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 const MDNode *N = Desc;
235 err << "Abstract Scope\n";
239 err << "Children ...\n";
240 for (unsigned i = 0, e = Scopes.size(); i != e; ++i)
241 if (Scopes[i] != this)
248 DbgScope::~DbgScope() {
249 for (unsigned j = 0, M = Variables.size(); j < M; ++j)
253 DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
254 : Asm(A), MMI(Asm->MMI), FirstCU(0),
255 AbbreviationsSet(InitAbbreviationsSetSize),
256 CurrentFnDbgScope(0), PrevLabel(NULL) {
257 NextStringPoolNumber = 0;
259 DwarfInfoSectionSym = DwarfAbbrevSectionSym = 0;
260 DwarfStrSectionSym = TextSectionSym = 0;
261 DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = 0;
262 FunctionBeginSym = FunctionEndSym = 0;
264 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
268 DwarfDebug::~DwarfDebug() {
271 MCSymbol *DwarfDebug::getStringPoolEntry(StringRef Str) {
272 std::pair<MCSymbol*, unsigned> &Entry = StringPool[Str];
273 if (Entry.first) return Entry.first;
275 Entry.second = NextStringPoolNumber++;
276 return Entry.first = Asm->GetTempSymbol("string", Entry.second);
280 /// assignAbbrevNumber - Define a unique number for the abbreviation.
282 void DwarfDebug::assignAbbrevNumber(DIEAbbrev &Abbrev) {
283 // Profile the node so that we can make it unique.
287 // Check the set for priors.
288 DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
290 // If it's newly added.
291 if (InSet == &Abbrev) {
292 // Add to abbreviation list.
293 Abbreviations.push_back(&Abbrev);
295 // Assign the vector position + 1 as its number.
296 Abbrev.setNumber(Abbreviations.size());
298 // Assign existing abbreviation number.
299 Abbrev.setNumber(InSet->getNumber());
303 /// getRealLinkageName - If special LLVM prefix that is used to inform the asm
304 /// printer to not emit usual symbol prefix before the symbol name is used then
305 /// return linkage name after skipping this special LLVM prefix.
306 static StringRef getRealLinkageName(StringRef LinkageName) {
308 if (LinkageName.startswith(StringRef(&One, 1)))
309 return LinkageName.substr(1);
313 /// createSubprogramDIE - Create new DIE using SP.
314 DIE *DwarfDebug::createSubprogramDIE(DISubprogram SP) {
315 CompileUnit *SPCU = getCompileUnit(SP);
316 DIE *SPDie = SPCU->getDIE(SP);
320 SPDie = new DIE(dwarf::DW_TAG_subprogram);
322 // DW_TAG_inlined_subroutine may refer to this DIE.
323 SPCU->insertDIE(SP, SPDie);
325 // Add to context owner.
326 SPCU->addToContextOwner(SPDie, SP.getContext());
328 // Add function template parameters.
329 SPCU->addTemplateParams(*SPDie, SP.getTemplateParams());
331 StringRef LinkageName = SP.getLinkageName();
332 if (!LinkageName.empty())
333 SPCU->addString(SPDie, dwarf::DW_AT_MIPS_linkage_name, dwarf::DW_FORM_string,
334 getRealLinkageName(LinkageName));
336 // If this DIE is going to refer declaration info using AT_specification
337 // then there is no need to add other attributes.
338 if (SP.getFunctionDeclaration().isSubprogram())
341 // Constructors and operators for anonymous aggregates do not have names.
342 if (!SP.getName().empty())
343 SPCU->addString(SPDie, dwarf::DW_AT_name, dwarf::DW_FORM_string,
346 SPCU->addSourceLine(SPDie, SP);
348 if (SP.isPrototyped())
349 SPCU->addUInt(SPDie, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
352 DICompositeType SPTy = SP.getType();
353 DIArray Args = SPTy.getTypeArray();
354 unsigned SPTag = SPTy.getTag();
356 if (Args.getNumElements() == 0 || SPTag != dwarf::DW_TAG_subroutine_type)
357 SPCU->addType(SPDie, SPTy);
359 SPCU->addType(SPDie, DIType(Args.getElement(0)));
361 unsigned VK = SP.getVirtuality();
363 SPCU->addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_flag, VK);
364 DIEBlock *Block = SPCU->getDIEBlock();
365 SPCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
366 SPCU->addUInt(Block, 0, dwarf::DW_FORM_udata, SP.getVirtualIndex());
367 SPCU->addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, 0, Block);
368 ContainingTypeMap.insert(std::make_pair(SPDie,
369 SP.getContainingType()));
372 if (!SP.isDefinition()) {
373 SPCU->addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
375 // Add arguments. Do not add arguments for subprogram definition. They will
376 // be handled while processing variables.
377 DICompositeType SPTy = SP.getType();
378 DIArray Args = SPTy.getTypeArray();
379 unsigned SPTag = SPTy.getTag();
381 if (SPTag == dwarf::DW_TAG_subroutine_type)
382 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
383 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
384 DIType ATy = DIType(DIType(Args.getElement(i)));
385 SPCU->addType(Arg, ATy);
386 if (ATy.isArtificial())
387 SPCU->addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
388 SPDie->addChild(Arg);
392 if (SP.isArtificial())
393 SPCU->addUInt(SPDie, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
395 if (!SP.isLocalToUnit())
396 SPCU->addUInt(SPDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
398 if (SP.isOptimized())
399 SPCU->addUInt(SPDie, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
401 if (unsigned isa = Asm->getISAEncoding()) {
402 SPCU->addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
408 DbgScope *DwarfDebug::getOrCreateAbstractScope(const MDNode *N) {
409 assert(N && "Invalid Scope encoding!");
411 DbgScope *AScope = AbstractScopes.lookup(N);
415 DbgScope *Parent = NULL;
417 DIDescriptor Scope(N);
418 if (Scope.isLexicalBlock()) {
419 DILexicalBlock DB(N);
420 DIDescriptor ParentDesc = DB.getContext();
421 Parent = getOrCreateAbstractScope(ParentDesc);
424 AScope = new DbgScope(Parent, DIDescriptor(N), NULL);
427 Parent->addScope(AScope);
428 AScope->setAbstractScope();
429 AbstractScopes[N] = AScope;
430 if (DIDescriptor(N).isSubprogram())
431 AbstractScopesList.push_back(AScope);
435 /// isSubprogramContext - Return true if Context is either a subprogram
436 /// or another context nested inside a subprogram.
437 static bool isSubprogramContext(const MDNode *Context) {
440 DIDescriptor D(Context);
441 if (D.isSubprogram())
444 return isSubprogramContext(DIType(Context).getContext());
448 /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
449 /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
450 /// If there are global variables in this scope then create and insert
451 /// DIEs for these variables.
452 DIE *DwarfDebug::updateSubprogramScopeDIE(const MDNode *SPNode) {
453 CompileUnit *SPCU = getCompileUnit(SPNode);
454 DIE *SPDie = SPCU->getDIE(SPNode);
456 assert(SPDie && "Unable to find subprogram DIE!");
457 DISubprogram SP(SPNode);
459 DISubprogram SPDecl = SP.getFunctionDeclaration();
460 if (SPDecl.isSubprogram())
461 // Refer function declaration directly.
462 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification, dwarf::DW_FORM_ref4,
463 createSubprogramDIE(SPDecl));
465 // There is not any need to generate specification DIE for a function
466 // defined at compile unit level. If a function is defined inside another
467 // function then gdb prefers the definition at top level and but does not
468 // expect specification DIE in parent function. So avoid creating
469 // specification DIE for a function defined inside a function.
470 if (SP.isDefinition() && !SP.getContext().isCompileUnit() &&
471 !SP.getContext().isFile() &&
472 !isSubprogramContext(SP.getContext())) {
473 SPCU-> addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
476 DICompositeType SPTy = SP.getType();
477 DIArray Args = SPTy.getTypeArray();
478 unsigned SPTag = SPTy.getTag();
479 if (SPTag == dwarf::DW_TAG_subroutine_type)
480 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
481 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
482 DIType ATy = DIType(DIType(Args.getElement(i)));
483 SPCU->addType(Arg, ATy);
484 if (ATy.isArtificial())
485 SPCU->addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
486 SPDie->addChild(Arg);
488 DIE *SPDeclDie = SPDie;
489 SPDie = new DIE(dwarf::DW_TAG_subprogram);
490 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification, dwarf::DW_FORM_ref4,
495 // Pick up abstract subprogram DIE.
496 if (DIE *AbsSPDIE = AbstractSPDies.lookup(SPNode)) {
497 SPDie = new DIE(dwarf::DW_TAG_subprogram);
498 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_abstract_origin,
499 dwarf::DW_FORM_ref4, AbsSPDIE);
503 SPCU->addLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
504 Asm->GetTempSymbol("func_begin", Asm->getFunctionNumber()));
505 SPCU->addLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
506 Asm->GetTempSymbol("func_end", Asm->getFunctionNumber()));
507 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
508 MachineLocation Location(RI->getFrameRegister(*Asm->MF));
509 SPCU->addAddress(SPDie, dwarf::DW_AT_frame_base, Location);
514 /// constructLexicalScope - Construct new DW_TAG_lexical_block
515 /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
516 DIE *DwarfDebug::constructLexicalScopeDIE(DbgScope *Scope) {
518 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_lexical_block);
519 if (Scope->isAbstractScope())
522 const SmallVector<DbgRange, 4> &Ranges = Scope->getRanges();
526 CompileUnit *TheCU = getCompileUnit(Scope->getScopeNode());
527 SmallVector<DbgRange, 4>::const_iterator RI = Ranges.begin();
528 if (Ranges.size() > 1) {
529 // .debug_range section has not been laid out yet. Emit offset in
530 // .debug_range as a uint, size 4, for now. emitDIE will handle
531 // DW_AT_ranges appropriately.
532 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_ranges, dwarf::DW_FORM_data4,
533 DebugRangeSymbols.size() * Asm->getTargetData().getPointerSize());
534 for (SmallVector<DbgRange, 4>::const_iterator RI = Ranges.begin(),
535 RE = Ranges.end(); RI != RE; ++RI) {
536 DebugRangeSymbols.push_back(getLabelBeforeInsn(RI->first));
537 DebugRangeSymbols.push_back(getLabelAfterInsn(RI->second));
539 DebugRangeSymbols.push_back(NULL);
540 DebugRangeSymbols.push_back(NULL);
544 const MCSymbol *Start = getLabelBeforeInsn(RI->first);
545 const MCSymbol *End = getLabelAfterInsn(RI->second);
547 if (End == 0) return 0;
549 assert(Start->isDefined() && "Invalid starting label for an inlined scope!");
550 assert(End->isDefined() && "Invalid end label for an inlined scope!");
552 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, Start);
553 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr, End);
558 /// constructInlinedScopeDIE - This scope represents inlined body of
559 /// a function. Construct DIE to represent this concrete inlined copy
561 DIE *DwarfDebug::constructInlinedScopeDIE(DbgScope *Scope) {
563 const SmallVector<DbgRange, 4> &Ranges = Scope->getRanges();
564 assert (Ranges.empty() == false
565 && "DbgScope does not have instruction markers!");
567 // FIXME : .debug_inlined section specification does not clearly state how
568 // to emit inlined scope that is split into multiple instruction ranges.
