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 if (End->isDebugValue())
1432 SLabel = getLabelBeforeInsn(End);
1434 // End is a normal instruction clobbering the range.
1435 SLabel = getLabelAfterInsn(End);
1436 assert(SLabel && "Forgot label after clobber instruction");
1441 // The value is valid until the next DBG_VALUE or clobber.
1442 MachineLocation MLoc;
1443 if (Begin->getNumOperands() == 3) {
1444 if (Begin->getOperand(0).isReg() && Begin->getOperand(1).isImm()) {
1445 MLoc.set(Begin->getOperand(0).getReg(),
1446 Begin->getOperand(1).getImm());
1448 push_back(DotDebugLocEntry(FLabel, SLabel, MLoc, Var));
1450 // FIXME: Handle isFPImm also.
1451 else if (Begin->getOperand(0).isImm()) {
1453 push_back(DotDebugLocEntry(FLabel, SLabel,
1454 Begin->getOperand(0).getImm()));
1457 MLoc = Asm->getDebugValueLocation(Begin);
1459 push_back(DotDebugLocEntry(FLabel, SLabel, MLoc, Var));
1462 DotDebugLocEntries.push_back(DotDebugLocEntry());
1465 // Collect info for variables that were optimized out.
1466 const Function *F = MF->getFunction();
1467 if (NamedMDNode *NMD = getFnSpecificMDNode(*(F->getParent()), F->getName())) {
1468 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1469 DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
1470 if (!DV || !Processed.insert(DV))
1472 DbgScope *Scope = DbgScopeMap.lookup(DV.getContext());
1474 Scope->addVariable(new DbgVariable(DV));
1479 /// getLabelBeforeInsn - Return Label preceding the instruction.
1480 const MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
1481 MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
1482 assert(Label && "Didn't insert label before instruction");
1486 /// getLabelAfterInsn - Return Label immediately following the instruction.
1487 const MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
1488 return LabelsAfterInsn.lookup(MI);
1491 /// beginInstruction - Process beginning of an instruction.
1492 void DwarfDebug::beginInstruction(const MachineInstr *MI) {
1493 // Check if source location changes, but ignore DBG_VALUE locations.
1494 if (!MI->isDebugValue()) {
1495 DebugLoc DL = MI->getDebugLoc();
1496 if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
1497 unsigned Flags = DWARF2_FLAG_IS_STMT;
1499 if (DL == PrologEndLoc) {
1500 Flags |= DWARF2_FLAG_PROLOGUE_END;
1501 PrologEndLoc = DebugLoc();
1503 if (!DL.isUnknown()) {
1504 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
1505 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
1507 recordSourceLine(0, 0, 0, 0);
1511 // Insert labels where requested.
1512 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1513 LabelsBeforeInsn.find(MI);
1516 if (I == LabelsBeforeInsn.end())
1519 // Label already assigned.
1524 PrevLabel = MMI->getContext().CreateTempSymbol();
1525 Asm->OutStreamer.EmitLabel(PrevLabel);
1527 I->second = PrevLabel;
1530 /// endInstruction - Process end of an instruction.
1531 void DwarfDebug::endInstruction(const MachineInstr *MI) {
1532 // Don't create a new label after DBG_VALUE instructions.
1533 // They don't generate code.
1534 if (!MI->isDebugValue())
1537 DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
1538 LabelsAfterInsn.find(MI);
1541 if (I == LabelsAfterInsn.end())
1544 // Label already assigned.
1548 // We need a label after this instruction.
1550 PrevLabel = MMI->getContext().CreateTempSymbol();
1551 Asm->OutStreamer.EmitLabel(PrevLabel);
1553 I->second = PrevLabel;
1556 /// getOrCreateDbgScope - Create DbgScope for the scope.
1557 DbgScope *DwarfDebug::getOrCreateDbgScope(const MDNode *Scope,
1558 const MDNode *InlinedAt) {
1560 DbgScope *WScope = DbgScopeMap.lookup(Scope);
1563 WScope = new DbgScope(NULL, DIDescriptor(Scope), NULL);
1564 DbgScopeMap.insert(std::make_pair(Scope, WScope));
1565 if (DIDescriptor(Scope).isLexicalBlock()) {
1567 getOrCreateDbgScope(DILexicalBlock(Scope).getContext(), NULL);
1568 WScope->setParent(Parent);
1569 Parent->addScope(WScope);
1572 if (!WScope->getParent()) {
1573 StringRef SPName = DISubprogram(Scope).getLinkageName();
1574 // We used to check only for a linkage name, but that fails
1575 // since we began omitting the linkage name for private
1576 // functions. The new way is to check for the name in metadata,
1577 // but that's not supported in old .ll test cases. Ergo, we
1579 if (SPName == Asm->MF->getFunction()->getName() ||
1580 DISubprogram(Scope).getFunction() == Asm->MF->getFunction())
1581 CurrentFnDbgScope = WScope;
1587 getOrCreateAbstractScope(Scope);
1588 DbgScope *WScope = DbgScopeMap.lookup(InlinedAt);
1592 WScope = new DbgScope(NULL, DIDescriptor(Scope), InlinedAt);
1593 DbgScopeMap.insert(std::make_pair(InlinedAt, WScope));
1594 DILocation DL(InlinedAt);
1596 getOrCreateDbgScope(DL.getScope(), DL.getOrigLocation());
1597 WScope->setParent(Parent);
1598 Parent->addScope(WScope);
1600 ConcreteScopes[InlinedAt] = WScope;
1605 /// hasValidLocation - Return true if debug location entry attached with
1606 /// machine instruction encodes valid location info.
