DwarfDebug.cpp revision 8594d429e02c688d428036f8563f09572da3fbff
1//===-- llvm/CodeGen/DwarfDebug.cpp - Dwarf Debug Framework ---------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file contains support for writing dwarf debug info into asm files. 11// 12//===----------------------------------------------------------------------===// 13 14#define DEBUG_TYPE "dwarfdebug" 15#include "DwarfDebug.h" 16#include "DIE.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" 46using namespace llvm; 47 48static cl::opt<bool> PrintDbgScope("print-dbgscope", cl::Hidden, 49 cl::desc("Print DbgScope information for each machine instruction")); 50 51static cl::opt<bool> DisableDebugInfoPrinting("disable-debug-info-print", 52 cl::Hidden, 53 cl::desc("Disable debug info printing")); 54 55static cl::opt<bool> UnknownLocations("use-unknown-locations", cl::Hidden, 56 cl::desc("Make an absence of debug location information explicit."), 57 cl::init(false)); 58 59namespace { 60 const char *DWARFGroupName = "DWARF Emission"; 61 const char *DbgTimerName = "DWARF Debug Writer"; 62} // end anonymous namespace 63 64//===----------------------------------------------------------------------===// 65 66/// Configuration values for initial hash set sizes (log2). 67/// 68static const unsigned InitAbbreviationsSetSize = 9; // log2(512) 69 70namespace llvm { 71 72DIType DbgVariable::getType() const { 73 DIType Ty = Var.getType(); 74 // FIXME: isBlockByrefVariable should be reformulated in terms of complex 75 // addresses instead. 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. 83 84 However, as far as the original *programmer* is concerned, the 85 variable should still have type 'SomeType', as originally declared. 86 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. 92 93 The original type 'SomeType' will be the type of the field named 94 'VarName' inside the __Block_byref_x_VarName struct. 95 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. */ 101 DIType subType = Ty; 102 unsigned tag = Ty.getTag(); 103 104 if (tag == dwarf::DW_TAG_pointer_type) { 105 DIDerivedType DTy = DIDerivedType(Ty); 106 subType = DTy.getTypeDerivedFrom(); 107 } 108 109 DICompositeType blockStruct = DICompositeType(subType); 110 DIArray Elements = blockStruct.getTypeArray(); 111 112 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()); 117 } 118 return Ty; 119 } 120 return Ty; 121} 122 123//===----------------------------------------------------------------------===// 124/// DbgRange - This is used to track range of instructions with identical 125/// debug info scope. 126/// 127typedef std::pair<const MachineInstr *, const MachineInstr *> DbgRange; 128 129//===----------------------------------------------------------------------===// 130/// DbgScope - This class is used to track scope information. 131/// 132class DbgScope { 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; 148public: 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) {} 153 virtual ~DbgScope(); 154 155 // Accessors. 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; } 164 165 /// openInsnRange - This scope covers instruction range starting from MI. 166 void openInsnRange(const MachineInstr *MI) { 167 if (!FirstInsn) 168 FirstInsn = MI; 169 170 if (Parent) 171 Parent->openInsnRange(MI); 172 } 173 174 /// extendInsnRange - Extend the current instruction range covered by 175 /// this scope. 176 void extendInsnRange(const MachineInstr *MI) { 177 assert (FirstInsn && "MI Range is not open!"); 178 LastInsn = MI; 179 if (Parent) 180 Parent->extendInsnRange(MI); 181 } 182 183 /// 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)); 189 FirstInsn = NULL; 190 LastInsn = NULL; 191 // If Parent dominates NewScope then do not close Parent's instruction 192 // range. 193 if (Parent && (!NewScope || !Parent->dominates(NewScope))) 194 Parent->closeInsnRange(NewScope); 195 } 196 197 void setAbstractScope() { AbstractScope = true; } 198 bool isAbstractScope() const { return AbstractScope; } 199 200 // 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) { 206 if (S == this) 207 return true; 208 if (DFSIn < S->getDFSIn() && DFSOut > S->getDFSOut()) 209 return true; 210 return false; 211 } 212 213 /// addScope - Add a scope to the scope. 214 /// 215 void addScope(DbgScope *S) { Scopes.push_back(S); } 216 217 /// addVariable - Add a variable to the scope. 218 /// 219 void addVariable(DbgVariable *V) { Variables.push_back(V); } 220 221#ifndef NDEBUG 222 void dump() const; 223#endif 224}; 225 226} // end llvm namespace 227 228#ifndef NDEBUG 229void DbgScope::dump() const { 230 raw_ostream &err = dbgs(); 231 err.indent(IndentLevel); 232 const MDNode *N = Desc; 233 N->dump(); 234 if (AbstractScope) 235 err << "Abstract Scope\n"; 236 237 IndentLevel += 2; 238 if (!Scopes.empty()) 239 err << "Children ...\n"; 240 for (unsigned i = 0, e = Scopes.size(); i != e; ++i) 241 if (Scopes[i] != this) 242 Scopes[i]->dump(); 243 244 IndentLevel -= 2; 245} 246#endif 247 248DbgScope::~DbgScope() { 249 for (unsigned j = 0, M = Variables.size(); j < M; ++j) 250 delete Variables[j]; 251} 252 253DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M) 254 : Asm(A), MMI(Asm->MMI), FirstCU(0), 255 AbbreviationsSet(InitAbbreviationsSetSize), 256 CurrentFnDbgScope(0), PrevLabel(NULL) { 257 NextStringPoolNumber = 0; 258 259 DwarfInfoSectionSym = DwarfAbbrevSectionSym = 0; 260 DwarfStrSectionSym = TextSectionSym = 0; 261 DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = 0; 262 FunctionBeginSym = FunctionEndSym = 0; 263 { 264 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled); 265 beginModule(M); 266 } 267} 268DwarfDebug::~DwarfDebug() { 269} 270 271MCSymbol *DwarfDebug::getStringPoolEntry(StringRef Str) { 272 std::pair<MCSymbol*, unsigned> &Entry = StringPool[Str]; 273 if (Entry.first) return Entry.first; 274 275 Entry.second = NextStringPoolNumber++; 276 return Entry.first = Asm->GetTempSymbol("string", Entry.second); 277} 278 279 280/// assignAbbrevNumber - Define a unique number for the abbreviation. 281/// 282void DwarfDebug::assignAbbrevNumber(DIEAbbrev &Abbrev) { 283 // Profile the node so that we can make it unique. 284 FoldingSetNodeID ID; 285 Abbrev.Profile(ID); 286 287 // Check the set for priors. 288 DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev); 289 290 // If it's newly added. 291 if (InSet == &Abbrev) { 292 // Add to abbreviation list. 293 Abbreviations.push_back(&Abbrev); 294 295 // Assign the vector position + 1 as its number. 296 Abbrev.setNumber(Abbreviations.size()); 297 } else { 298 // Assign existing abbreviation number. 299 Abbrev.setNumber(InSet->getNumber()); 300 } 301} 302 303/// 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. 306static StringRef getRealLinkageName(StringRef LinkageName) { 307 char One = '\1'; 308 if (LinkageName.startswith(StringRef(&One, 1))) 309 return LinkageName.substr(1); 310 return LinkageName; 311} 312 313/// createSubprogramDIE - Create new DIE using SP. 314DIE *DwarfDebug::createSubprogramDIE(DISubprogram SP) { 315 CompileUnit *SPCU = getCompileUnit(SP); 316 DIE *SPDie = SPCU->getDIE(SP); 317 if (SPDie) 318 return SPDie; 319 320 SPDie = new DIE(dwarf::DW_TAG_subprogram); 321 322 // DW_TAG_inlined_subroutine may refer to this DIE. 323 SPCU->insertDIE(SP, SPDie); 324 325 // Add to context owner. 326 SPCU->addToContextOwner(SPDie, SP.getContext()); 327 328 // Add function template parameters. 