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 /// collectVariableInfo - Populate DbgScope entries with variables' info.
1360 DwarfDebug::collectVariableInfo(const MachineFunction *MF,
1361 SmallPtrSet<const MDNode *, 16> &Processed) {
1363 /// collection info from MMI table.
1364 collectVariableInfoFromMMITable(MF, Processed);
1366 for (SmallVectorImpl<const MDNode*>::const_iterator
1367 UVI = UserVariables.begin(), UVE = UserVariables.end(); UVI != UVE;
1369 const MDNode *Var = *UVI;
1370 if (Processed.count(Var))
1373 // History contains relevant DBG_VALUE instructions for Var and instructions
1375 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1376 if (History.empty())
1378 const MachineInstr *MInsn = History.front();
1381 DbgScope *Scope = NULL;
1382 if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
1383 DISubprogram(DV.getContext()).describes(MF->getFunction()))
1384 Scope = CurrentFnDbgScope;
1386 Scope = findDbgScope(MInsn);
1387 // If variable scope is not found then skip this variable.
1391 Processed.insert(DV);
1392 assert(MInsn->isDebugValue() && "History must begin with debug value");
1393 DbgVariable *RegVar = new DbgVariable(DV);
1394 if (!addCurrentFnArgument(MF, RegVar, Scope))
1395 Scope->addVariable(RegVar);
1396 if (DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc())) {
1397 DbgVariableToDbgInstMap[AbsVar] = MInsn;
1398 VarToAbstractVarMap[RegVar] = AbsVar;
1401 // Simple ranges that are fully coalesced.
1402 if (History.size() <= 1 || (History.size() == 2 &&
1403 MInsn->isIdenticalTo(History.back()))) {
1404 DbgVariableToDbgInstMap[RegVar] = MInsn;
1408 // handle multiple DBG_VALUE instructions describing one variable.
1409 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
1411 for (SmallVectorImpl<const MachineInstr*>::const_iterator
1412 HI = History.begin(), HE = History.end(); HI != HE; ++HI) {
1413 const MachineInstr *Begin = *HI;
1414 assert(Begin->isDebugValue() && "Invalid History entry");
1416 // Check if DBG_VALUE is truncating a range.
1417 if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg()
1418 && !Begin->getOperand(0).getReg())
1421 // Compute the range for a register location.
1422 const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
1423 const MCSymbol *SLabel = 0;
1426 // If Begin is the last instruction in History then its value is valid
1427 // until the end of the function.
1428 SLabel = FunctionEndSym;
1430 const MachineInstr *End = HI[1];
1431 DEBUG(dbgs() << "DotDebugLoc Pair:\n"
1432 << "\t" << *Begin << "\t" << *End << "\n");
1433 if (End->isDebugValue())
1434 SLabel = getLabelBeforeInsn(End);
1436 // End is a normal instruction clobbering the range.
1437 SLabel = getLabelAfterInsn(End);
1438 assert(SLabel && "Forgot label after clobber instruction");
1443 // The value is valid until the next DBG_VALUE or clobber.
1444 MachineLocation MLoc;
1445 if (Begin->getNumOperands() == 3) {
1446 if (Begin->getOperand(0).isReg() && Begin->getOperand(1).isImm()) {
1447 MLoc.set(Begin->getOperand(0).getReg(),
1448 Begin->getOperand(1).getImm());
1450 push_back(DotDebugLocEntry(FLabel, SLabel, MLoc, Var));
1452 else if (Begin->getOperand(0).isImm()) {
1454 push_back(DotDebugLocEntry(FLabel, SLabel,
1455 Begin->getOperand(0).getImm()));
1456 } else if (Begin->getOperand(0).isFPImm()) {
1458 push_back(DotDebugLocEntry(FLabel, SLabel,
1459 Begin->getOperand(0).getFPImm()));
1460 } else if (Begin->getOperand(0).isCImm()) {
1462 push_back(DotDebugLocEntry(FLabel, SLabel,
1463 Begin->getOperand(0).getCImm()));
1465 assert (0 && "Unexpected 3 operand DBG_VALUE instruction!");
1468 MLoc = Asm->getDebugValueLocation(Begin);
1470 push_back(DotDebugLocEntry(FLabel, SLabel, MLoc, Var));
1473 DotDebugLocEntries.push_back(DotDebugLocEntry());
1476 // Collect info for variables that were optimized out.
1477 const Function *F = MF->getFunction();
1478 if (NamedMDNode *NMD = getFnSpecificMDNode(*(F->getParent()), F->getName())) {
1479 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1480 DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
1481 if (!DV || !Processed.insert(DV))
1483 DbgScope *Scope = DbgScopeMap.lookup(DV.getContext());
1485 Scope->addVariable(new DbgVariable(DV));
1490 /// getLabelBeforeInsn - Return Label preceding the instruction.
1491 const MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1492 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1493 assert(Label && "Didn't insert label before instruction");
1497 /// getLabelAfterInsn - Return Label immediately following the instruction.
1498 const MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1499 return LabelsAfterInsn.lookup(MI);
1502 /// beginInstruction - Process beginning of an instruction.
1503 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1504 // Check if source location changes, but ignore DBG_VALUE locations.
1505 if (!MI->isDebugValue()) {
1506 DebugLoc DL = MI->getDebugLoc();
1507 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1508 unsigned Flags = DWARF2_FLAG_IS_STMT;
1510 if (DL == PrologEndLoc) {
1511 Flags |= DWARF2_FLAG_PROLOGUE_END;
1512 PrologEndLoc = DebugLoc();
1514 if (!DL.isUnknown()) {
1515 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1516 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1518 recordSourceLine(0, 0, 0, 0);
1522 // Insert labels where requested.
1523 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1524 LabelsBeforeInsn.find(MI);
1527 if (I == LabelsBeforeInsn.end())
1530 // Label already assigned.
1535 PrevLabel = MMI->getContext().CreateTempSymbol();
1536 Asm->OutStreamer.EmitLabel(PrevLabel);
1538 I->second = PrevLabel;
1541 /// endInstruction - Process end of an instruction.
