entries with variables' info.
1384 DwarfDebug::collectVariableInfo(const MachineFunction *MF,
1385 SmallPtrSet<const MDNode *, 16> &Processed) {
1387 /// collection info from MMI table.
1388 collectVariableInfoFromMMITable(MF, Processed);
1390 for (SmallVectorImpl<const MDNode*>::const_iterator
1391 UVI = UserVariables.begin(), UVE = UserVariables.end(); UVI != UVE;
1393 const MDNode *Var = *UVI;
1394 if (Processed.count(Var))
1397 // History contains relevant DBG_VALUE instructions for Var and instructions
1399 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1400 if (History.empty())
1402 const MachineInstr *MInsn = History.front();
1405 DbgScope *Scope = NULL;
1406 if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
1407 DISubprogram(DV.getContext()).describes(MF->getFunction()))
1408 Scope = CurrentFnDbgScope;
1410 Scope = findDbgScope(MInsn->getDebugLoc());
1411 // If variable scope is not found then skip this variable.
1415 Processed.insert(DV);
1416 assert(MInsn->isDebugValue() && "History must begin with debug value");
1417 DbgVariable *RegVar = new DbgVariable(DV);
1418 if (!addCurrentFnArgument(MF, RegVar, Scope))
1419 Scope->addVariable(RegVar);
1420 if (DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc())) {
1421 DbgVariableToDbgInstMap[AbsVar] = MInsn;
1422 VarToAbstractVarMap[RegVar] = AbsVar;
1425 // Simple ranges that are fully coalesced.
1426 if (History.size() <= 1 || (History.size() == 2 &&
1427 MInsn->isIdenticalTo(History.back()))) {
1428 DbgVariableToDbgInstMap[RegVar] = MInsn;
1432 // handle multiple DBG_VALUE instructions describing one variable.
1433 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1435 for (SmallVectorImpl<const MachineInstr*>::const_iterator
1436 HI = History.begin(), HE = History.end(); HI != HE; ++HI) {
1437 const MachineInstr *Begin = *HI;
1438 assert(Begin->isDebugValue() && "Invalid History entry");
1440 // Check if DBG_VALUE is truncating a range.
1441 if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg()
1442 && !Begin->getOperand(0).getReg())
1445 // Compute the range for a register location.
1446 const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
1447 const MCSymbol *SLabel = 0;
1450 // If Begin is the last instruction in History then its value is valid
1451 // until the end of the function.
1452 SLabel = FunctionEndSym;
1454 const MachineInstr *End = HI[1];
1455 DEBUG(dbgs() << "DotDebugLoc Pair:\n"
1456 << "\t" << *Begin << "\t" << *End << "\n");
1457 if (End->isDebugValue())
1458 SLabel = getLabelBeforeInsn(End);
1460 // End is a normal instruction clobbering the range.
1461 SLabel = getLabelAfterInsn(End);
1462 assert(SLabel && "Forgot label after clobber instruction");
1467 // The value is valid until the next DBG_VALUE or clobber.
1468 DotDebugLocEntries.push_back(getDebugLocEntry(Asm, FLabel, SLabel, Begin));
1470 DotDebugLocEntries.push_back(DotDebugLocEntry());
1473 // Collect info for variables that were optimized out.
1474 const Function *F = MF->getFunction();
1475 if (NamedMDNode *NMD = getFnSpecificMDNode(*(F->getParent()), F->getName())) {
1476 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1477 DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
1478 if (!DV || !Processed.insert(DV))
1480 DbgScope *Scope = DbgScopeMap.lookup(DV.getContext());
1482 Scope->addVariable(new DbgVariable(DV));
1487 /// getLabelBeforeInsn - Return Label preceding the instruction.
1488 const MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1489 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1490 assert(Label && "Didn't insert label before instruction");
1494 /// getLabelAfterInsn - Return Label immediately following the instruction.
1495 const MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1496 return LabelsAfterInsn.lookup(MI);
1499 /// beginInstruction - Process beginning of an instruction.
1500 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1501 // Check if source location changes, but ignore DBG_VALUE locations.
1502 if (!MI->isDebugValue()) {
1503 DebugLoc DL = MI->getDebugLoc();
1504 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1505 unsigned Flags = DWARF2_FLAG_IS_STMT;
1507 if (DL == PrologEndLoc) {
1508 Flags |= DWARF2_FLAG_PROLOGUE_END;
1509 PrologEndLoc = DebugLoc();
1511 if (!DL.isUnknown()) {
1512 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1513 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1515 recordSourceLine(0, 0, 0, 0);
1519 // Insert labels where requested.
1520 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1521 LabelsBeforeInsn.find(MI);
1524 if (I == LabelsBeforeInsn.end())
1527 // Label already assigned.
1532 PrevLabel = MMI->getContext().CreateTempSymbol();
1533 Asm->OutStreamer.EmitLabel(PrevLabel);
1535 I->second = PrevLabel;
1538 /// endInstruction - Process end of an instruction.
1539 void DwarfDebug::endInstruction(const MachineInstr *MI) {
1540 // Don't create a new label after DBG_VALUE instructions.
1541 // They don't generate code.
1542 if (!MI->isDebugValue())
1545 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1546 LabelsAfterInsn.find(MI);
1549 if (I == LabelsAfterInsn.end())
1552 // Label already assigned.
1556 // We need a label after this instruction.
1558 PrevLabel = MMI->getContext().CreateTempSymbol();
1559 Asm->OutStreamer.EmitLabel(PrevLabel);
1561 I->second = PrevLabel;
1564 /// getOrCreateDbgScope - Create DbgScope for the scope.