329 SPCU->addTemplateParams(*SPDie, SP.getTemplateParams()); 330 331 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)); 335 336 // 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()) 339 return SPDie; 340 341 // 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, 344 SP.getName()); 345 346 SPCU->addSourceLine(SPDie, SP); 347 348 if (SP.isPrototyped()) 349 SPCU->addUInt(SPDie, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1); 350 351 // Add Return Type. 352 DICompositeType SPTy = SP.getType(); 353 DIArray Args = SPTy.getTypeArray(); 354 unsigned SPTag = SPTy.getTag(); 355 356 if (Args.getNumElements() == 0 || SPTag != dwarf::DW_TAG_subroutine_type) 357 SPCU->addType(SPDie, SPTy); 358 else 359 SPCU->addType(SPDie, DIType(Args.getElement(0))); 360 361 unsigned VK = SP.getVirtuality(); 362 if (VK) { 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())); 370 } 371 372 if (!SP.isDefinition()) { 373 SPCU->addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1); 374 375 // 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(); 380 381 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); 389 } 390 } 391 392 if (SP.isArtificial()) 393 SPCU->addUInt(SPDie, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1); 394 395 if (!SP.isLocalToUnit()) 396 SPCU->addUInt(SPDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1); 397 398 if (SP.isOptimized()) 399 SPCU->addUInt(SPDie, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1); 400 401 if (unsigned isa = Asm->getISAEncoding()) { 402 SPCU->addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa); 403 } 404 405 return SPDie; 406} 407 408DbgScope *DwarfDebug::getOrCreateAbstractScope(const MDNode *N) { 409 assert(N && "Invalid Scope encoding!"); 410 411 DbgScope *AScope = AbstractScopes.lookup(N); 412 if (AScope) 413 return AScope; 414 415 DbgScope *Parent = NULL; 416 417 DIDescriptor Scope(N); 418 if (Scope.isLexicalBlock()) { 419 DILexicalBlock DB(N); 420 DIDescriptor ParentDesc = DB.getContext(); 421 Parent = getOrCreateAbstractScope(ParentDesc); 422 } 423 424 AScope = new DbgScope(Parent, DIDescriptor(N), NULL); 425 426 if (Parent) 427 Parent->addScope(AScope); 428 AScope->setAbstractScope(); 429 AbstractScopes[N] = AScope; 430 if (DIDescriptor(N).isSubprogram()) 431 AbstractScopesList.push_back(AScope); 432 return AScope; 433} 434 435/// isSubprogramContext - Return true if Context is either a subprogram 436/// or another context nested inside a subprogram. 437static bool isSubprogramContext(const MDNode *Context) { 438 if (!Context) 439 return false; 440 DIDescriptor D(Context); 441 if (D.isSubprogram()) 442 return true; 443 if (D.isType()) 444 return isSubprogramContext(DIType(Context).getContext()); 445 return false; 446} 447 448/// 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. 452DIE *DwarfDebug::updateSubprogramScopeDIE(const MDNode *SPNode) { 453 CompileUnit *SPCU = getCompileUnit(SPNode); 454 DIE *SPDie = SPCU->getDIE(SPNode); 455 456 assert(SPDie && "Unable to find subprogram DIE!"); 457 DISubprogram SP(SPNode); 458 459 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)); 464 else { 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); 474 475 // Add arguments. 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); 487 } 488 DIE *SPDeclDie = SPDie; 489 SPDie = new DIE(dwarf::DW_TAG_subprogram); 490 SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification, dwarf::DW_FORM_ref4, 491 SPDeclDie); 492 SPCU->addDie(SPDie); 493 } 494 } 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); 500 SPCU->addDie(SPDie); 501 } 502 503 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); 510 511 return SPDie; 512} 513 514/// constructLexicalScope - Construct new DW_TAG_lexical_block 515/// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels. 516DIE *DwarfDebug::constructLexicalScopeDIE(DbgScope *Scope) { 517 518 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_lexical_block); 519 if (Scope->isAbstractScope()) 520 return ScopeDIE; 521 522 const SmallVector<DbgRange, 4> &Ranges = Scope->getRanges(); 523 if (Ranges.empty()) 524 return 0; 525 526 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)); 538 } 539 DebugRangeSymbols.push_back(NULL); 540 DebugRangeSymbols.push_back(NULL); 541 return ScopeDIE; 542 } 543 544 const MCSymbol *Start = getLabelBeforeInsn(RI->first); 545 const MCSymbol *End = getLabelAfterInsn(RI->second); 546 547 if (End == 0) return 0; 548 549 assert(Start->isDefined() && "Invalid starting label for an inlined scope!"); 550 assert(End->isDefined() && "Invalid end label for an inlined scope!"); 551 552 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); 554 555 return ScopeDIE; 556} 557 558/// constructInlinedScopeDIE - This scope represents inlined body of 559/// a function. Construct DIE to represent this concrete inlined copy 560/// of the function. 561DIE *DwarfDebug::constructInlinedScopeDIE(DbgScope *Scope) { 562 563 const SmallVector<DbgRange, 4> &Ranges = Scope->getRanges(); 564 assert (Ranges.empty() == false 565 && "DbgScope does not have instruction markers!"); 566 567 // 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); 574 575 if (StartLabel == 0 || EndLabel == 0) { 576 assert (0 && "Unexpected Start and End labels for a inlined scope!"); 577 return 0; 578 } 579 assert(StartLabel->isDefined() && 580 "Invalid starting label for an inlined scope!"); 581 assert(EndLabel->isDefined() && 582 "Invalid end label for an inlined scope!"); 583 584 if (!Scope->getScopeNode()) 585 return NULL; 586 DIScope DS(Scope->getScopeNode()); 587 DISubprogram InlinedSP = getDISubprogram(DS); 588 CompileUnit *TheCU = getCompileUnit(InlinedSP); 589 DIE *OriginDIE = TheCU->getDIE(InlinedSP); 590 if (!OriginDIE) { 591 DEBUG(dbgs() << "Unable to find original DIE for inlined subprogram."); 592 return NULL; 593 } 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); 597 598 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); 600 601 InlinedSubprogramDIEs.insert(OriginDIE); 602 603 // Track the start label for this inlined function. 604 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator 605 I = InlineInfo.find(InlinedSP); 606 607 if (I == InlineInfo.end()) { 608 InlineInfo[InlinedSP].push_back(std::make_pair(StartLabel, 609 ScopeDIE)); 610 InlinedSPNodes.push_back(InlinedSP); 611 } else 612 I->second.push_back(std::make_pair(StartLabel, ScopeDIE)); 613 614 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()); 617 618 return ScopeDIE; 619} 620 621/// isUnsignedDIType - Return true if type encoding is unsigned. 622static bool isUnsignedDIType(DIType Ty) { 623 DIDerivedType DTy(Ty); 624 if (DTy.Verify()) 625 return isUnsignedDIType(DTy.getTypeDerivedFrom()); 626 627 DIBasicType BTy(Ty); 628 if (BTy.Verify()) { 629 unsigned Encoding = BTy.getEncoding(); 630 if (Encoding == dwarf::DW_ATE_unsigned || 631 Encoding == dwarf::DW_ATE_unsigned_char) 632 return true; 633 } 634 return false; 635} 636 637/// constructVariableDIE - Construct a DIE for the given DbgVariable. 638DIE *DwarfDebug::constructVariableDIE(DbgVariable *DV, DbgScope *Scope) { 639 StringRef Name = DV->getName(); 640 if (Name.empty()) 641 return NULL; 642 643 // Translate tag to proper Dwarf tag. The result variable is dropped for 644 // now. 645 unsigned Tag; 646 switch (DV->getTag()) { 647 case dwarf::DW_TAG_return_variable: 648 return NULL; 649 case dwarf::DW_TAG_arg_variable: 650 Tag = dwarf::DW_TAG_formal_parameter; 651 break; 652 case dwarf::DW_TAG_auto_variable: // fall thru 653 default: 654 Tag = dwarf::DW_TAG_variable; 655 break; 656 } 657 658 // Define variable debug information entry. 659 DIE *VariableDie = new DIE(Tag); 660 CompileUnit *VariableCU = getCompileUnit(DV->getVariable()); 661 DIE *AbsDIE = NULL; 662 DenseMap<const DbgVariable *, const DbgVariable *>::iterator 663 V2AVI = VarToAbstractVarMap.find(DV); 664 if (V2AVI != VarToAbstractVarMap.end()) 665 AbsDIE = V2AVI->second->getDIE(); 666 667 if (AbsDIE) 668 VariableCU->addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin, 669 dwarf::DW_FORM_ref4, AbsDIE); 670 else { 671 VariableCU->addString(VariableDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, 672 Name); 673 VariableCU->addSourceLine(VariableDie, DV->getVariable()); 674 675 // Add variable type. 676 VariableCU->addType(VariableDie, DV->getType()); 677 } 678 679 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); 685 686 if (Scope->isAbstractScope()) { 687 DV->setDIE(VariableDie); 688 return VariableDie; 689 } 690 691 // Add variable address. 