1542 void DwarfDebug::endInstruction(const MachineInstr *MI) {
1543 // Don't create a new label after DBG_VALUE instructions.
1544 // They don't generate code.
1545 if (!MI->isDebugValue())
1548 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1549 LabelsAfterInsn.find(MI);
1552 if (I == LabelsAfterInsn.end())
1555 // Label already assigned.
1559 // We need a label after this instruction.
1561 PrevLabel = MMI->getContext().CreateTempSymbol();
1562 Asm->OutStreamer.EmitLabel(PrevLabel);
1564 I->second = PrevLabel;
1567 /// getOrCreateDbgScope - Create DbgScope for the scope.
1568 DbgScope *DwarfDebug::getOrCreateDbgScope(const MDNode *Scope,
1569 const MDNode *InlinedAt) {
1571 DbgScope *WScope = DbgScopeMap.lookup(Scope);
1574 WScope = new DbgScope(NULL, DIDescriptor(Scope), NULL);
1575 DbgScopeMap.insert(std::make_pair(Scope, WScope));
1576 if (DIDescriptor(Scope).isLexicalBlock()) {
1578 getOrCreateDbgScope(DILexicalBlock(Scope).getContext(), NULL);
1579 WScope->setParent(Parent);
1580 Parent->addScope(WScope);
1583 if (!WScope->getParent()) {
1584 StringRef SPName = DISubprogram(Scope).getLinkageName();
1585 // We used to check only for a linkage name, but that fails
1586 // since we began omitting the linkage name for private
1587 // functions. The new way is to check for the name in metadata,
1588 // but that's not supported in old .ll test cases. Ergo, we
1590 if (SPName == Asm->MF->getFunction()->getName() ||
1591 DISubprogram(Scope).getFunction() == Asm->MF->getFunction())
1592 CurrentFnDbgScope = WScope;
1598 getOrCreateAbstractScope(Scope);
1599 DbgScope *WScope = DbgScopeMap.lookup(InlinedAt);
1603 WScope = new DbgScope(NULL, DIDescriptor(Scope), InlinedAt);
1604 DbgScopeMap.insert(std::make_pair(InlinedAt, WScope));
1605 DILocation DL(InlinedAt);
1607 getOrCreateDbgScope(DL.getScope(), DL.getOrigLocation());
1608 WScope->setParent(Parent);
1609 Parent->addScope(WScope);
1611 ConcreteScopes[InlinedAt] = WScope;
1616 /// hasValidLocation - Return true if debug location entry attached with
1617 /// machine instruction encodes valid location info.
1618 static bool hasValidLocation(LLVMContext &Ctx,
1619 const MachineInstr *MInsn,
1620 const MDNode *&Scope, const MDNode *&InlinedAt) {
1621 DebugLoc DL = MInsn->getDebugLoc();
1622 if (DL.isUnknown()) return false;
1624 const MDNode *S = DL.getScope(Ctx);
1626 // There is no need to create another DIE for compile unit. For all
1627 // other scopes, create one DbgScope now. This will be translated
1628 // into a scope DIE at the end.
1629 if (DIScope(S).isCompileUnit()) return false;
1632 InlinedAt = DL.getInlinedAt(Ctx);
1636 /// calculateDominanceGraph - Calculate dominance graph for DbgScope
1638 static void calculateDominanceGraph(DbgScope *Scope) {
1639 assert (Scope && "Unable to calculate scop edominance graph!");
1640 SmallVector<DbgScope *, 4> WorkStack;
1641 WorkStack.push_back(Scope);
1642 unsigned Counter = 0;
1643 while (!WorkStack.empty()) {
1644 DbgScope *WS = WorkStack.back();
1645 const SmallVector<DbgScope *, 4> &Children = WS->getScopes();
1646 bool visitedChildren = false;
1647 for (SmallVector<DbgScope *, 4>::const_iterator SI = Children.begin(),
1648 SE = Children.end(); SI != SE; ++SI) {
1649 DbgScope *ChildScope = *SI;
1650 if (!ChildScope->getDFSOut()) {
1651 WorkStack.push_back(ChildScope);
1652 visitedChildren = true;
1653 ChildScope->setDFSIn(++Counter);
1657 if (!visitedChildren) {
1658 WorkStack.pop_back();
1659 WS->setDFSOut(++Counter);
1664 /// printDbgScopeInfo - Print DbgScope info for each machine instruction.
1666 void printDbgScopeInfo(LLVMContext &Ctx, const MachineFunction *MF,
1667 DenseMap<const MachineInstr *, DbgScope *> &MI2ScopeMap)
1670 unsigned PrevDFSIn = 0;
1671 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1673 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1675 const MachineInstr *MInsn = II;
1676 const MDNode *Scope = NULL;
1677 const MDNode *InlinedAt = NULL;
1679 // Check if instruction has valid location information.
1680 if (hasValidLocation(Ctx, MInsn, Scope, InlinedAt)) {
1684 DenseMap<const MachineInstr *, DbgScope *>::iterator DI =
1685 MI2ScopeMap.find(MInsn);
1686 if (DI != MI2ScopeMap.end()) {
1687 DbgScope *S = DI->second;
1688 dbgs() << S->getDFSIn();
1689 PrevDFSIn = S->getDFSIn();
1691 dbgs() << PrevDFSIn;
1693 dbgs() << " [ x" << PrevDFSIn;
1701 /// extractScopeInformation - Scan machine instructions in this function
1702 /// and collect DbgScopes. Return true, if at least one scope was found.
1703 bool DwarfDebug::extractScopeInformation() {
1704 // If scope information was extracted using .dbg intrinsics then there is not
1705 // any need to extract these information by scanning each instruction.
1706 if (!DbgScopeMap.empty())
1709 // Scan each instruction and create scopes. First build working set of scopes.