1607 static bool hasValidLocation(LLVMContext &Ctx,
1608 const MachineInstr *MInsn,
1609 const MDNode *&Scope, const MDNode *&InlinedAt) {
1610 DebugLoc DL = MInsn->getDebugLoc();
1611 if (DL.isUnknown()) return false;
1613 const MDNode *S = DL.getScope(Ctx);
1615 // There is no need to create another DIE for compile unit. For all
1616 // other scopes, create one DbgScope now. This will be translated
1617 // into a scope DIE at the end.
1618 if (DIScope(S).isCompileUnit()) return false;
1621 InlinedAt = DL.getInlinedAt(Ctx);
1625 /// calculateDominanceGraph - Calculate dominance graph for DbgScope
1627 static void calculateDominanceGraph(DbgScope *Scope) {
1628 assert (Scope && "Unable to calculate scop edominance graph!");
1629 SmallVector<DbgScope *, 4> WorkStack;
1630 WorkStack.push_back(Scope);
1631 unsigned Counter = 0;
1632 while (!WorkStack.empty()) {
1633 DbgScope *WS = WorkStack.back();
1634 const SmallVector<DbgScope *, 4> &Children = WS->getScopes();
1635 bool visitedChildren = false;
1636 for (SmallVector<DbgScope *, 4>::const_iterator SI = Children.begin(),
1637 SE = Children.end(); SI != SE; ++SI) {
1638 DbgScope *ChildScope = *SI;
1639 if (!ChildScope->getDFSOut()) {
1640 WorkStack.push_back(ChildScope);
1641 visitedChildren = true;
1642 ChildScope->setDFSIn(++Counter);
1646 if (!visitedChildren) {
1647 WorkStack.pop_back();
1648 WS->setDFSOut(++Counter);
1653 /// printDbgScopeInfo - Print DbgScope info for each machine instruction.
1655 void printDbgScopeInfo(LLVMContext &Ctx, const MachineFunction *MF,
1656 DenseMap<const MachineInstr *, DbgScope *> &MI2ScopeMap)
1659 unsigned PrevDFSIn = 0;
1660 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1662 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1664 const MachineInstr *MInsn = II;
1665 const MDNode *Scope = NULL;
1666 const MDNode *InlinedAt = NULL;
1668 // Check if instruction has valid location information.
1669 if (hasValidLocation(Ctx, MInsn, Scope, InlinedAt)) {
1673 DenseMap<const MachineInstr *, DbgScope *>::iterator DI =
1674 MI2ScopeMap.find(MInsn);
1675 if (DI != MI2ScopeMap.end()) {
1676 DbgScope *S = DI->second;
1677 dbgs() << S->getDFSIn();
1678 PrevDFSIn = S->getDFSIn();
1680 dbgs() << PrevDFSIn;
1682 dbgs() << " [ x" << PrevDFSIn;
1690 /// extractScopeInformation - Scan machine instructions in this function
1691 /// and collect DbgScopes. Return true, if at least one scope was found.
1692 bool DwarfDebug::extractScopeInformation() {
1693 // If scope information was extracted using .dbg intrinsics then there is not
1694 // any need to extract these information by scanning each instruction.
1695 if (!DbgScopeMap.empty())
1698 // Scan each instruction and create scopes. First build working set of scopes.
1699 LLVMContext &Ctx = Asm->MF->getFunction()->getContext();
1700 SmallVector<DbgRange, 4> MIRanges;
1701 DenseMap<const MachineInstr *, DbgScope *> MI2ScopeMap;
1702 const MDNode *PrevScope = NULL;
1703 const MDNode *PrevInlinedAt = NULL;
1704 const MachineInstr *RangeBeginMI = NULL;
1705 const MachineInstr *PrevMI = NULL;
1706 for (MachineFunction::const_iterator I = Asm->MF->begin(), E = Asm->MF->end();
1708 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1710 const MachineInstr *MInsn = II;
1711 const MDNode *Scope = NULL;
1712 const MDNode *InlinedAt = NULL;
1714 // Check if instruction has valid location information.
1715 if (!hasValidLocation(Ctx, MInsn, Scope, InlinedAt)) {
1720 // If scope has not changed then skip this instruction.
1721 if (Scope == PrevScope && PrevInlinedAt == InlinedAt) {
1726 // Ignore DBG_VALUE. It does not contribute any instruction in output.
1727 if (MInsn->isDebugValue())
1731 // If we have alread seen a beginning of a instruction range and
1732 // current instruction scope does not match scope of first instruction
1733 // in this range then create a new instruction range.
1734 DbgRange R(RangeBeginMI, PrevMI);
1735 MI2ScopeMap[RangeBeginMI] = getOrCreateDbgScope(PrevScope,
1737 MIRanges.push_back(R);
1740 // This is a beginning of a new instruction range.
1741 RangeBeginMI = MInsn;
1743 // Reset previous markers.
1746 PrevInlinedAt = InlinedAt;
1750 // Create last instruction range.