692 693 unsigned Offset = DV->getDotDebugLocOffset(); 694 if (Offset != ~0U) { 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); 699 return VariableDie; 700 } 701 702 // 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(); 717 int Offset = 718 TFI->getFrameIndexReference(*Asm->MF, 719 DVInsn->getOperand(1).getImm(), 720 FrameReg); 721 MachineLocation Location(FrameReg, Offset); 722 VariableCU->addVariableAddress(DV, VariableDie, Location); 723 724 } else if (RegOp.getReg()) 725 VariableCU->addVariableAddress(DV, VariableDie, 726 MachineLocation(RegOp.getReg())); 727 updated = true; 728 } 729 else if (DVInsn->getOperand(0).isImm()) 730 updated = 731 VariableCU->addConstantValue(VariableDie, DVInsn->getOperand(0), 732 DV->getType()); 733 else if (DVInsn->getOperand(0).isFPImm()) 734 updated = 735 VariableCU->addConstantFPValue(VariableDie, DVInsn->getOperand(0)); 736 else if (DVInsn->getOperand(0).isCImm()) 737 updated = 738 VariableCU->addConstantValue(VariableDie, 739 DVInsn->getOperand(0).getCImm(), 740 isUnsignedDIType(DV->getType())); 741 } else { 742 VariableCU->addVariableAddress(DV, VariableDie, 743 Asm->getDebugValueLocation(DVInsn)); 744 updated = true; 745 } 746 if (!updated) { 747 // If variableDie is not updated then DBG_VALUE instruction does not 748 // have valid variable info. 749 delete VariableDie; 750 return NULL; 751 } 752 DV->setDIE(VariableDie); 753 return VariableDie; 754 } 755 756 // .. else use frame index, if available. 757 int FI = 0; 758 if (findVariableFrameIndex(DV, &FI)) { 759 unsigned FrameReg = 0; 760 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering(); 761 int Offset = 762 TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg); 763 MachineLocation Location(FrameReg, Offset); 764 VariableCU->addVariableAddress(DV, VariableDie, Location); 765 } 766 767 DV->setDIE(VariableDie); 768 return VariableDie; 769 770} 771 772/// constructScopeDIE - Construct a DIE for this scope. 773DIE *DwarfDebug::constructScopeDIE(DbgScope *Scope) { 774 if (!Scope || !Scope->getScopeNode()) 775 return NULL; 776 777 SmallVector <DIE *, 8> Children; 778 779 // 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); 785 786 // 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. 804 if (ScopeDIE) 805 AbstractSPDies.insert(std::make_pair(DS, ScopeDIE)); 806 } 807 else 808 ScopeDIE = updateSubprogramScopeDIE(DS); 809 } 810 else { 811 // There is no need to emit empty lexical block DIE. 812 if (Children.empty()) 813 return NULL; 814 ScopeDIE = constructLexicalScopeDIE(Scope); 815 } 816 817 if (!ScopeDIE) return NULL; 818 819 // Add children 820 for (SmallVector<DIE *, 8>::iterator I = Children.begin(), 821 E = Children.end(); I != E; ++I) 822 ScopeDIE->addChild(*I); 823 824 if (DS.isSubprogram()) 825 getCompileUnit(DS)->addPubTypes(DISubprogram(DS)); 826 827 return ScopeDIE; 828} 829 830/// 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 833/// maps as well. 834 835unsigned DwarfDebug::GetOrCreateSourceID(StringRef FileName, 836 StringRef DirName) { 837 // If FE did not provide a file name, then assume stdin. 838 if (FileName.empty()) 839 return GetOrCreateSourceID("<stdin>", StringRef()); 840 841 // 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()); 847 } 848 849 StringMapEntry<unsigned> &Entry = SourceIdMap.GetOrCreateValue(FileName); 850 if (Entry.getValue()) 851 return Entry.getValue(); 852 853 unsigned SrcId = SourceIdMap.size(); 854 Entry.setValue(SrcId); 855 856 // Print out a .file directive to specify files for .loc directives. 857 Asm->OutStreamer.EmitDwarfFileDirective(SrcId, Entry.getKey()); 858 859 return SrcId; 860} 861 862/// constructCompileUnit - Create new CompileUnit for the given 863/// metadata node with tag DW_TAG_compile_unit. 864void 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); 869 870 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")); 885 else 886 NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0); 887 888 if (!Dir.empty()) 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); 892 893 StringRef Flags = DIUnit.getFlags(); 894 if (!Flags.empty()) 895 NewCU->addString(Die, dwarf::DW_AT_APPLE_flags, dwarf::DW_FORM_string, Flags); 896 897 unsigned RVer = DIUnit.getRunTimeVersion(); 898 if (RVer) 899 NewCU->addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers, 900 dwarf::DW_FORM_data1, RVer); 901 902 if (!FirstCU) 903 FirstCU = NewCU; 904 CUMap.insert(std::make_pair(N, NewCU)); 905} 906 907/// getCompielUnit - Get CompileUnit DIE. 908CompileUnit *DwarfDebug::getCompileUnit(const MDNode *N) const { 909 assert (N && "Invalid DwarfDebug::getCompileUnit argument!"); 910 DIDescriptor D(N); 911 const MDNode *CUNode = NULL; 912 if (D.isCompileUnit()) 913 CUNode = N; 914 else if (D.isSubprogram()) 915 CUNode = DISubprogram(N).getCompileUnit(); 916 else if (D.isType()) 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(); 924 else if (D.isFile()) 925 CUNode = DIFile(N).getCompileUnit(); 926 else 927 return FirstCU; 928 929 DenseMap<const MDNode *, CompileUnit *>::const_iterator I 930 = CUMap.find(CUNode); 931 if (I == CUMap.end()) 932 return FirstCU; 933 return I->second; 934} 935 936// Return const exprssion if value is a GEP to access merged global 937// constant. e.g. 938// i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0) 939static 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) 943 return NULL; 944 945 // First operand points to a global value. 946 if (!isa<GlobalValue>(CE->getOperand(0))) 947 return NULL; 948 949 // Second operand is zero. 950 const ConstantInt *CI = 951 dyn_cast_or_null<ConstantInt>(CE->getOperand(1)); 952 if (!CI || !CI->isZero()) 953 return NULL; 954 955 // Third operand is offset. 956 if (!isa<ConstantInt>(CE->getOperand(2))) 957 return NULL; 958 959 return CE; 960} 961 962/// constructGlobalVariableDIE - Construct global variable DIE. 963void DwarfDebug::constructGlobalVariableDIE(const MDNode *N) { 964 DIGlobalVariable GV(N); 965 966 // If debug information is malformed then ignore it. 967 if (GV.Verify() == false) 968 return; 969 970 // Check for pre-existence. 971 CompileUnit *TheCU = getCompileUnit(N); 972 if (TheCU->getDIE(GV)) 973 return; 974 975 DIType GTy = GV.getType(); 976 DIE *VariableDIE = new DIE(GV.getTag()); 977 978 bool isGlobalVariable = GV.getGlobal() != NULL; 979 980 // Add name. 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)); 988 // Add type. 989 TheCU->addType(VariableDIE, GTy); 990 991 // Add scoping info. 992 if (!GV.isLocalToUnit()) { 993 TheCU->addUInt(VariableDIE, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1); 994 // Expose as global. 995 TheCU->addGlobal(GV.getName(), VariableDIE); 996 } 997 // Add line number info. 998 TheCU->addSourceLine(VariableDIE, GV); 999 // Add to map. 1000 TheCU->insertDIE(N, VariableDIE); 1001 // Add to context owner. 1002 DIDescriptor GVContext = GV.getContext(); 1003 TheCU->addToContextOwner(VariableDIE, GVContext); 1004 // Add location. 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 1011 // or a subprogram. 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); 1021 } else { 1022 TheCU->addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block); 1023 } 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); 1038 } 1039 1040 return; 1041} 1042 1043/// construct SubprogramDIE - Construct subprogram DIE. 1044void DwarfDebug::constructSubprogramDIE(const MDNode *N) { 1045 DISubprogram SP(N); 1046 1047 // Check for pre-existence. 1048 CompileUnit *TheCU = getCompileUnit(N); 1049 if (TheCU->getDIE(N)) 1050 return; 1051 1052 if (!SP.isDefinition()) 1053 // This is a method declaration which will be handled while constructing 1054 // class type. 1055 return; 1056 1057 DIE *SubprogramDie = createSubprogramDIE(SP); 1058 1059 // Add to map. 1060 TheCU->insertDIE(N, SubprogramDie); 1061 1062 // Add to context owner. 