1710 LLVMContext &Ctx = Asm->MF->getFunction()->getContext();
1711 SmallVector<DbgRange, 4> MIRanges;
1712 DenseMap<const MachineInstr *, DbgScope *> MI2ScopeMap;
1713 const MDNode *PrevScope = NULL;
1714 const MDNode *PrevInlinedAt = NULL;
1715 const MachineInstr *RangeBeginMI = NULL;
1716 const MachineInstr *PrevMI = NULL;
1717 for (MachineFunction::const_iterator I = Asm->MF->begin(), E = Asm->MF->end();
1719 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1721 const MachineInstr *MInsn = II;
1722 const MDNode *Scope = NULL;
1723 const MDNode *InlinedAt = NULL;
1725 // Check if instruction has valid location information.
1726 if (!hasValidLocation(Ctx, MInsn, Scope, InlinedAt)) {
1731 // If scope has not changed then skip this instruction.
1732 if (Scope == PrevScope && PrevInlinedAt == InlinedAt) {
1737 // Ignore DBG_VALUE. It does not contribute any instruction in output.
1738 if (MInsn->isDebugValue())
1742 // If we have alread seen a beginning of a instruction range and
1743 // current instruction scope does not match scope of first instruction
1744 // in this range then create a new instruction range.
1745 DbgRange R(RangeBeginMI, PrevMI);
1746 MI2ScopeMap[RangeBeginMI] = getOrCreateDbgScope(PrevScope,
1748 MIRanges.push_back(R);
1751 // This is a beginning of a new instruction range.
1752 RangeBeginMI = MInsn;
1754 // Reset previous markers.
1757 PrevInlinedAt = InlinedAt;
1761 // Create last instruction range.
1762 if (RangeBeginMI && PrevMI && PrevScope) {
1763 DbgRange R(RangeBeginMI, PrevMI);
1764 MIRanges.push_back(R);
1765 MI2ScopeMap[RangeBeginMI] = getOrCreateDbgScope(PrevScope, PrevInlinedAt);
1768 if (!CurrentFnDbgScope)
1771 calculateDominanceGraph(CurrentFnDbgScope);
1773 printDbgScopeInfo(Ctx, Asm->MF, MI2ScopeMap);
1775 // Find ranges of instructions covered by each DbgScope;
1776 DbgScope *PrevDbgScope = NULL;
1777 for (SmallVector<DbgRange, 4>::const_iterator RI = MIRanges.begin(),
1778 RE = MIRanges.end(); RI != RE; ++RI) {
1779 const DbgRange &R = *RI;
1780 DbgScope *S = MI2ScopeMap.lookup(R.first);
1781 assert (S && "Lost DbgScope for a machine instruction!");
1782 if (PrevDbgScope && !PrevDbgScope->dominates(S))
1783 PrevDbgScope->closeInsnRange(S);
1784 S->openInsnRange(R.first);
1785 S->extendInsnRange(R.second);
1790 PrevDbgScope->closeInsnRange();
1792 identifyScopeMarkers();
1794 return !DbgScopeMap.empty();
1797 /// identifyScopeMarkers() -
1798 /// Each DbgScope has first instruction and last instruction to mark beginning
1799 /// and end of a scope respectively. Create an inverse map that list scopes
1800 /// starts (and ends) with an instruction. One instruction may start (or end)
1801 /// multiple scopes. Ignore scopes that are not reachable.
1802 void DwarfDebug::identifyScopeMarkers() {
1803 SmallVector<DbgScope *, 4> WorkList;
1804 WorkList.push_back(CurrentFnDbgScope);
1805 while (!WorkList.empty()) {
1806 DbgScope *S = WorkList.pop_back_val();
1808 const SmallVector<DbgScope *, 4> &Children = S->getScopes();
1809 if (!Children.empty())
1810 for (SmallVector<DbgScope *, 4>::const_iterator SI = Children.begin(),
1811 SE = Children.end(); SI != SE; ++SI)
1812 WorkList.push_back(*SI);
1814 if (S->isAbstractScope())
1817 const SmallVector<DbgRange, 4> &Ranges = S->getRanges();
1820 for (SmallVector<DbgRange, 4>::const_iterator RI = Ranges.begin(),
1821 RE = Ranges.end(); RI != RE; ++RI) {
1822 assert(RI->first && "DbgRange does not have first instruction!");
1823 assert(RI->second && "DbgRange does not have second instruction!");
1824 requestLabelBeforeInsn(RI->first);
1825 requestLabelAfterInsn(RI->second);
1830 /// getScopeNode - Get MDNode for DebugLoc's scope.
1831 static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
1832 if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
1833 return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
1834 return DL.getScope(Ctx);
1837 /// getFnDebugLoc - Walk up the scope chain of given debug loc and find
1838 /// line number info for the function.
1839 static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
1840 const MDNode *Scope = getScopeNode(DL, Ctx);
1841 DISubprogram SP = getDISubprogram(Scope);
1843 return DebugLoc::get(SP.getLineNumber(), 0, SP);
1847 /// beginFunction - Gather pre-function debug information. Assumes being
1848 /// emitted immediately after the function entry point.
1849 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1850 if (!MMI->hasDebugInfo()) return;
1851 if (!extractScopeInformation()) return;
1853 FunctionBeginSym = Asm->GetTempSymbol("func_begin",
1854 Asm->getFunctionNumber());
1855 // Assumes in correct section after the entry point.
1856 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1858 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
1860 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1861 /// LiveUserVar - Map physreg numbers to the MDNode they contain.
1862 std::vector<const MDNode*> LiveUserVar(TRI->getNumRegs());
1864 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1866 bool AtBlockEntry = true;
1867 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1869 const MachineInstr *MI = II;
1871 if (MI->isDebugValue()) {
1872 assert (MI->getNumOperands() > 1 && "Invalid machine instruction!");
1874 // Keep track of user variables.
1876 MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1878 // Variable is in a register, we need to check for clobbers.
1879 if (isDbgValueInDefinedReg(MI))
1880 LiveUserVar[MI->getOperand(0).getReg()] = Var;
1882 // Check the history of this variable.
1883 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1884 if (History.empty()) {
1885 UserVariables.push_back(Var);
1886 // The first mention of a function argument gets the FunctionBeginSym
1887 // label, so arguments are visible when breaking at function entry.