1751 if (RangeBeginMI && PrevMI && PrevScope) {
1752 DbgRange R(RangeBeginMI, PrevMI);
1753 MIRanges.push_back(R);
1754 MI2ScopeMap[RangeBeginMI] = getOrCreateDbgScope(PrevScope, PrevInlinedAt);
1757 if (!CurrentFnDbgScope)
1760 calculateDominanceGraph(CurrentFnDbgScope);
1762 printDbgScopeInfo(Ctx, Asm->MF, MI2ScopeMap);
1764 // Find ranges of instructions covered by each DbgScope;
1765 DbgScope *PrevDbgScope = NULL;
1766 for (SmallVector<DbgRange, 4>::const_iterator RI = MIRanges.begin(),
1767 RE = MIRanges.end(); RI != RE; ++RI) {
1768 const DbgRange &R = *RI;
1769 DbgScope *S = MI2ScopeMap.lookup(R.first);
1770 assert (S && "Lost DbgScope for a machine instruction!");
1771 if (PrevDbgScope && !PrevDbgScope->dominates(S))
1772 PrevDbgScope->closeInsnRange(S);
1773 S->openInsnRange(R.first);
1774 S->extendInsnRange(R.second);
1779 PrevDbgScope->closeInsnRange();
1781 identifyScopeMarkers();
1783 return !DbgScopeMap.empty();
1786 /// identifyScopeMarkers() -
1787 /// Each DbgScope has first instruction and last instruction to mark beginning
1788 /// and end of a scope respectively. Create an inverse map that list scopes
1789 /// starts (and ends) with an instruction. One instruction may start (or end)
1790 /// multiple scopes. Ignore scopes that are not reachable.
1791 void DwarfDebug::identifyScopeMarkers() {
1792 SmallVector<DbgScope *, 4> WorkList;
1793 WorkList.push_back(CurrentFnDbgScope);
1794 while (!WorkList.empty()) {
1795 DbgScope *S = WorkList.pop_back_val();
1797 const SmallVector<DbgScope *, 4> &Children = S->getScopes();
1798 if (!Children.empty())
1799 for (SmallVector<DbgScope *, 4>::const_iterator SI = Children.begin(),
1800 SE = Children.end(); SI != SE; ++SI)
1801 WorkList.push_back(*SI);
1803 if (S->isAbstractScope())
1806 const SmallVector<DbgRange, 4> &Ranges = S->getRanges();
1809 for (SmallVector<DbgRange, 4>::const_iterator RI = Ranges.begin(),
1810 RE = Ranges.end(); RI != RE; ++RI) {
1811 assert(RI->first && "DbgRange does not have first instruction!");
1812 assert(RI->second && "DbgRange does not have second instruction!");
1813 requestLabelBeforeInsn(RI->first);
1814 requestLabelAfterInsn(RI->second);
1819 /// getScopeNode - Get MDNode for DebugLoc's scope.
1820 static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
1821 if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
1822 return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
1823 return DL.getScope(Ctx);
1826 /// getFnDebugLoc - Walk up the scope chain of given debug loc and find
1827 /// line number info for the function.
1828 static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
1829 const MDNode *Scope = getScopeNode(DL, Ctx);
1830 DISubprogram SP = getDISubprogram(Scope);
1832 return DebugLoc::get(SP.getLineNumber(), 0, SP);
1836 /// beginFunction - Gather pre-function debug information. Assumes being
1837 /// emitted immediately after the function entry point.
1838 void DwarfDebug::beginFunction(const MachineFunction *MF) {
1839 if (!MMI->hasDebugInfo()) return;
1840 if (!extractScopeInformation()) return;
1842 FunctionBeginSym = Asm->GetTempSymbol("func_begin",
1843 Asm->getFunctionNumber());
1844 // Assumes in correct section after the entry point.
1845 Asm->OutStreamer.EmitLabel(FunctionBeginSym);
1847 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
1849 /// ProcessedArgs - Collection of arguments already processed.
1850 SmallPtrSet<const MDNode *, 8> ProcessedArgs;
1851 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1852 /// LiveUserVar - Map physreg numbers to the MDNode they contain.
1853 std::vector<const MDNode*> LiveUserVar(TRI->getNumRegs());
1855 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1857 bool AtBlockEntry = true;
1858 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1860 const MachineInstr *MI = II;
1862 if (MI->isDebugValue()) {
1863 assert (MI->getNumOperands() > 1 && "Invalid machine instruction!");
1865 // Keep track of user variables.
1867 MI->getOperand(MI->getNumOperands() - 1).getMetadata();
1869 // Variable is in a register, we need to check for clobbers.
1870 if (isDbgValueInDefinedReg(MI))
1871 LiveUserVar[MI->getOperand(0).getReg()] = Var;
1873 // Check the history of this variable.
1874 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
1875 if (History.empty()) {
1876 UserVariables.push_back(Var);
1877 // The first mention of a function argument gets the FunctionBeginSym
1878 // label, so arguments are visible when breaking at function entry.
1880 if (DV.Verify() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
1881 DISubprogram(getDISubprogram(DV.getContext()))
1882 .describes(MF->getFunction()))
1883 LabelsBeforeInsn[MI] = FunctionBeginSym;
1885 // We have seen this variable before. Try to coalesce DBG_VALUEs.
1886 const MachineInstr *Prev = History.back();
1887 if (Prev->isDebugValue()) {
1888 // Coalesce identical entries at the end of History.
1889 if (History.size() >= 2 &&
1890 Prev->isIdenticalTo(History[History.size() - 2]))
1893 // Terminate old register assignments that don't reach MI;
1894 MachineFunction::const_iterator PrevMBB = Prev->getParent();
1895 if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
1896 isDbgValueInDefinedReg(Prev)) {
1897 // Previous register assignment needs to terminate at the end of
1899 MachineBasicBlock::const_iterator LastMI =
1900 PrevMBB->getLastNonDebugInstr();
1901 if (LastMI == PrevMBB->end())
1902 // Drop DBG_VALUE for empty range.
1905 // Terminate after LastMI.
1906 History.push_back(LastMI);
1911 History.push_back(MI);
1913 // Not a DBG_VALUE instruction.
1915 AtBlockEntry = false;
1917 // First known non DBG_VALUE location marks beginning of function
1919 if (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown())
1920 PrologEndLoc = MI->getDebugLoc();
1922 // Check if the instruction clobbers any registers with debug vars.