569 // For now, use first instruction range and emit low_pc/high_pc pair and
570 // corresponding .debug_inlined section entry for this pair.
571 SmallVector<DbgRange, 4>::const_iterator RI = Ranges.begin();
572 const MCSymbol *StartLabel = getLabelBeforeInsn(RI->first);
573 const MCSymbol *EndLabel = getLabelAfterInsn(RI->second);
575 if (StartLabel == 0 || EndLabel == 0) {
576 assert (0 && "Unexpected Start and End labels for a inlined scope!");
579 assert(StartLabel->isDefined() &&
580 "Invalid starting label for an inlined scope!");
581 assert(EndLabel->isDefined() &&
582 "Invalid end label for an inlined scope!");
584 if (!Scope->getScopeNode())
586 DIScope DS(Scope->getScopeNode());
587 DISubprogram InlinedSP = getDISubprogram(DS);
588 CompileUnit *TheCU = getCompileUnit(InlinedSP);
589 DIE *OriginDIE = TheCU->getDIE(InlinedSP);
591 DEBUG(dbgs() << "Unable to find original DIE for inlined subprogram.");
594 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine);
595 TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin,
596 dwarf::DW_FORM_ref4, OriginDIE);
598 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, StartLabel);
599 TheCU->addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr, EndLabel);
601 InlinedSubprogramDIEs.insert(OriginDIE);
603 // Track the start label for this inlined function.
604 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator
605 I = InlineInfo.find(InlinedSP);
607 if (I == InlineInfo.end()) {
608 InlineInfo[InlinedSP].push_back(std::make_pair(StartLabel,
610 InlinedSPNodes.push_back(InlinedSP);
612 I->second.push_back(std::make_pair(StartLabel, ScopeDIE));
614 DILocation DL(Scope->getInlinedAt());
615 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_file, 0, TheCU->getID());
616 TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_line, 0, DL.getLineNumber());
621 /// isUnsignedDIType - Return true if type encoding is unsigned.
622 static bool isUnsignedDIType(DIType Ty) {
623 DIDerivedType DTy(Ty);
625 return isUnsignedDIType(DTy.getTypeDerivedFrom());
629 unsigned Encoding = BTy.getEncoding();
630 if (Encoding == dwarf::DW_ATE_unsigned ||
631 Encoding == dwarf::DW_ATE_unsigned_char)
637 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
638 DIE *DwarfDebug::constructVariableDIE(DbgVariable *DV, DbgScope *Scope) {
639 StringRef Name = DV->getName();
643 // Translate tag to proper Dwarf tag. The result variable is dropped for
646 switch (DV->getTag()) {
647 case dwarf::DW_TAG_return_variable:
649 case dwarf::DW_TAG_arg_variable:
650 Tag = dwarf::DW_TAG_formal_parameter;
652 case dwarf::DW_TAG_auto_variable: // fall thru
654 Tag = dwarf::DW_TAG_variable;
658 // Define variable debug information entry.
659 DIE *VariableDie = new DIE(Tag);
660 CompileUnit *VariableCU = getCompileUnit(DV->getVariable());
662 DenseMap<const DbgVariable *, const DbgVariable *>::iterator
663 V2AVI = VarToAbstractVarMap.find(DV);
664 if (V2AVI != VarToAbstractVarMap.end())
665 AbsDIE = V2AVI->second->getDIE();
668 VariableCU->addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin,
669 dwarf::DW_FORM_ref4, AbsDIE);
671 VariableCU->addString(VariableDie, dwarf::DW_AT_name, dwarf::DW_FORM_string,
673 VariableCU->addSourceLine(VariableDie, DV->getVariable());
675 // Add variable type.
676 VariableCU->addType(VariableDie, DV->getType());
679 if (Tag == dwarf::DW_TAG_formal_parameter && DV->getType().isArtificial())
680 VariableCU->addUInt(VariableDie, dwarf::DW_AT_artificial,
681 dwarf::DW_FORM_flag, 1);
682 else if (DIVariable(DV->getVariable()).isArtificial())
683 VariableCU->addUInt(VariableDie, dwarf::DW_AT_artificial,
684 dwarf::DW_FORM_flag, 1);
686 if (Scope->isAbstractScope()) {
687 DV->setDIE(VariableDie);
691 // Add variable address.
693 unsigned Offset = DV->getDotDebugLocOffset();
695 VariableCU->addLabel(VariableDie, dwarf::DW_AT_location, dwarf::DW_FORM_data4,
696 Asm->GetTempSymbol("debug_loc", Offset));
697 DV->setDIE(VariableDie);
698 UseDotDebugLocEntry.insert(VariableDie);
702 // Check if variable is described by a DBG_VALUE instruction.
703 DenseMap<const DbgVariable *, const MachineInstr *>::iterator DVI =
704 DbgVariableToDbgInstMap.find(DV);
705 if (DVI != DbgVariableToDbgInstMap.end()) {
706 const MachineInstr *DVInsn = DVI->second;
707 bool updated = false;
708 // FIXME : Handle getNumOperands != 3
709 if (DVInsn->getNumOperands() == 3) {
710 if (DVInsn->getOperand(0).isReg()) {
711 const MachineOperand RegOp = DVInsn->getOperand(0);
712 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
713 if (DVInsn->getOperand(1).isImm() &&
714 TRI->getFrameRegister(*Asm->MF) == RegOp.getReg()) {
715 unsigned FrameReg = 0;
716 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
718 TFI->getFrameIndexReference(*Asm->MF,
719 DVInsn->getOperand(1).getImm(),
721 MachineLocation Location(FrameReg, Offset);
722 VariableCU->addVariableAddress(DV, VariableDie, Location);
724 } else if (RegOp.getReg())
725 VariableCU->addVariableAddress(DV, VariableDie,
726 MachineLocation(RegOp.getReg()));
729 else if (DVInsn->getOperand(0).isImm())
731 VariableCU->addConstantValue(VariableDie, DVInsn->getOperand(0),
733 else if (DVInsn->getOperand(0).isFPImm())
735 VariableCU->addConstantFPValue(VariableDie, DVInsn->getOperand(0));
736 else if (DVInsn->getOperand(0).isCImm())
738 VariableCU->addConstantValue(VariableDie,
739 DVInsn->getOperand(0).getCImm(),
740 isUnsignedDIType(DV->getType()));
742 VariableCU->addVariableAddress(DV, VariableDie,
743 Asm->getDebugValueLocation(DVInsn));
747 // If variableDie is not updated then DBG_VALUE instruction does not
748 // have valid variable info.
752 DV->setDIE(VariableDie);
756 // .. else use frame index, if available.
758 if (findVariableFrameIndex(DV, &FI)) {
759 unsigned FrameReg = 0;
760 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
762 TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
763 MachineLocation Location(FrameReg, Offset);
764 VariableCU->addVariableAddress(DV, VariableDie, Location);
767 DV->setDIE(VariableDie);
772 /// constructScopeDIE - Construct a DIE for this scope.
773 DIE *DwarfDebug::constructScopeDIE(DbgScope *Scope) {
774 if (!Scope || !Scope->getScopeNode())
777 SmallVector <DIE *, 8> Children;
779 // Collect arguments for current function.
780 if (Scope == CurrentFnDbgScope)
781 for (unsigned i = 0, N = CurrentFnArguments.size(); i < N; ++i)
782 if (DbgVariable *ArgDV = CurrentFnArguments[i])
783 if (DIE *Arg = constructVariableDIE(ArgDV, Scope))
784 Children.push_back(Arg);
786 // Collect lexical scope childrens first.
787 const SmallVector<DbgVariable *, 8> &Variables = Scope->getDbgVariables();
788 for (unsigned i = 0, N = Variables.size(); i < N; ++i)
789 if (DIE *Variable = constructVariableDIE(Variables[i], Scope))
790 Children.push_back(Variable);
791 const SmallVector<DbgScope *, 4> &Scopes = Scope->getScopes();
792 for (unsigned j = 0, M = Scopes.size(); j < M; ++j)
793 if (DIE *Nested = constructScopeDIE(Scopes[j]))
794 Children.push_back(Nested);
795 DIScope DS(Scope->getScopeNode());
796 DIE *ScopeDIE = NULL;
797 if (Scope->getInlinedAt())
798 ScopeDIE = constructInlinedScopeDIE(Scope);
799 else if (DS.isSubprogram()) {
800 ProcessedSPNodes.insert(DS);
801 if (Scope->isAbstractScope()) {
802 ScopeDIE = getCompileUnit(DS)->getDIE(DS);
803 // Note down abstract DIE.
805 AbstractSPDies.insert(std::make_pair(DS, ScopeDIE));
808 ScopeDIE = updateSubprogramScopeDIE(DS);
811 // There is no need to emit empty lexical block DIE.
812 if (Children.empty())
814 ScopeDIE = constructLexicalScopeDIE(Scope);
817 if (!ScopeDIE) return NULL;
820 for (SmallVector<DIE *, 8>::iterator I = Children.begin(),
821 E = Children.end(); I != E; ++I)
822 ScopeDIE->addChild(*I);
824 if (DS.isSubprogram())
825 getCompileUnit(DS)->addPubTypes(DISubprogram(DS));
830 /// GetOrCreateSourceID - Look up the source id with the given directory and
831 /// source file names. If none currently exists, create a new id and insert it
832 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames
835 unsigned DwarfDebug::GetOrCreateSourceID(StringRef FileName,
837 // If FE did not provide a file name, then assume stdin.
838 if (FileName.empty())
839 return GetOrCreateSourceID("<stdin>", StringRef());
841 // MCStream expects full path name as filename.
842 if (!DirName.empty() && !sys::path::is_absolute(FileName)) {
843 SmallString<128> FullPathName = DirName;
844 sys::path::append(FullPathName, FileName);
845 // Here FullPathName will be copied into StringMap by GetOrCreateSourceID.
846 return GetOrCreateSourceID(StringRef(FullPathName), StringRef());
849 StringMapEntry<unsigned> &Entry = SourceIdMap.GetOrCreateValue(FileName);
850 if (Entry.getValue())
851 return Entry.getValue();
853 unsigned SrcId = SourceIdMap.size();
854 Entry.setValue(SrcId);
856 // Print out a .file directive to specify files for .loc directives.