1889 if (DV.Verify() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
1890 DISubprogram(getDISubprogram(DV.getContext()))
1891 .describes(MF->getFunction()))
1892 LabelsBeforeInsn[MI] = FunctionBeginSym;
1894 // We have seen this variable before. Try to coalesce DBG_VALUEs.
1895 const MachineInstr *Prev = History.back();
1896 if (Prev->isDebugValue()) {
1897 // Coalesce identical entries at the end of History.
1898 if (History.size() >= 2 &&
1899 Prev->isIdenticalTo(History[History.size() - 2])) {
1900 DEBUG(dbgs() << "Coalesce identical DBG_VALUE entries:\n"
1902 << "\t" << *History[History.size() - 2] << "\n");
1906 // Terminate old register assignments that don't reach MI;
1907 MachineFunction::const_iterator PrevMBB = Prev->getParent();
1908 if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
1909 isDbgValueInDefinedReg(Prev)) {
1910 // Previous register assignment needs to terminate at the end of
1912 MachineBasicBlock::const_iterator LastMI =
1913 PrevMBB->getLastNonDebugInstr();
1914 if (LastMI == PrevMBB->end()) {
1915 // Drop DBG_VALUE for empty range.
1916 DEBUG(dbgs() << "Drop DBG_VALUE for empty range:\n"
1917 << "\t" << *Prev << "\n");
1921 // Terminate after LastMI.
1922 History.push_back(LastMI);
1927 History.push_back(MI);
1929 // Not a DBG_VALUE instruction.
1931 AtBlockEntry = false;
1933 // First known non DBG_VALUE location marks beginning of function
1935 if (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown())
1936 PrologEndLoc = MI->getDebugLoc();
1938 // Check if the instruction clobbers any registers with debug vars.
1939 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
1940 MOE = MI->operands_end(); MOI != MOE; ++MOI) {
1941 if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
1943 for (const unsigned *AI = TRI->getOverlaps(MOI->getReg());
1944 unsigned Reg = *AI; ++AI) {
1945 const MDNode *Var = LiveUserVar[Reg];
1948 // Reg is now clobbered.
1949 LiveUserVar[Reg] = 0;
1951 // Was MD last defined by a DBG_VALUE referring to Reg?
1952 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
1953 if (HistI == DbgValues.end())
1955 SmallVectorImpl<const MachineInstr*> &History = HistI->second;
1956 if (History.empty())
1958 const MachineInstr *Prev = History.back();
1959 // Sanity-check: Register assignments are terminated at the end of
1961 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
1963 // Is the variable still in Reg?
1964 if (!isDbgValueInDefinedReg(Prev) ||
1965 Prev->getOperand(0).getReg() != Reg)
1967 // Var is clobbered. Make sure the next instruction gets a label.
1968 History.push_back(MI);
1975 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
1977 SmallVectorImpl<const MachineInstr*> &History = I->second;
1978 if (History.empty())
1981 // Make sure the final register assignments are terminated.
1982 const MachineInstr *Prev = History.back();
1983 if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
1984 const MachineBasicBlock *PrevMBB = Prev->getParent();
1985 MachineBasicBlock::const_iterator LastMI = PrevMBB->getLastNonDebugInstr();
1986 if (LastMI == PrevMBB->end())
1987 // Drop DBG_VALUE for empty range.
1990 // Terminate after LastMI.
1991 History.push_back(LastMI);
1994 // Request labels for the full history.
1995 for (unsigned i = 0, e = History.size(); i != e; ++i) {
1996 const MachineInstr *MI = History[i];
1997 if (MI->isDebugValue())
1998 requestLabelBeforeInsn(MI);
2000 requestLabelAfterInsn(MI);
2004 PrevInstLoc = DebugLoc();
2005 PrevLabel = FunctionBeginSym;
2007 // Record beginning of function.
2008 if (!PrologEndLoc.isUnknown()) {
2009 DebugLoc FnStartDL = getFnDebugLoc(PrologEndLoc,
2010 MF->getFunction()->getContext());
2011 recordSourceLine(FnStartDL.getLine(), FnStartDL.getCol(),
2012 FnStartDL.getScope(MF->getFunction()->getContext()),
2013 DWARF2_FLAG_IS_STMT);
2017 /// endFunction - Gather and emit post-function debug information.
2019 void DwarfDebug::endFunction(const MachineFunction *MF) {
2020 if (!MMI->hasDebugInfo() || DbgScopeMap.empty()) return;
2022 if (CurrentFnDbgScope) {
2024 // Define end label for subprogram.
2025 FunctionEndSym = Asm->GetTempSymbol("func_end",
2026 Asm->getFunctionNumber());
2027 // Assumes in correct section after the entry point.
2028 Asm->OutStreamer.EmitLabel(FunctionEndSym);
2030 SmallPtrSet<const MDNode *, 16> ProcessedVars;
2031 collectVariableInfo(MF, ProcessedVars);
2033 // Construct abstract scopes.
2034 for (SmallVector<DbgScope *, 4>::iterator AI = AbstractScopesList.begin(),
2035 AE = AbstractScopesList.end(); AI != AE; ++AI) {
2036 DISubprogram SP((*AI)->getScopeNode());
2038 // Collect info for variables that were optimized out.
