DwarfDebug.cpp revision 24c20e2435be1ee2af5de486f7567f92cebaf8cd
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 "llvm/Module.h" 17#include "llvm/CodeGen/MachineFunction.h" 18#include "llvm/CodeGen/MachineModuleInfo.h" 19#include "llvm/MC/MCAsmInfo.h" 20#include "llvm/MC/MCSection.h" 21#include "llvm/MC/MCStreamer.h" 22#include "llvm/MC/MCSymbol.h" 23#include "llvm/Target/Mangler.h" 24#include "llvm/Target/TargetData.h" 25#include "llvm/Target/TargetFrameInfo.h" 26#include "llvm/Target/TargetLoweringObjectFile.h" 27#include "llvm/Target/TargetRegisterInfo.h" 28#include "llvm/ADT/STLExtras.h" 29#include "llvm/ADT/StringExtras.h" 30#include "llvm/Support/Debug.h" 31#include "llvm/Support/ErrorHandling.h" 32#include "llvm/Support/ValueHandle.h" 33#include "llvm/Support/FormattedStream.h" 34#include "llvm/Support/Timer.h" 35#include "llvm/System/Path.h" 36using namespace llvm; 37 38//===----------------------------------------------------------------------===// 39 40/// Configuration values for initial hash set sizes (log2). 41/// 42static const unsigned InitAbbreviationsSetSize = 9; // log2(512) 43 44namespace llvm { 45 46//===----------------------------------------------------------------------===// 47/// CompileUnit - This dwarf writer support class manages information associate 48/// with a source file. 49class CompileUnit { 50 /// ID - File identifier for source. 51 /// 52 unsigned ID; 53 54 /// Die - Compile unit debug information entry. 55 /// 56 const OwningPtr<DIE> CUDie; 57 58 /// IndexTyDie - An anonymous type for index type. Owned by CUDie. 59 DIE *IndexTyDie; 60 61 /// GVToDieMap - Tracks the mapping of unit level debug informaton 62 /// variables to debug information entries. 63 /// FIXME : Rename GVToDieMap -> NodeToDieMap 64 DenseMap<MDNode *, DIE *> GVToDieMap; 65 66 /// GVToDIEEntryMap - Tracks the mapping of unit level debug informaton 67 /// descriptors to debug information entries using a DIEEntry proxy. 68 /// FIXME : Rename 69 DenseMap<MDNode *, DIEEntry *> GVToDIEEntryMap; 70 71 /// Globals - A map of globally visible named entities for this unit. 72 /// 73 StringMap<DIE*> Globals; 74 75 /// GlobalTypes - A map of globally visible types for this unit. 76 /// 77 StringMap<DIE*> GlobalTypes; 78 79public: 80 CompileUnit(unsigned I, DIE *D) 81 : ID(I), CUDie(D), IndexTyDie(0) {} 82 83 // Accessors. 84 unsigned getID() const { return ID; } 85 DIE* getCUDie() const { return CUDie.get(); } 86 const StringMap<DIE*> &getGlobals() const { return Globals; } 87 const StringMap<DIE*> &getGlobalTypes() const { return GlobalTypes; } 88 89 /// hasContent - Return true if this compile unit has something to write out. 90 /// 91 bool hasContent() const { return !CUDie->getChildren().empty(); } 92 93 /// addGlobal - Add a new global entity to the compile unit. 94 /// 95 void addGlobal(StringRef Name, DIE *Die) { Globals[Name] = Die; } 96 97 /// addGlobalType - Add a new global type to the compile unit. 98 /// 99 void addGlobalType(StringRef Name, DIE *Die) { 100 GlobalTypes[Name] = Die; 101 } 102 103 /// getDIE - Returns the debug information entry map slot for the 104 /// specified debug variable. 105 DIE *getDIE(MDNode *N) { return GVToDieMap.lookup(N); } 106 107 /// insertDIE - Insert DIE into the map. 108 void insertDIE(MDNode *N, DIE *D) { 109 GVToDieMap.insert(std::make_pair(N, D)); 110 } 111 112 /// getDIEEntry - Returns the debug information entry for the speciefied 113 /// debug variable. 114 DIEEntry *getDIEEntry(MDNode *N) { 115 DenseMap<MDNode *, DIEEntry *>::iterator I = GVToDIEEntryMap.find(N); 116 if (I == GVToDIEEntryMap.end()) 117 return NULL; 118 return I->second; 119 } 120 121 /// insertDIEEntry - Insert debug information entry into the map. 122 void insertDIEEntry(MDNode *N, DIEEntry *E) { 123 GVToDIEEntryMap.insert(std::make_pair(N, E)); 124 } 125 126 /// addDie - Adds or interns the DIE to the compile unit. 127 /// 128 void addDie(DIE *Buffer) { 129 this->CUDie->addChild(Buffer); 130 } 131 132 // getIndexTyDie - Get an anonymous type for index type. 133 DIE *getIndexTyDie() { 134 return IndexTyDie; 135 } 136 137 // setIndexTyDie - Set D as anonymous type for index which can be reused 138 // later. 139 void setIndexTyDie(DIE *D) { 140 IndexTyDie = D; 141 } 142 143}; 144 145//===----------------------------------------------------------------------===// 146/// DbgVariable - This class is used to track local variable information. 147/// 148class DbgVariable { 149 DIVariable Var; // Variable Descriptor. 150 unsigned FrameIndex; // Variable frame index. 151 const MachineInstr *DbgValueMInsn; // DBG_VALUE 152 // DbgValueLabel - DBG_VALUE is effective from this label. 153 MCSymbol *DbgValueLabel; 154 DbgVariable *const AbstractVar; // Abstract variable for this variable. 155 DIE *TheDIE; 156public: 157 // AbsVar may be NULL. 158 DbgVariable(DIVariable V, unsigned I, DbgVariable *AbsVar) 159 : Var(V), FrameIndex(I), DbgValueMInsn(0), 160 DbgValueLabel(0), AbstractVar(AbsVar), TheDIE(0) {} 161 DbgVariable(DIVariable V, const MachineInstr *MI, DbgVariable *AbsVar) 162 : Var(V), FrameIndex(0), DbgValueMInsn(MI), DbgValueLabel(0), 163 AbstractVar(AbsVar), TheDIE(0) 164 {} 165 166 // Accessors. 