857 Asm->OutStreamer.EmitDwarfFileDirective(SrcId, Entry.getKey());
862 /// constructCompileUnit - Create new CompileUnit for the given
863 /// metadata node with tag DW_TAG_compile_unit.
864 void DwarfDebug::constructCompileUnit(const MDNode *N) {
865 DICompileUnit DIUnit(N);
866 StringRef FN = DIUnit.getFilename();
867 StringRef Dir = DIUnit.getDirectory();
868 unsigned ID = GetOrCreateSourceID(FN, Dir);
870 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
871 CompileUnit *NewCU = new CompileUnit(ID, Die, Asm, this);
872 NewCU->addString(Die, dwarf::DW_AT_producer, dwarf::DW_FORM_string,
873 DIUnit.getProducer());
874 NewCU->addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
875 DIUnit.getLanguage());
876 NewCU->addString(Die, dwarf::DW_AT_name, dwarf::DW_FORM_string, FN);
877 // Use DW_AT_entry_pc instead of DW_AT_low_pc/DW_AT_high_pc pair. This
878 // simplifies debug range entries.
879 NewCU->addUInt(Die, dwarf::DW_AT_entry_pc, dwarf::DW_FORM_addr, 0);
880 // DW_AT_stmt_list is a offset of line number information for this
881 // compile unit in debug_line section.
882 if(Asm->MAI->doesDwarfRequireRelocationForSectionOffset())
883 NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
884 Asm->GetTempSymbol("section_line"));
886 NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0);
889 NewCU->addString(Die, dwarf::DW_AT_comp_dir, dwarf::DW_FORM_string, Dir);
890 if (DIUnit.isOptimized())
891 NewCU->addUInt(Die, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
893 StringRef Flags = DIUnit.getFlags();
895 NewCU->addString(Die, dwarf::DW_AT_APPLE_flags, dwarf::DW_FORM_string, Flags);
897 unsigned RVer = DIUnit.getRunTimeVersion();
899 NewCU->addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
900 dwarf::DW_FORM_data1, RVer);
904 CUMap.insert(std::make_pair(N, NewCU));
907 /// getCompielUnit - Get CompileUnit DIE.
908 CompileUnit *DwarfDebug::getCompileUnit(const MDNode *N) const {
909 assert (N && "Invalid DwarfDebug::getCompileUnit argument!");
911 const MDNode *CUNode = NULL;
912 if (D.isCompileUnit())
914 else if (D.isSubprogram())
915 CUNode = DISubprogram(N).getCompileUnit();
917 CUNode = DIType(N).getCompileUnit();
918 else if (D.isGlobalVariable())
919 CUNode = DIGlobalVariable(N).getCompileUnit();
920 else if (D.isVariable())
921 CUNode = DIVariable(N).getCompileUnit();
922 else if (D.isNameSpace())
923 CUNode = DINameSpace(N).getCompileUnit();
925 CUNode = DIFile(N).getCompileUnit();
929 DenseMap<const MDNode *, CompileUnit *>::const_iterator I
930 = CUMap.find(CUNode);
931 if (I == CUMap.end())
936 // Return const exprssion if value is a GEP to access merged global
938 // i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
939 static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
940 const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
941 if (!CE || CE->getNumOperands() != 3 ||
942 CE->getOpcode() != Instruction::GetElementPtr)
945 // First operand points to a global value.
946 if (!isa<GlobalValue>(CE->getOperand(0)))
949 // Second operand is zero.
950 const ConstantInt *CI =
951 dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
952 if (!CI || !CI->isZero())
955 // Third operand is offset.
956 if (!isa<ConstantInt>(CE->getOperand(2)))
962 /// constructGlobalVariableDIE - Construct global variable DIE.
963 void DwarfDebug::constructGlobalVariableDIE(const MDNode *N) {
964 DIGlobalVariable GV(N);
966 // If debug information is malformed then ignore it.
967 if (GV.Verify() == false)
970 // Check for pre-existence.
971 CompileUnit *TheCU = getCompileUnit(N);
972 if (TheCU->getDIE(GV))
975 DIType GTy = GV.getType();
976 DIE *VariableDIE = new DIE(GV.getTag());
978 bool isGlobalVariable = GV.getGlobal() != NULL;
981 TheCU->addString(VariableDIE, dwarf::DW_AT_name, dwarf::DW_FORM_string,
982 GV.getDisplayName());
983 StringRef LinkageName = GV.getLinkageName();
984 if (!LinkageName.empty() && isGlobalVariable)
985 TheCU->addString(VariableDIE, dwarf::DW_AT_MIPS_linkage_name,
986 dwarf::DW_FORM_string,
987 getRealLinkageName(LinkageName));
989 TheCU->addType(VariableDIE, GTy);
992 if (!GV.isLocalToUnit()) {
993 TheCU->addUInt(VariableDIE, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
995 TheCU->addGlobal(GV.getName(), VariableDIE);
997 // Add line number info.
998 TheCU->addSourceLine(VariableDIE, GV);
1000 TheCU->insertDIE(N, VariableDIE);
1001 // Add to context owner.
1002 DIDescriptor GVContext = GV.getContext();
1003 TheCU->addToContextOwner(VariableDIE, GVContext);
1005 if (isGlobalVariable) {
1006 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1007 TheCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
1008 TheCU->addLabel(Block, 0, dwarf::DW_FORM_udata,
1009 Asm->Mang->getSymbol(GV.getGlobal()));
1010 // Do not create specification DIE if context is either compile unit
1012 if (GV.isDefinition() && !GVContext.isCompileUnit() &&
1013 !GVContext.isFile() && !isSubprogramContext(GVContext)) {
1014 // Create specification DIE.
1015 DIE *VariableSpecDIE = new DIE(dwarf::DW_TAG_variable);
1016 TheCU->addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification,
1017 dwarf::DW_FORM_ref4, VariableDIE);
1018 TheCU->addBlock(VariableSpecDIE, dwarf::DW_AT_location, 0, Block);
1019 TheCU->addUInt(VariableDIE, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
1020 TheCU->addDie(VariableSpecDIE);
1022 TheCU->addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
1024 } else if (const ConstantInt *CI =
1025 dyn_cast_or_null<ConstantInt>(GV.getConstant()))
1026 TheCU->addConstantValue(VariableDIE, CI, isUnsignedDIType(GTy));
1027 else if (const ConstantExpr *CE = getMergedGlobalExpr(N->getOperand(11))) {
1028 // GV is a merged global.
1029 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1030 TheCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
1031 TheCU->addLabel(Block, 0, dwarf::DW_FORM_udata,
1032 Asm->Mang->getSymbol(cast<GlobalValue>(CE->getOperand(0))));
1033 ConstantInt *CII = cast<ConstantInt>(CE->getOperand(2));
1034 TheCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1035 TheCU->addUInt(Block, 0, dwarf::DW_FORM_udata, CII->getZExtValue());
1036 TheCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1037 TheCU->addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
1043 /// construct SubprogramDIE - Construct subprogram DIE.
1044 void DwarfDebug::constructSubprogramDIE(const MDNode *N) {
1047 // Check for pre-existence.
1048 CompileUnit *TheCU = getCompileUnit(N);
1049 if (TheCU->getDIE(N))
1052 if (!SP.isDefinition())
1053 // This is a method declaration which will be handled while constructing
1057 DIE *SubprogramDie = createSubprogramDIE(SP);
1060 TheCU->insertDIE(N, SubprogramDie);
1062 // Add to context owner.
1063 TheCU->addToContextOwner(SubprogramDie, SP.getContext());
1065 // Expose as global.
1066 TheCU->addGlobal(SP.getName(), SubprogramDie);
1071 /// beginModule - Emit all Dwarf sections that should come prior to the
1072 /// content. Create global DIEs and emit initial debug info sections.
1073 /// This is inovked by the target AsmPrinter.
1074 void DwarfDebug::beginModule(Module *M) {
1075 if (DisableDebugInfoPrinting)
1078 // If module has named metadata anchors then use them, otherwise scan the module
1079 // using debug info finder to collect debug info.
1080 NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
1083 NamedMDNode *GV_Nodes = M->getNamedMetadata("llvm.dbg.gv");
1084 NamedMDNode *SP_Nodes = M->getNamedMetadata("llvm.dbg.sp");
1085 if (!GV_Nodes && !SP_Nodes)
1086 // If there are not any global variables or any functions then
1087 // there is not any debug info in this module.
1090 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i)
1091 constructCompileUnit(CU_Nodes->getOperand(i));
1094 for (unsigned i = 0, e = GV_Nodes->getNumOperands(); i != e; ++i)
1095 constructGlobalVariableDIE(GV_Nodes->getOperand(i));
1098 for (unsigned i = 0, e = SP_Nodes->getNumOperands(); i != e; ++i)
1099 constructSubprogramDIE(SP_Nodes->getOperand(i));
1103 DebugInfoFinder DbgFinder;
1104 DbgFinder.processModule(*M);
1106 bool HasDebugInfo = false;
1107 // Scan all the compile-units to see if there are any marked as the main unit.
1108 // if not, we do not generate debug info.
1109 for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
1110 E = DbgFinder.compile_unit_end(); I != E; ++I) {
1111 if (DICompileUnit(*I).isMain()) {
1112 HasDebugInfo = true;
1116 if (!HasDebugInfo) return;
1118 // Create all the compile unit DIEs.
1119 for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
1120 E = DbgFinder.compile_unit_end(); I != E; ++I)
1121 constructCompileUnit(*I);
1123 // Create DIEs for each global variable.
1124 for (DebugInfoFinder::iterator I = DbgFinder.global_variable_begin(),
1125 E = DbgFinder.global_variable_end(); I != E; ++I)
1126 constructGlobalVariableDIE(*I);
1128 // Create DIEs for each subprogram.
1129 for (DebugInfoFinder::iterator I = DbgFinder.subprogram_begin(),
1130 E = DbgFinder.subprogram_end(); I != E; ++I)
1131 constructSubprogramDIE(*I);
1134 // Tell MMI that we have debug info.
1135 MMI->setDebugInfoAvailability(true);
1137 // Emit initial sections.
1138 EmitSectionLabels();
1140 //getOrCreateTypeDIE
1141 if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.enum"))
1142 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1143 DIType Ty(NMD->getOperand(i));
1144 getCompileUnit(Ty)->getOrCreateTypeDIE(Ty);
1147 if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.ty"))
1148 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1149 DIType Ty(NMD->getOperand(i));
1150 getCompileUnit(Ty)->getOrCreateTypeDIE(Ty);
1153 // Prime section data.
1154 SectionMap.insert(Asm->getObjFileLowering().getTextSection());
1157 /// endModule - Emit all Dwarf sections that should come after the content.