1923 for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
1924 MOE = MI->operands_end(); MOI != MOE; ++MOI) {
1925 if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
1927 for (const unsigned *AI = TRI->getOverlaps(MOI->getReg());
1928 unsigned Reg = *AI; ++AI) {
1929 const MDNode *Var = LiveUserVar[Reg];
1932 // Reg is now clobbered.
1933 LiveUserVar[Reg] = 0;
1935 // Was MD last defined by a DBG_VALUE referring to Reg?
1936 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
1937 if (HistI == DbgValues.end())
1939 SmallVectorImpl<const MachineInstr*> &History = HistI->second;
1940 if (History.empty())
1942 const MachineInstr *Prev = History.back();
1943 // Sanity-check: Register assignments are terminated at the end of
1945 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
1947 // Is the variable still in Reg?
1948 if (!isDbgValueInDefinedReg(Prev) ||
1949 Prev->getOperand(0).getReg() != Reg)
1951 // Var is clobbered. Make sure the next instruction gets a label.
1952 History.push_back(MI);
1959 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
1961 SmallVectorImpl<const MachineInstr*> &History = I->second;
1962 if (History.empty())
1965 // Make sure the final register assignments are terminated.
1966 const MachineInstr *Prev = History.back();
1967 if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
1968 const MachineBasicBlock *PrevMBB = Prev->getParent();
1969 MachineBasicBlock::const_iterator LastMI = PrevMBB->getLastNonDebugInstr();
1970 if (LastMI == PrevMBB->end())
1971 // Drop DBG_VALUE for empty range.
1974 // Terminate after LastMI.
1975 History.push_back(LastMI);
1978 // Request labels for the full history.
1979 for (unsigned i = 0, e = History.size(); i != e; ++i) {
1980 const MachineInstr *MI = History[i];
1981 if (MI->isDebugValue())
1982 requestLabelBeforeInsn(MI);
1984 requestLabelAfterInsn(MI);
1988 PrevInstLoc = DebugLoc();
1989 PrevLabel = FunctionBeginSym;
1991 // Record beginning of function.
1992 if (!PrologEndLoc.isUnknown()) {
1993 DebugLoc FnStartDL = getFnDebugLoc(PrologEndLoc,
1994 MF->getFunction()->getContext());
1995 recordSourceLine(FnStartDL.getLine(), FnStartDL.getCol(),
1996 FnStartDL.getScope(MF->getFunction()->getContext()),
1997 DWARF2_FLAG_IS_STMT);
2001 /// endFunction - Gather and emit post-function debug information.
2003 void DwarfDebug::endFunction(const MachineFunction *MF) {
2004 if (!MMI->hasDebugInfo() || DbgScopeMap.empty()) return;
2006 if (CurrentFnDbgScope) {
2008 // Define end label for subprogram.
2009 FunctionEndSym = Asm->GetTempSymbol("func_end",
2010 Asm->getFunctionNumber());
2011 // Assumes in correct section after the entry point.
2012 Asm->OutStreamer.EmitLabel(FunctionEndSym);
2014 SmallPtrSet<const MDNode *, 16> ProcessedVars;
2015 collectVariableInfo(MF, ProcessedVars);
2017 // Construct abstract scopes.
2018 for (SmallVector<DbgScope *, 4>::iterator AI = AbstractScopesList.begin(),
2019 AE = AbstractScopesList.end(); AI != AE; ++AI) {
2020 DISubprogram SP((*AI)->getScopeNode());
2022 // Collect info for variables that were optimized out.
2023 StringRef FName = SP.getLinkageName();
2025 FName = SP.getName();
2026 if (NamedMDNode *NMD =
2027 getFnSpecificMDNode(*(MF->getFunction()->getParent()), FName)) {
2028 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2029 DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
2030 if (!DV || !ProcessedVars.insert(DV))
2032 DbgScope *Scope = AbstractScopes.lookup(DV.getContext());
2034 Scope->addVariable(new DbgVariable(DV));
2038 if (ProcessedSPNodes.count((*AI)->getScopeNode()) == 0)
2039 constructScopeDIE(*AI);
2042 DIE *CurFnDIE = constructScopeDIE(CurrentFnDbgScope);
2044 if (!DisableFramePointerElim(*MF))
2045 getCompileUnit(CurrentFnDbgScope->getScopeNode())->addUInt(CurFnDIE,
2046 dwarf::DW_AT_APPLE_omit_frame_ptr,
2047 dwarf::DW_FORM_flag, 1);
2050 DebugFrames.push_back(FunctionDebugFrameInfo(Asm->getFunctionNumber(),
2051 MMI->getFrameMoves()));
2055 CurrentFnDbgScope = NULL;
2056 DeleteContainerPointers(CurrentFnArguments);
2057 DbgVariableToFrameIndexMap.clear();
2058 VarToAbstractVarMap.clear();
2059 DbgVariableToDbgInstMap.clear();
2060 DeleteContainerSeconds(DbgScopeMap);
2061 UserVariables.clear();
2063 ConcreteScopes.clear();
2064 DeleteContainerSeconds(AbstractScopes);
2065 AbstractScopesList.clear();
2066 AbstractVariables.clear();
2067 LabelsBeforeInsn.clear();
2068 LabelsAfterInsn.clear();
2072 /// recordVariableFrameIndex - Record a variable's index.
2073 void DwarfDebug::recordVariableFrameIndex(const DbgVariable *V, int Index) {
2074 assert (V && "Invalid DbgVariable!");
2075 DbgVariableToFrameIndexMap[V] = Index;
2078 /// findVariableFrameIndex - Return true if frame index for the variable
2079 /// is found. Update FI to hold value of the index.