167 DIVariable getVariable() const { return Var; } 168 unsigned getFrameIndex() const { return FrameIndex; } 169 const MachineInstr *getDbgValue() const { return DbgValueMInsn; } 170 MCSymbol *getDbgValueLabel() const { return DbgValueLabel; } 171 void setDbgValueLabel(MCSymbol *L) { DbgValueLabel = L; } 172 DbgVariable *getAbstractVariable() const { return AbstractVar; } 173 void setDIE(DIE *D) { TheDIE = D; } 174 DIE *getDIE() const { return TheDIE; } 175}; 176 177//===----------------------------------------------------------------------===// 178/// DbgScope - This class is used to track scope information. 179/// 180class DbgScope { 181 DbgScope *Parent; // Parent to this scope. 182 DIDescriptor Desc; // Debug info descriptor for scope. 183 // Location at which this scope is inlined. 184 AssertingVH<MDNode> InlinedAtLocation; 185 bool AbstractScope; // Abstract Scope 186 MCSymbol *StartLabel; // Label ID of the beginning of scope. 187 MCSymbol *EndLabel; // Label ID of the end of scope. 188 const MachineInstr *LastInsn; // Last instruction of this scope. 189 const MachineInstr *FirstInsn; // First instruction of this scope. 190 // Scopes defined in scope. Contents not owned. 191 SmallVector<DbgScope *, 4> Scopes; 192 // Variables declared in scope. Contents owned. 193 SmallVector<DbgVariable *, 8> Variables; 194 195 // Private state for dump() 196 mutable unsigned IndentLevel; 197public: 198 DbgScope(DbgScope *P, DIDescriptor D, MDNode *I = 0) 199 : Parent(P), Desc(D), InlinedAtLocation(I), AbstractScope(false), 200 StartLabel(0), EndLabel(0), 201 LastInsn(0), FirstInsn(0), IndentLevel(0) {} 202 virtual ~DbgScope(); 203 204 // Accessors. 205 DbgScope *getParent() const { return Parent; } 206 void setParent(DbgScope *P) { Parent = P; } 207 DIDescriptor getDesc() const { return Desc; } 208 MDNode *getInlinedAt() const { return InlinedAtLocation; } 209 MDNode *getScopeNode() const { return Desc.getNode(); } 210 MCSymbol *getStartLabel() const { return StartLabel; } 211 MCSymbol *getEndLabel() const { return EndLabel; } 212 const SmallVector<DbgScope *, 4> &getScopes() { return Scopes; } 213 const SmallVector<DbgVariable *, 8> &getVariables() { return Variables; } 214 void setStartLabel(MCSymbol *S) { StartLabel = S; } 215 void setEndLabel(MCSymbol *E) { EndLabel = E; } 216 void setLastInsn(const MachineInstr *MI) { LastInsn = MI; } 217 const MachineInstr *getLastInsn() { return LastInsn; } 218 void setFirstInsn(const MachineInstr *MI) { FirstInsn = MI; } 219 void setAbstractScope() { AbstractScope = true; } 220 bool isAbstractScope() const { return AbstractScope; } 221 const MachineInstr *getFirstInsn() { return FirstInsn; } 222 223 /// addScope - Add a scope to the scope. 224 /// 225 void addScope(DbgScope *S) { Scopes.push_back(S); } 226 227 /// addVariable - Add a variable to the scope. 228 /// 229 void addVariable(DbgVariable *V) { Variables.push_back(V); } 230 231 void fixInstructionMarkers(DenseMap<const MachineInstr *, 232 unsigned> &MIIndexMap) { 233 assert(getFirstInsn() && "First instruction is missing!"); 234 235 // Use the end of last child scope as end of this scope. 236 const SmallVector<DbgScope *, 4> &Scopes = getScopes(); 237 const MachineInstr *LastInsn = getFirstInsn(); 238 unsigned LIndex = 0; 239 if (Scopes.empty()) { 240 assert(getLastInsn() && "Inner most scope does not have last insn!"); 241 return; 242 } 243 for (SmallVector<DbgScope *, 4>::const_iterator SI = Scopes.begin(), 244 SE = Scopes.end(); SI != SE; ++SI) { 245 DbgScope *DS = *SI; 246 DS->fixInstructionMarkers(MIIndexMap); 247 const MachineInstr *DSLastInsn = DS->getLastInsn(); 248 unsigned DSI = MIIndexMap[DSLastInsn]; 249 if (DSI > LIndex) { 250 LastInsn = DSLastInsn; 251 LIndex = DSI; 252 } 253 } 254 255 unsigned CurrentLastInsnIndex = 0; 256 if (const MachineInstr *CL = getLastInsn()) 257 CurrentLastInsnIndex = MIIndexMap[CL]; 258 unsigned FIndex = MIIndexMap[getFirstInsn()]; 259 260 // Set LastInsn as the last instruction for this scope only if 261 // it follows 262 // 1) this scope's first instruction and 263 // 2) current last instruction for this scope, if any. 264 if (LIndex >= CurrentLastInsnIndex && LIndex >= FIndex) 265 setLastInsn(LastInsn); 266 } 267 268#ifndef NDEBUG 269 void dump() const; 270#endif 271}; 272 273#ifndef NDEBUG 274void DbgScope::dump() const { 275 raw_ostream &err = dbgs(); 276 err.indent(IndentLevel); 277 MDNode *N = Desc.getNode(); 278 N->dump(); 279 err << " [" << StartLabel << ", " << EndLabel << "]\n"; 280 if (AbstractScope) 281 err << "Abstract Scope\n"; 282 283 IndentLevel += 2; 284 if (!Scopes.empty()) 285 err << "Children ...