1159 void DwarfDebug::endModule() {
1160 if (!FirstCU) return;
1161 const Module *M = MMI->getModule();
1162 DenseMap<const MDNode *, DbgScope *> DeadFnScopeMap;
1163 if (NamedMDNode *AllSPs = M->getNamedMetadata("llvm.dbg.sp")) {
1164 for (unsigned SI = 0, SE = AllSPs->getNumOperands(); SI != SE; ++SI) {
1165 if (ProcessedSPNodes.count(AllSPs->getOperand(SI)) != 0) continue;
1166 DISubprogram SP(AllSPs->getOperand(SI));
1167 if (!SP.Verify()) continue;
1169 // Collect info for variables that were optimized out.
1170 if (!SP.isDefinition()) continue;
1171 StringRef FName = SP.getLinkageName();
1173 FName = SP.getName();
1174 NamedMDNode *NMD = getFnSpecificMDNode(*(MMI->getModule()), FName);
1176 unsigned E = NMD->getNumOperands();
1178 DbgScope *Scope = new DbgScope(NULL, DIDescriptor(SP), NULL);
1179 DeadFnScopeMap[SP] = Scope;
1180 for (unsigned I = 0; I != E; ++I) {
1181 DIVariable DV(NMD->getOperand(I));
1182 if (!DV.Verify()) continue;
1183 Scope->addVariable(new DbgVariable(DV));
1186 // Construct subprogram DIE and add variables DIEs.
1187 constructSubprogramDIE(SP);
1188 DIE *ScopeDIE = getCompileUnit(SP)->getDIE(SP);
1189 const SmallVector<DbgVariable *, 8> &Variables = Scope->getDbgVariables();
1190 for (unsigned i = 0, N = Variables.size(); i < N; ++i) {
1191 DIE *VariableDIE = constructVariableDIE(Variables[i], Scope);
1193 ScopeDIE->addChild(VariableDIE);
1198 // Attach DW_AT_inline attribute with inlined subprogram DIEs.
1199 for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(),
1200 AE = InlinedSubprogramDIEs.end(); AI != AE; ++AI) {
1202 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, 0, dwarf::DW_INL_inlined);
1205 for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
1206 CE = ContainingTypeMap.end(); CI != CE; ++CI) {
1207 DIE *SPDie = CI->first;
1208 const MDNode *N = dyn_cast_or_null<MDNode>(CI->second);
1210 DIE *NDie = getCompileUnit(N)->getDIE(N);
1211 if (!NDie) continue;
1212 getCompileUnit(N)->addDIEEntry(SPDie, dwarf::DW_AT_containing_type,
1213 dwarf::DW_FORM_ref4, NDie);
1216 // Standard sections final addresses.
1217 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getTextSection());
1218 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("text_end"));
1219 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getDataSection());
1220 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("data_end"));
1222 // End text sections.
1223 for (unsigned i = 1, N = SectionMap.size(); i <= N; ++i) {
1224 Asm->OutStreamer.SwitchSection(SectionMap[i]);
1225 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_end", i));
1228 // Compute DIE offsets and sizes.
1229 computeSizeAndOffsets();
1231 // Emit all the DIEs into a debug info section
1234 // Corresponding abbreviations into a abbrev section.
1235 emitAbbreviations();
1237 // Emit info into a debug pubnames section.
1238 emitDebugPubNames();
1240 // Emit info into a debug pubtypes section.
1241 emitDebugPubTypes();
1243 // Emit info into a debug loc section.
1246 // Emit info into a debug aranges section.
1249 // Emit info into a debug ranges section.
1252 // Emit info into a debug macinfo section.
1255 // Emit inline info.
1256 emitDebugInlineInfo();
1258 // Emit info into a debug str section.
1262 DeleteContainerSeconds(DeadFnScopeMap);
1263 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
1264 E = CUMap.end(); I != E; ++I)
1266 FirstCU = NULL; // Reset for the next Module, if any.
1269 /// findAbstractVariable - Find abstract variable, if any, associated with Var.
1270 DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &Var,
1271 DebugLoc ScopeLoc) {
1273 DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var);
1275 return AbsDbgVariable;
1277 LLVMContext &Ctx = Var->getContext();
1278 DbgScope *Scope = AbstractScopes.lookup(ScopeLoc.getScope(Ctx));
1282 AbsDbgVariable = new DbgVariable(Var);
1283 Scope->addVariable(AbsDbgVariable);
1284 AbstractVariables[Var] = AbsDbgVariable;
1285 return AbsDbgVariable;
1288 /// addCurrentFnArgument - If Var is an current function argument that add
1289 /// it in CurrentFnArguments list.
1290 bool DwarfDebug::addCurrentFnArgument(const MachineFunction *MF,
1291 DbgVariable *Var, DbgScope *Scope) {
1292 if (Scope != CurrentFnDbgScope)
1294 DIVariable DV = Var->getVariable();
1295 if (DV.getTag() != dwarf::DW_TAG_arg_variable)
1297 unsigned ArgNo = DV.getArgNumber();
1301 size_t Size = CurrentFnArguments.size();
1303 CurrentFnArguments.resize(MF->getFunction()->arg_size());
1304 // llvm::Function argument size is not good indicator of how many
1305 // arguments does the function have at source level.
1307 CurrentFnArguments.resize(ArgNo * 2);
1308 CurrentFnArguments[ArgNo - 1] = Var;
1312 /// collectVariableInfoFromMMITable - Collect variable information from
1313 /// side table maintained by MMI.
1315 DwarfDebug::collectVariableInfoFromMMITable(const MachineFunction * MF,
1316 SmallPtrSet<const MDNode *, 16> &Processed) {
1317 const LLVMContext &Ctx = Asm->MF->getFunction()->getContext();
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 = 0;
1328 if (const MDNode *IA = VP.second.getInlinedAt(Ctx))
1329 Scope = ConcreteScopes.lookup(IA);
1331 Scope = DbgScopeMap.lookup(VP.second.getScope(Ctx));
1333 // If variable scope is not found then skip this variable.
1337 DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
1338 DbgVariable *RegVar = new DbgVariable(DV);
1339 recordVariableFrameIndex(RegVar, VP.first);
1340 if (!addCurrentFnArgument(MF, RegVar, Scope))
1341 Scope->addVariable(RegVar);
1342 if (AbsDbgVariable) {
1343 recordVariableFrameIndex(AbsDbgVariable, VP.first);
1344 VarToAbstractVarMap[RegVar] = AbsDbgVariable;
1349 /// isDbgValueInDefinedReg - Return true if debug value, encoded by
1350 /// DBG_VALUE instruction, is in a defined reg.
1351 static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
1352 assert (MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
1353 return MI->getNumOperands() == 3 &&
1354 MI->getOperand(0).isReg() && MI->getOperand(0).getReg() &&
1355 MI->getOperand(1).isImm() && MI->getOperand(1).getImm() == 0;
1358 /// getDebugLocEntry - Get .debug_loc entry for the instraction range starting
1360 static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
1361 const MCSymbol *FLabel,
1362 const MCSymbol *SLabel,
1363 const MachineInstr *MI) {
1364 const MDNode *Var = MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1366 if (MI->getNumOperands() != 3) {
1367 MachineLocation MLoc = Asm->getDebugValueLocation(MI);
1368 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1370 if (MI->getOperand(0).isReg() && MI->getOperand(1).isImm()) {
1371 MachineLocation MLoc;
1372 MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
1373 return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
1375 if (MI->getOperand(0).isImm())
1376 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getImm());
1377 if (MI->getOperand(0).isFPImm())
1378 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getFPImm());
1379 if (MI->getOperand(0).isCImm())
1380 return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getCImm());
1382 assert (0 && "Unexpected 3 operand DBG_VALUE instruction!");
1383 return DotDebugLocEntry();
1386 /// collectVariableInfo - Populate DbgScope entries with variables' info.
1388 DwarfDebug::collectVariableInfo(const MachineFunction *MF,
1389 SmallPtrSet<const MDNode *, 16> &Processed) {
1391 /// collection info from MMI table.
1392 collectVariableInfoFromMMITable(MF, Processed);
1394 for (SmallVectorImpl<const MDNode*>::const_iterator
1395 UVI = UserVariables.begin(), UVE = UserVariables.end(); UVI != UVE;
1397 const MDNode *Var = *UVI;
1398 if (Processed.count(Var))
1401 // History contains relevant DBG_VALUE instructions for Var and instructions
1403 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1404 if (History.empty())
1406 const MachineInstr *MInsn = History.front();
1409 DbgScope *Scope = NULL;
1410 if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
1411 DISubprogram(DV.getContext()).describes(MF->getFunction()))
1412 Scope = CurrentFnDbgScope;
1414 Scope = findDbgScope(MInsn);
1415 // If variable scope is not found then skip this variable.
1419 Processed.insert(DV);
1420 assert(MInsn->isDebugValue() && "History must begin with debug value");
1421 DbgVariable *RegVar = new DbgVariable(DV);
1422 if (!addCurrentFnArgument(MF, RegVar, Scope))
1423 Scope->addVariable(RegVar);
1424 if (DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc())) {
1425 DbgVariableToDbgInstMap[AbsVar] = MInsn;
1426 VarToAbstractVarMap[RegVar] = AbsVar;
1429 // Simple ranges that are fully coalesced.
1430 if (History.size() <= 1 || (History.size() == 2 &&
1431 MInsn->isIdenticalTo(History.back()))) {
1432 DbgVariableToDbgInstMap[RegVar] = MInsn;
1436 // handle multiple DBG_VALUE instructions describing one variable.
1437 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1439 for (SmallVectorImpl<const MachineInstr*>::const_iterator
1440 HI = History.begin(), HE = History.end(); HI != HE; ++HI) {
1441 const MachineInstr *Begin = *HI;
1442 assert(Begin->isDebugValue() && "Invalid History entry");
1444 // Check if DBG_VALUE is truncating a range.
1445 if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg()
1446 && !Begin->getOperand(0).getReg())
1449 // Compute the range for a register location.
1450 const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
1451 const MCSymbol *SLabel = 0;
1454 // If Begin is the last instruction in History then its value is valid
1455 // until the end of the function.
1456 SLabel = FunctionEndSym;
1458 const MachineInstr *End = HI[1];
1459 DEBUG(dbgs() << "DotDebugLoc Pair:\n"
1460 << "\t" << *Begin << "\t" << *End << "\n");
1461 if (End->isDebugValue())
1462 SLabel = getLabelBeforeInsn(End);
1464 // End is a normal instruction clobbering the range.
1465 SLabel = getLabelAfterInsn(End);
1466 assert(SLabel && "Forgot label after clobber instruction");
1471 // The value is valid until the next DBG_VALUE or clobber.