2080 bool DwarfDebug::findVariableFrameIndex(const DbgVariable *V, int *FI) {
2081 assert (V && "Invalid DbgVariable!");
2082 DenseMap<const DbgVariable *, int>::iterator I =
2083 DbgVariableToFrameIndexMap.find(V);
2084 if (I == DbgVariableToFrameIndexMap.end())
2090 /// findDbgScope - Find DbgScope for the debug loc attached with an
2092 DbgScope *DwarfDebug::findDbgScope(const MachineInstr *MInsn) {
2093 DbgScope *Scope = NULL;
2095 MInsn->getParent()->getParent()->getFunction()->getContext();
2096 DebugLoc DL = MInsn->getDebugLoc();
2101 if (const MDNode *IA = DL.getInlinedAt(Ctx))
2102 Scope = ConcreteScopes.lookup(IA);
2104 Scope = DbgScopeMap.lookup(DL.getScope(Ctx));
2110 /// recordSourceLine - Register a source line with debug info. Returns the
2111 /// unique label that was emitted and which provides correspondence to
2112 /// the source line list.
2113 void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
2119 DIDescriptor Scope(S);
2121 if (Scope.isCompileUnit()) {
2122 DICompileUnit CU(S);
2123 Fn = CU.getFilename();
2124 Dir = CU.getDirectory();
2125 } else if (Scope.isFile()) {
2127 Fn = F.getFilename();
2128 Dir = F.getDirectory();
2129 } else if (Scope.isSubprogram()) {
2131 Fn = SP.getFilename();
2132 Dir = SP.getDirectory();
2133 } else if (Scope.isLexicalBlock()) {
2134 DILexicalBlock DB(S);
2135 Fn = DB.getFilename();
2136 Dir = DB.getDirectory();
2138 assert(0 && "Unexpected scope info");
2140 Src = GetOrCreateSourceID(Fn, Dir);
2142 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags,
2146 //===----------------------------------------------------------------------===//
2148 //===----------------------------------------------------------------------===//
2150 /// computeSizeAndOffset - Compute the size and offset of a DIE.
2153 DwarfDebug::computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last) {
2154 // Get the children.
2155 const std::vector<DIE *> &Children = Die->getChildren();
2157 // If not last sibling and has children then add sibling offset attribute.
2158 if (!Last && !Children.empty())
2159 Die->addSiblingOffset(DIEValueAllocator);
2161 // Record the abbreviation.
2162 assignAbbrevNumber(Die->getAbbrev());
2164 // Get the abbreviation for this DIE.
2165 unsigned AbbrevNumber = Die->getAbbrevNumber();
2166 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2169 Die->setOffset(Offset);
2171 // Start the size with the size of abbreviation code.
2172 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
2174 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2175 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2177 // Size the DIE attribute values.
2178 for (unsigned i = 0, N = Values.size(); i < N; ++i)
2179 // Size attribute value.
2180 Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
2182 // Size the DIE children if any.
2183 if (!Children.empty()) {
2184 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
2185 "Children flag not set");
2187 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2188 Offset = computeSizeAndOffset(Children[j], Offset, (j + 1) == M);
2190 // End of children marker.
2191 Offset += sizeof(int8_t);
2194 Die->setSize(Offset - Die->getOffset());
2198 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
2200 void DwarfDebug::computeSizeAndOffsets() {
2201 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2202 E = CUMap.end(); I != E; ++I) {
2203 // Compute size of compile unit header.
2205 sizeof(int32_t) + // Length of Compilation Unit Info
2206 sizeof(int16_t) + // DWARF version number
2207 sizeof(int32_t) + // Offset Into Abbrev. Section
2208 sizeof(int8_t); // Pointer Size (in bytes)
2209 computeSizeAndOffset(I->second->getCUDie(), Offset, true);
2213 /// EmitSectionSym - Switch to the specified MCSection and emit an assembler
2214 /// temporary label to it if SymbolStem is specified.
2215 static MCSymbol *EmitSectionSym(AsmPrinter *Asm, const MCSection *Section,
2216 const char *SymbolStem = 0) {
2217 Asm->OutStreamer.SwitchSection(Section);
2218 if (!SymbolStem) return 0;
2220 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
2221 Asm->OutStreamer.EmitLabel(TmpSym);
2225 /// EmitSectionLabels - Emit initial Dwarf sections with a label at
2226 /// the start of each one.
2227 void DwarfDebug::EmitSectionLabels() {
2228 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
2230 // Dwarf sections base addresses.
2231 DwarfInfoSectionSym =
2232 EmitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
2233 DwarfAbbrevSectionSym =
2234 EmitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
2235 EmitSectionSym(Asm, TLOF.getDwarfARangesSection());
2237 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
2238 EmitSectionSym(Asm, MacroInfo);
2240 EmitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
2241 EmitSectionSym(Asm, TLOF.getDwarfLocSection());
2242 EmitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
2243 EmitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
2244 DwarfStrSectionSym =
2245 EmitSectionSym(Asm, TLOF.getDwarfStrSection(), "section_str");
2246 DwarfDebugRangeSectionSym = EmitSectionSym(Asm, TLOF.getDwarfRangesSection(),
2249 DwarfDebugLocSectionSym = EmitSectionSym(Asm, TLOF.getDwarfLocSection(),
2250 "section_debug_loc");
2252 TextSectionSym = EmitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
2253 EmitSectionSym(Asm, TLOF.getDataSection());
2256 /// emitDIE - Recusively Emits a debug information entry.
2258 void DwarfDebug::emitDIE(DIE *Die) {
2259 // Get the abbreviation for this DIE.
2260 unsigned AbbrevNumber = Die->getAbbrevNumber();
2261 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2263 // Emit the code (index) for the abbreviation.