1565 DbgScope *DwarfDebug::getOrCreateDbgScope(DebugLoc DL) {
1566 LLVMContext &Ctx = Asm->MF->getFunction()->getContext();
1567 MDNode *Scope = NULL;
1568 MDNode *InlinedAt = NULL;
1569 DL.getScopeAndInlinedAt(Scope, InlinedAt, Ctx);
1572 DbgScope *WScope = DbgScopeMap.lookup(Scope);
1575 WScope = new DbgScope(NULL, DIDescriptor(Scope), NULL);
1576 DbgScopeMap.insert(std::make_pair(Scope, WScope));
1577 if (DIDescriptor(Scope).isLexicalBlock()) {
1579 getOrCreateDbgScope(DebugLoc::getFromDILexicalBlock(Scope));
1580 WScope->setParent(Parent);
1581 Parent->addScope(WScope);
1582 } else if (DIDescriptor(Scope).isSubprogram()
1583 && DISubprogram(Scope).describes(Asm->MF->getFunction()))
1584 CurrentFnDbgScope = WScope;
1589 getOrCreateAbstractScope(Scope);
1590 DbgScope *WScope = DbgScopeMap.lookup(InlinedAt);
1594 WScope = new DbgScope(NULL, DIDescriptor(Scope), InlinedAt);
1595 DbgScopeMap.insert(std::make_pair(InlinedAt, WScope));
1596 InlinedDbgScopeMap[DebugLoc::getFromDILocation(InlinedAt)] = WScope;
1598 getOrCreateDbgScope(DebugLoc::getFromDILocation(InlinedAt));
1599 WScope->setParent(Parent);
1600 Parent->addScope(WScope);
1604 /// calculateDominanceGraph - Calculate dominance graph for DbgScope
1606 static void calculateDominanceGraph(DbgScope *Scope) {
1607 assert (Scope && "Unable to calculate scop edominance graph!");
1608 SmallVector<DbgScope *, 4> WorkStack;
1609 WorkStack.push_back(Scope);
1610 unsigned Counter = 0;
1611 while (!WorkStack.empty()) {
1612 DbgScope *WS = WorkStack.back();
1613 const SmallVector<DbgScope *, 4> &Children = WS->getScopes();
1614 bool visitedChildren = false;
1615 for (SmallVector<DbgScope *, 4>::const_iterator SI = Children.begin(),
1616 SE = Children.end(); SI != SE; ++SI) {
1617 DbgScope *ChildScope = *SI;
1618 if (!ChildScope->getDFSOut()) {
1619 WorkStack.push_back(ChildScope);
1620 visitedChildren = true;
1621 ChildScope->setDFSIn(++Counter);
1625 if (!visitedChildren) {
1626 WorkStack.pop_back();
1627 WS->setDFSOut(++Counter);
1632 /// printDbgScopeInfo - Print DbgScope info for each machine instruction.
1634 void printDbgScopeInfo(const MachineFunction *MF,
1635 DenseMap<const MachineInstr *, DbgScope *> &MI2ScopeMap)
1638 LLVMContext &Ctx = MF->getFunction()->getContext();
1639 unsigned PrevDFSIn = 0;
1640 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1642 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1644 const MachineInstr *MInsn = II;
1645 MDNode *Scope = NULL;
1646 MDNode *InlinedAt = NULL;
1648 // Check if instruction has valid location information.
1649 DebugLoc MIDL = MInsn->getDebugLoc();
1650 if (!MIDL.isUnknown()) {
1651 MIDL.getScopeAndInlinedAt(Scope, InlinedAt, Ctx);
1655 DenseMap<const MachineInstr *, DbgScope *>::iterator DI =
1656 MI2ScopeMap.find(MInsn);
1657 if (DI != MI2ScopeMap.end()) {
1658 DbgScope *S = DI->second;
1659 dbgs() << S->getDFSIn();
1660 PrevDFSIn = S->getDFSIn();
1662 dbgs() << PrevDFSIn;
1664 dbgs() << " [ x" << PrevDFSIn;
1672 /// extractScopeInformation - Scan machine instructions in this function
1673 /// and collect DbgScopes. Return true, if at least one scope was found.
1674 bool DwarfDebug::extractScopeInformation() {
1675 // If scope information was extracted using .dbg intrinsics then there is not
1676 // any need to extract these information by scanning each instruction.
1677 if (!DbgScopeMap.empty())
1680 // Scan each instruction and create scopes. First build working set of scopes.
1681 SmallVector<DbgRange, 4> MIRanges;
1682 DenseMap<const MachineInstr *, DbgScope *> MI2ScopeMap;
1684 const MachineInstr *RangeBeginMI = NULL;
1685 const MachineInstr *PrevMI = NULL;
1686 for (MachineFunction::const_iterator I = Asm->MF->begin(), E = Asm->MF->end();
1688 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1690 const MachineInstr *MInsn = II;
1692 // Check if instruction has valid location information.
1693 const DebugLoc MIDL = MInsn->getDebugLoc();
1694 if (MIDL.isUnknown()) {
1699 // If scope has not changed then skip this instruction.
1700 if (MIDL == PrevDL) {
1705 // Ignore DBG_VALUE. It does not contribute any instruction in output.
1706 if (MInsn->isDebugValue())
1710 // If we have alread seen a beginning of a instruction range and
1711 // current instruction scope does not match scope of first instruction
1712 // in this range then create a new instruction range.
1713 DEBUG(dbgs() << "Creating new instruction range :\n");
1714 DEBUG(dbgs() << "Begin Range at " << *RangeBeginMI);
1715 DEBUG(dbgs() << "End Range at " << *PrevMI);
1716 DEBUG(dbgs() << "Next Range starting at " << *MInsn);
1717 DEBUG(dbgs() << "------------------------\n");
1718 DbgRange R(RangeBeginMI, PrevMI);
1719 MI2ScopeMap[RangeBeginMI] = getOrCreateDbgScope(PrevDL);
1720 MIRanges.push_back(R);
1723 // This is a beginning of a new instruction range.