1472 DotDebugLocEntries.push_back(getDebugLocEntry(Asm, FLabel, SLabel, Begin));
1474 DotDebugLocEntries.push_back(DotDebugLocEntry());
1477 // Collect info for variables that were optimized out.
1478 const Function *F = MF->getFunction();
1479 if (NamedMDNode *NMD = getFnSpecificMDNode(*(F->getParent()), F->getName())) {
1480 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1481 DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
1482 if (!DV || !Processed.insert(DV))
1484 DbgScope *Scope = DbgScopeMap.lookup(DV.getContext());
1486 Scope->addVariable(new DbgVariable(DV));
1491 /// getLabelBeforeInsn - Return Label preceding the instruction.
1492 const MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1493 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1494 assert(Label && "Didn't insert label before instruction");
1498 /// getLabelAfterInsn - Return Label immediately following the instruction.
1499 const MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1500 return LabelsAfterInsn.lookup(MI);
1503 /// beginInstruction - Process beginning of an instruction.
1504 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1505 // Check if source location changes, but ignore DBG_VALUE locations.
1506 if (!MI->isDebugValue()) {
1507 DebugLoc DL = MI->getDebugLoc();
1508 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1509 unsigned Flags = DWARF2_FLAG_IS_STMT;
1511 if (DL == PrologEndLoc) {
1512 Flags |= DWARF2_FLAG_PROLOGUE_END;
1513 PrologEndLoc = DebugLoc();
1515 if (!DL.isUnknown()) {
1516 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1517 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1519 recordSourceLine(0, 0, 0, 0);
1523 // Insert labels where requested.
1524 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1525 LabelsBeforeInsn.find(MI);
1528 if (I == LabelsBeforeInsn.end())
1531 // Label already assigned.
1536 PrevLabel = MMI->getContext().CreateTempSymbol();
1537 Asm->OutStreamer.EmitLabel(PrevLabel);
1539 I->second = PrevLabel;
1542 /// endInstruction - Process end of an instruction.
1543 void DwarfDebug::endInstruction(const MachineInstr *MI) {
1544 // Don't create a new label after DBG_VALUE instructions.
1545 // They don't generate code.
1546 if (!MI->isDebugValue())
1549 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1550 LabelsAfterInsn.find(MI);
1553 if (I == LabelsAfterInsn.end())
1556 // Label already assigned.
1560 // We need a label after this instruction.
1562 PrevLabel = MMI->getContext().CreateTempSymbol();
1563 Asm->OutStreamer.EmitLabel(PrevLabel);
1565 I->second = PrevLabel;
1568 /// getOrCreateDbgScope - Create DbgScope for the scope.
1569 DbgScope *DwarfDebug::getOrCreateDbgScope(DebugLoc DL, LLVMContext &Ctx) {
1570 MDNode *Scope = NULL;
1571 MDNode *InlinedAt = NULL;
1572 DL.getScopeAndInlinedAt(Scope, InlinedAt, Ctx);
1575 DbgScope *WScope = DbgScopeMap.lookup(Scope);
1578 WScope = new DbgScope(NULL, DIDescriptor(Scope), NULL);
1579 DbgScopeMap.insert(std::make_pair(Scope, WScope));
1580 if (DIDescriptor(Scope).isLexicalBlock()) {
1582 getOrCreateDbgScope(DebugLoc::getFromDILexicalBlock(Scope), Ctx);
1583 WScope->setParent(Parent);
1584 Parent->addScope(WScope);
1585 } else if (DIDescriptor(Scope).isSubprogram()
1586 && DISubprogram(Scope).describes(Asm->MF->getFunction()))
1587 CurrentFnDbgScope = WScope;
1592 getOrCreateAbstractScope(Scope);
1593 DbgScope *WScope = DbgScopeMap.lookup(InlinedAt);
1597 WScope = new DbgScope(NULL, DIDescriptor(Scope), InlinedAt);
1598 DbgScopeMap.insert(std::make_pair(InlinedAt, WScope));
1600 getOrCreateDbgScope(DebugLoc::getFromDILocation(InlinedAt), Ctx);
1601 WScope->setParent(Parent);
1602 Parent->addScope(WScope);
1604 ConcreteScopes[InlinedAt] = WScope;
1609 /// calculateDominanceGraph - Calculate dominance graph for DbgScope
1611 static void calculateDominanceGraph(DbgScope *Scope) {
1612 assert (Scope && "Unable to calculate scop edominance graph!");
1613 SmallVector<DbgScope *, 4> WorkStack;
1614 WorkStack.push_back(Scope);
1615 unsigned Counter = 0;
1616 while (!WorkStack.empty()) {
1617 DbgScope *WS = WorkStack.back();
1618 const SmallVector<DbgScope *, 4> &Children = WS->getScopes();
1619 bool visitedChildren = false;
1620 for (SmallVector<DbgScope *, 4>::const_iterator SI = Children.begin(),
1621 SE = Children.end(); SI != SE; ++SI) {
1622 DbgScope *ChildScope = *SI;
1623 if (!ChildScope->getDFSOut()) {
1624 WorkStack.push_back(ChildScope);
1625 visitedChildren = true;
1626 ChildScope->setDFSIn(++Counter);
1630 if (!visitedChildren) {
1631 WorkStack.pop_back();
1632 WS->setDFSOut(++Counter);
1637 /// printDbgScopeInfo - Print DbgScope info for each machine instruction.
1639 void printDbgScopeInfo(LLVMContext &Ctx, const MachineFunction *MF,
1640 DenseMap<const MachineInstr *, DbgScope *> &MI2ScopeMap)
1643 unsigned PrevDFSIn = 0;
1644 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1646 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1648 const MachineInstr *MInsn = II;
1649 MDNode *Scope = NULL;
1650 MDNode *InlinedAt = NULL;
1652 // Check if instruction has valid location information.
1653 DebugLoc MIDL = MInsn->getDebugLoc();
1654 if (!MIDL.isUnknown()) {
1655 MIDL.getScopeAndInlinedAt(Scope, InlinedAt, Ctx);
1659 DenseMap<const MachineInstr *, DbgScope *>::iterator DI =
1660 MI2ScopeMap.find(MInsn);
1661 if (DI != MI2ScopeMap.end()) {
1662 DbgScope *S = DI->second;
1663 dbgs() << S->getDFSIn();
1664 PrevDFSIn = S->getDFSIn();
1666 dbgs() << PrevDFSIn;
1668 dbgs() << " [ x" << PrevDFSIn;
1676 /// extractScopeInformation - Scan machine instructions in this function
1677 /// and collect DbgScopes. Return true, if at least one scope was found.
1678 bool DwarfDebug::extractScopeInformation() {
1679 // If scope information was extracted using .dbg intrinsics then there is not
1680 // any need to extract these information by scanning each instruction.
1681 if (!DbgScopeMap.empty())
1684 // Scan each instruction and create scopes. First build working set of scopes.
1685 LLVMContext &Ctx = Asm->MF->getFunction()->getContext();
1686 SmallVector<DbgRange, 4> MIRanges;
1687 DenseMap<const MachineInstr *, DbgScope *> MI2ScopeMap;
1689 const MachineInstr *RangeBeginMI = NULL;
1690 const MachineInstr *PrevMI = NULL;
1691 for (MachineFunction::const_iterator I = Asm->MF->begin(), E = Asm->MF->end();
1693 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1695 const MachineInstr *MInsn = II;
1697 // Check if instruction has valid location information.
1698 const DebugLoc MIDL = MInsn->getDebugLoc();
1699 if (MIDL.isUnknown()) {
1704 // If scope has not changed then skip this instruction.
1705 if (MIDL == PrevDL) {
1710 // Ignore DBG_VALUE. It does not contribute any instruction in output.
1711 if (MInsn->isDebugValue())
1715 // If we have alread seen a beginning of a instruction range and
1716 // current instruction scope does not match scope of first instruction
1717 // in this range then create a new instruction range.
1718 DEBUG(dbgs() << "Creating new instruction range :\n");
1719 DEBUG(dbgs() << "Begin Range at " << *RangeBeginMI);
1720 DEBUG(dbgs() << "End Range at " << *PrevMI);
1721 DEBUG(dbgs() << "Next Range starting at " << *MInsn);
1722 DEBUG(dbgs() << "------------------------\n");
1723 DbgRange R(RangeBeginMI, PrevMI);
1724 MI2ScopeMap[RangeBeginMI] = getOrCreateDbgScope(PrevDL, Ctx);
1725 MIRanges.push_back(R);
1728 // This is a beginning of a new instruction range.
1729 RangeBeginMI = MInsn;
1731 // Reset previous markers.
1737 // Create last instruction range.
1738 if (RangeBeginMI && PrevMI && !PrevDL.isUnknown()) {
1739 DbgRange R(RangeBeginMI, PrevMI);
1740 MIRanges.push_back(R);
1741 MI2ScopeMap[RangeBeginMI] = getOrCreateDbgScope(PrevDL, Ctx);
1744 if (!CurrentFnDbgScope)
1747 calculateDominanceGraph(CurrentFnDbgScope);
1749 printDbgScopeInfo(Ctx, Asm->MF, MI2ScopeMap);
1751 // Find ranges of instructions covered by each DbgScope;
1752 DbgScope *PrevDbgScope = NULL;
1753 for (SmallVector<DbgRange, 4>::const_iterator RI = MIRanges.begin(),
1754 RE = MIRanges.end(); RI != RE; ++RI) {
1755 const DbgRange &R = *RI;
1756 DbgScope *S = MI2ScopeMap.lookup(R.first);
1757 assert (S && "Lost DbgScope for a machine instruction!");
1758 if (PrevDbgScope && !PrevDbgScope->dominates(S))
1759 PrevDbgScope->closeInsnRange(S);
1760 S->openInsnRange(R.first);
1761 S->extendInsnRange(R.second);
1766 PrevDbgScope->closeInsnRange();
1768 identifyScopeMarkers();
1770 return !DbgScopeMap.empty();
1773 /// identifyScopeMarkers() -
1774 /// Each DbgScope has first instruction and last instruction to mark beginning
1775 /// and end of a scope respectively. Create an inverse map that list scopes
1776 /// starts (and ends) with an instruction. One instruction may start (or end)
1777 /// multiple scopes. Ignore scopes that are not reachable.