2264 if (Asm->isVerbose())
2265 Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
2266 Twine::utohexstr(Die->getOffset()) + ":0x" +
2267 Twine::utohexstr(Die->getSize()) + " " +
2268 dwarf::TagString(Abbrev->getTag()));
2269 Asm->EmitULEB128(AbbrevNumber);
2271 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2272 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2274 // Emit the DIE attribute values.
2275 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2276 unsigned Attr = AbbrevData[i].getAttribute();
2277 unsigned Form = AbbrevData[i].getForm();
2278 assert(Form && "Too many attributes for DIE (check abbreviation)");
2280 if (Asm->isVerbose())
2281 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
2284 case dwarf::DW_AT_sibling:
2285 Asm->EmitInt32(Die->getSiblingOffset());
2287 case dwarf::DW_AT_abstract_origin: {
2288 DIEEntry *E = cast<DIEEntry>(Values[i]);
2289 DIE *Origin = E->getEntry();
2290 unsigned Addr = Origin->getOffset();
2291 Asm->EmitInt32(Addr);
2294 case dwarf::DW_AT_ranges: {
2295 // DW_AT_range Value encodes offset in debug_range section.
2296 DIEInteger *V = cast<DIEInteger>(Values[i]);
2298 if (Asm->MAI->doesDwarfUsesLabelOffsetForRanges()) {
2299 Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym,
2303 Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
2305 DwarfDebugRangeSectionSym,
2310 case dwarf::DW_AT_location: {
2311 if (UseDotDebugLocEntry.count(Die) != 0) {
2312 DIELabel *L = cast<DIELabel>(Values[i]);
2313 Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
2315 Values[i]->EmitValue(Asm, Form);
2318 case dwarf::DW_AT_accessibility: {
2319 if (Asm->isVerbose()) {
2320 DIEInteger *V = cast<DIEInteger>(Values[i]);
2321 Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
2323 Values[i]->EmitValue(Asm, Form);
2327 // Emit an attribute using the defined form.
2328 Values[i]->EmitValue(Asm, Form);
2333 // Emit the DIE children if any.
2334 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
2335 const std::vector<DIE *> &Children = Die->getChildren();
2337 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2338 emitDIE(Children[j]);
2340 if (Asm->isVerbose())
2341 Asm->OutStreamer.AddComment("End Of Children Mark");
2346 /// emitDebugInfo - Emit the debug info section.
2348 void DwarfDebug::emitDebugInfo() {
2349 // Start debug info section.
2350 Asm->OutStreamer.SwitchSection(
2351 Asm->getObjFileLowering().getDwarfInfoSection());
2352 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2353 E = CUMap.end(); I != E; ++I) {
2354 CompileUnit *TheCU = I->second;
2355 DIE *Die = TheCU->getCUDie();
2357 // Emit the compile units header.
2358 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_begin",
2361 // Emit size of content not including length itself
2362 unsigned ContentSize = Die->getSize() +
2363 sizeof(int16_t) + // DWARF version number
2364 sizeof(int32_t) + // Offset Into Abbrev. Section
2365 sizeof(int8_t); // Pointer Size (in bytes)
2367 Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
2368 Asm->EmitInt32(ContentSize);
2369 Asm->OutStreamer.AddComment("DWARF version number");
2370 Asm->EmitInt16(dwarf::DWARF_VERSION);
2371 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
2372 Asm->EmitSectionOffset(Asm->GetTempSymbol("abbrev_begin"),
2373 DwarfAbbrevSectionSym);
2374 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2375 Asm->EmitInt8(Asm->getTargetData().getPointerSize());
2378 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_end", TheCU->getID()));
2382 /// emitAbbreviations - Emit the abbreviation section.
2384 void DwarfDebug::emitAbbreviations() const {
2385 // Check to see if it is worth the effort.
2386 if (!Abbreviations.empty()) {
2387 // Start the debug abbrev section.
2388 Asm->OutStreamer.SwitchSection(
2389 Asm->getObjFileLowering().getDwarfAbbrevSection());
2391 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_begin"));
2393 // For each abbrevation.
2394 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
2395 // Get abbreviation data
2396 const DIEAbbrev *Abbrev = Abbreviations[i];
2398 // Emit the abbrevations code (base 1 index.)
2399 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
2401 // Emit the abbreviations data.
2405 // Mark end of abbreviations.
2406 Asm->EmitULEB128(0, "EOM(3)");
2408 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_end"));
2412 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
2413 /// the line matrix.
2415 void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
2416 // Define last address of section.
2417 Asm->OutStreamer.AddComment("Extended Op");
2420 Asm->OutStreamer.AddComment("Op size");
2421 Asm->EmitInt8(Asm->getTargetData().getPointerSize() + 1);
2422 Asm->OutStreamer.AddComment("DW_LNE_set_address");
2423 Asm->EmitInt8(dwarf::DW_LNE_set_address);
2425 Asm->OutStreamer.AddComment("Section end label");
2427 Asm->OutStreamer.EmitSymbolValue(Asm->GetTempSymbol("section_end",SectionEnd),
2428 Asm->getTargetData().getPointerSize(),
2431 // Mark end of matrix.
2432 Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
2438 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
2440 void DwarfDebug::emitDebugPubNames() {
2441 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2442 E = CUMap.end(); I != E; ++I) {
2443 CompileUnit *TheCU = I->second;
2444 // Start the dwarf pubnames section.