2039 StringRef FName = SP.getLinkageName();
2041 FName = SP.getName();
2042 if (NamedMDNode *NMD =
2043 getFnSpecificMDNode(*(MF->getFunction()->getParent()), FName)) {
2044 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2045 DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
2046 if (!DV || !ProcessedVars.insert(DV))
2048 DbgScope *Scope = AbstractScopes.lookup(DV.getContext());
2050 Scope->addVariable(new DbgVariable(DV));
2054 if (ProcessedSPNodes.count((*AI)->getScopeNode()) == 0)
2055 constructScopeDIE(*AI);
2058 DIE *CurFnDIE = constructScopeDIE(CurrentFnDbgScope);
2060 if (!DisableFramePointerElim(*MF))
2061 getCompileUnit(CurrentFnDbgScope->getScopeNode())->addUInt(CurFnDIE,
2062 dwarf::DW_AT_APPLE_omit_frame_ptr,
2063 dwarf::DW_FORM_flag, 1);
2066 DebugFrames.push_back(FunctionDebugFrameInfo(Asm->getFunctionNumber(),
2067 MMI->getFrameMoves()));
2071 CurrentFnDbgScope = NULL;
2072 DeleteContainerPointers(CurrentFnArguments);
2073 DbgVariableToFrameIndexMap.clear();
2074 VarToAbstractVarMap.clear();
2075 DbgVariableToDbgInstMap.clear();
2076 DeleteContainerSeconds(DbgScopeMap);
2077 UserVariables.clear();
2079 ConcreteScopes.clear();
2080 DeleteContainerSeconds(AbstractScopes);
2081 AbstractScopesList.clear();
2082 AbstractVariables.clear();
2083 LabelsBeforeInsn.clear();
2084 LabelsAfterInsn.clear();
2088 /// recordVariableFrameIndex - Record a variable's index.
2089 void DwarfDebug::recordVariableFrameIndex(const DbgVariable *V, int Index) {
2090 assert (V && "Invalid DbgVariable!");
2091 DbgVariableToFrameIndexMap[V] = Index;
2094 /// findVariableFrameIndex - Return true if frame index for the variable
2095 /// is found. Update FI to hold value of the index.
2096 bool DwarfDebug::findVariableFrameIndex(const DbgVariable *V, int *FI) {
2097 assert (V && "Invalid DbgVariable!");
2098 DenseMap<const DbgVariable *, int>::iterator I =
2099 DbgVariableToFrameIndexMap.find(V);
2100 if (I == DbgVariableToFrameIndexMap.end())
2106 /// findDbgScope - Find DbgScope for the debug loc attached with an
2108 DbgScope *DwarfDebug::findDbgScope(const MachineInstr *MInsn) {
2109 DbgScope *Scope = NULL;
2111 MInsn->getParent()->getParent()->getFunction()->getContext();
2112 DebugLoc DL = MInsn->getDebugLoc();
2117 if (const MDNode *IA = DL.getInlinedAt(Ctx))
2118 Scope = ConcreteScopes.lookup(IA);
2120 Scope = DbgScopeMap.lookup(DL.getScope(Ctx));
2126 /// recordSourceLine - Register a source line with debug info. Returns the
2127 /// unique label that was emitted and which provides correspondence to
2128 /// the source line list.
2129 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
2135 DIDescriptor Scope(S);
2137 if (Scope.isCompileUnit()) {
2138 DICompileUnit CU(S);
2139 Fn = CU.getFilename();
2140 Dir = CU.getDirectory();
2141 } else if (Scope.isFile()) {
2143 Fn = F.getFilename();
2144 Dir = F.getDirectory();
2145 } else if (Scope.isSubprogram()) {
2147 Fn = SP.getFilename();
2148 Dir = SP.getDirectory();
2149 } else if (Scope.isLexicalBlock()) {
2150 DILexicalBlock DB(S);
2151 Fn = DB.getFilename();
2152 Dir = DB.getDirectory();
2154 assert(0 && "Unexpected scope info");
2156 Src = GetOrCreateSourceID(Fn, Dir);
2158 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags,
2162 //===----------------------------------------------------------------------===//
2164 //===----------------------------------------------------------------------===//
2166 /// computeSizeAndOffset - Compute the size and offset of a DIE.
2169 DwarfDebug::computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last) {
2170 // Get the children.
2171 const std::vector<DIE *> &Children = Die->getChildren();
2173 // If not last sibling and has children then add sibling offset attribute.
2174 if (!Last && !Children.empty())
2175 Die->addSiblingOffset(DIEValueAllocator);
2177 // Record the abbreviation.
2178 assignAbbrevNumber(Die->getAbbrev());
2180 // Get the abbreviation for this DIE.
2181 unsigned AbbrevNumber = Die->getAbbrevNumber();
2182 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2185 Die->setOffset(Offset);
2187 // Start the size with the size of abbreviation code.
2188 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
2190 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2191 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2193 // Size the DIE attribute values.
2194 for (unsigned i = 0, N = Values.size(); i < N; ++i)
2195 // Size attribute value.
2196 Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
2198 // Size the DIE children if any.
2199 if (!Children.empty()) {
2200 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
2201 "Children flag not set");
2203 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2204 Offset = computeSizeAndOffset(Children[j], Offset, (j + 1) == M);
2206 // End of children marker.
2207 Offset += sizeof(int8_t);
2210 Die->setSize(Offset - Die->getOffset());
2214 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
2216 void DwarfDebug::computeSizeAndOffsets() {
2217 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2218 E = CUMap.end(); I != E; ++I) {
2219 // Compute size of compile unit header.
2221 sizeof(int32_t) + // Length of Compilation Unit Info
2222 sizeof(int16_t) + // DWARF version number
2223 sizeof(int32_t) + // Offset Into Abbrev. Section
2224 sizeof(int8_t); // Pointer Size (in bytes)
2225 computeSizeAndOffset(I->second->getCUDie(), Offset, true);
2229 /// EmitSectionSym - Switch to the specified MCSection and emit an assembler
2230 /// temporary label to it if SymbolStem is specified.
2231 static MCSymbol *EmitSectionSym(AsmPrinter *Asm, const MCSection *Section,
2232 const char *SymbolStem = 0) {
2233 Asm->OutStreamer.SwitchSection(Section);
2234 if (!SymbolStem) return 0;
2236 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
2237 Asm->OutStreamer.EmitLabel(TmpSym);
2241 /// EmitSectionLabels - Emit initial Dwarf sections with a label at
2242 /// the start of each one.
2243 void DwarfDebug::EmitSectionLabels() {
2244 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
2246 // Dwarf sections base addresses.