1778 void DwarfDebug::identifyScopeMarkers() {
1779 SmallVector<DbgScope *, 4> WorkList;
1780 WorkList.push_back(CurrentFnDbgScope);
1781 while (!WorkList.empty()) {
1782 DbgScope *S = WorkList.pop_back_val();
1784 const SmallVector<DbgScope *, 4> &Children = S->getScopes();
1785 if (!Children.empty())
1786 for (SmallVector<DbgScope *, 4>::const_iterator SI = Children.begin(),
1787 SE = Children.end(); SI != SE; ++SI)
1788 WorkList.push_back(*SI);
1790 if (S->isAbstractScope())
1793 const SmallVector<DbgRange, 4> &Ranges = S->getRanges();
1796 for (SmallVector<DbgRange, 4>::const_iterator RI = Ranges.begin(),
1797 RE = Ranges.end(); RI != RE; ++RI) {
1798 assert(RI->first && "DbgRange does not have first instruction!");
1799 assert(RI->second && "DbgRange does not have second instruction!");
1800 requestLabelBeforeInsn(RI->first);
1801 requestLabelAfterInsn(RI->second);
1806 /// getScopeNode - Get MDNode for DebugLoc's scope.
1807 static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
1808 if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
1809 return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
1810 return DL.getScope(Ctx);
1813 /// getFnDebugLoc - Walk up the scope chain of given debug loc and find
1814 /// line number info for the function.
1815 static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
1816 const MDNode *Scope = getScopeNode(DL, Ctx);
1817 DISubprogram SP = getDISubprogram(Scope);
1819 return DebugLoc::get(SP.getLineNumber(), 0, SP);
1823 /// beginFunction - Gather pre-function debug information. Assumes being
1824 /// emitted immediately after the function entry point.
1825 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1826 if (!MMI->hasDebugInfo()) return;
1827 if (!extractScopeInformation()) return;
1829 FunctionBeginSym = Asm->GetTempSymbol("func_begin",
1830 Asm->getFunctionNumber());
1831 // Assumes in correct section after the entry point.
1832 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1834 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
1836 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1837 /// LiveUserVar - Map physreg numbers to the MDNode they contain.
1838 std::vector<const MDNode*> LiveUserVar(TRI->getNumRegs());
1840 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1842 bool AtBlockEntry = true;
1843 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1845 const MachineInstr *MI = II;
1847 if (MI->isDebugValue()) {
1848 assert (MI->getNumOperands() > 1 && "Invalid machine instruction!");
1850 // Keep track of user variables.
1852 MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1854 // Variable is in a register, we need to check for clobbers.
1855 if (isDbgValueInDefinedReg(MI))
1856 LiveUserVar[MI->getOperand(0).getReg()] = Var;
1858 // Check the history of this variable.
1859 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1860 if (History.empty()) {
1861 UserVariables.push_back(Var);
1862 // The first mention of a function argument gets the FunctionBeginSym
1863 // label, so arguments are visible when breaking at function entry.
1865 if (DV.Verify() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
1866 DISubprogram(getDISubprogram(DV.getContext()))
1867 .describes(MF->getFunction()))
1868 LabelsBeforeInsn[MI] = FunctionBeginSym;
1870 // We have seen this variable before. Try to coalesce DBG_VALUEs.
1871 const MachineInstr *Prev = History.back();
1872 if (Prev->isDebugValue()) {
1873 // Coalesce identical entries at the end of History.
1874 if (History.size() >= 2 &&
1875 Prev->isIdenticalTo(History[History.size() - 2])) {
1876 DEBUG(dbgs() << "Coalesce identical DBG_VALUE entries:\n"
1878 << "\t" << *History[History.size() - 2] << "\n");
1882 // Terminate old register assignments that don't reach MI;
1883 MachineFunction::const_iterator PrevMBB = Prev->getParent();
1884 if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
1885 isDbgValueInDefinedReg(Prev)) {
1886 // Previous register assignment needs to terminate at the end of
1888 MachineBasicBlock::const_iterator LastMI =
1889 PrevMBB->getLastNonDebugInstr();
1890 if (LastMI == PrevMBB->end()) {
1891 // Drop DBG_VALUE for empty range.
1892 DEBUG(dbgs() << "Drop DBG_VALUE for empty range:\n"
1893 << "\t" << *Prev << "\n");
1897 // Terminate after LastMI.
1898 History.push_back(LastMI);
1903 History.push_back(MI);
1905 // Not a DBG_VALUE instruction.
1907 AtBlockEntry = false;
1909 // First known non DBG_VALUE location marks beginning of function
1911 if (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown())
1912 PrologEndLoc = MI->getDebugLoc();
1914 // Check if the instruction clobbers any registers with debug vars.
1915 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
1916 MOE = MI->operands_end(); MOI != MOE; ++MOI) {
1917 if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
1919 for (const unsigned *AI = TRI->getOverlaps(MOI->getReg());
1920 unsigned Reg = *AI; ++AI) {
1921 const MDNode *Var = LiveUserVar[Reg];
1924 // Reg is now clobbered.
1925 LiveUserVar[Reg] = 0;
1927 // Was MD last defined by a DBG_VALUE referring to Reg?
1928 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
1929 if (HistI == DbgValues.end())
1931 SmallVectorImpl<const MachineInstr*> &History = HistI->second;
1932 if (History.empty())
1934 const MachineInstr *Prev = History.back();
1935 // Sanity-check: Register assignments are terminated at the end of
1937 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
1939 // Is the variable still in Reg?
1940 if (!isDbgValueInDefinedReg(Prev) ||
1941 Prev->getOperand(0).getReg() != Reg)
1943 // Var is clobbered. Make sure the next instruction gets a label.
1944 History.push_back(MI);
1951 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
1953 SmallVectorImpl<const MachineInstr*> &History = I->second;
1954 if (History.empty())
1957 // Make sure the final register assignments are terminated.
1958 const MachineInstr *Prev = History.back();
1959 if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
1960 const MachineBasicBlock *PrevMBB = Prev->getParent();
1961 MachineBasicBlock::const_iterator LastMI = PrevMBB->getLastNonDebugInstr();
1962 if (LastMI == PrevMBB->end())
1963 // Drop DBG_VALUE for empty range.
1966 // Terminate after LastMI.
1967 History.push_back(LastMI);
1970 // Request labels for the full history.
1971 for (unsigned i = 0, e = History.size(); i != e; ++i) {
1972 const MachineInstr *MI = History[i];
1973 if (MI->isDebugValue())
1974 requestLabelBeforeInsn(MI);
1976 requestLabelAfterInsn(MI);
1980 PrevInstLoc = DebugLoc();
1981 PrevLabel = FunctionBeginSym;
1983 // Record beginning of function.
1984 if (!PrologEndLoc.isUnknown()) {
1985 DebugLoc FnStartDL = getFnDebugLoc(PrologEndLoc,
1986 MF->getFunction()->getContext());
1987 recordSourceLine(FnStartDL.getLine(), FnStartDL.getCol(),
1988 FnStartDL.getScope(MF->getFunction()->getContext()),
1989 DWARF2_FLAG_IS_STMT);
1993 /// endFunction - Gather and emit post-function debug information.
1995 void DwarfDebug::endFunction(const MachineFunction *MF) {
1996 if (!MMI->hasDebugInfo() || DbgScopeMap.empty()) return;
1998 if (CurrentFnDbgScope) {
2000 // Define end label for subprogram.
2001 FunctionEndSym = Asm->GetTempSymbol("func_end",
2002 Asm->getFunctionNumber());
2003 // Assumes in correct section after the entry point.
2004 Asm->OutStreamer.EmitLabel(FunctionEndSym);
2006 SmallPtrSet<const MDNode *, 16> ProcessedVars;
2007 collectVariableInfo(MF, ProcessedVars);
2009 // Construct abstract scopes.
2010 for (SmallVector<DbgScope *, 4>::iterator AI = AbstractScopesList.begin(),
2011 AE = AbstractScopesList.end(); AI != AE; ++AI) {
2012 DISubprogram SP((*AI)->getScopeNode());
2014 // Collect info for variables that were optimized out.
2015 StringRef FName = SP.getLinkageName();
2017 FName = SP.getName();
2018 if (NamedMDNode *NMD =
2019 getFnSpecificMDNode(*(MF->getFunction()->getParent()), FName)) {
2020 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2021 DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
2022 if (!DV || !ProcessedVars.insert(DV))
2024 DbgScope *Scope = AbstractScopes.lookup(DV.getContext());
2026 Scope->addVariable(new DbgVariable(DV));
2030 if (ProcessedSPNodes.count((*AI)->getScopeNode()) == 0)
2031 constructScopeDIE(*AI);
2034 DIE *CurFnDIE = constructScopeDIE(CurrentFnDbgScope);
2036 if (!DisableFramePointerElim(*MF))
2037 getCompileUnit(CurrentFnDbgScope->getScopeNode())->addUInt(CurFnDIE,
2038 dwarf::DW_AT_APPLE_omit_frame_ptr,
2039 dwarf::DW_FORM_flag, 1);
2042 DebugFrames.push_back(FunctionDebugFrameInfo(Asm->getFunctionNumber(),
2043 MMI->getFrameMoves()));
2047 CurrentFnDbgScope = NULL;
2048 DeleteContainerPointers(CurrentFnArguments);
2049 DbgVariableToFrameIndexMap.clear();
2050 VarToAbstractVarMap.clear();
2051 DbgVariableToDbgInstMap.clear();
2052 DeleteContainerSeconds(DbgScopeMap);
2053 UserVariables.clear();
2055 ConcreteScopes.clear();
2056 DeleteContainerSeconds(AbstractScopes);
2057 AbstractScopesList.clear();
2058 AbstractVariables.clear();
2059 LabelsBeforeInsn.clear();
2060 LabelsAfterInsn.clear();
2064 /// recordVariableFrameIndex - Record a variable's index.
2065 void DwarfDebug::recordVariableFrameIndex(const DbgVariable *V, int Index) {
2066 assert (V && "Invalid DbgVariable!");
2067 DbgVariableToFrameIndexMap[V] = Index;
2070 /// findVariableFrameIndex - Return true if frame index for the variable
2071 /// is found. Update FI to hold value of the index.
2072 bool DwarfDebug::findVariableFrameIndex(const DbgVariable *V, int *FI) {
2073 assert (V && "Invalid DbgVariable!");
2074 DenseMap<const DbgVariable *, int>::iterator I =
2075 DbgVariableToFrameIndexMap.find(V);
2076 if (I == DbgVariableToFrameIndexMap.end())
2082 /// findDbgScope - Find DbgScope for the debug loc attached with an
2084 DbgScope *DwarfDebug::findDbgScope(const MachineInstr *MInsn) {
2085 DbgScope *Scope = NULL;
2087 MInsn->getParent()->getParent()->getFunction()->getContext();
2088 DebugLoc DL = MInsn->getDebugLoc();
2093 if (const MDNode *IA = DL.getInlinedAt(Ctx))
2094 Scope = ConcreteScopes.lookup(IA);
2096 Scope = DbgScopeMap.lookup(DL.getScope(Ctx));
2102 /// recordSourceLine - Register a source line with debug info. Returns the
2103 /// unique label that was emitted and which provides correspondence to
2104 /// the source line list.