\n"; 286 for (unsigned i = 0, e = Scopes.size(); i != e; ++i) 287 if (Scopes[i] != this) 288 Scopes[i]->dump(); 289 290 IndentLevel -= 2; 291} 292#endif 293 294DbgScope::~DbgScope() { 295 for (unsigned j = 0, M = Variables.size(); j < M; ++j) 296 delete Variables[j]; 297} 298 299} // end llvm namespace 300 301DwarfDebug::DwarfDebug(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T) 302 : DwarfPrinter(OS, A, T), ModuleCU(0), 303 AbbreviationsSet(InitAbbreviationsSetSize), Abbreviations(), 304 DIEBlocks(), SectionSourceLines(), didInitial(false), shouldEmit(false), 305 CurrentFnDbgScope(0), PrevDILoc(0), DebugTimer(0) { 306 NextStringPoolNumber = 0; 307 if (TimePassesIsEnabled) 308 DebugTimer = new Timer("Dwarf Debug Writer"); 309} 310DwarfDebug::~DwarfDebug() { 311 for (unsigned j = 0, M = DIEBlocks.size(); j < M; ++j) 312 DIEBlocks[j]->~DIEBlock(); 313 314 delete DebugTimer; 315} 316 317MCSymbol *DwarfDebug::getStringPoolEntry(StringRef Str) { 318 std::pair<MCSymbol*, unsigned> &Entry = StringPool[Str]; 319 if (Entry.first) return Entry.first; 320 321 Entry.second = NextStringPoolNumber++; 322 return Entry.first = getDWLabel("string", Entry.second); 323} 324 325 326/// assignAbbrevNumber - Define a unique number for the abbreviation. 327/// 328void DwarfDebug::assignAbbrevNumber(DIEAbbrev &Abbrev) { 329 // Profile the node so that we can make it unique. 330 FoldingSetNodeID ID; 331 Abbrev.Profile(ID); 332 333 // Check the set for priors. 334 DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev); 335 336 // If it's newly added. 337 if (InSet == &Abbrev) { 338 // Add to abbreviation list. 339 Abbreviations.push_back(&Abbrev); 340 341 // Assign the vector position + 1 as its number. 342 Abbrev.setNumber(Abbreviations.size()); 343 } else { 344 // Assign existing abbreviation number. 345 Abbrev.setNumber(InSet->getNumber()); 346 } 347} 348 349/// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug 350/// information entry. 351DIEEntry *DwarfDebug::createDIEEntry(DIE *Entry) { 352 DIEEntry *Value = new (DIEValueAllocator) DIEEntry(Entry); 353 return Value; 354} 355 356/// addUInt - Add an unsigned integer attribute data and value. 357/// 358void DwarfDebug::addUInt(DIE *Die, unsigned Attribute, 359 unsigned Form, uint64_t Integer) { 360 if (!Form) Form = DIEInteger::BestForm(false, Integer); 361 DIEValue *Value = new (DIEValueAllocator) DIEInteger(Integer); 362 Die->addValue(Attribute, Form, Value); 363} 364 365/// addSInt - Add an signed integer attribute data and value. 366/// 367void DwarfDebug::addSInt(DIE *Die, unsigned Attribute, 368 unsigned Form, int64_t Integer) { 369 if (!Form) Form = DIEInteger::BestForm(true, Integer); 370 DIEValue *Value = new (DIEValueAllocator) DIEInteger(Integer); 371 Die->addValue(Attribute, Form, Value); 372} 373 374/// addString - Add a string attribute data and value. DIEString only 375/// keeps string reference. 376void DwarfDebug::addString(DIE *Die, unsigned Attribute, unsigned Form, 377 StringRef String) { 378 DIEValue *Value = new (DIEValueAllocator) DIEString(String); 379 Die->addValue(Attribute, Form, Value); 380} 381 382/// addLabel - Add a Dwarf label attribute data and value. 383/// 384void DwarfDebug::addLabel(DIE *Die, unsigned Attribute, unsigned Form, 385 const MCSymbol *Label) { 386 DIEValue *Value = new (DIEValueAllocator) DIELabel(Label); 387 Die->addValue(Attribute, Form, Value); 388} 389 390/// addDelta - Add a label delta attribute data and value. 391/// 392void DwarfDebug::addDelta(DIE *Die, unsigned Attribute, unsigned Form, 393 const MCSymbol *Hi, const MCSymbol *Lo) { 394 DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo); 395 Die->addValue(Attribute, Form, Value); 396} 397 398/// addBlock - Add block data. 399/// 400void DwarfDebug::addBlock(DIE *Die, unsigned Attribute, unsigned Form, 401 DIEBlock *Block) { 402 Block->ComputeSize(TD); 403 DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on. 404 Die->addValue(Attribute, Block->BestForm(), Block); 405} 406 407/// addSourceLine - Add location information to specified debug information 408/// entry. 409void DwarfDebug::addSourceLine(DIE *Die, const DIVariable *V) { 410 // If there is no compile unit specified, don't add a line #. 411 if (!V->getCompileUnit().Verify()) 412 return; 413 414 unsigned Line = V->getLineNumber(); 415 unsigned FileID = GetOrCreateSourceID(V->getContext().getDirectory(), 416 V->getContext().getFilename()); 417 assert(FileID && "Invalid file id"); 418 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID); 419 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line); 420} 421 422/// addSourceLine - Add location information to specified debug information 423/// entry. 424void DwarfDebug::addSourceLine(DIE *Die, const DIGlobal *G) { 425 // If there is no compile unit specified, don't add a line #. 426 if (!G->getCompileUnit().Verify()) 427 return; 428 429 unsigned Line = G->getLineNumber(); 430 unsigned FileID = GetOrCreateSourceID(G->getContext().getDirectory(), 431 G->getContext().getFilename()); 432 assert(FileID && "Invalid file id"); 433 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID); 434 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line); 435} 436 437/// addSourceLine - Add location information to specified debug information 438/// entry. 