2247 DwarfInfoSectionSym =
2248 EmitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
2249 DwarfAbbrevSectionSym =
2250 EmitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
2251 EmitSectionSym(Asm, TLOF.getDwarfARangesSection());
2253 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
2254 EmitSectionSym(Asm, MacroInfo);
2256 EmitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
2257 EmitSectionSym(Asm, TLOF.getDwarfLocSection());
2258 EmitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
2259 EmitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
2260 DwarfStrSectionSym =
2261 EmitSectionSym(Asm, TLOF.getDwarfStrSection(), "section_str");
2262 DwarfDebugRangeSectionSym = EmitSectionSym(Asm, TLOF.getDwarfRangesSection(),
2265 DwarfDebugLocSectionSym = EmitSectionSym(Asm, TLOF.getDwarfLocSection(),
2266 "section_debug_loc");
2268 TextSectionSym = EmitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
2269 EmitSectionSym(Asm, TLOF.getDataSection());
2272 /// emitDIE - Recusively Emits a debug information entry.
2274 void DwarfDebug::emitDIE(DIE *Die) {
2275 // Get the abbreviation for this DIE.
2276 unsigned AbbrevNumber = Die->getAbbrevNumber();
2277 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2279 // Emit the code (index) for the abbreviation.
2280 if (Asm->isVerbose())
2281 Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
2282 Twine::utohexstr(Die->getOffset()) + ":0x" +
2283 Twine::utohexstr(Die->getSize()) + " " +
2284 dwarf::TagString(Abbrev->getTag()));
2285 Asm->EmitULEB128(AbbrevNumber);
2287 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2288 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2290 // Emit the DIE attribute values.
2291 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2292 unsigned Attr = AbbrevData[i].getAttribute();
2293 unsigned Form = AbbrevData[i].getForm();
2294 assert(Form && "Too many attributes for DIE (check abbreviation)");
2296 if (Asm->isVerbose())
2297 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
2300 case dwarf::DW_AT_sibling:
2301 Asm->EmitInt32(Die->getSiblingOffset());
2303 case dwarf::DW_AT_abstract_origin: {
2304 DIEEntry *E = cast<DIEEntry>(Values[i]);
2305 DIE *Origin = E->getEntry();
2306 unsigned Addr = Origin->getOffset();
2307 Asm->EmitInt32(Addr);
2310 case dwarf::DW_AT_ranges: {
2311 // DW_AT_range Value encodes offset in debug_range section.
2312 DIEInteger *V = cast<DIEInteger>(Values[i]);
2314 if (Asm->MAI->doesDwarfUsesLabelOffsetForRanges()) {
2315 Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym,
2319 Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
2321 DwarfDebugRangeSectionSym,
2326 case dwarf::DW_AT_location: {
2327 if (UseDotDebugLocEntry.count(Die) != 0) {
2328 DIELabel *L = cast<DIELabel>(Values[i]);
2329 Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
2331 Values[i]->EmitValue(Asm, Form);
2334 case dwarf::DW_AT_accessibility: {
2335 if (Asm->isVerbose()) {
2336 DIEInteger *V = cast<DIEInteger>(Values[i]);
2337 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
2339 Values[i]->EmitValue(Asm, Form);
2343 // Emit an attribute using the defined form.
2344 Values[i]->EmitValue(Asm, Form);
2349 // Emit the DIE children if any.
2350 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
2351 const std::vector<DIE *> &Children = Die->getChildren();
2353 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2354 emitDIE(Children[j]);
2356 if (Asm->isVerbose())
2357 Asm->OutStreamer.AddComment("End Of Children Mark");
2362 /// emitDebugInfo - Emit the debug info section.
2364 void DwarfDebug::emitDebugInfo() {
2365 // Start debug info section.
2366 Asm->OutStreamer.SwitchSection(
2367 Asm->getObjFileLowering().getDwarfInfoSection());
2368 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2369 E = CUMap.end(); I != E; ++I) {
2370 CompileUnit *TheCU = I->second;
2371 DIE *Die = TheCU->getCUDie();
2373 // Emit the compile units header.
2374 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_begin",
2377 // Emit size of content not including length itself
2378 unsigned ContentSize = Die->getSize() +
2379 sizeof(int16_t) + // DWARF version number
2380 sizeof(int32_t) + // Offset Into Abbrev. Section
2381 sizeof(int8_t); // Pointer Size (in bytes)
2383 Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
2384 Asm->EmitInt32(ContentSize);
2385 Asm->OutStreamer.AddComment("DWARF version number");
2386 Asm->EmitInt16(dwarf::DWARF_VERSION);
2387 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
2388 Asm->EmitSectionOffset(Asm->GetTempSymbol("abbrev_begin"),
2389 DwarfAbbrevSectionSym);
2390 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2391 Asm->EmitInt8(Asm->getTargetData().getPointerSize());
2394 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_end", TheCU->getID()));
2398 /// emitAbbreviations - Emit the abbreviation section.
2400 void DwarfDebug::emitAbbreviations() const {
2401 // Check to see if it is worth the effort.
2402 if (!Abbreviations.empty()) {
2403 // Start the debug abbrev section.
2404 Asm->OutStreamer.SwitchSection(
2405 Asm->getObjFileLowering().getDwarfAbbrevSection());
2407 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_begin"));
2409 // For each abbrevation.
2410 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
2411 // Get abbreviation data
2412 const DIEAbbrev *Abbrev = Abbreviations[i];
2414 // Emit the abbrevations code (base 1 index.)
2415 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
2417 // Emit the abbreviations data.
2421 // Mark end of abbreviations.
2422 Asm->EmitULEB128(0, "EOM(3)");
2424 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_end"));
2428 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
2429 /// the line matrix.
2431 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
2432 // Define last address of section.
2433 Asm->OutStreamer.AddComment("Extended Op");
2436 Asm->OutStreamer.AddComment("Op size");
2437 Asm->EmitInt8(Asm->getTargetData().getPointerSize() + 1);
2438 Asm->OutStreamer.AddComment("DW_LNE_set_address");
2439 Asm->EmitInt8(dwarf::DW_LNE_set_address);
2441 Asm->OutStreamer.AddComment("Section end label");
2443 Asm->OutStreamer.EmitSymbolValue(Asm->GetTempSymbol("section_end",SectionEnd),
2444 Asm->getTargetData().getPointerSize(),
2447 // Mark end of matrix.