2105 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
2111 DIDescriptor Scope(S);
2113 if (Scope.isCompileUnit()) {
2114 DICompileUnit CU(S);
2115 Fn = CU.getFilename();
2116 Dir = CU.getDirectory();
2117 } else if (Scope.isFile()) {
2119 Fn = F.getFilename();
2120 Dir = F.getDirectory();
2121 } else if (Scope.isSubprogram()) {
2123 Fn = SP.getFilename();
2124 Dir = SP.getDirectory();
2125 } else if (Scope.isLexicalBlock()) {
2126 DILexicalBlock DB(S);
2127 Fn = DB.getFilename();
2128 Dir = DB.getDirectory();
2130 assert(0 && "Unexpected scope info");
2132 Src = GetOrCreateSourceID(Fn, Dir);
2134 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags,
2138 //===----------------------------------------------------------------------===//
2140 //===----------------------------------------------------------------------===//
2142 /// computeSizeAndOffset - Compute the size and offset of a DIE.
2145 DwarfDebug::computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last) {
2146 // Get the children.
2147 const std::vector<DIE *> &Children = Die->getChildren();
2149 // If not last sibling and has children then add sibling offset attribute.
2150 if (!Last && !Children.empty())
2151 Die->addSiblingOffset(DIEValueAllocator);
2153 // Record the abbreviation.
2154 assignAbbrevNumber(Die->getAbbrev());
2156 // Get the abbreviation for this DIE.
2157 unsigned AbbrevNumber = Die->getAbbrevNumber();
2158 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2161 Die->setOffset(Offset);
2163 // Start the size with the size of abbreviation code.
2164 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
2166 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2167 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2169 // Size the DIE attribute values.
2170 for (unsigned i = 0, N = Values.size(); i < N; ++i)
2171 // Size attribute value.
2172 Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
2174 // Size the DIE children if any.
2175 if (!Children.empty()) {
2176 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
2177 "Children flag not set");
2179 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2180 Offset = computeSizeAndOffset(Children[j], Offset, (j + 1) == M);
2182 // End of children marker.
2183 Offset += sizeof(int8_t);
2186 Die->setSize(Offset - Die->getOffset());
2190 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
2192 void DwarfDebug::computeSizeAndOffsets() {
2193 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2194 E = CUMap.end(); I != E; ++I) {
2195 // Compute size of compile unit header.
2197 sizeof(int32_t) + // Length of Compilation Unit Info
2198 sizeof(int16_t) + // DWARF version number
2199 sizeof(int32_t) + // Offset Into Abbrev. Section
2200 sizeof(int8_t); // Pointer Size (in bytes)
2201 computeSizeAndOffset(I->second->getCUDie(), Offset, true);
2205 /// EmitSectionSym - Switch to the specified MCSection and emit an assembler
2206 /// temporary label to it if SymbolStem is specified.
2207 static MCSymbol *EmitSectionSym(AsmPrinter *Asm, const MCSection *Section,
2208 const char *SymbolStem = 0) {
2209 Asm->OutStreamer.SwitchSection(Section);
2210 if (!SymbolStem) return 0;
2212 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
2213 Asm->OutStreamer.EmitLabel(TmpSym);
2217 /// EmitSectionLabels - Emit initial Dwarf sections with a label at
2218 /// the start of each one.
2219 void DwarfDebug::EmitSectionLabels() {
2220 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
2222 // Dwarf sections base addresses.
2223 DwarfInfoSectionSym =
2224 EmitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
2225 DwarfAbbrevSectionSym =
2226 EmitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
2227 EmitSectionSym(Asm, TLOF.getDwarfARangesSection());
2229 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
2230 EmitSectionSym(Asm, MacroInfo);
2232 EmitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
2233 EmitSectionSym(Asm, TLOF.getDwarfLocSection());
2234 EmitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
2235 EmitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
2236 DwarfStrSectionSym =
2237 EmitSectionSym(Asm, TLOF.getDwarfStrSection(), "section_str");
2238 DwarfDebugRangeSectionSym = EmitSectionSym(Asm, TLOF.getDwarfRangesSection(),
2241 DwarfDebugLocSectionSym = EmitSectionSym(Asm, TLOF.getDwarfLocSection(),
2242 "section_debug_loc");
2244 TextSectionSym = EmitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
2245 EmitSectionSym(Asm, TLOF.getDataSection());
2248 /// emitDIE - Recusively Emits a debug information entry.
2250 void DwarfDebug::emitDIE(DIE *Die) {
2251 // Get the abbreviation for this DIE.
2252 unsigned AbbrevNumber = Die->getAbbrevNumber();
2253 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2255 // Emit the code (index) for the abbreviation.
2256 if (Asm->isVerbose())
2257 Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
2258 Twine::utohexstr(Die->getOffset()) + ":0x" +
2259 Twine::utohexstr(Die->getSize()) + " " +
2260 dwarf::TagString(Abbrev->getTag()));
2261 Asm->EmitULEB128(AbbrevNumber);
2263 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2264 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2266 // Emit the DIE attribute values.
2267 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2268 unsigned Attr = AbbrevData[i].getAttribute();
2269 unsigned Form = AbbrevData[i].getForm();
2270 assert(Form && "Too many attributes for DIE (check abbreviation)");
2272 if (Asm->isVerbose())
2273 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
2276 case dwarf::DW_AT_sibling:
2277 Asm->EmitInt32(Die->getSiblingOffset());
2279 case dwarf::DW_AT_abstract_origin: {
2280 DIEEntry *E = cast<DIEEntry>(Values[i]);
2281 DIE *Origin = E->getEntry();
2282 unsigned Addr = Origin->getOffset();
2283 Asm->EmitInt32(Addr);
2286 case dwarf::DW_AT_ranges: {
2287 // DW_AT_range Value encodes offset in debug_range section.
2288 DIEInteger *V = cast<DIEInteger>(Values[i]);
2290 if (Asm->MAI->doesDwarfUsesLabelOffsetForRanges()) {
2291 Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym,
2295 Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
2297 DwarfDebugRangeSectionSym,
2302 case dwarf::DW_AT_location: {
2303 if (UseDotDebugLocEntry.count(Die) != 0) {
2304 DIELabel *L = cast<DIELabel>(Values[i]);
2305 Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
2307 Values[i]->EmitValue(Asm, Form);
2310 case dwarf::DW_AT_accessibility: {
2311 if (Asm->isVerbose()) {
2312 DIEInteger *V = cast<DIEInteger>(Values[i]);
2313 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
2315 Values[i]->EmitValue(Asm, Form);
2319 // Emit an attribute using the defined form.
2320 Values[i]->EmitValue(Asm, Form);
2325 // Emit the DIE children if any.
2326 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
2327 const std::vector<DIE *> &Children = Die->getChildren();
2329 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2330 emitDIE(Children[j]);
2332 if (Asm->isVerbose())
2333 Asm->OutStreamer.AddComment("End Of Children Mark");
2338 /// emitDebugInfo - Emit the debug info section.
2340 void DwarfDebug::emitDebugInfo() {
2341 // Start debug info section.
2342 Asm->OutStreamer.SwitchSection(
2343 Asm->getObjFileLowering().getDwarfInfoSection());
2344 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2345 E = CUMap.end(); I != E; ++I) {
2346 CompileUnit *TheCU = I->second;
2347 DIE *Die = TheCU->getCUDie();
2349 // Emit the compile units header.
2350 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_begin",
2353 // Emit size of content not including length itself
2354 unsigned ContentSize = Die->getSize() +
2355 sizeof(int16_t) + // DWARF version number
2356 sizeof(int32_t) + // Offset Into Abbrev. Section
2357 sizeof(int8_t); // Pointer Size (in bytes)
2359 Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
2360 Asm->EmitInt32(ContentSize);
2361 Asm->OutStreamer.AddComment("DWARF version number");
2362 Asm->EmitInt16(dwarf::DWARF_VERSION);
2363 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
2364 Asm->EmitSectionOffset(Asm->GetTempSymbol("abbrev_begin"),
2365 DwarfAbbrevSectionSym);
2366 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2367 Asm->EmitInt8(Asm->getTargetData().getPointerSize());
2370 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_end", TheCU->getID()));
2374 /// emitAbbreviations - Emit the abbreviation section.
2376 void DwarfDebug::emitAbbreviations() const {
2377 // Check to see if it is worth the effort.
2378 if (!Abbreviations.empty()) {
2379 // Start the debug abbrev section.
2380 Asm->OutStreamer.SwitchSection(
2381 Asm->getObjFileLowering().getDwarfAbbrevSection());
2383 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_begin"));
2385 // For each abbrevation.
2386 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
2387 // Get abbreviation data
2388 const DIEAbbrev *Abbrev = Abbreviations[i];
2390 // Emit the abbrevations code (base 1 index.)
2391 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
2393 // Emit the abbreviations data.
2397 // Mark end of abbreviations.
2398 Asm->EmitULEB128(0, "EOM(3)");
2400 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_end"));
2404 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
2405 /// the line matrix.
2407 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
2408 // Define last address of section.
2409 Asm->OutStreamer.AddComment("Extended Op");
2412 Asm->OutStreamer.AddComment("Op size");
2413 Asm->EmitInt8(Asm->getTargetData().getPointerSize() + 1);
2414 Asm->OutStreamer.AddComment("DW_LNE_set_address");
2415 Asm->EmitInt8(dwarf::DW_LNE_set_address);
2417 Asm->OutStreamer.AddComment("Section end label");
2419 Asm->OutStreamer.EmitSymbolValue(Asm->GetTempSymbol("section_end",SectionEnd),
2420 Asm->getTargetData().getPointerSize(),
2423 // Mark end of matrix.
2424 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
2430 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
2432 void DwarfDebug::emitDebugPubNames() {
2433 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2434 E = CUMap.end(); I != E; ++I) {
2435 CompileUnit *TheCU = I->second;
2436 // Start the dwarf pubnames section.
2437 Asm->OutStreamer.SwitchSection(
2438 Asm->getObjFileLowering().getDwarfPubNamesSection());
2440 Asm->OutStreamer.AddComment("Length of Public Names Info");
2441 Asm->EmitLabelDifference(
2442 Asm->GetTempSymbol("pubnames_end", TheCU->getID()),
2443 Asm->GetTempSymbol("pubnames_begin", TheCU->getID()), 4);
2445 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin",
2448 Asm->OutStreamer.AddComment("DWARF Version");
2449 Asm->EmitInt16(dwarf::DWARF_VERSION);
2451 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2452 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
2453 DwarfInfoSectionSym);
2455 Asm->OutStreamer.AddComment("Compilation Unit Length");
2456 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
2457 Asm->GetTempSymbol("info_begin", TheCU->getID()),
2460 const StringMap<DIE*> &Globals = TheCU->getGlobals();
2461 for (StringMap<DIE*>::const_iterator
2462 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2463 const char *Name = GI->getKeyData();
2464 DIE *Entity = GI->second;
2466 Asm->OutStreamer.AddComment("DIE offset");
2467 Asm->EmitInt32(Entity->getOffset());
2469 if (Asm->isVerbose())
2470 Asm->OutStreamer.AddComment("External Name");
2471 Asm->OutStreamer.EmitBytes(StringRef(Name, strlen(Name)+1), 0);
2474 Asm->OutStreamer.AddComment("End Mark");
2476 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_end",
2481 void DwarfDebug::emitDebugPubTypes() {
2482 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2483 E = CUMap.end(); I != E; ++I) {
2484 CompileUnit *TheCU = I->second;
2485 // Start the dwarf pubnames section.