1724 RangeBeginMI = MInsn;
1726 // Reset previous markers.
1732 // Create last instruction range.
1733 if (RangeBeginMI && PrevMI && !PrevDL.isUnknown()) {
1734 DbgRange R(RangeBeginMI, PrevMI);
1735 MIRanges.push_back(R);
1736 MI2ScopeMap[RangeBeginMI] = getOrCreateDbgScope(PrevDL);
1739 if (!CurrentFnDbgScope)
1742 calculateDominanceGraph(CurrentFnDbgScope);
1744 printDbgScopeInfo(Asm->MF, MI2ScopeMap);
1746 // Find ranges of instructions covered by each DbgScope;
1747 DbgScope *PrevDbgScope = NULL;
1748 for (SmallVector<DbgRange, 4>::const_iterator RI = MIRanges.begin(),
1749 RE = MIRanges.end(); RI != RE; ++RI) {
1750 const DbgRange &R = *RI;
1751 DbgScope *S = MI2ScopeMap.lookup(R.first);
1752 assert (S && "Lost DbgScope for a machine instruction!");
1753 if (PrevDbgScope && !PrevDbgScope->dominates(S))
1754 PrevDbgScope->closeInsnRange(S);
1755 S->openInsnRange(R.first);
1756 S->extendInsnRange(R.second);
1761 PrevDbgScope->closeInsnRange();
1763 identifyScopeMarkers();
1765 return !DbgScopeMap.empty();
1768 /// identifyScopeMarkers() -
1769 /// Each DbgScope has first instruction and last instruction to mark beginning
1770 /// and end of a scope respectively. Create an inverse map that list scopes
1771 /// starts (and ends) with an instruction. One instruction may start (or end)
1772 /// multiple scopes. Ignore scopes that are not reachable.
1773 void DwarfDebug::identifyScopeMarkers() {
1774 SmallVector<DbgScope *, 4> WorkList;
1775 WorkList.push_back(CurrentFnDbgScope);
1776 while (!WorkList.empty()) {
1777 DbgScope *S = WorkList.pop_back_val();
1779 const SmallVector<DbgScope *, 4> &Children = S->getScopes();
1780 if (!Children.empty())
1781 for (SmallVector<DbgScope *, 4>::const_iterator SI = Children.begin(),
1782 SE = Children.end(); SI != SE; ++SI)
1783 WorkList.push_back(*SI);
1785 if (S->isAbstractScope())
1788 const SmallVector<DbgRange, 4> &Ranges = S->getRanges();
1791 for (SmallVector<DbgRange, 4>::const_iterator RI = Ranges.begin(),
1792 RE = Ranges.end(); RI != RE; ++RI) {
1793 assert(RI->first && "DbgRange does not have first instruction!");
1794 assert(RI->second && "DbgRange does not have second instruction!");
1795 requestLabelBeforeInsn(RI->first);
1796 requestLabelAfterInsn(RI->second);
1801 /// getScopeNode - Get MDNode for DebugLoc's scope.
1802 static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
1803 if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
1804 return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
1805 return DL.getScope(Ctx);
1808 /// getFnDebugLoc - Walk up the scope chain of given debug loc and find
1809 /// line number info for the function.
1810 static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
1811 const MDNode *Scope = getScopeNode(DL, Ctx);
1812 DISubprogram SP = getDISubprogram(Scope);
1814 return DebugLoc::get(SP.getLineNumber(), 0, SP);
1818 /// beginFunction - Gather pre-function debug information. Assumes being
1819 /// emitted immediately after the function entry point.
1820 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1821 if (!MMI->hasDebugInfo()) return;
1822 if (!extractScopeInformation()) return;
1824 FunctionBeginSym = Asm->GetTempSymbol("func_begin",
1825 Asm->getFunctionNumber());
1826 // Assumes in correct section after the entry point.
1827 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1829 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
1831 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1832 /// LiveUserVar - Map physreg numbers to the MDNode they contain.
1833 std::vector<const MDNode*> LiveUserVar(TRI->getNumRegs());
1835 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1837 bool AtBlockEntry = true;
1838 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1840 const MachineInstr *MI = II;
1842 if (MI->isDebugValue()) {
1843 assert (MI->getNumOperands() > 1 && "Invalid machine instruction!");
1845 // Keep track of user variables.
1847 MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1849 // Variable is in a register, we need to check for clobbers.
1850 if (isDbgValueInDefinedReg(MI))
1851 LiveUserVar[MI->getOperand(0).getReg()] = Var;
1853 // Check the history of this variable.
1854 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1855 if (History.empty()) {
1856 UserVariables.push_back(Var);
1857 // The first mention of a function argument gets the FunctionBeginSym
1858 // label, so arguments are visible when breaking at function entry.
1860 if (DV.Verify() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
1861 DISubprogram(getDISubprogram(DV.getContext()))
1862 .describes(MF->getFunction()))
1863 LabelsBeforeInsn[MI] = FunctionBeginSym;
1865 // We have seen this variable before. Try to coalesce DBG_VALUEs.
1866 const MachineInstr *Prev = History.back();
1867 if (Prev->isDebugValue()) {
1868 // Coalesce identical entries at the end of History.
1869 if (History.size() >= 2 &&
1870 Prev->isIdenticalTo(History[History.size() - 2])) {
1871 DEBUG(dbgs() << "Coalesce identical DBG_VALUE entries:\n"
1873 << "\t" << *History[History.size() - 2] << "\n");
1877 // Terminate old register assignments that don't reach MI;
1878 MachineFunction::const_iterator PrevMBB = Prev->getParent();
1879 if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
1880 isDbgValueInDefinedReg(Prev)) {
1881 // Previous register assignment needs to terminate at the end of
1883 MachineBasicBlock::const_iterator LastMI =
1884 PrevMBB->getLastNonDebugInstr();
1885 if (LastMI == PrevMBB->end()) {
1886 // Drop DBG_VALUE for empty range.