1063 TheCU->addToContextOwner(SubprogramDie, SP.getContext()); 1064 1065 // Expose as global. 1066 TheCU->addGlobal(SP.getName(), SubprogramDie); 1067 1068 return; 1069} 1070 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. 1074void DwarfDebug::beginModule(Module *M) { 1075 if (DisableDebugInfoPrinting) 1076 return; 1077 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"); 1081 if (CU_Nodes) { 1082 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. 1088 return; 1089 1090 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) 1091 constructCompileUnit(CU_Nodes->getOperand(i)); 1092 1093 if (GV_Nodes) 1094 for (unsigned i = 0, e = GV_Nodes->getNumOperands(); i != e; ++i) 1095 constructGlobalVariableDIE(GV_Nodes->getOperand(i)); 1096 1097 if (SP_Nodes) 1098 for (unsigned i = 0, e = SP_Nodes->getNumOperands(); i != e; ++i) 1099 constructSubprogramDIE(SP_Nodes->getOperand(i)); 1100 1101 } else { 1102 1103 DebugInfoFinder DbgFinder; 1104 DbgFinder.processModule(*M); 1105 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; 1113 break; 1114 } 1115 } 1116 if (!HasDebugInfo) return; 1117 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); 1122 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); 1127 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); 1132 } 1133 1134 // Tell MMI that we have debug info. 1135 MMI->setDebugInfoAvailability(true); 1136 1137 // Emit initial sections. 1138 EmitSectionLabels(); 1139 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); 1145 } 1146 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); 1151 } 1152 1153 // Prime section data. 1154 SectionMap.insert(Asm->getObjFileLowering().getTextSection()); 1155} 1156 1157/// endModule - Emit all Dwarf sections that should come after the content. 1158/// 1159void 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; 1168 1169 // Collect info for variables that were optimized out. 1170 if (!SP.isDefinition()) continue; 1171 StringRef FName = SP.getLinkageName(); 1172 if (FName.empty()) 1173 FName = SP.getName(); 1174 NamedMDNode *NMD = getFnSpecificMDNode(*(MMI->getModule()), FName); 1175 if (!NMD) continue; 1176 unsigned E = NMD->getNumOperands(); 1177 if (!E) continue; 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)); 1184 } 1185 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); 1192 if (VariableDIE) 1193 ScopeDIE->addChild(VariableDIE); 1194 } 1195 } 1196 } 1197 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) { 1201 DIE *ISP = *AI; 1202 FirstCU->addUInt(ISP, dwarf::DW_AT_inline, 0, dwarf::DW_INL_inlined); 1203 } 1204 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); 1209 if (!N) continue; 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); 1214 } 1215 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")); 1221 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)); 1226 } 1227 1228 // Compute DIE offsets and sizes. 1229 computeSizeAndOffsets(); 1230 1231 // Emit all the DIEs into a debug info section 1232 emitDebugInfo(); 1233 1234 // Corresponding abbreviations into a abbrev section. 1235 emitAbbreviations(); 1236 1237 // Emit info into a debug pubnames section. 1238 emitDebugPubNames(); 1239 1240 // Emit info into a debug pubtypes section. 1241 emitDebugPubTypes(); 1242 1243 // Emit info into a debug loc section. 1244 emitDebugLoc(); 1245 1246 // Emit info into a debug aranges section. 1247 EmitDebugARanges(); 1248 1249 // Emit info into a debug ranges section. 1250 emitDebugRanges(); 1251 1252 // Emit info into a debug macinfo section. 1253 emitDebugMacInfo(); 1254 1255 // Emit inline info. 1256 emitDebugInlineInfo(); 1257 1258 // Emit info into a debug str section. 1259 emitDebugStr(); 1260 1261 // clean up. 1262 DeleteContainerSeconds(DeadFnScopeMap); 1263 for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(), 1264 E = CUMap.end(); I != E; ++I) 1265 delete I->second; 1266 FirstCU = NULL; // Reset for the next Module, if any. 1267} 1268 1269/// findAbstractVariable - Find abstract variable, if any, associated with Var. 1270DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &Var, 1271 DebugLoc ScopeLoc) { 1272 1273 DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var); 1274 if (AbsDbgVariable) 1275 return AbsDbgVariable; 1276 1277 LLVMContext &Ctx = Var->getContext(); 1278 DbgScope *Scope = AbstractScopes.lookup(ScopeLoc.getScope(Ctx)); 1279 if (!Scope) 1280 return NULL; 1281 1282 AbsDbgVariable = new DbgVariable(Var); 1283 Scope->addVariable(AbsDbgVariable); 1284 AbstractVariables[Var] = AbsDbgVariable; 1285 return AbsDbgVariable; 1286} 1287 1288/// addCurrentFnArgument - If Var is an current function argument that add 1289/// it in CurrentFnArguments list. 1290bool DwarfDebug::addCurrentFnArgument(const MachineFunction *MF, 1291 DbgVariable *Var, DbgScope *Scope) { 1292 if (Scope != CurrentFnDbgScope) 1293 return false; 1294 DIVariable DV = Var->getVariable(); 1295 if (DV.getTag() != dwarf::DW_TAG_arg_variable) 1296 return false; 1297 unsigned ArgNo = DV.getArgNumber(); 1298 if (ArgNo == 0) 1299 return false; 1300 1301 size_t Size = CurrentFnArguments.size(); 1302 if (Size == 0) 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. 1306 if (ArgNo > Size) 1307 CurrentFnArguments.resize(ArgNo * 2); 1308 CurrentFnArguments[ArgNo - 1] = Var; 1309 return true; 1310} 1311 1312/// collectVariableInfoFromMMITable - Collect variable information from 1313/// side table maintained by MMI. 1314void 1315DwarfDebug::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; 1322 if (!Var) continue; 1323 Processed.insert(Var); 1324 DIVariable DV(Var); 1325 const std::pair<unsigned, DebugLoc> &VP = VI->second; 1326 1327 DbgScope *Scope = 0; 1328 if (const MDNode *IA = VP.second.getInlinedAt(Ctx)) 1329 Scope = ConcreteScopes.lookup(IA); 1330 if (Scope == 0) 1331 Scope = DbgScopeMap.lookup(VP.second.getScope(Ctx)); 1332 1333 // If variable scope is not found then skip this variable. 1334 if (Scope == 0) 1335 continue; 1336 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; 1345 } 1346 } 1347} 1348 1349/// isDbgValueInDefinedReg - Return true if debug value, encoded by 1350/// DBG_VALUE instruction, is in a defined reg. 1351static 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; 1356} 1357 1358/// collectVariableInfo - Populate DbgScope entries with variables' info. 1359void 1360DwarfDebug::collectVariableInfo(const MachineFunction *MF, 1361 SmallPtrSet<const MDNode *, 16> &Processed) { 1362 1363 /// collection info from MMI table. 1364 collectVariableInfoFromMMITable(MF, Processed); 1365 1366 for (SmallVectorImpl<const MDNode*>::const_iterator 1367 UVI = UserVariables.begin(), UVE = UserVariables.end(); UVI != UVE; 1368 ++UVI) { 1369 const MDNode *Var = *UVI; 1370 if (Processed.count(Var)) 1371 continue; 1372 1373 // History contains relevant DBG_VALUE instructions for Var and instructions 1374 // clobbering it. 1375 SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var]; 1376 if (History.empty()) 1377 continue; 1378 const MachineInstr *MInsn = History.front(); 1379 1380 DIVariable DV(Var); 1381 DbgScope *Scope = NULL; 1382 if (DV.getTag() == dwarf::DW_TAG_arg_variable && 1383 DISubprogram(DV.getContext()).describes(MF->getFunction())) 1384 Scope = CurrentFnDbgScope; 1385 else 1386 Scope = findDbgScope(MInsn); 1387 // If variable scope is not found then skip this variable. 1388 if (!Scope) 1389 continue; 1390 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; 1399 } 1400 1401 // Simple ranges that are fully coalesced. 1402 if (History.size() <= 1 || (History.size() == 2 && 1403 MInsn->isIdenticalTo(History.back()))) { 1404 DbgVariableToDbgInstMap[RegVar] = MInsn; 1405 continue; 1406 } 1407 1408 // handle multiple DBG_VALUE instructions describing one variable. 1409 RegVar->setDotDebugLocOffset(DotDebugLocEntries.size()); 1410 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"); 1415 1416 // Check if DBG_VALUE is truncating a range. 