2486 Asm->OutStreamer.SwitchSection(
2487 Asm->getObjFileLowering().getDwarfPubTypesSection());
2488 Asm->OutStreamer.AddComment("Length of Public Types Info");
2489 Asm->EmitLabelDifference(
2490 Asm->GetTempSymbol("pubtypes_end", TheCU->getID()),
2491 Asm->GetTempSymbol("pubtypes_begin", TheCU->getID()), 4);
2493 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_begin",
2496 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DWARF Version");
2497 Asm->EmitInt16(dwarf::DWARF_VERSION);
2499 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2500 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
2501 DwarfInfoSectionSym);
2503 Asm->OutStreamer.AddComment("Compilation Unit Length");
2504 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
2505 Asm->GetTempSymbol("info_begin", TheCU->getID()),
2508 const StringMap<DIE*> &Globals = TheCU->getGlobalTypes();
2509 for (StringMap<DIE*>::const_iterator
2510 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2511 const char *Name = GI->getKeyData();
2512 DIE * Entity = GI->second;
2514 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2515 Asm->EmitInt32(Entity->getOffset());
2517 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("External Name");
2518 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1), 0);
2521 Asm->OutStreamer.AddComment("End Mark");
2523 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_end",
2528 /// emitDebugStr - Emit visible names into a debug str section.
2530 void DwarfDebug::emitDebugStr() {
2531 // Check to see if it is worth the effort.
2532 if (StringPool.empty()) return;
2534 // Start the dwarf str section.
2535 Asm->OutStreamer.SwitchSection(
2536 Asm->getObjFileLowering().getDwarfStrSection());
2538 // Get all of the string pool entries and put them in an array by their ID so
2539 // we can sort them.
2540 SmallVector<std::pair<unsigned,
2541 StringMapEntry<std::pair<MCSymbol*, unsigned> >*>, 64> Entries;
2543 for (StringMap<std::pair<MCSymbol*, unsigned> >::iterator
2544 I = StringPool.begin(), E = StringPool.end(); I != E; ++I)
2545 Entries.push_back(std::make_pair(I->second.second, &*I));
2547 array_pod_sort(Entries.begin(), Entries.end());
2549 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2550 // Emit a label for reference from debug information entries.
2551 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
2553 // Emit the string itself.
2554 Asm->OutStreamer.EmitBytes(Entries[i].second->getKey(), 0/*addrspace*/);
2558 /// emitDebugLoc - Emit visible names into a debug loc section.
2560 void DwarfDebug::emitDebugLoc() {
2561 if (DotDebugLocEntries.empty())
2564 for (SmallVector<DotDebugLocEntry, 4>::iterator
2565 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2567 DotDebugLocEntry &Entry = *I;
2568 if (I + 1 != DotDebugLocEntries.end())
2572 // Start the dwarf loc section.
2573 Asm->OutStreamer.SwitchSection(
2574 Asm->getObjFileLowering().getDwarfLocSection());
2575 unsigned char Size = Asm->getTargetData().getPointerSize();
2576 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
2578 for (SmallVector<DotDebugLocEntry, 4>::iterator
2579 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2580 I != E; ++I, ++index) {
2581 DotDebugLocEntry &Entry = *I;
2582 if (Entry.isMerged()) continue;
2583 if (Entry.isEmpty()) {
2584 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2585 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2586 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
2588 Asm->OutStreamer.EmitSymbolValue(Entry.Begin, Size, 0);
2589 Asm->OutStreamer.EmitSymbolValue(Entry.End, Size, 0);
2590 DIVariable DV(Entry.Variable);
2591 Asm->OutStreamer.AddComment("Loc expr size");
2592 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
2593 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
2594 Asm->EmitLabelDifference(end, begin, 2);
2595 Asm->OutStreamer.EmitLabel(begin);
2596 if (Entry.isInt()) {
2597 DIBasicType BTy(DV.getType());
2599 (BTy.getEncoding() == dwarf::DW_ATE_signed
2600 || BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
2601 Asm->OutStreamer.AddComment("DW_OP_consts");
2602 Asm->EmitInt8(dwarf::DW_OP_consts);
2603 Asm->EmitSLEB128(Entry.getInt());
2605 Asm->OutStreamer.AddComment("DW_OP_constu");
2606 Asm->EmitInt8(dwarf::DW_OP_constu);
2607 Asm->EmitULEB128(Entry.getInt());
2609 } else if (Entry.isLocation()) {
2610 if (!DV.hasComplexAddress())
2612 Asm->EmitDwarfRegOp(Entry.Loc);
2614 // Complex address entry.
2615 unsigned N = DV.getNumAddrElements();
2617 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
2618 if (Entry.Loc.getOffset()) {
2620 Asm->EmitDwarfRegOp(Entry.Loc);
2621 Asm->OutStreamer.AddComment("DW_OP_deref");
2622 Asm->EmitInt8(dwarf::DW_OP_deref);
2623 Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
2624 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2625 Asm->EmitSLEB128(DV.getAddrElement(1));
2627 // If first address element is OpPlus then emit
2628 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
2629 MachineLocation Loc(Entry.Loc.getReg(), DV.getAddrElement(1));
2630 Asm->EmitDwarfRegOp(Loc);
2634 Asm->EmitDwarfRegOp(Entry.Loc);
2637 // Emit remaining complex address elements.
2638 for (; i < N; ++i) {
2639 uint64_t Element = DV.getAddrElement(i);
2640 if (Element == DIBuilder::OpPlus) {
2641 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2642 Asm->EmitULEB128(DV.getAddrElement(++i));
2643 } else if (Element == DIBuilder::OpDeref)
2644 Asm->EmitInt8(dwarf::DW_OP_deref);
2645 else llvm_unreachable("unknown Opcode found in complex address");
2649 // else ... ignore constant fp. There is not any good way to
2650 // to represent them here in dwarf.
2651 Asm->OutStreamer.EmitLabel(end);
2656 /// EmitDebugARanges - Emit visible names into a debug aranges section.
2658 void DwarfDebug::EmitDebugARanges() {
2659 // Start the dwarf aranges section.
2660 Asm->OutStreamer.SwitchSection(
2661 Asm->getObjFileLowering().getDwarfARangesSection());
2664 /// emitDebugRanges - Emit visible names into a debug ranges section.
2666 void DwarfDebug::emitDebugRanges() {
2667 // Start the dwarf ranges section.
2668 Asm->OutStreamer.SwitchSection(
2669 Asm->getObjFileLowering().getDwarfRangesSection());
2670 unsigned char Size = Asm->getTargetData().getPointerSize();
2671 for (SmallVector<const MCSymbol *, 8>::iterator
2672 I = DebugRangeSymbols.begin(), E = DebugRangeSymbols.end();
2675 Asm->OutStreamer.EmitSymbolValue(const_cast<MCSymbol*>(*I), Size, 0);
2677 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2681 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
2683 void DwarfDebug::emitDebugMacInfo() {
2684 if (const MCSection *LineInfo =
2685 Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
2686 // Start the dwarf macinfo section.
2687 Asm->OutStreamer.SwitchSection(LineInfo);
2691 /// emitDebugInlineInfo - Emit inline info using following format.
2693 /// 1. length of section
2694 /// 2. Dwarf version number
2695 /// 3. address size.
2697 /// Entries (one "entry" for each function that was inlined):
2699 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
2700 /// otherwise offset into __debug_str for regular function name.
2701 /// 2. offset into __debug_str section for regular function name.
2702 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
2703 /// instances for the function.
2705 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
2706 /// inlined instance; the die_offset points to the inlined_subroutine die in the
2707 /// __debug_info section, and the low_pc is the starting address for the
2708 /// inlining instance.
2709 void DwarfDebug::emitDebugInlineInfo() {
2710 if (!Asm->MAI->doesDwarfUsesInlineInfoSection())
2716 Asm->OutStreamer.SwitchSection(
2717 Asm->getObjFileLowering().getDwarfDebugInlineSection());
2719 Asm->OutStreamer.AddComment("Length of Debug Inlined Information Entry");
2720 Asm->EmitLabelDifference(Asm->GetTempSymbol("debug_inlined_end", 1),
2721 Asm->GetTempSymbol("debug_inlined_begin", 1), 4);
2723 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_begin", 1));
2725 Asm->OutStreamer.AddComment("Dwarf Version");
2726 Asm->EmitInt16(dwarf::DWARF_VERSION);
2727 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2728 Asm->EmitInt8(Asm->getTargetData().getPointerSize());
2730 for (SmallVector<const MDNode *, 4>::iterator I = InlinedSPNodes.begin(),
2731 E = InlinedSPNodes.end(); I != E; ++I) {
2733 const MDNode *Node = *I;
2734 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator II
2735 = InlineInfo.find(Node);
2736 SmallVector<InlineInfoLabels, 4> &Labels = II->second;
2737 DISubprogram SP(Node);
2738 StringRef LName = SP.getLinkageName();
2739 StringRef Name = SP.getName();
2741 Asm->OutStreamer.AddComment("MIPS linkage name");
2742 if (LName.empty()) {
2743 Asm->OutStreamer.EmitBytes(Name, 0);
2744 Asm->OutStreamer.EmitIntValue(0, 1, 0); // nul terminator.
2746 Asm->EmitSectionOffset(getStringPoolEntry(getRealLinkageName(LName)),
2747 DwarfStrSectionSym);
2749 Asm->OutStreamer.AddComment("Function name");
2750 Asm->EmitSectionOffset(getStringPoolEntry(Name), DwarfStrSectionSym);
2751 Asm->EmitULEB128(Labels.size(), "Inline count");
2753 for (SmallVector<InlineInfoLabels, 4>::iterator LI = Labels.begin(),
2754 LE = Labels.end(); LI != LE; ++LI) {
2755 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2756 Asm->EmitInt32(LI->second->getOffset());
2758 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("low_pc");
2759 Asm->OutStreamer.EmitSymbolValue(LI->first,
2760 Asm->getTargetData().getPointerSize(),0);
2764 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_end", 1));