2448 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
2454 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
2456 void DwarfDebug::emitDebugPubNames() {
2457 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2458 E = CUMap.end(); I != E; ++I) {
2459 CompileUnit *TheCU = I->second;
2460 // Start the dwarf pubnames section.
2461 Asm->OutStreamer.SwitchSection(
2462 Asm->getObjFileLowering().getDwarfPubNamesSection());
2464 Asm->OutStreamer.AddComment("Length of Public Names Info");
2465 Asm->EmitLabelDifference(
2466 Asm->GetTempSymbol("pubnames_end", TheCU->getID()),
2467 Asm->GetTempSymbol("pubnames_begin", TheCU->getID()), 4);
2469 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin",
2472 Asm->OutStreamer.AddComment("DWARF Version");
2473 Asm->EmitInt16(dwarf::DWARF_VERSION);
2475 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2476 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
2477 DwarfInfoSectionSym);
2479 Asm->OutStreamer.AddComment("Compilation Unit Length");
2480 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
2481 Asm->GetTempSymbol("info_begin", TheCU->getID()),
2484 const StringMap<DIE*> &Globals = TheCU->getGlobals();
2485 for (StringMap<DIE*>::const_iterator
2486 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2487 const char *Name = GI->getKeyData();
2488 DIE *Entity = GI->second;
2490 Asm->OutStreamer.AddComment("DIE offset");
2491 Asm->EmitInt32(Entity->getOffset());
2493 if (Asm->isVerbose())
2494 Asm->OutStreamer.AddComment("External Name");
2495 Asm->OutStreamer.EmitBytes(StringRef(Name, strlen(Name)+1), 0);
2498 Asm->OutStreamer.AddComment("End Mark");
2500 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_end",
2505 void DwarfDebug::emitDebugPubTypes() {
2506 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2507 E = CUMap.end(); I != E; ++I) {
2508 CompileUnit *TheCU = I->second;
2509 // Start the dwarf pubnames section.
2510 Asm->OutStreamer.SwitchSection(
2511 Asm->getObjFileLowering().getDwarfPubTypesSection());
2512 Asm->OutStreamer.AddComment("Length of Public Types Info");
2513 Asm->EmitLabelDifference(
2514 Asm->GetTempSymbol("pubtypes_end", TheCU->getID()),
2515 Asm->GetTempSymbol("pubtypes_begin", TheCU->getID()), 4);
2517 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_begin",
2520 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DWARF Version");
2521 Asm->EmitInt16(dwarf::DWARF_VERSION);
2523 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2524 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
2525 DwarfInfoSectionSym);
2527 Asm->OutStreamer.AddComment("Compilation Unit Length");
2528 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
2529 Asm->GetTempSymbol("info_begin", TheCU->getID()),
2532 const StringMap<DIE*> &Globals = TheCU->getGlobalTypes();
2533 for (StringMap<DIE*>::const_iterator
2534 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2535 const char *Name = GI->getKeyData();
2536 DIE * Entity = GI->second;
2538 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2539 Asm->EmitInt32(Entity->getOffset());
2541 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("External Name");
2542 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1), 0);
2545 Asm->OutStreamer.AddComment("End Mark");
2547 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_end",
2552 /// emitDebugStr - Emit visible names into a debug str section.
2554 void DwarfDebug::emitDebugStr() {
2555 // Check to see if it is worth the effort.
2556 if (StringPool.empty()) return;
2558 // Start the dwarf str section.
2559 Asm->OutStreamer.SwitchSection(
2560 Asm->getObjFileLowering().getDwarfStrSection());
2562 // Get all of the string pool entries and put them in an array by their ID so
2563 // we can sort them.
2564 SmallVector<std::pair<unsigned,
2565 StringMapEntry<std::pair<MCSymbol*, unsigned> >*>, 64> Entries;
2567 for (StringMap<std::pair<MCSymbol*, unsigned> >::iterator
2568 I = StringPool.begin(), E = StringPool.end(); I != E; ++I)
2569 Entries.push_back(std::make_pair(I->second.second, &*I));
2571 array_pod_sort(Entries.begin(), Entries.end());
2573 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2574 // Emit a label for reference from debug information entries.
2575 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
2577 // Emit the string itself.
2578 Asm->OutStreamer.EmitBytes(Entries[i].second->getKey(), 0/*addrspace*/);
2582 /// emitDebugLoc - Emit visible names into a debug loc section.
2584 void DwarfDebug::emitDebugLoc() {
2585 if (DotDebugLocEntries.empty())
2588 for (SmallVector<DotDebugLocEntry, 4>::iterator
2589 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2591 DotDebugLocEntry &Entry = *I;
2592 if (I + 1 != DotDebugLocEntries.end())
2596 // Start the dwarf loc section.
2597 Asm->OutStreamer.SwitchSection(
2598 Asm->getObjFileLowering().getDwarfLocSection());
2599 unsigned char Size = Asm->getTargetData().getPointerSize();
2600 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
2602 for (SmallVector<DotDebugLocEntry, 4>::iterator
2603 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2604 I != E; ++I, ++index) {
2605 DotDebugLocEntry &Entry = *I;
2606 if (Entry.isMerged()) continue;
2607 if (Entry.isEmpty()) {
2608 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2609 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2610 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
2612 Asm->OutStreamer.EmitSymbolValue(Entry.Begin, Size, 0);
2613 Asm->OutStreamer.EmitSymbolValue(Entry.End, Size, 0);
2614 DIVariable DV(Entry.Variable);
2615 Asm->OutStreamer.AddComment("Loc expr size");
2616 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
2617 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
2618 Asm->EmitLabelDifference(end, begin, 2);
2619 Asm->OutStreamer.EmitLabel(begin);
2620 if (Entry.isInt()) {
2621 DIBasicType BTy(DV.getType());
2623 (BTy.getEncoding() == dwarf::DW_ATE_signed
2624 || BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
2625 Asm->OutStreamer.AddComment("DW_OP_consts");
2626 Asm->EmitInt8(dwarf::DW_OP_consts);
2627 Asm->EmitSLEB128(Entry.getInt());
2629 Asm->OutStreamer.AddComment("DW_OP_constu");
2630 Asm->EmitInt8(dwarf::DW_OP_constu);
2631 Asm->EmitULEB128(Entry.getInt());
2633 } else if (Entry.isLocation()) {
2634 if (!DV.hasComplexAddress())
2636 Asm->EmitDwarfRegOp(Entry.Loc);
2638 // Complex address entry.