1417 if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg() 1418 && !Begin->getOperand(0).getReg()) 1419 continue; 1420 1421 // Compute the range for a register location. 1422 const MCSymbol *FLabel = getLabelBeforeInsn(Begin); 1423 const MCSymbol *SLabel = 0; 1424 1425 if (HI + 1 == HE) 1426 // If Begin is the last instruction in History then its value is valid 1427 // until the end of the function. 1428 SLabel = FunctionEndSym; 1429 else { 1430 const MachineInstr *End = HI[1]; 1431 if (End->isDebugValue()) 1432 SLabel = getLabelBeforeInsn(End); 1433 else { 1434 // End is a normal instruction clobbering the range. 1435 SLabel = getLabelAfterInsn(End); 1436 assert(SLabel && "Forgot label after clobber instruction"); 1437 ++HI; 1438 } 1439 } 1440 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()); 1447 DotDebugLocEntries. 1448 push_back(DotDebugLocEntry(FLabel, SLabel, MLoc, Var)); 1449 } 1450 // FIXME: Handle isFPImm also. 1451 else if (Begin->getOperand(0).isImm()) { 1452 DotDebugLocEntries. 1453 push_back(DotDebugLocEntry(FLabel, SLabel, 1454 Begin->getOperand(0).getImm())); 1455 } 1456 } else { 1457 MLoc = Asm->getDebugValueLocation(Begin); 1458 DotDebugLocEntries. 1459 push_back(DotDebugLocEntry(FLabel, SLabel, MLoc, Var)); 1460 } 1461 } 1462 DotDebugLocEntries.push_back(DotDebugLocEntry()); 1463 } 1464 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)) 1471 continue; 1472 DbgScope *Scope = DbgScopeMap.lookup(DV.getContext()); 1473 if (Scope) 1474 Scope->addVariable(new DbgVariable(DV)); 1475 } 1476 } 1477} 1478 1479/// getLabelBeforeInsn - Return Label preceding the instruction. 1480const MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) { 1481 MCSymbol *Label = LabelsBeforeInsn.lookup(MI); 1482 assert(Label && "Didn't insert label before instruction"); 1483 return Label; 1484} 1485 1486/// getLabelAfterInsn - Return Label immediately following the instruction. 1487const MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) { 1488 return LabelsAfterInsn.lookup(MI); 1489} 1490 1491/// beginInstruction - Process beginning of an instruction. 1492void 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; 1498 PrevInstLoc = DL; 1499 if (DL == PrologEndLoc) { 1500 Flags |= DWARF2_FLAG_PROLOGUE_END; 1501 PrologEndLoc = DebugLoc(); 1502 } 1503 if (!DL.isUnknown()) { 1504 const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext()); 1505 recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags); 1506 } else 1507 recordSourceLine(0, 0, 0, 0); 1508 } 1509 } 1510 1511 // Insert labels where requested. 1512 DenseMap<const MachineInstr*, MCSymbol*>::iterator I = 1513 LabelsBeforeInsn.find(MI); 1514 1515 // No label needed. 1516 if (I == LabelsBeforeInsn.end()) 1517 return; 1518 1519 // Label already assigned. 1520 if (I->second) 1521 return; 1522 1523 if (!PrevLabel) { 1524 PrevLabel = MMI->getContext().CreateTempSymbol(); 1525 Asm->OutStreamer.EmitLabel(PrevLabel); 1526 } 1527 I->second = PrevLabel; 1528} 1529 1530/// endInstruction - Process end of an instruction. 1531void 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()) 1535 PrevLabel = 0; 1536 1537 DenseMap<const MachineInstr*, MCSymbol*>::iterator I = 1538 LabelsAfterInsn.find(MI); 1539 1540 // No label needed. 1541 if (I == LabelsAfterInsn.end()) 1542 return; 1543 1544 // Label already assigned. 1545 if (I->second) 1546 return; 1547 1548 // We need a label after this instruction. 1549 if (!PrevLabel) { 1550 PrevLabel = MMI->getContext().CreateTempSymbol(); 1551 Asm->OutStreamer.EmitLabel(PrevLabel); 1552 } 1553 I->second = PrevLabel; 1554} 1555 1556/// getOrCreateDbgScope - Create DbgScope for the scope. 1557DbgScope *DwarfDebug::getOrCreateDbgScope(const MDNode *Scope, 1558 const MDNode *InlinedAt) { 1559 if (!InlinedAt) { 1560 DbgScope *WScope = DbgScopeMap.lookup(Scope); 1561 if (WScope) 1562 return WScope; 1563 WScope = new DbgScope(NULL, DIDescriptor(Scope), NULL); 1564 DbgScopeMap.insert(std::make_pair(Scope, WScope)); 1565 if (DIDescriptor(Scope).isLexicalBlock()) { 1566 DbgScope *Parent = 1567 getOrCreateDbgScope(DILexicalBlock(Scope).getContext(), NULL); 1568 WScope->setParent(Parent); 1569 Parent->addScope(WScope); 1570 } 1571 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 1578 // check both. 1579 if (SPName == Asm->MF->getFunction()->getName() || 1580 DISubprogram(Scope).getFunction() == Asm->MF->getFunction()) 1581 CurrentFnDbgScope = WScope; 1582 } 1583 1584 return WScope; 1585 } 1586 1587 getOrCreateAbstractScope(Scope); 1588 DbgScope *WScope = DbgScopeMap.lookup(InlinedAt); 1589 if (WScope) 1590 return WScope; 1591 1592 WScope = new DbgScope(NULL, DIDescriptor(Scope), InlinedAt); 1593 DbgScopeMap.insert(std::make_pair(InlinedAt, WScope)); 1594 DILocation DL(InlinedAt); 1595 DbgScope *Parent = 1596 getOrCreateDbgScope(DL.getScope(), DL.getOrigLocation()); 1597 WScope->setParent(Parent); 1598 Parent->addScope(WScope); 1599 1600 ConcreteScopes[InlinedAt] = WScope; 1601 1602 return WScope; 1603} 1604 1605/// hasValidLocation - Return true if debug location entry attached with 1606/// machine instruction encodes valid location info. 1607static 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; 1612 1613 const MDNode *S = DL.getScope(Ctx); 1614 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; 1619 1620 Scope = S; 1621 InlinedAt = DL.getInlinedAt(Ctx); 1622 return true; 1623} 1624 1625/// calculateDominanceGraph - Calculate dominance graph for DbgScope 1626/// hierarchy. 1627static 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); 1643 break; 1644 } 1645 } 1646 if (!visitedChildren) { 1647 WorkStack.pop_back(); 1648 WS->setDFSOut(++Counter); 1649 } 1650 } 1651} 1652 1653/// printDbgScopeInfo - Print DbgScope info for each machine instruction. 1654static 1655void printDbgScopeInfo(LLVMContext &Ctx, const MachineFunction *MF, 1656 DenseMap<const MachineInstr *, DbgScope *> &MI2ScopeMap) 1657{ 1658#ifndef NDEBUG 1659 unsigned PrevDFSIn = 0; 1660 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); 1661 I != E; ++I) { 1662 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end(); 1663 II != IE; ++II) { 1664 const MachineInstr *MInsn = II; 1665 const MDNode *Scope = NULL; 1666 const MDNode *InlinedAt = NULL; 1667 1668 // Check if instruction has valid location information. 1669 if (hasValidLocation(Ctx, MInsn, Scope, InlinedAt)) { 1670 dbgs() << " [ "; 1671 if (InlinedAt) 1672 dbgs() << "*"; 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(); 1679 } else 1680 dbgs() << PrevDFSIn; 1681 } else 1682 dbgs() << " [ x" << PrevDFSIn; 1683 dbgs() << " ]"; 1684 MInsn->dump(); 1685 } 1686 dbgs() << "\n"; 1687 } 1688#endif 1689} 1690/// extractScopeInformation - Scan machine instructions in this function 1691/// and collect DbgScopes. Return true, if at least one scope was found. 1692bool 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()) 1696 return false; 1697 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(); 1707 I != E; ++I) { 1708 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end(); 1709 II != IE; ++II) { 1710 const MachineInstr *MInsn = II; 1711 const MDNode *Scope = NULL; 1712 const MDNode *InlinedAt = NULL; 1713 1714 // Check if instruction has valid location information. 1715 if (!hasValidLocation(Ctx, MInsn, Scope, InlinedAt)) { 1716 PrevMI = MInsn; 1717 continue; 1718 } 1719 1720 // If scope has not changed then skip this instruction. 1721 if (Scope == PrevScope && PrevInlinedAt == InlinedAt) { 1722 PrevMI = MInsn; 1723 continue; 1724 } 1725 1726 // Ignore DBG_VALUE. It does not contribute any instruction in output. 1727 if (MInsn->isDebugValue()) 1728 continue; 1729 1730 if (RangeBeginMI) { 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, 1736 PrevInlinedAt); 1737 MIRanges.push_back(R); 1738 } 1739 1740 // This is a beginning of a new instruction range. 1741 RangeBeginMI = MInsn; 1742 1743 // Reset previous markers. 