1887 DEBUG(dbgs() << "Drop DBG_VALUE for empty range:\n"
1888 << "\t" << *Prev << "\n");
1892 // Terminate after LastMI.
1893 History.push_back(LastMI);
1898 History.push_back(MI);
1900 // Not a DBG_VALUE instruction.
1902 AtBlockEntry = false;
1904 // First known non DBG_VALUE location marks beginning of function
1906 if (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown())
1907 PrologEndLoc = MI->getDebugLoc();
1909 // Check if the instruction clobbers any registers with debug vars.
1910 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
1911 MOE = MI->operands_end(); MOI != MOE; ++MOI) {
1912 if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
1914 for (const unsigned *AI = TRI->getOverlaps(MOI->getReg());
1915 unsigned Reg = *AI; ++AI) {
1916 const MDNode *Var = LiveUserVar[Reg];
1919 // Reg is now clobbered.
1920 LiveUserVar[Reg] = 0;
1922 // Was MD last defined by a DBG_VALUE referring to Reg?
1923 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
1924 if (HistI == DbgValues.end())
1926 SmallVectorImpl<const MachineInstr*> &History = HistI->second;
1927 if (History.empty())
1929 const MachineInstr *Prev = History.back();
1930 // Sanity-check: Register assignments are terminated at the end of
1932 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
1934 // Is the variable still in Reg?
1935 if (!isDbgValueInDefinedReg(Prev) ||
1936 Prev->getOperand(0).getReg() != Reg)
1938 // Var is clobbered. Make sure the next instruction gets a label.
1939 History.push_back(MI);
1946 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
1948 SmallVectorImpl<const MachineInstr*> &History = I->second;
1949 if (History.empty())
1952 // Make sure the final register assignments are terminated.
1953 const MachineInstr *Prev = History.back();
1954 if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
1955 const MachineBasicBlock *PrevMBB = Prev->getParent();
1956 MachineBasicBlock::const_iterator LastMI = PrevMBB->getLastNonDebugInstr();
1957 if (LastMI == PrevMBB->end())
1958 // Drop DBG_VALUE for empty range.
1961 // Terminate after LastMI.
1962 History.push_back(LastMI);
1965 // Request labels for the full history.
1966 for (unsigned i = 0, e = History.size(); i != e; ++i) {
1967 const MachineInstr *MI = History[i];
1968 if (MI->isDebugValue())
1969 requestLabelBeforeInsn(MI);
1971 requestLabelAfterInsn(MI);
1975 PrevInstLoc = DebugLoc();
1976 PrevLabel = FunctionBeginSym;
1978 // Record beginning of function.
1979 if (!PrologEndLoc.isUnknown()) {
1980 DebugLoc FnStartDL = getFnDebugLoc(PrologEndLoc,
1981 MF->getFunction()->getContext());
1982 recordSourceLine(FnStartDL.getLine(), FnStartDL.getCol(),
1983 FnStartDL.getScope(MF->getFunction()->getContext()),
1984 DWARF2_FLAG_IS_STMT);
1988 /// endFunction - Gather and emit post-function debug information.
1990 void DwarfDebug::endFunction(const MachineFunction *MF) {
1991 if (!MMI->hasDebugInfo() || DbgScopeMap.empty()) return;
1993 if (CurrentFnDbgScope) {
1995 // Define end label for subprogram.
1996 FunctionEndSym = Asm->GetTempSymbol("func_end",
1997 Asm->getFunctionNumber());
1998 // Assumes in correct section after the entry point.
1999 Asm->OutStreamer.EmitLabel(FunctionEndSym);
2001 SmallPtrSet<const MDNode *, 16> ProcessedVars;
2002 collectVariableInfo(MF, ProcessedVars);
2004 // Construct abstract scopes.
2005 for (SmallVector<DbgScope *, 4>::iterator AI = AbstractScopesList.begin(),
2006 AE = AbstractScopesList.end(); AI != AE; ++AI) {
2007 DISubprogram SP((*AI)->getScopeNode());
2009 // Collect info for variables that were optimized out.
2010 StringRef FName = SP.getLinkageName();
2012 FName = SP.getName();
2013 if (NamedMDNode *NMD =
2014 getFnSpecificMDNode(*(MF->getFunction()->getParent()), FName)) {
2015 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2016 DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
2017 if (!DV || !ProcessedVars.insert(DV))
2019 DbgScope *Scope = AbstractScopes.lookup(DV.getContext());
2021 Scope->addVariable(new DbgVariable(DV));
2025 if (ProcessedSPNodes.count((*AI)->getScopeNode()) == 0)
2026 constructScopeDIE(*AI);
2029 DIE *CurFnDIE = constructScopeDIE(CurrentFnDbgScope);
2031 if (!DisableFramePointerElim(*MF))
2032 getCompileUnit(CurrentFnDbgScope->getScopeNode())->addUInt(CurFnDIE,
2033 dwarf::DW_AT_APPLE_omit_frame_ptr,
2034 dwarf::DW_FORM_flag, 1);
2037 DebugFrames.push_back(FunctionDebugFrameInfo(Asm->getFunctionNumber(),
2038 MMI->getFrameMoves()));
2042 CurrentFnDbgScope = NULL;
2043 DeleteContainerPointers(CurrentFnArguments);
2044 DbgVariableToFrameIndexMap.clear();
2045 VarToAbstractVarMap.clear();
2046 DbgVariableToDbgInstMap.clear();
2047 InlinedDbgScopeMap.clear();
2048 DeleteContainerSeconds(DbgScopeMap);
2049 UserVariables.clear();
2051 DeleteContainerSeconds(AbstractScopes);
2052 AbstractScopesList.clear();
2053 AbstractVariables.clear();
2054 LabelsBeforeInsn.clear();
2055 LabelsAfterInsn.clear();
2059 /// recordVariableFrameIndex - Record a variable's index.