439void DwarfDebug::addSourceLine(DIE *Die, const DISubprogram *SP) { 440 // If there is no compile unit specified, don't add a line #. 441 if (!SP->getCompileUnit().Verify()) 442 return; 443 // If the line number is 0, don't add it. 444 if (SP->getLineNumber() == 0) 445 return; 446 447 unsigned Line = SP->getLineNumber(); 448 if (!SP->getContext().Verify()) 449 return; 450 unsigned FileID = GetOrCreateSourceID(SP->getDirectory(), 451 SP->getFilename()); 452 assert(FileID && "Invalid file id"); 453 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID); 454 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line); 455} 456 457/// addSourceLine - Add location information to specified debug information 458/// entry. 459void DwarfDebug::addSourceLine(DIE *Die, const DIType *Ty) { 460 // If there is no compile unit specified, don't add a line #. 461 DICompileUnit CU = Ty->getCompileUnit(); 462 if (!CU.Verify()) 463 return; 464 465 unsigned Line = Ty->getLineNumber(); 466 if (!Ty->getContext().Verify()) 467 return; 468 unsigned FileID = GetOrCreateSourceID(Ty->getContext().getDirectory(), 469 Ty->getContext().getFilename()); 470 assert(FileID && "Invalid file id"); 471 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID); 472 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line); 473} 474 475/// addSourceLine - Add location information to specified debug information 476/// entry. 477void DwarfDebug::addSourceLine(DIE *Die, const DINameSpace *NS) { 478 // If there is no compile unit specified, don't add a line #. 479 if (!NS->getCompileUnit().Verify()) 480 return; 481 482 unsigned Line = NS->getLineNumber(); 483 StringRef FN = NS->getFilename(); 484 StringRef Dir = NS->getDirectory(); 485 486 unsigned FileID = GetOrCreateSourceID(Dir, FN); 487 assert(FileID && "Invalid file id"); 488 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID); 489 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line); 490} 491 492/* Byref variables, in Blocks, are declared by the programmer as 493 "SomeType VarName;", but the compiler creates a 494 __Block_byref_x_VarName struct, and gives the variable VarName 495 either the struct, or a pointer to the struct, as its type. This 496 is necessary for various behind-the-scenes things the compiler 497 needs to do with by-reference variables in blocks. 498 499 However, as far as the original *programmer* is concerned, the 500 variable should still have type 'SomeType', as originally declared. 501 502 The following function dives into the __Block_byref_x_VarName 503 struct to find the original type of the variable. This will be 504 passed back to the code generating the type for the Debug 505 Information Entry for the variable 'VarName'. 'VarName' will then 506 have the original type 'SomeType' in its debug information. 507 508 The original type 'SomeType' will be the type of the field named 509 'VarName' inside the __Block_byref_x_VarName struct. 510 511 NOTE: In order for this to not completely fail on the debugger 512 side, the Debug Information Entry for the variable VarName needs to 513 have a DW_AT_location that tells the debugger how to unwind through 514 the pointers and __Block_byref_x_VarName struct to find the actual 515 value of the variable. The function addBlockByrefType does this. */ 516 517/// Find the type the programmer originally declared the variable to be 518/// and return that type. 519/// 520DIType DwarfDebug::getBlockByrefType(DIType Ty, std::string Name) { 521 522 DIType subType = Ty; 523 unsigned tag = Ty.getTag(); 524 525 if (tag == dwarf::DW_TAG_pointer_type) { 526 DIDerivedType DTy = DIDerivedType(Ty.getNode()); 527 subType = DTy.getTypeDerivedFrom(); 528 } 529 530 DICompositeType blockStruct = DICompositeType(subType.getNode()); 531 DIArray Elements = blockStruct.getTypeArray(); 532 533 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) { 534 DIDescriptor Element = Elements.getElement(i); 535 DIDerivedType DT = DIDerivedType(Element.getNode()); 536 if (Name == DT.getName()) 537 return (DT.getTypeDerivedFrom()); 538 } 539 540 return Ty; 541} 542 543/// addComplexAddress - Start with the address based on the location provided, 544/// and generate the DWARF information necessary to find the actual variable 545/// given the extra address information encoded in the DIVariable, starting from 546/// the starting location. Add the DWARF information to the die. 547/// 548void DwarfDebug::addComplexAddress(DbgVariable *&DV, DIE *Die, 549 unsigned Attribute, 550 const MachineLocation &Location) { 551 const DIVariable &VD = DV->getVariable(); 552 DIType Ty = VD.getType(); 553 554 // Decode the original location, and use that as the start of the byref 555 // variable's location. 