2639 unsigned N = DV.getNumAddrElements();
2641 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
2642 if (Entry.Loc.getOffset()) {
2644 Asm->EmitDwarfRegOp(Entry.Loc);
2645 Asm->OutStreamer.AddComment("DW_OP_deref");
2646 Asm->EmitInt8(dwarf::DW_OP_deref);
2647 Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
2648 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2649 Asm->EmitSLEB128(DV.getAddrElement(1));
2651 // If first address element is OpPlus then emit
2652 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
2653 MachineLocation Loc(Entry.Loc.getReg(), DV.getAddrElement(1));
2654 Asm->EmitDwarfRegOp(Loc);
2658 Asm->EmitDwarfRegOp(Entry.Loc);
2661 // Emit remaining complex address elements.
2662 for (; i < N; ++i) {
2663 uint64_t Element = DV.getAddrElement(i);
2664 if (Element == DIBuilder::OpPlus) {
2665 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2666 Asm->EmitULEB128(DV.getAddrElement(++i));
2667 } else if (Element == DIBuilder::OpDeref)
2668 Asm->EmitInt8(dwarf::DW_OP_deref);
2669 else llvm_unreachable("unknown Opcode found in complex address");
2673 // else ... ignore constant fp. There is not any good way to
2674 // to represent them here in dwarf.
2675 Asm->OutStreamer.EmitLabel(end);
2680 /// EmitDebugARanges - Emit visible names into a debug aranges section.
2682 void DwarfDebug::EmitDebugARanges() {
2683 // Start the dwarf aranges section.
2684 Asm->OutStreamer.SwitchSection(
2685 Asm->getObjFileLowering().getDwarfARangesSection());
2688 /// emitDebugRanges - Emit visible names into a debug ranges section.
2690 void DwarfDebug::emitDebugRanges() {
2691 // Start the dwarf ranges section.
2692 Asm->OutStreamer.SwitchSection(
2693 Asm->getObjFileLowering().getDwarfRangesSection());
2694 unsigned char Size = Asm->getTargetData().getPointerSize();
2695 for (SmallVector<const MCSymbol *, 8>::iterator
2696 I = DebugRangeSymbols.begin(), E = DebugRangeSymbols.end();
2699 Asm->OutStreamer.EmitSymbolValue(const_cast<MCSymbol*>(*I), Size, 0);
2701 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2705 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
2707 void DwarfDebug::emitDebugMacInfo() {
2708 if (const MCSection *LineInfo =
2709 Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
2710 // Start the dwarf macinfo section.
2711 Asm->OutStreamer.SwitchSection(LineInfo);
2715 /// emitDebugInlineInfo - Emit inline info using following format.
2717 /// 1. length of section
2718 /// 2. Dwarf version number
2719 /// 3. address size.
2721 /// Entries (one "entry" for each function that was inlined):
2723 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
2724 /// otherwise offset into __debug_str for regular function name.
2725 /// 2. offset into __debug_str section for regular function name.
2726 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
2727 /// instances for the function.
2729 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
2730 /// inlined instance; the die_offset points to the inlined_subroutine die in the
2731 /// __debug_info section, and the low_pc is the starting address for the
2732 /// inlining instance.
2733 void DwarfDebug::emitDebugInlineInfo() {
2734 if (!Asm->MAI->doesDwarfUsesInlineInfoSection())
2740 Asm->OutStreamer.SwitchSection(
2741 Asm->getObjFileLowering().getDwarfDebugInlineSection());
2743 Asm->OutStreamer.AddComment("Length of Debug Inlined Information Entry");
2744 Asm->EmitLabelDifference(Asm->GetTempSymbol("debug_inlined_end", 1),
2745 Asm->GetTempSymbol("debug_inlined_begin", 1), 4);
2747 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_begin", 1));
2749 Asm->OutStreamer.AddComment("Dwarf Version");
2750 Asm->EmitInt16(dwarf::DWARF_VERSION);
2751 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2752 Asm->EmitInt8(Asm->getTargetData().getPointerSize());
2754 for (SmallVector<const MDNode *, 4>::iterator I = InlinedSPNodes.begin(),
2755 E = InlinedSPNodes.end(); I != E; ++I) {
2757 const MDNode *Node = *I;
2758 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator II
2759 = InlineInfo.find(Node);
2760 SmallVector<InlineInfoLabels, 4> &Labels = II->second;
2761 DISubprogram SP(Node);
2762 StringRef LName = SP.getLinkageName();
2763 StringRef Name = SP.getName();
2765 Asm->OutStreamer.AddComment("MIPS linkage name");
2766 if (LName.empty()) {
2767 Asm->OutStreamer.EmitBytes(Name, 0);
2768 Asm->OutStreamer.EmitIntValue(0, 1, 0); // nul terminator.
2770 Asm->EmitSectionOffset(getStringPoolEntry(getRealLinkageName(LName)),
2771 DwarfStrSectionSym);
2773 Asm->OutStreamer.AddComment("Function name");
2774 Asm->EmitSectionOffset(getStringPoolEntry(Name), DwarfStrSectionSym);
2775 Asm->EmitULEB128(Labels.size(), "Inline count");
2777 for (SmallVector<InlineInfoLabels, 4>::iterator LI = Labels.begin(),
2778 LE = Labels.end(); LI != LE; ++LI) {
2779 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2780 Asm->EmitInt32(LI->second->getOffset());
2782 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("low_pc");
2783 Asm->OutStreamer.EmitSymbolValue(LI->first,
2784 Asm->getTargetData().getPointerSize(),0);
2788 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_end", 1));