2060 void DwarfDebug::recordVariableFrameIndex(const DbgVariable *V, int Index) {
2061 assert (V && "Invalid DbgVariable!");
2062 DbgVariableToFrameIndexMap[V] = Index;
2065 /// findVariableFrameIndex - Return true if frame index for the variable
2066 /// is found. Update FI to hold value of the index.
2067 bool DwarfDebug::findVariableFrameIndex(const DbgVariable *V, int *FI) {
2068 assert (V && "Invalid DbgVariable!");
2069 DenseMap<const DbgVariable *, int>::iterator I =
2070 DbgVariableToFrameIndexMap.find(V);
2071 if (I == DbgVariableToFrameIndexMap.end())
2077 /// findDbgScope - Find DbgScope for the debug loc.
2078 DbgScope *DwarfDebug::findDbgScope(DebugLoc DL) {
2082 DbgScope *Scope = NULL;
2083 LLVMContext &Ctx = Asm->MF->getFunction()->getContext();
2084 if (MDNode *IA = DL.getInlinedAt(Ctx))
2085 Scope = InlinedDbgScopeMap.lookup(DebugLoc::getFromDILocation(IA));
2087 Scope = DbgScopeMap.lookup(DL.getScope(Ctx));
2092 /// recordSourceLine - Register a source line with debug info. Returns the
2093 /// unique label that was emitted and which provides correspondence to
2094 /// the source line list.
2095 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
2101 DIDescriptor Scope(S);
2103 if (Scope.isCompileUnit()) {
2104 DICompileUnit CU(S);
2105 Fn = CU.getFilename();
2106 Dir = CU.getDirectory();
2107 } else if (Scope.isFile()) {
2109 Fn = F.getFilename();
2110 Dir = F.getDirectory();
2111 } else if (Scope.isSubprogram()) {
2113 Fn = SP.getFilename();
2114 Dir = SP.getDirectory();
2115 } else if (Scope.isLexicalBlock()) {
2116 DILexicalBlock DB(S);
2117 Fn = DB.getFilename();
2118 Dir = DB.getDirectory();
2120 assert(0 && "Unexpected scope info");
2122 Src = GetOrCreateSourceID(Fn, Dir);
2124 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags,
2128 //===----------------------------------------------------------------------===//
2130 //===----------------------------------------------------------------------===//
2132 /// computeSizeAndOffset - Compute the size and offset of a DIE.
2135 DwarfDebug::computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last) {
2136 // Get the children.
2137 const std::vector<DIE *> &Children = Die->getChildren();
2139 // If not last sibling and has children then add sibling offset attribute.
2140 if (!Last && !Children.empty())
2141 Die->addSiblingOffset(DIEValueAllocator);
2143 // Record the abbreviation.
2144 assignAbbrevNumber(Die->getAbbrev());
2146 // Get the abbreviation for this DIE.
2147 unsigned AbbrevNumber = Die->getAbbrevNumber();
2148 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2151 Die->setOffset(Offset);
2153 // Start the size with the size of abbreviation code.
2154 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
2156 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2157 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2159 // Size the DIE attribute values.
2160 for (unsigned i = 0, N = Values.size(); i < N; ++i)
2161 // Size attribute value.
2162 Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
2164 // Size the DIE children if any.
2165 if (!Children.empty()) {
2166 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
2167 "Children flag not set");
2169 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2170 Offset = computeSizeAndOffset(Children[j], Offset, (j + 1) == M);
2172 // End of children marker.
2173 Offset += sizeof(int8_t);
2176 Die->setSize(Offset - Die->getOffset());
2180 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
2182 void DwarfDebug::computeSizeAndOffsets() {
2183 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2184 E = CUMap.end(); I != E; ++I) {
2185 // Compute size of compile unit header.
2187 sizeof(int32_t) + // Length of Compilation Unit Info
2188 sizeof(int16_t) + // DWARF version number
2189 sizeof(int32_t) + // Offset Into Abbrev. Section
2190 sizeof(int8_t); // Pointer Size (in bytes)
2191 computeSizeAndOffset(I->second->getCUDie(), Offset, true);
2195 /// EmitSectionSym - Switch to the specified MCSection and emit an assembler
2196 /// temporary label to it if SymbolStem is specified.
2197 static MCSymbol *EmitSectionSym(AsmPrinter *Asm, const MCSection *Section,
2198 const char *SymbolStem = 0) {
2199 Asm->OutStreamer.SwitchSection(Section);
2200 if (!SymbolStem) return 0;
2202 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
2203 Asm->OutStreamer.EmitLabel(TmpSym);
2207 /// EmitSectionLabels - Emit initial Dwarf sections with a label at
2208 /// the start of each one.
2209 void DwarfDebug::EmitSectionLabels() {
2210 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
2212 // Dwarf sections base addresses.
2213 DwarfInfoSectionSym =
2214 EmitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
2215 DwarfAbbrevSectionSym =
2216 EmitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
2217 EmitSectionSym(Asm, TLOF.getDwarfARangesSection());
2219 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
2220 EmitSectionSym(Asm, MacroInfo);
2222 EmitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
2223 EmitSectionSym(Asm, TLOF.getDwarfLocSection());
2224 EmitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
2225 EmitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
2226 DwarfStrSectionSym =
2227 EmitSectionSym(Asm, TLOF.getDwarfStrSection(), "section_str");
2228 DwarfDebugRangeSectionSym = EmitSectionSym(Asm, TLOF.getDwarfRangesSection(),
2231 DwarfDebugLocSectionSym = EmitSectionSym(Asm, TLOF.getDwarfLocSection(),
2232 "section_debug_loc");
2234 TextSectionSym = EmitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
2235 EmitSectionSym(Asm, TLOF.getDataSection());
2238 /// emitDIE - Recusively Emits a debug information entry.