556 unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false); 557 DIEBlock *Block = new (DIEValueAllocator) DIEBlock(); 558 559 if (Location.isReg()) { 560 if (Reg < 32) { 561 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg); 562 } else { 563 Reg = Reg - dwarf::DW_OP_reg0; 564 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg); 565 addUInt(Block, 0, dwarf::DW_FORM_udata, Reg); 566 } 567 } else { 568 if (Reg < 32) 569 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg); 570 else { 571 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx); 572 addUInt(Block, 0, dwarf::DW_FORM_udata, Reg); 573 } 574 575 addUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset()); 576 } 577 578 for (unsigned i = 0, N = VD.getNumAddrElements(); i < N; ++i) { 579 uint64_t Element = VD.getAddrElement(i); 580 581 if (Element == DIFactory::OpPlus) { 582 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst); 583 addUInt(Block, 0, dwarf::DW_FORM_udata, VD.getAddrElement(++i)); 584 } else if (Element == DIFactory::OpDeref) { 585 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref); 586 } else llvm_unreachable("unknown DIFactory Opcode"); 587 } 588 589 // Now attach the location information to the DIE. 590 addBlock(Die, Attribute, 0, Block); 591} 592 593/* Byref variables, in Blocks, are declared by the programmer as "SomeType 594 VarName;", but the compiler creates a __Block_byref_x_VarName struct, and 595 gives the variable VarName either the struct, or a pointer to the struct, as 596 its type. This is necessary for various behind-the-scenes things the 597 compiler needs to do with by-reference variables in Blocks. 598 599 However, as far as the original *programmer* is concerned, the variable 600 should still have type 'SomeType', as originally declared. 601 602 The function getBlockByrefType dives into the __Block_byref_x_VarName 603 struct to find the original type of the variable, which is then assigned to 604 the variable's Debug Information Entry as its real type. So far, so good. 605 However now the debugger will expect the variable VarName to have the type 606 SomeType. So we need the location attribute for the variable to be an 607 expression that explains to the debugger how to navigate through the 608 pointers and struct to find the actual variable of type SomeType. 609 610 The following function does just that. We start by getting 611 the "normal" location for the variable. This will be the location 612 of either the struct __Block_byref_x_VarName or the pointer to the 613 struct __Block_byref_x_VarName. 614 615 The struct will look something like: 616 617 struct __Block_byref_x_VarName { 618 ... <various fields> 619 struct __Block_byref_x_VarName *forwarding; 620 ... <various other fields> 621 SomeType VarName; 622 ... <maybe more fields> 623 }; 624 625 If we are given the struct directly (as our starting point) we 626 need to tell the debugger to: 627 628 1). Add the offset of the forwarding field. 629 630 2). Follow that pointer to get the real __Block_byref_x_VarName 631 struct to use (the real one may have been copied onto the heap). 632 633 3). Add the offset for the field VarName, to find the actual variable. 634 635 If we started with a pointer to the struct, then we need to 636 dereference that pointer first, before the other steps. 637 Translating this into DWARF ops, we will need to append the following 638 to the current location description for the variable: 639 640 DW_OP_deref -- optional, if we start with a pointer 641 DW_OP_plus_uconst <forward_fld_offset> 642 DW_OP_deref 643 DW_OP_plus_uconst <varName_fld_offset> 644 645 That is what this function does. */ 646 647/// addBlockByrefAddress - Start with the address based on the location 648/// provided, and generate the DWARF information necessary to find the 649/// actual Block variable (navigating the Block struct) based on the 650/// starting location. Add the DWARF information to the die. For 651/// more information, read large comment just above here. 652/// 653void DwarfDebug::addBlockByrefAddress(DbgVariable *&DV, DIE *Die, 654 unsigned Attribute, 655 const MachineLocation &Location) { 656 const DIVariable &VD = DV->getVariable(); 657 DIType Ty = VD.getType(); 658 DIType TmpTy = Ty; 659 unsigned Tag = Ty.getTag(); 660 bool isPointer = false; 661 662 StringRef varName = VD.getName(); 663 664 if (Tag == dwarf::DW_TAG_pointer_type) { 665 DIDerivedType DTy = DIDerivedType(Ty.getNode()); 666 TmpTy = DTy.getTypeDerivedFrom(); 667 isPointer = true; 668 } 669 670 DICompositeType blockStruct = DICompositeType(TmpTy.getNode()); 671 672 // Find the __forwarding field and the variable field in the __Block_byref 673 // struct. 674 DIArray Fields = blockStruct.getTypeArray(); 675 DIDescriptor varField = DIDescriptor(); 676 DIDescriptor forwardingField = DIDescriptor(); 677 678 for (unsigned i = 0, N = Fields.getNumElements(); i < N; ++i) { 679 DIDescriptor Element = Fields.getElement(i); 680 DIDerivedType DT = DIDerivedType(Element.getNode()); 681 StringRef fieldName = DT.getName(); 682 if (fieldName == "__forwarding") 683 forwardingField = Element; 684 else if (fieldName == varName) 685 varField = Element; 686 } 687 688 // Get the offsets for the forwarding field and the variable field. 