1744 PrevMI = MInsn; 1745 PrevScope = Scope; 1746 PrevInlinedAt = InlinedAt; 1747 } 1748 } 1749 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); 1755 } 1756 1757 if (!CurrentFnDbgScope) 1758 return false; 1759 1760 calculateDominanceGraph(CurrentFnDbgScope); 1761 if (PrintDbgScope) 1762 printDbgScopeInfo(Ctx, Asm->MF, MI2ScopeMap); 1763 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); 1775 PrevDbgScope = S; 1776 } 1777 1778 if (PrevDbgScope) 1779 PrevDbgScope->closeInsnRange(); 1780 1781 identifyScopeMarkers(); 1782 1783 return !DbgScopeMap.empty(); 1784} 1785 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. 1791void DwarfDebug::identifyScopeMarkers() { 1792 SmallVector<DbgScope *, 4> WorkList; 1793 WorkList.push_back(CurrentFnDbgScope); 1794 while (!WorkList.empty()) { 1795 DbgScope *S = WorkList.pop_back_val(); 1796 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); 1802 1803 if (S->isAbstractScope()) 1804 continue; 1805 1806 const SmallVector<DbgRange, 4> &Ranges = S->getRanges(); 1807 if (Ranges.empty()) 1808 continue; 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); 1815 } 1816 } 1817} 1818 1819/// getScopeNode - Get MDNode for DebugLoc's scope. 1820static 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); 1824} 1825 1826/// getFnDebugLoc - Walk up the scope chain of given debug loc and find 1827/// line number info for the function. 1828static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) { 1829 const MDNode *Scope = getScopeNode(DL, Ctx); 1830 DISubprogram SP = getDISubprogram(Scope); 1831 if (SP.Verify()) 1832 return DebugLoc::get(SP.getLineNumber(), 0, SP); 1833 return DebugLoc(); 1834} 1835 1836/// beginFunction - Gather pre-function debug information. Assumes being 1837/// emitted immediately after the function entry point. 1838void DwarfDebug::beginFunction(const MachineFunction *MF) { 1839 if (!MMI->hasDebugInfo()) return; 1840 if (!extractScopeInformation()) return; 1841 1842 FunctionBeginSym = Asm->GetTempSymbol("func_begin", 1843 Asm->getFunctionNumber()); 1844 // Assumes in correct section after the entry point. 1845 Asm->OutStreamer.EmitLabel(FunctionBeginSym); 1846 1847 assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned"); 1848 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()); 1854 1855 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); 1856 I != E; ++I) { 1857 bool AtBlockEntry = true; 1858 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end(); 1859 II != IE; ++II) { 1860 const MachineInstr *MI = II; 1861 1862 if (MI->isDebugValue()) { 1863 assert (MI->getNumOperands() > 1 && "Invalid machine instruction!"); 1864 1865 // Keep track of user variables. 1866 const MDNode *Var = 1867 MI->getOperand(MI->getNumOperands() - 1).getMetadata(); 1868 1869 // Variable is in a register, we need to check for clobbers. 1870 if (isDbgValueInDefinedReg(MI)) 1871 LiveUserVar[MI->getOperand(0).getReg()] = Var; 1872 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. 1879 DIVariable DV(Var); 1880 if (DV.Verify() && DV.getTag() == dwarf::DW_TAG_arg_variable && 1881 DISubprogram(getDISubprogram(DV.getContext())) 1882 .describes(MF->getFunction())) 1883 LabelsBeforeInsn[MI] = FunctionBeginSym; 1884 } else { 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])) 1891 History.pop_back(); 1892 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 1898 // its basic block. 1899 MachineBasicBlock::const_iterator LastMI = 1900 PrevMBB->getLastNonDebugInstr(); 1901 if (LastMI == PrevMBB->end()) 1902 // Drop DBG_VALUE for empty range. 1903 History.pop_back(); 1904 else { 1905 // Terminate after LastMI. 1906 History.push_back(LastMI); 1907 } 1908 } 1909 } 1910 } 1911 History.push_back(MI); 1912 } else { 1913 // Not a DBG_VALUE instruction. 1914 if (!MI->isLabel()) 1915 AtBlockEntry = false; 1916 1917 // First known non DBG_VALUE location marks beginning of function 1918 // body. 1919 if (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown()) 1920 PrologEndLoc = MI->getDebugLoc(); 1921 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()) 1926 continue; 1927 for (const unsigned *AI = TRI->getOverlaps(MOI->getReg()); 1928 unsigned Reg = *AI; ++AI) { 1929 const MDNode *Var = LiveUserVar[Reg]; 1930 if (!Var) 1931 continue; 1932 // Reg is now clobbered. 1933 LiveUserVar[Reg] = 0; 1934 1935 // Was MD last defined by a DBG_VALUE referring to Reg? 1936 DbgValueHistoryMap::iterator HistI = DbgValues.find(Var); 1937 if (HistI == DbgValues.end()) 1938 continue; 1939 SmallVectorImpl<const MachineInstr*> &History = HistI->second; 1940 if (History.empty()) 1941 continue; 1942 const MachineInstr *Prev = History.back(); 1943 // Sanity-check: Register assignments are terminated at the end of 1944 // their block. 1945 if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent()) 1946 continue; 1947 // Is the variable still in Reg? 1948 if (!isDbgValueInDefinedReg(Prev) || 1949 Prev->getOperand(0).getReg() != Reg) 1950 continue; 1951 // Var is clobbered. Make sure the next instruction gets a label. 1952 History.push_back(MI); 1953 } 1954 } 1955 } 1956 } 1957 } 1958 1959 for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end(); 1960 I != E; ++I) { 1961 SmallVectorImpl<const MachineInstr*> &History = I->second; 1962 if (History.empty()) 1963 continue; 1964 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. 1972 History.pop_back(); 1973 else { 1974 // Terminate after LastMI. 1975 History.push_back(LastMI); 1976 } 1977 } 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); 1983 else 1984 requestLabelAfterInsn(MI); 1985 } 1986 } 1987 1988 PrevInstLoc = DebugLoc(); 1989 PrevLabel = FunctionBeginSym; 1990 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); 1998 } 1999} 2000 2001/// endFunction - Gather and emit post-function debug information. 2002/// 2003void DwarfDebug::endFunction(const MachineFunction *MF) { 2004 if (!MMI->hasDebugInfo() || DbgScopeMap.empty()) return; 2005 2006 if (CurrentFnDbgScope) { 2007 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); 2013 2014 SmallPtrSet<const MDNode *, 16> ProcessedVars; 2015 collectVariableInfo(MF, ProcessedVars); 2016 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()); 2021 if (SP.Verify()) { 2022 // Collect info for variables that were optimized out. 2023 StringRef FName = SP.getLinkageName(); 2024 if (FName.empty()) 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)) 2031 continue; 2032 DbgScope *Scope = AbstractScopes.lookup(DV.getContext()); 2033 if (Scope) 2034 Scope->addVariable(new DbgVariable(DV)); 2035 } 2036 } 2037 } 2038 if (ProcessedSPNodes.count((*AI)->getScopeNode()) == 0) 2039 constructScopeDIE(*AI); 2040 } 2041 2042 DIE *CurFnDIE = constructScopeDIE(CurrentFnDbgScope); 2043 2044 if (!DisableFramePointerElim(*MF)) 2045 getCompileUnit(CurrentFnDbgScope->getScopeNode())->addUInt(CurFnDIE, 2046 dwarf::DW_AT_APPLE_omit_frame_ptr, 2047 dwarf::DW_FORM_flag, 1); 2048 2049 2050 DebugFrames.push_back(FunctionDebugFrameInfo(Asm->getFunctionNumber(), 2051 MMI->getFrameMoves())); 2052 } 2053 2054 // Clear debug info 2055 CurrentFnDbgScope = NULL; 2056 DeleteContainerPointers(CurrentFnArguments); 2057 DbgVariableToFrameIndexMap.clear(); 2058 VarToAbstractVarMap.clear(); 2059 DbgVariableToDbgInstMap.clear(); 2060 DeleteContainerSeconds(DbgScopeMap); 2061 UserVariables.clear(); 2062 DbgValues.clear(); 2063 ConcreteScopes.clear(); 2064 DeleteContainerSeconds(AbstractScopes); 2065 AbstractScopesList.clear(); 2066 AbstractVariables.clear(); 2067 LabelsBeforeInsn.clear(); 2068 LabelsAfterInsn.clear(); 2069 PrevLabel = NULL; 2070} 2071 2072/// recordVariableFrameIndex - Record a variable's index. 2073void DwarfDebug::recordVariableFrameIndex(const DbgVariable *V, int Index) { 2074 assert (V && "Invalid DbgVariable!"); 2075 DbgVariableToFrameIndexMap[V] = Index; 2076} 2077 2078/// findVariableFrameIndex - Return true if frame index for the variable 2079/// is found. Update FI to hold value of the index. 