2240 void DwarfDebug::emitDIE(DIE *Die) {
2241 // Get the abbreviation for this DIE.
2242 unsigned AbbrevNumber = Die->getAbbrevNumber();
2243 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2245 // Emit the code (index) for the abbreviation.
2246 if (Asm->isVerbose())
2247 Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
2248 Twine::utohexstr(Die->getOffset()) + ":0x" +
2249 Twine::utohexstr(Die->getSize()) + " " +
2250 dwarf::TagString(Abbrev->getTag()));
2251 Asm->EmitULEB128(AbbrevNumber);
2253 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2254 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2256 // Emit the DIE attribute values.
2257 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2258 unsigned Attr = AbbrevData[i].getAttribute();
2259 unsigned Form = AbbrevData[i].getForm();
2260 assert(Form && "Too many attributes for DIE (check abbreviation)");
2262 if (Asm->isVerbose())
2263 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
2266 case dwarf::DW_AT_sibling:
2267 Asm->EmitInt32(Die->getSiblingOffset());
2269 case dwarf::DW_AT_abstract_origin: {
2270 DIEEntry *E = cast<DIEEntry>(Values[i]);
2271 DIE *Origin = E->getEntry();
2272 unsigned Addr = Origin->getOffset();
2273 Asm->EmitInt32(Addr);
2276 case dwarf::DW_AT_ranges: {
2277 // DW_AT_range Value encodes offset in debug_range section.
2278 DIEInteger *V = cast<DIEInteger>(Values[i]);
2280 if (Asm->MAI->doesDwarfUsesLabelOffsetForRanges()) {
2281 Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym,
2285 Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
2287 DwarfDebugRangeSectionSym,
2292 case dwarf::DW_AT_location: {
2293 if (UseDotDebugLocEntry.count(Die) != 0) {
2294 DIELabel *L = cast<DIELabel>(Values[i]);
2295 Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
2297 Values[i]->EmitValue(Asm, Form);
2300 case dwarf::DW_AT_accessibility: {
2301 if (Asm->isVerbose()) {
2302 DIEInteger *V = cast<DIEInteger>(Values[i]);
2303 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
2305 Values[i]->EmitValue(Asm, Form);
2309 // Emit an attribute using the defined form.
2310 Values[i]->EmitValue(Asm, Form);
2315 // Emit the DIE children if any.
2316 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
2317 const std::vector<DIE *> &Children = Die->getChildren();
2319 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2320 emitDIE(Children[j]);
2322 if (Asm->isVerbose())
2323 Asm->OutStreamer.AddComment("End Of Children Mark");
2328 /// emitDebugInfo - Emit the debug info section.
2330 void DwarfDebug::emitDebugInfo() {
2331 // Start debug info section.
2332 Asm->OutStreamer.SwitchSection(
2333 Asm->getObjFileLowering().getDwarfInfoSection());
2334 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2335 E = CUMap.end(); I != E; ++I) {
2336 CompileUnit *TheCU = I->second;
2337 DIE *Die = TheCU->getCUDie();
2339 // Emit the compile units header.
2340 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_begin",
2343 // Emit size of content not including length itself
2344 unsigned ContentSize = Die->getSize() +
2345 sizeof(int16_t) + // DWARF version number
2346 sizeof(int32_t) + // Offset Into Abbrev. Section
2347 sizeof(int8_t); // Pointer Size (in bytes)
2349 Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
2350 Asm->EmitInt32(ContentSize);
2351 Asm->OutStreamer.AddComment("DWARF version number");
2352 Asm->EmitInt16(dwarf::DWARF_VERSION);
2353 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
2354 Asm->EmitSectionOffset(Asm->GetTempSymbol("abbrev_begin"),
2355 DwarfAbbrevSectionSym);
2356 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2357 Asm->EmitInt8(Asm->getTargetData().getPointerSize());
2360 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_end", TheCU->getID()));
2364 /// emitAbbreviations - Emit the abbreviation section.
2366 void DwarfDebug::emitAbbreviations() const {
2367 // Check to see if it is worth the effort.
2368 if (!Abbreviations.empty()) {
2369 // Start the debug abbrev section.
2370 Asm->OutStreamer.SwitchSection(
2371 Asm->getObjFileLowering().getDwarfAbbrevSection());
2373 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_begin"));
2375 // For each abbrevation.
2376 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
2377 // Get abbreviation data
2378 const DIEAbbrev *Abbrev = Abbreviations[i];
2380 // Emit the abbrevations code (base 1 index.)
2381 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
2383 // Emit the abbreviations data.
2387 // Mark end of abbreviations.
2388 Asm->EmitULEB128(0, "EOM(3)");
2390 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_end"));
2394 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
2395 /// the line matrix.
2397 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
2398 // Define last address of section.
2399 Asm->OutStreamer.AddComment("Extended Op");
2402 Asm->OutStreamer.AddComment("Op size");
2403 Asm->EmitInt8(Asm->getTargetData().getPointerSize() + 1);
2404 Asm->OutStreamer.AddComment("DW_LNE_set_address");
2405 Asm->EmitInt8(dwarf::DW_LNE_set_address);
2407 Asm->OutStreamer.AddComment("Section end label");
2409 Asm->OutStreamer.EmitSymbolValue(Asm->GetTempSymbol("section_end",SectionEnd),
2410 Asm->getTargetData().getPointerSize(),
2413 // Mark end of matrix.
2414 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
2420 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
2422 void DwarfDebug::emitDebugPubNames() {
2423 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2424 E = CUMap.end(); I != E; ++I) {
2425 CompileUnit *TheCU = I->second;
2426 // Start the dwarf pubnames section.