689 unsigned forwardingFieldOffset = 690 DIDerivedType(forwardingField.getNode()).getOffsetInBits() >> 3; 691 unsigned varFieldOffset = 692 DIDerivedType(varField.getNode()).getOffsetInBits() >> 3; 693 694 // Decode the original location, and use that as the start of the byref 695 // variable's location. 696 unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false); 697 DIEBlock *Block = new (DIEValueAllocator) DIEBlock(); 698 699 if (Location.isReg()) { 700 if (Reg < 32) 701 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg); 702 else { 703 Reg = Reg - dwarf::DW_OP_reg0; 704 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg); 705 addUInt(Block, 0, dwarf::DW_FORM_udata, Reg); 706 } 707 } else { 708 if (Reg < 32) 709 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg); 710 else { 711 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx); 712 addUInt(Block, 0, dwarf::DW_FORM_udata, Reg); 713 } 714 715 addUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset()); 716 } 717 718 // If we started with a pointer to the __Block_byref... struct, then 719 // the first thing we need to do is dereference the pointer (DW_OP_deref). 720 if (isPointer) 721 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref); 722 723 // Next add the offset for the '__forwarding' field: 724 // DW_OP_plus_uconst ForwardingFieldOffset. Note there's no point in 725 // adding the offset if it's 0. 726 if (forwardingFieldOffset > 0) { 727 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst); 728 addUInt(Block, 0, dwarf::DW_FORM_udata, forwardingFieldOffset); 729 } 730 731 // Now dereference the __forwarding field to get to the real __Block_byref 732 // struct: DW_OP_deref. 733 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref); 734 735 // Now that we've got the real __Block_byref... struct, add the offset 736 // for the variable's field to get to the location of the actual variable: 737 // DW_OP_plus_uconst varFieldOffset. Again, don't add if it's 0. 738 if (varFieldOffset > 0) { 739 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst); 740 addUInt(Block, 0, dwarf::DW_FORM_udata, varFieldOffset); 741 } 742 743 // Now attach the location information to the DIE. 744 addBlock(Die, Attribute, 0, Block); 745} 746 747/// addAddress - Add an address attribute to a die based on the location 748/// provided. 749void DwarfDebug::addAddress(DIE *Die, unsigned Attribute, 750 const MachineLocation &Location) { 751 unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false); 752 DIEBlock *Block = new (DIEValueAllocator) DIEBlock(); 753 754 if (Location.isReg()) { 755 if (Reg < 32) { 756 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg); 757 } else { 758 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_regx); 759 addUInt(Block, 0, dwarf::DW_FORM_udata, Reg); 760 } 761 } else { 762 if (Reg < 32) { 763 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg); 764 } else { 765 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx); 766 addUInt(Block, 0, dwarf::DW_FORM_udata, Reg); 767 } 768 769 addUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset()); 770 } 771 772 addBlock(Die, Attribute, 0, Block); 773} 774 775/// addToContextOwner - Add Die into the list of its context owner's children. 776void DwarfDebug::addToContextOwner(DIE *Die, DIDescriptor Context) { 777 if (Context.isType()) { 778 DIE *ContextDIE = getOrCreateTypeDIE(DIType(Context.getNode())); 779 ContextDIE->addChild(Die); 780 } else if (Context.isNameSpace()) { 781 DIE *ContextDIE = getOrCreateNameSpace(DINameSpace(Context.getNode())); 782 ContextDIE->addChild(Die); 783 } else if (DIE *ContextDIE = ModuleCU->getDIE(Context.getNode())) 784 ContextDIE->addChild(Die); 785 else 786 ModuleCU->addDie(Die); 787} 788 789/// getOrCreateTypeDIE - Find existing DIE or create new DIE for the 790/// given DIType. 791DIE *DwarfDebug::getOrCreateTypeDIE(DIType Ty) { 792 DIE *TyDIE = ModuleCU->getDIE(Ty.getNode()); 793 if (TyDIE) 794 return TyDIE; 795 796 // Create new type. 797 TyDIE = new DIE(dwarf::DW_TAG_base_type); 798 ModuleCU->insertDIE(Ty.getNode(), TyDIE); 799 if (Ty.isBasicType()) 800 constructTypeDIE(*TyDIE, DIBasicType(Ty.getNode())); 801 else if (Ty.isCompositeType()) 802 constructTypeDIE(*TyDIE, DICompositeType(Ty.getNode())); 803 else { 804 assert(Ty.isDerivedType() && "Unknown kind of DIType"); 805 constructTypeDIE(*TyDIE, DIDerivedType(Ty.getNode())); 806 } 807 808 addToContextOwner(TyDIE, Ty.getContext()); 809 return TyDIE; 810} 811 812/// addType - Add a new type attribute to the specified entity. 813void DwarfDebug::addType(DIE *Entity, DIType Ty) { 814 if (!Ty.isValid()) 815 return; 816 817 // Check for pre-existence. 818 DIEEntry *Entry = ModuleCU->getDIEEntry(Ty.getNode()); 819 // If it exists then use the existing value. 820 if (Entry) { 821 Entity->addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, Entry); 822 return; 823 } 824 825 // Construct type. 826 DIE *Buffer = getOrCreateTypeDIE(Ty); 827 828 // Set up proxy. 