2445 Asm->OutStreamer.SwitchSection(
2446 Asm->getObjFileLowering().getDwarfPubNamesSection());
2448 Asm->OutStreamer.AddComment("Length of Public Names Info");
2449 Asm->EmitLabelDifference(
2450 Asm->GetTempSymbol("pubnames_end", TheCU->getID()),
2451 Asm->GetTempSymbol("pubnames_begin", TheCU->getID()), 4);
2453 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin",
2456 Asm->OutStreamer.AddComment("DWARF Version");
2457 Asm->EmitInt16(dwarf::DWARF_VERSION);
2459 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2460 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
2461 DwarfInfoSectionSym);
2463 Asm->OutStreamer.AddComment("Compilation Unit Length");
2464 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
2465 Asm->GetTempSymbol("info_begin", TheCU->getID()),
2468 const StringMap<DIE*> &Globals = TheCU->getGlobals();
2469 for (StringMap<DIE*>::const_iterator
2470 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2471 const char *Name = GI->getKeyData();
2472 DIE *Entity = GI->second;
2474 Asm->OutStreamer.AddComment("DIE offset");
2475 Asm->EmitInt32(Entity->getOffset());
2477 if (Asm->isVerbose())
2478 Asm->OutStreamer.AddComment("External Name");
2479 Asm->OutStreamer.EmitBytes(StringRef(Name, strlen(Name)+1), 0);
2482 Asm->OutStreamer.AddComment("End Mark");
2484 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_end",
2489 void DwarfDebug::emitDebugPubTypes() {
2490 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
2491 E = CUMap.end(); I != E; ++I) {
2492 CompileUnit *TheCU = I->second;
2493 // Start the dwarf pubnames section.
2494 Asm->OutStreamer.SwitchSection(
2495 Asm->getObjFileLowering().getDwarfPubTypesSection());
2496 Asm->OutStreamer.AddComment("Length of Public Types Info");
2497 Asm->EmitLabelDifference(
2498 Asm->GetTempSymbol("pubtypes_end", TheCU->getID()),
2499 Asm->GetTempSymbol("pubtypes_begin", TheCU->getID()), 4);
2501 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_begin",
2504 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DWARF Version");
2505 Asm->EmitInt16(dwarf::DWARF_VERSION);
2507 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
2508 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
2509 DwarfInfoSectionSym);
2511 Asm->OutStreamer.AddComment("Compilation Unit Length");
2512 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
2513 Asm->GetTempSymbol("info_begin", TheCU->getID()),
2516 const StringMap<DIE*> &Globals = TheCU->getGlobalTypes();
2517 for (StringMap<DIE*>::const_iterator
2518 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2519 const char *Name = GI->getKeyData();
2520 DIE * Entity = GI->second;
2522 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2523 Asm->EmitInt32(Entity->getOffset());
2525 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("External Name");
2526 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1), 0);
2529 Asm->OutStreamer.AddComment("End Mark");
2531 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_end",
2536 /// emitDebugStr - Emit visible names into a debug str section.
2538 void DwarfDebug::emitDebugStr() {
2539 // Check to see if it is worth the effort.
2540 if (StringPool.empty()) return;
2542 // Start the dwarf str section.
2543 Asm->OutStreamer.SwitchSection(
2544 Asm->getObjFileLowering().getDwarfStrSection());
2546 // Get all of the string pool entries and put them in an array by their ID so
2547 // we can sort them.
2548 SmallVector<std::pair<unsigned,
2549 StringMapEntry<std::pair<MCSymbol*, unsigned> >*>, 64> Entries;
2551 for (StringMap<std::pair<MCSymbol*, unsigned> >::iterator
2552 I = StringPool.begin(), E = StringPool.end(); I != E; ++I)
2553 Entries.push_back(std::make_pair(I->second.second, &*I));
2555 array_pod_sort(Entries.begin(), Entries.end());
2557 for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
2558 // Emit a label for reference from debug information entries.
2559 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
2561 // Emit the string itself.
2562 Asm->OutStreamer.EmitBytes(Entries[i].second->getKey(), 0/*addrspace*/);
2566 /// emitDebugLoc - Emit visible names into a debug loc section.
2568 void DwarfDebug::emitDebugLoc() {
2569 if (DotDebugLocEntries.empty())
2572 for (SmallVector<DotDebugLocEntry, 4>::iterator
2573 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2575 DotDebugLocEntry &Entry = *I;
2576 if (I + 1 != DotDebugLocEntries.end())
2580 // Start the dwarf loc section.
2581 Asm->OutStreamer.SwitchSection(
2582 Asm->getObjFileLowering().getDwarfLocSection());
2583 unsigned char Size = Asm->getTargetData().getPointerSize();
2584 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
2586 for (SmallVector<DotDebugLocEntry, 4>::iterator
2587 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
2588 I != E; ++I, ++index) {
2589 DotDebugLocEntry &Entry = *I;
2590 if (Entry.isMerged()) continue;
2591 if (Entry.isEmpty()) {
2592 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2593 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2594 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
2596 Asm->OutStreamer.EmitSymbolValue(Entry.Begin, Size, 0);
2597 Asm->OutStreamer.EmitSymbolValue(Entry.End, Size, 0);
2598 DIVariable DV(Entry.Variable);
2599 Asm->OutStreamer.AddComment("Loc expr size");
2600 MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
2601 MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
2602 Asm->EmitLabelDifference(end, begin, 2);
2603 Asm->OutStreamer.EmitLabel(begin);
2604 if (Entry.isConstant()) {
2605 DIBasicType BTy(DV.getType());
2607 (BTy.getEncoding() == dwarf::DW_ATE_signed
2608 || BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
2609 Asm->OutStreamer.AddComment("DW_OP_consts");
2610 Asm->EmitInt8(dwarf::DW_OP_consts);
2611 Asm->EmitSLEB128(Entry.getConstant());
2613 Asm->OutStreamer.AddComment("DW_OP_constu");
2614 Asm->EmitInt8(dwarf::DW_OP_constu);
2615 Asm->EmitULEB128(Entry.getConstant());
2617 } else if (DV.hasComplexAddress()) {
2618 unsigned N = DV.getNumAddrElements();
2620 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
2621 if (Entry.Loc.getOffset()) {
2623 Asm->EmitDwarfRegOp(Entry.Loc);
2624 Asm->OutStreamer.AddComment("DW_OP_deref");
2625 Asm->EmitInt8(dwarf::DW_OP_deref);
2626 Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
2627 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2628 Asm->EmitSLEB128(DV.getAddrElement(1));
2630 // If first address element is OpPlus then emit
2631 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
2632 MachineLocation Loc(Entry.Loc.getReg(), DV.getAddrElement(1));
2633 Asm->EmitDwarfRegOp(Loc);
2637 Asm->EmitDwarfRegOp(Entry.Loc);
2640 // Emit remaining complex address elements.