2080bool 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()) 2085 return false; 2086 *FI = I->second; 2087 return true; 2088} 2089 2090/// findDbgScope - Find DbgScope for the debug loc attached with an 2091/// instruction. 2092DbgScope *DwarfDebug::findDbgScope(const MachineInstr *MInsn) { 2093 DbgScope *Scope = NULL; 2094 LLVMContext &Ctx = 2095 MInsn->getParent()->getParent()->getFunction()->getContext(); 2096 DebugLoc DL = MInsn->getDebugLoc(); 2097 2098 if (DL.isUnknown()) 2099 return Scope; 2100 2101 if (const MDNode *IA = DL.getInlinedAt(Ctx)) 2102 Scope = ConcreteScopes.lookup(IA); 2103 if (Scope == 0) 2104 Scope = DbgScopeMap.lookup(DL.getScope(Ctx)); 2105 2106 return Scope; 2107} 2108 2109 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. 2113void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S, 2114 unsigned Flags) { 2115 StringRef Fn; 2116 StringRef Dir; 2117 unsigned Src = 1; 2118 if (S) { 2119 DIDescriptor Scope(S); 2120 2121 if (Scope.isCompileUnit()) { 2122 DICompileUnit CU(S); 2123 Fn = CU.getFilename(); 2124 Dir = CU.getDirectory(); 2125 } else if (Scope.isFile()) { 2126 DIFile F(S); 2127 Fn = F.getFilename(); 2128 Dir = F.getDirectory(); 2129 } else if (Scope.isSubprogram()) { 2130 DISubprogram SP(S); 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(); 2137 } else 2138 assert(0 && "Unexpected scope info"); 2139 2140 Src = GetOrCreateSourceID(Fn, Dir); 2141 } 2142 Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 2143 0, 0, Fn); 2144} 2145 2146//===----------------------------------------------------------------------===// 2147// Emit Methods 2148//===----------------------------------------------------------------------===// 2149 2150/// computeSizeAndOffset - Compute the size and offset of a DIE. 2151/// 2152unsigned 2153DwarfDebug::computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last) { 2154 // Get the children. 2155 const std::vector<DIE *> &Children = Die->getChildren(); 2156 2157 // If not last sibling and has children then add sibling offset attribute. 2158 if (!Last && !Children.empty()) 2159 Die->addSiblingOffset(DIEValueAllocator); 2160 2161 // Record the abbreviation. 2162 assignAbbrevNumber(Die->getAbbrev()); 2163 2164 // Get the abbreviation for this DIE. 2165 unsigned AbbrevNumber = Die->getAbbrevNumber(); 2166 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1]; 2167 2168 // Set DIE offset 2169 Die->setOffset(Offset); 2170 2171 // Start the size with the size of abbreviation code. 2172 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber); 2173 2174 const SmallVector<DIEValue*, 32> &Values = Die->getValues(); 2175 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData(); 2176 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()); 2181 2182 // Size the DIE children if any. 2183 if (!Children.empty()) { 2184 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes && 2185 "Children flag not set"); 2186 2187 for (unsigned j = 0, M = Children.size(); j < M; ++j) 2188 Offset = computeSizeAndOffset(Children[j], Offset, (j + 1) == M); 2189 2190 // End of children marker. 2191 Offset += sizeof(int8_t); 2192 } 2193 2194 Die->setSize(Offset - Die->getOffset()); 2195 return Offset; 2196} 2197 2198/// computeSizeAndOffsets - Compute the size and offset of all the DIEs. 2199/// 2200void 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. 2204 unsigned Offset = 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); 2210 } 2211} 2212 2213/// EmitSectionSym - Switch to the specified MCSection and emit an assembler 2214/// temporary label to it if SymbolStem is specified. 2215static MCSymbol *EmitSectionSym(AsmPrinter *Asm, const MCSection *Section, 2216 const char *SymbolStem = 0) { 2217 Asm->OutStreamer.SwitchSection(Section); 2218 if (!SymbolStem) return 0; 2219 2220 MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem); 2221 Asm->OutStreamer.EmitLabel(TmpSym); 2222 return TmpSym; 2223} 2224 2225/// EmitSectionLabels - Emit initial Dwarf sections with a label at 2226/// the start of each one. 2227void DwarfDebug::EmitSectionLabels() { 2228 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering(); 2229 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()); 2236 2237 if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection()) 2238 EmitSectionSym(Asm, MacroInfo); 2239 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(), 2247 "debug_range"); 2248 2249 DwarfDebugLocSectionSym = EmitSectionSym(Asm, TLOF.getDwarfLocSection(), 2250 "section_debug_loc"); 2251 2252 TextSectionSym = EmitSectionSym(Asm, TLOF.getTextSection(), "text_begin"); 2253 EmitSectionSym(Asm, TLOF.getDataSection()); 2254} 2255 2256/// emitDIE - Recusively Emits a debug information entry. 2257/// 2258void DwarfDebug::emitDIE(DIE *Die) { 2259 // Get the abbreviation for this DIE. 2260 unsigned AbbrevNumber = Die->getAbbrevNumber(); 2261 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1]; 2262 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); 2270 2271 const SmallVector<DIEValue*, 32> &Values = Die->getValues(); 2272 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData(); 2273 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)"); 2279 2280 if (Asm->isVerbose()) 2281 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr)); 2282 2283 switch (Attr) { 2284 case dwarf::DW_AT_sibling: 2285 Asm->EmitInt32(Die->getSiblingOffset()); 2286 break; 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); 2292 break; 2293 } 2294 case dwarf::DW_AT_ranges: { 2295 // DW_AT_range Value encodes offset in debug_range section. 2296 DIEInteger *V = cast<DIEInteger>(Values[i]); 2297 2298 if (Asm->MAI->doesDwarfUsesLabelOffsetForRanges()) { 2299 Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym, 2300 V->getValue(), 2301 4); 2302 } else { 2303 Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym, 2304 V->getValue(), 2305 DwarfDebugRangeSectionSym, 2306 4); 2307 } 2308 break; 2309 } 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); 2314 } else 2315 Values[i]->EmitValue(Asm, Form); 2316 break; 2317 } 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())); 2322 } 2323 Values[i]->EmitValue(Asm, Form); 2324 break; 2325 } 2326 default: 2327 // Emit an attribute using the defined form. 2328 Values[i]->EmitValue(Asm, Form); 2329 break; 2330 } 2331 } 2332 2333 // Emit the DIE children if any. 2334 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) { 2335 const std::vector<DIE *> &Children = Die->getChildren(); 2336 2337 for (unsigned j = 0, M = Children.size(); j < M; ++j) 2338 emitDIE(Children[j]); 2339 2340 if (Asm->isVerbose()) 2341 Asm->OutStreamer.AddComment("End Of Children Mark"); 2342 Asm->EmitInt8(0); 2343 } 2344} 2345 2346/// emitDebugInfo - Emit the debug info section. 2347/// 2348void 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(); 2356 2357 // Emit the compile units header. 2358 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_begin", 2359 TheCU->getID())); 2360 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) 2366 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()); 2376 2377 emitDIE(Die); 2378 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_end", TheCU->getID())); 2379 } 2380} 2381 2382/// emitAbbreviations - Emit the abbreviation section. 2383/// 2384void 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()); 2390 2391 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_begin")); 2392 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]; 2397 2398 // Emit the abbrevations code (base 1 index.) 2399 Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code"); 2400 2401 // Emit the abbreviations data. 2402 Abbrev->Emit(Asm); 2403 } 2404 2405 // Mark end of abbreviations. 2406 Asm->EmitULEB128(0, "EOM(3)"); 2407 2408 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_end")); 2409 } 2410} 2411 2412/// emitEndOfLineMatrix - Emit the last address of the section and the end of 2413/// the line matrix. 