829 Entry = createDIEEntry(Buffer); 830 ModuleCU->insertDIEEntry(Ty.getNode(), Entry); 831 832 Entity->addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, Entry); 833} 834 835/// constructTypeDIE - Construct basic type die from DIBasicType. 836void DwarfDebug::constructTypeDIE(DIE &Buffer, DIBasicType BTy) { 837 // Get core information. 838 StringRef Name = BTy.getName(); 839 Buffer.setTag(dwarf::DW_TAG_base_type); 840 addUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1, 841 BTy.getEncoding()); 842 843 // Add name if not anonymous or intermediate type. 844 if (!Name.empty()) 845 addString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name); 846 uint64_t Size = BTy.getSizeInBits() >> 3; 847 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size); 848} 849 850/// constructTypeDIE - Construct derived type die from DIDerivedType. 851void DwarfDebug::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) { 852 // Get core information. 853 StringRef Name = DTy.getName(); 854 uint64_t Size = DTy.getSizeInBits() >> 3; 855 unsigned Tag = DTy.getTag(); 856 857 // FIXME - Workaround for templates. 858 if (Tag == dwarf::DW_TAG_inheritance) Tag = dwarf::DW_TAG_reference_type; 859 860 Buffer.setTag(Tag); 861 862 // Map to main type, void will not have a type. 863 DIType FromTy = DTy.getTypeDerivedFrom(); 864 addType(&Buffer, FromTy); 865 866 // Add name if not anonymous or intermediate type. 867 if (!Name.empty()) 868 addString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name); 869 870 // Add size if non-zero (derived types might be zero-sized.) 871 if (Size) 872 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size); 873 874 // Add source line info if available and TyDesc is not a forward declaration. 875 if (!DTy.isForwardDecl()) 876 addSourceLine(&Buffer, &DTy); 877} 878 879/// constructTypeDIE - Construct type DIE from DICompositeType. 880void DwarfDebug::constructTypeDIE(DIE &Buffer, DICompositeType CTy) { 881 // Get core information. 882 StringRef Name = CTy.getName(); 883 884 uint64_t Size = CTy.getSizeInBits() >> 3; 885 unsigned Tag = CTy.getTag(); 886 Buffer.setTag(Tag); 887 888 switch (Tag) { 889 case dwarf::DW_TAG_vector_type: 890 case dwarf::DW_TAG_array_type: 891 constructArrayTypeDIE(Buffer, &CTy); 892 break; 893 case dwarf::DW_TAG_enumeration_type: { 894 DIArray Elements = CTy.getTypeArray(); 895 896 // Add enumerators to enumeration type. 897 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) { 898 DIE *ElemDie = NULL; 899 DIDescriptor Enum(Elements.getElement(i).getNode()); 900 if (Enum.isEnumerator()) { 901 ElemDie = constructEnumTypeDIE(DIEnumerator(Enum.getNode())); 902 Buffer.addChild(ElemDie); 903 } 904 } 905 } 906 break; 907 case dwarf::DW_TAG_subroutine_type: { 908 // Add return type. 909 DIArray Elements = CTy.getTypeArray(); 910 DIDescriptor RTy = Elements.getElement(0); 911 addType(&Buffer, DIType(RTy.getNode())); 912 913 // Add prototype flag. 914 addUInt(&Buffer, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1); 915 916 // Add arguments. 917 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) { 918 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter); 919 DIDescriptor Ty = Elements.getElement(i); 920 addType(Arg, DIType(Ty.getNode())); 921 Buffer.addChild(Arg); 922 } 923 } 924 break; 925 case dwarf::DW_TAG_structure_type: 926 case dwarf::DW_TAG_union_type: 927 case dwarf::DW_TAG_class_type: { 928 // Add elements to structure type. 929 DIArray Elements = CTy.getTypeArray(); 930 931 // A forward struct declared type may not have elements available. 932 unsigned N = Elements.getNumElements(); 933 if (N == 0) 934 break; 935 936 // Add elements to structure type. 937 for (unsigned i = 0; i < N; ++i) { 938 DIDescriptor Element = Elements.getElement(i); 939 DIE *ElemDie = NULL; 940 if (Element.isSubprogram()) 941 ElemDie = createSubprogramDIE(DISubprogram(Element.getNode())); 942 else if (Element.isVariable()) { 943 DIVariable DV(Element.getNode()); 944 ElemDie = new DIE(dwarf::DW_TAG_variable); 945 addString(ElemDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, 946 DV.getName()); 947 addType(ElemDie, DV.getType()); 948 addUInt(ElemDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1); 949 addUInt(ElemDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1); 950 addSourceLine(ElemDie, &DV); 951 } else if (Element.isDerivedType()) 952 ElemDie = createMemberDIE(DIDerivedType(Element.getNode())); 953 else 954 continue; 955 Buffer.addChild(ElemDie); 956 } 957 958 if (CTy.isAppleBlockExtension()) 959 addUInt(&Buffer, dwarf::DW_AT_APPLE_block, dwarf::DW_FORM_flag, 1); 960 961 unsigned RLang = CTy.getRunTimeLang(); 962 if (RLang) 963 addUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class, 964 dwarf::DW_FORM_data1, RLang); 965 966 DICompositeType ContainingType = CTy.getContainingType(); 967 if (DIDescriptor(ContainingType.getNode()).isCompositeType()) 968 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4, 969 getOrCreateTypeDIE(DIType(ContainingType.getNode()))); 970 break; 971 } 972 default: 973 break; 974 } 975 976 // Add name if not anonymous or intermediate type. 977 if (!Name.empty()) 978 addString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name); 979 980 if (Tag == dwarf::DW_TAG_enumeration_type || Tag == dwarf::DW_TAG_class_type || 981 Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type) { 982 // Add size if non-zero (derived types might be zero-sized.) 