2427 Asm->OutStreamer.SwitchSection(
2428 Asm->getObjFileLowering().getDwarfPubNamesSection());
2430 Asm->OutStreamer.AddComment("Length of Public Names Info");
2431 Asm->EmitLabelDifference(
2432 Asm->GetTempSymbol("pubnames_end", TheCU->getID()),
2433 Asm->GetTempSymbol("pubnames_begin", TheCU->getID()), 4);
2435 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin",
2438 Asm->OutStreamer.AddComment("DWARF Version");
2439 Asm->EmitInt16(dwarf::DWARF_VERSION);
2441 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2442 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
2443 DwarfInfoSectionSym);
2445 Asm->OutStreamer.AddComment("Compilation Unit Length");
2446 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
2447 Asm->GetTempSymbol("info_begin", TheCU->getID()),
2450 const StringMap<DIE*> &Globals = TheCU->getGlobals();
2451 for (StringMap<DIE*>::const_iterator
2452 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2453 const char *Name = GI->getKeyData();
2454 DIE *Entity = GI->second;
2456 Asm->OutStreamer.AddComment("DIE offset");
2457 Asm->EmitInt32(Entity->getOffset());
2459 if (Asm->isVerbose())
2460 Asm->OutStreamer.AddComment("External Name");
2461 Asm->OutStreamer.EmitBytes(StringRef(Name, strlen(Name)+1), 0);
2464 Asm->OutStreamer.AddComment("End Mark");
2466 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_end",
2471 void DwarfDebug::emitDebugPubTypes() {
2472 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2473 E = CUMap.end(); I != E; ++I) {
2474 CompileUnit *TheCU = I->second;
2475 // Start the dwarf pubnames section.
2476 Asm->OutStreamer.SwitchSection(
2477 Asm->getObjFileLowering().getDwarfPubTypesSection());
2478 Asm->OutStreamer.AddComment("Length of Public Types Info");
2479 Asm->EmitLabelDifference(
2480 Asm->GetTempSymbol("pubtypes_end", TheCU->getID()),
2481 Asm->GetTempSymbol("pubtypes_begin", TheCU->getID()), 4);
2483 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_begin",
2486 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DWARF Version");
2487 Asm->EmitInt16(dwarf::DWARF_VERSION);
2489 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2490 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
2491 DwarfInfoSectionSym);
2493 Asm->OutStreamer.AddComment("Compilation Unit Length");
2494 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
2495 Asm->GetTempSymbol("info_begin", TheCU->getID()),
2498 const StringMap<DIE*> &Globals = TheCU->getGlobalTypes();
2499 for (StringMap<DIE*>::const_iterator
2500 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2501 const char *Name = GI->getKeyData();
2502 DIE * Entity = GI->second;
2504 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2505 Asm->EmitInt32(Entity->getOffset());
2507 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("External Name");
2508 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1), 0);
2511 Asm->OutStreamer.AddComment("End Mark");
2513 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_end",
2518 /// emitDebugStr - Emit visible names into a debug str section.
2520 void DwarfDebug::emitDebugStr() {
2521 // Check to see if it is worth the effort.
2522 if (StringPool.empty()) return;
2524 // Start the dwarf str section.
2525 Asm->OutStreamer.SwitchSection(
2526 Asm->getObjFileLowering().getDwarfStrSection());
2528 // Get all of the string pool entries and put them in an array by their ID so
2529 // we can sort them.
2530 SmallVector<std::pair<unsigned,
2531 StringMapEntry<std::pair<MCSymbol*, unsigned> >*>, 64> Entries;
2533 for (StringMap<std::pair<MCSymbol*, unsigned> >::iterator
2534 I = StringPool.begin(), E = StringPool.end(); I != E; ++I)
2535 Entries.push_back(std::make_pair(I->second.second, &*I));
2537 array_pod_sort(Entries.begin(), Entries.end());
2539 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2540 // Emit a label for reference from debug information entries.
2541 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
2543 // Emit the string itself.
2544 Asm->OutStreamer.EmitBytes(Entries[i].second->getKey(), 0/*addrspace*/);
2548 /// emitDebugLoc - Emit visible names into a debug loc section.
2550 void DwarfDebug::emitDebugLoc() {
2551 if (DotDebugLocEntries.empty())
2554 for (SmallVector<DotDebugLocEntry, 4>::iterator
2555 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2557 DotDebugLocEntry &Entry = *I;
2558 if (I + 1 != DotDebugLocEntries.end())
2562 // Start the dwarf loc section.
2563 Asm->OutStreamer.SwitchSection(
2564 Asm->getObjFileLowering().getDwarfLocSection());
2565 unsigned char Size = Asm->getTargetData().getPointerSize();
2566 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
2568 for (SmallVector<DotDebugLocEntry, 4>::iterator
2569 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2570 I != E; ++I, ++index) {
2571 DotDebugLocEntry &Entry = *I;
2572 if (Entry.isMerged()) continue;
2573 if (Entry.isEmpty()) {
2574 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2575 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2576 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
2578 Asm->OutStreamer.EmitSymbolValue(Entry.Begin, Size, 0);
2579 Asm->OutStreamer.EmitSymbolValue(Entry.End, Size, 0);
2580 DIVariable DV(Entry.Variable);
2581 Asm->OutStreamer.AddComment("Loc expr size");
2582 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
2583 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
2584 Asm->EmitLabelDifference(end, begin, 2);
2585 Asm->OutStreamer.EmitLabel(begin);
2586 if (Entry.isInt()) {
2587 DIBasicType BTy(DV.getType());
2589 (BTy.getEncoding() == dwarf::DW_ATE_signed
2590 || BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
2591 Asm->OutStreamer.AddComment("DW_OP_consts");
2592 Asm->EmitInt8(dwarf::DW_OP_consts);
2593 Asm->EmitSLEB128(Entry.getInt());
2595 Asm->OutStreamer.AddComment("DW_OP_constu");
2596 Asm->EmitInt8(dwarf::DW_OP_constu);
2597 Asm->EmitULEB128(Entry.getInt());
2599 } else if (Entry.isLocation()) {
2600 if (!DV.hasComplexAddress())
2602 Asm->EmitDwarfRegOp(Entry.Loc);
2604 // Complex address entry.