2414/// 2415void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) { 2416 // Define last address of section. 2417 Asm->OutStreamer.AddComment("Extended Op"); 2418 Asm->EmitInt8(0); 2419 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); 2424 2425 Asm->OutStreamer.AddComment("Section end label"); 2426 2427 Asm->OutStreamer.EmitSymbolValue(Asm->GetTempSymbol("section_end",SectionEnd), 2428 Asm->getTargetData().getPointerSize(), 2429 0/*AddrSpace*/); 2430 2431 // Mark end of matrix. 2432 Asm->OutStreamer.AddComment("DW_LNE_end_sequence"); 2433 Asm->EmitInt8(0); 2434 Asm->EmitInt8(1); 2435 Asm->EmitInt8(1); 2436} 2437 2438/// emitDebugPubNames - Emit visible names into a debug pubnames section. 2439/// 2440void 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()); 2447 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); 2452 2453 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin", 2454 TheCU->getID())); 2455 2456 Asm->OutStreamer.AddComment("DWARF Version"); 2457 Asm->EmitInt16(dwarf::DWARF_VERSION); 2458 2459 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info"); 2460 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()), 2461 DwarfInfoSectionSym); 2462 2463 Asm->OutStreamer.AddComment("Compilation Unit Length"); 2464 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()), 2465 Asm->GetTempSymbol("info_begin", TheCU->getID()), 2466 4); 2467 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; 2473 2474 Asm->OutStreamer.AddComment("DIE offset"); 2475 Asm->EmitInt32(Entity->getOffset()); 2476 2477 if (Asm->isVerbose()) 2478 Asm->OutStreamer.AddComment("External Name"); 2479 Asm->OutStreamer.EmitBytes(StringRef(Name, strlen(Name)+1), 0); 2480 } 2481 2482 Asm->OutStreamer.AddComment("End Mark"); 2483 Asm->EmitInt32(0); 2484 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_end", 2485 TheCU->getID())); 2486 } 2487} 2488 2489void 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); 2500 2501 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_begin", 2502 TheCU->getID())); 2503 2504 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DWARF Version"); 2505 Asm->EmitInt16(dwarf::DWARF_VERSION); 2506 2507 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info"); 2508 Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()), 2509 DwarfInfoSectionSym); 2510 2511 Asm->OutStreamer.AddComment("Compilation Unit Length"); 2512 Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()), 2513 Asm->GetTempSymbol("info_begin", TheCU->getID()), 2514 4); 2515 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; 2521 2522 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset"); 2523 Asm->EmitInt32(Entity->getOffset()); 2524 2525 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("External Name"); 2526 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1), 0); 2527 } 2528 2529 Asm->OutStreamer.AddComment("End Mark"); 2530 Asm->EmitInt32(0); 2531 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_end", 2532 TheCU->getID())); 2533 } 2534} 2535 2536/// emitDebugStr - Emit visible names into a debug str section. 2537/// 2538void DwarfDebug::emitDebugStr() { 2539 // Check to see if it is worth the effort. 2540 if (StringPool.empty()) return; 2541 2542 // Start the dwarf str section. 2543 Asm->OutStreamer.SwitchSection( 2544 Asm->getObjFileLowering().getDwarfStrSection()); 2545 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; 2550 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)); 2554 2555 array_pod_sort(Entries.begin(), Entries.end()); 2556 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); 2560 2561 // Emit the string itself. 2562 Asm->OutStreamer.EmitBytes(Entries[i].second->getKey(), 0/*addrspace*/); 2563 } 2564} 2565 2566/// emitDebugLoc - Emit visible names into a debug loc section. 2567/// 2568void DwarfDebug::emitDebugLoc() { 2569 if (DotDebugLocEntries.empty()) 2570 return; 2571 2572 for (SmallVector<DotDebugLocEntry, 4>::iterator 2573 I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end(); 2574 I != E; ++I) { 2575 DotDebugLocEntry &Entry = *I; 2576 if (I + 1 != DotDebugLocEntries.end()) 2577 Entry.Merge(I+1); 2578 } 2579 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)); 2585 unsigned index = 1; 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)); 2595 } else { 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()); 2606 if (BTy.Verify() && 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()); 2612 } else { 2613 Asm->OutStreamer.AddComment("DW_OP_constu"); 2614 Asm->EmitInt8(dwarf::DW_OP_constu); 2615 Asm->EmitULEB128(Entry.getConstant()); 2616 } 2617 } else if (DV.hasComplexAddress()) { 2618 unsigned N = DV.getNumAddrElements(); 2619 unsigned i = 0; 2620 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) { 2621 if (Entry.Loc.getOffset()) { 2622 i = 2; 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)); 2629 } else { 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); 2634 i = 2; 2635 } 2636 } else { 2637 Asm->EmitDwarfRegOp(Entry.Loc); 2638 } 2639 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"); 2649 } 2650 } else { 2651 // Regular entry. 2652 Asm->EmitDwarfRegOp(Entry.Loc); 2653 } 2654 Asm->OutStreamer.EmitLabel(end); 2655 } 2656 } 2657} 2658 2659/// EmitDebugARanges - Emit visible names into a debug aranges section. 2660/// 2661void DwarfDebug::EmitDebugARanges() { 2662 // Start the dwarf aranges section. 2663 Asm->OutStreamer.SwitchSection( 2664 Asm->getObjFileLowering().getDwarfARangesSection()); 2665} 2666 2667/// emitDebugRanges - Emit visible names into a debug ranges section. 2668/// 2669void 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(); 2676 I != E; ++I) { 2677 if (*I) 2678 Asm->OutStreamer.EmitSymbolValue(const_cast<MCSymbol*>(*I), Size, 0); 2679 else 2680 Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0); 2681 } 2682} 2683 2684/// emitDebugMacInfo - Emit visible names into a debug macinfo section. 2685/// 2686void DwarfDebug::emitDebugMacInfo() { 2687 if (const MCSection *LineInfo = 2688 Asm->getObjFileLowering().getDwarfMacroInfoSection()) { 2689 // Start the dwarf macinfo section. 2690 Asm->OutStreamer.SwitchSection(LineInfo); 2691 } 2692} 2693 2694/// emitDebugInlineInfo - Emit inline info using following format. 2695/// Section Header: 2696/// 1. length of section 2697/// 2. Dwarf version number 2698/// 3. address size. 2699/// 2700/// Entries (one "entry" for each function that was inlined): 2701/// 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. 2707/// 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. 2712void DwarfDebug::emitDebugInlineInfo() { 2713 if (!Asm->MAI->doesDwarfUsesInlineInfoSection()) 2714 return; 2715 2716 if (!FirstCU) 2717 return; 2718 2719 Asm->OutStreamer.SwitchSection( 2720 Asm->getObjFileLowering().getDwarfDebugInlineSection()); 2721 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); 2725 2726 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_begin", 1)); 2727 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()); 2732 2733 for (SmallVector<const MDNode *, 4>::iterator I = InlinedSPNodes.begin(), 2734 E = InlinedSPNodes.end(); I != E; ++I) { 2735 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(); 2743 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. 2748 } else 2749 Asm->EmitSectionOffset(getStringPoolEntry(getRealLinkageName(LName)), 2750 DwarfStrSectionSym); 2751 2752 Asm->OutStreamer.AddComment("Function name"); 2753 Asm->EmitSectionOffset(getStringPoolEntry(Name), DwarfStrSectionSym); 2754 Asm->EmitULEB128(Labels.size(), "Inline count"); 2755 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()); 2760 2761 if (Asm->isVerbose()) Asm->OutStreamer.AddComment("low_pc"); 2762 Asm->OutStreamer.EmitSymbolValue(LI->first, 2763 Asm->getTargetData().getPointerSize(),0); 2764 } 2765 } 2766 2767 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_end", 1)); 2768} 2769