2641 for (; i < N; ++i) {
2642 uint64_t Element = DV.getAddrElement(i);
2643 if (Element == DIBuilder::OpPlus) {
2644 Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
2645 Asm->EmitULEB128(DV.getAddrElement(++i));
2646 } else if (Element == DIBuilder::OpDeref)
2647 Asm->EmitInt8(dwarf::DW_OP_deref);
2648 else llvm_unreachable("unknown Opcode found in complex address");
2652 Asm->EmitDwarfRegOp(Entry.Loc);
2654 Asm->OutStreamer.EmitLabel(end);
2659 /// EmitDebugARanges - Emit visible names into a debug aranges section.
2661 void DwarfDebug::EmitDebugARanges() {
2662 // Start the dwarf aranges section.
2663 Asm->OutStreamer.SwitchSection(
2664 Asm->getObjFileLowering().getDwarfARangesSection());
2667 /// emitDebugRanges - Emit visible names into a debug ranges section.
2669 void DwarfDebug::emitDebugRanges() {
2670 // Start the dwarf ranges section.
2671 Asm->OutStreamer.SwitchSection(
2672 Asm->getObjFileLowering().getDwarfRangesSection());
2673 unsigned char Size = Asm->getTargetData().getPointerSize();
2674 for (SmallVector<const MCSymbol *, 8>::iterator
2675 I = DebugRangeSymbols.begin(), E = DebugRangeSymbols.end();
2678 Asm->OutStreamer.EmitSymbolValue(const_cast<MCSymbol*>(*I), Size, 0);
2680 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
2684 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
2686 void DwarfDebug::emitDebugMacInfo() {
2687 if (const MCSection *LineInfo =
2688 Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
2689 // Start the dwarf macinfo section.
2690 Asm->OutStreamer.SwitchSection(LineInfo);
2694 /// emitDebugInlineInfo - Emit inline info using following format.
2696 /// 1. length of section
2697 /// 2. Dwarf version number
2698 /// 3. address size.
2700 /// Entries (one "entry" for each function that was inlined):
2702 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
2703 /// otherwise offset into __debug_str for regular function name.
2704 /// 2. offset into __debug_str section for regular function name.
2705 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
2706 /// instances for the function.
2708 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
2709 /// inlined instance; the die_offset points to the inlined_subroutine die in the
2710 /// __debug_info section, and the low_pc is the starting address for the
2711 /// inlining instance.
2712 void DwarfDebug::emitDebugInlineInfo() {
2713 if (!Asm->MAI->doesDwarfUsesInlineInfoSection())
2719 Asm->OutStreamer.SwitchSection(
2720 Asm->getObjFileLowering().getDwarfDebugInlineSection());
2722 Asm->OutStreamer.AddComment("Length of Debug Inlined Information Entry");
2723 Asm->EmitLabelDifference(Asm->GetTempSymbol("debug_inlined_end", 1),
2724 Asm->GetTempSymbol("debug_inlined_begin", 1), 4);
2726 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_begin", 1));
2728 Asm->OutStreamer.AddComment("Dwarf Version");
2729 Asm->EmitInt16(dwarf::DWARF_VERSION);
2730 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2731 Asm->EmitInt8(Asm->getTargetData().getPointerSize());
2733 for (SmallVector<const MDNode *, 4>::iterator I = InlinedSPNodes.begin(),
2734 E = InlinedSPNodes.end(); I != E; ++I) {
2736 const MDNode *Node = *I;
2737 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator II
2738 = InlineInfo.find(Node);
2739 SmallVector<InlineInfoLabels, 4> &Labels = II->second;
2740 DISubprogram SP(Node);
2741 StringRef LName = SP.getLinkageName();
2742 StringRef Name = SP.getName();
2744 Asm->OutStreamer.AddComment("MIPS linkage name");
2745 if (LName.empty()) {
2746 Asm->OutStreamer.EmitBytes(Name, 0);
2747 Asm->OutStreamer.EmitIntValue(0, 1, 0); // nul terminator.
2749 Asm->EmitSectionOffset(getStringPoolEntry(getRealLinkageName(LName)),
2750 DwarfStrSectionSym);
2752 Asm->OutStreamer.AddComment("Function name");
2753 Asm->EmitSectionOffset(getStringPoolEntry(Name), DwarfStrSectionSym);
2754 Asm->EmitULEB128(Labels.size(), "Inline count");
2756 for (SmallVector<InlineInfoLabels, 4>::iterator LI = Labels.begin(),
2757 LE = Labels.end(); LI != LE; ++LI) {
2758 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
2759 Asm->EmitInt32(LI->second->getOffset());
2761 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("low_pc");
2762 Asm->OutStreamer.EmitSymbolValue(LI->first,
2763 Asm->getTargetData().getPointerSize(),0);
2767 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_end", 1));