2605 unsigned N = DV.getNumAddrElements();
2607 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
2608 if (Entry.Loc.getOffset()) {
2610 Asm->EmitDwarfRegOp(Entry.Loc);
2611 Asm->OutStreamer.AddComment("DW_OP_deref");
2612 Asm->EmitInt8(dwarf::DW_OP_deref);
2613 Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
2614 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2615 Asm->EmitSLEB128(DV.getAddrElement(1));
2617 // If first address element is OpPlus then emit
2618 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
2619 MachineLocation Loc(Entry.Loc.getReg(), DV.getAddrElement(1));
2620 Asm->EmitDwarfRegOp(Loc);
2624 Asm->EmitDwarfRegOp(Entry.Loc);
2627 // Emit remaining complex address elements.
2628 for (; i < N; ++i) {
2629 uint64_t Element = DV.getAddrElement(i);
2630 if (Element == DIBuilder::OpPlus) {
2631 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2632 Asm->EmitULEB128(DV.getAddrElement(++i));
2633 } else if (Element == DIBuilder::OpDeref)
2634 Asm->EmitInt8(dwarf::DW_OP_deref);
2635 else llvm_unreachable("unknown Opcode found in complex address");
2639 // else ... ignore constant fp. There is not any good way to
2640 // to represent them here in dwarf.
2641 Asm->OutStreamer.EmitLabel(end);
2646 /// EmitDebugARanges - Emit visible names into a debug aranges section.
2648 void DwarfDebug::EmitDebugARanges() {
2649 // Start the dwarf aranges section.
2650 Asm->OutStreamer.SwitchSection(
2651 Asm->getObjFileLowering().getDwarfARangesSection());
2654 /// emitDebugRanges - Emit visible names into a debug ranges section.
2656 void DwarfDebug::emitDebugRanges() {
2657 // Start the dwarf ranges section.
2658 Asm->OutStreamer.SwitchSection(
2659 Asm->getObjFileLowering().getDwarfRangesSection());
2660 unsigned char Size = Asm->getTargetData().getPointerSize();
2661 for (SmallVector<const MCSymbol *, 8>::iterator
2662 I = DebugRangeSymbols.begin(), E = DebugRangeSymbols.end();
2665 Asm->OutStreamer.EmitSymbolValue(const_cast<MCSymbol*>(*I), Size, 0);
2667 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2671 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
2673 void DwarfDebug::emitDebugMacInfo() {
2674 if (const MCSection *LineInfo =
2675 Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
2676 // Start the dwarf macinfo section.
2677 Asm->OutStreamer.SwitchSection(LineInfo);
2681 /// emitDebugInlineInfo - Emit inline info using following format.
2683 /// 1. length of section
2684 /// 2. Dwarf version number
2685 /// 3. address size.
2687 /// Entries (one "entry" for each function that was inlined):
2689 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
2690 /// otherwise offset into __debug_str for regular function name.
2691 /// 2. offset into __debug_str section for regular function name.
2692 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
2693 /// instances for the function.
2695 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
2696 /// inlined instance; the die_offset points to the inlined_subroutine die in the
2697 /// __debug_info section, and the low_pc is the starting address for the
2698 /// inlining instance.
2699 void DwarfDebug::emitDebugInlineInfo() {
2700 if (!Asm->MAI->doesDwarfUsesInlineInfoSection())
2706 Asm->OutStreamer.SwitchSection(
2707 Asm->getObjFileLowering().getDwarfDebugInlineSection());
2709 Asm->OutStreamer.AddComment("Length of Debug Inlined Information Entry");
2710 Asm->EmitLabelDifference(Asm->GetTempSymbol("debug_inlined_end", 1),
2711 Asm->GetTempSymbol("debug_inlined_begin", 1), 4);
2713 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_begin", 1));
2715 Asm->OutStreamer.AddComment("Dwarf Version");
2716 Asm->EmitInt16(dwarf::DWARF_VERSION);
2717 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2718 Asm->EmitInt8(Asm->getTargetData().getPointerSize());
2720 for (SmallVector<const MDNode *, 4>::iterator I = InlinedSPNodes.begin(),
2721 E = InlinedSPNodes.end(); I != E; ++I) {
2723 const MDNode *Node = *I;
2724 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator II
2725 = InlineInfo.find(Node);
2726 SmallVector<InlineInfoLabels, 4> &Labels = II->second;
2727 DISubprogram SP(Node);
2728 StringRef LName = SP.getLinkageName();
2729 StringRef Name = SP.getName();
2731 Asm->OutStreamer.AddComment("MIPS linkage name");
2732 if (LName.empty()) {
2733 Asm->OutStreamer.EmitBytes(Name, 0);
2734 Asm->OutStreamer.EmitIntValue(0, 1, 0); // nul terminator.
2736 Asm->EmitSectionOffset(getStringPoolEntry(getRealLinkageName(LName)),
2737 DwarfStrSectionSym);
2739 Asm->OutStreamer.AddComment("Function name");
2740 Asm->EmitSectionOffset(getStringPoolEntry(Name), DwarfStrSectionSym);
2741 Asm->EmitULEB128(Labels.size(), "Inline count");
2743 for (SmallVector<InlineInfoLabels, 4>::iterator LI = Labels.begin(),
2744 LE = Labels.end(); LI != LE; ++LI) {
2745 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2746 Asm->EmitInt32(LI->second->getOffset());
2748 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("low_pc");
2749 Asm->OutStreamer.EmitSymbolValue(LI->first,
2750 Asm->getTargetData().getPointerSize(),0);
2754 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_end", 1));