983 if (Size) 984 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size); 985 else { 986 // Add zero size if it is not a forward declaration. 987 if (CTy.isForwardDecl()) 988 addUInt(&Buffer, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1); 989 else 990 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, 0); 991 } 992 993 // Add source line info if available. 994 if (!CTy.isForwardDecl()) 995 addSourceLine(&Buffer, &CTy); 996 } 997} 998 999/// constructSubrangeDIE - Construct subrange DIE from DISubrange. 1000void DwarfDebug::constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy){ 1001 int64_t L = SR.getLo(); 1002 int64_t H = SR.getHi(); 1003 DIE *DW_Subrange = new DIE(dwarf::DW_TAG_subrange_type); 1004 1005 addDIEEntry(DW_Subrange, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, IndexTy); 1006 if (L) 1007 addSInt(DW_Subrange, dwarf::DW_AT_lower_bound, 0, L); 1008 addSInt(DW_Subrange, dwarf::DW_AT_upper_bound, 0, H); 1009 1010 Buffer.addChild(DW_Subrange); 1011} 1012 1013/// constructArrayTypeDIE - Construct array type DIE from DICompositeType. 1014void DwarfDebug::constructArrayTypeDIE(DIE &Buffer, 1015 DICompositeType *CTy) { 1016 Buffer.setTag(dwarf::DW_TAG_array_type); 1017 if (CTy->getTag() == dwarf::DW_TAG_vector_type) 1018 addUInt(&Buffer, dwarf::DW_AT_GNU_vector, dwarf::DW_FORM_flag, 1); 1019 1020 // Emit derived type. 1021 addType(&Buffer, CTy->getTypeDerivedFrom()); 1022 DIArray Elements = CTy->getTypeArray(); 1023 1024 // Get an anonymous type for index type. 1025 DIE *IdxTy = ModuleCU->getIndexTyDie(); 1026 if (!IdxTy) { 1027 // Construct an anonymous type for index type. 1028 IdxTy = new DIE(dwarf::DW_TAG_base_type); 1029 addUInt(IdxTy, dwarf::DW_AT_byte_size, 0, sizeof(int32_t)); 1030 addUInt(IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1, 1031 dwarf::DW_ATE_signed); 1032 ModuleCU->addDie(IdxTy); 1033 ModuleCU->setIndexTyDie(IdxTy); 1034 } 1035 1036 // Add subranges to array type. 1037 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) { 1038 DIDescriptor Element = Elements.getElement(i); 1039 if (Element.getTag() == dwarf::DW_TAG_subrange_type) 1040 constructSubrangeDIE(Buffer, DISubrange(Element.getNode()), IdxTy); 1041 } 1042} 1043 1044/// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator. 1045DIE *DwarfDebug::constructEnumTypeDIE(DIEnumerator ETy) { 1046 DIE *Enumerator = new DIE(dwarf::DW_TAG_enumerator); 1047 StringRef Name = ETy.getName(); 1048 addString(Enumerator, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name); 1049 int64_t Value = ETy.getEnumValue(); 1050 addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, Value); 1051 return Enumerator; 1052} 1053 1054/// getRealLinkageName - If special LLVM prefix that is used to inform the asm 1055/// printer to not emit usual symbol prefix before the symbol name is used then 1056/// return linkage name after skipping this special LLVM prefix. 1057static StringRef getRealLinkageName(StringRef LinkageName) { 1058 char One = '\1'; 1059 if (LinkageName.startswith(StringRef(&One, 1))) 1060 return LinkageName.substr(1); 1061 return LinkageName; 1062} 1063 1064/// createGlobalVariableDIE - Create new DIE using GV. 1065DIE *DwarfDebug::createGlobalVariableDIE(const DIGlobalVariable &GV) { 1066 // If the global variable was optmized out then no need to create debug info 1067 // entry. 1068 if (!GV.getGlobal()) return NULL; 1069 if (GV.getDisplayName().empty()) return NULL; 1070 1071 DIE *GVDie = new DIE(dwarf::DW_TAG_variable); 1072 addString(GVDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, 1073 GV.getDisplayName()); 1074 1075 StringRef LinkageName = GV.getLinkageName(); 1076 if (!LinkageName.empty()) 1077 addString(GVDie, dwarf::DW_AT_MIPS_linkage_name, dwarf::DW_FORM_string, 1078 getRealLinkageName(LinkageName)); 1079 1080 addType(GVDie, GV.getType()); 1081 if (!GV.isLocalToUnit()) 1082 addUInt(GVDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1); 1083 addSourceLine(GVDie, &GV); 1084 1085 return GVDie; 1086} 1087 1088/// createMemberDIE - Create new member DIE. 1089DIE *DwarfDebug::createMemberDIE(const DIDerivedType &DT) { 1090 DIE *MemberDie = new DIE(DT.getTag()); 1091 StringRef Name = DT.getName(); 1092 if (!Name.empty()) 1093 addString(MemberDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name); 1094 1095 addType(MemberDie, DT.getTypeDerivedFrom()); 1096 1097 addSourceLine(MemberDie, &DT); 1098 1099 DIEBlock *MemLocationDie = new (DIEValueAllocator) DIEBlock(); 1100 addUInt(MemLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst); 1101 1102 uint64_t Size = DT.getSizeInBits(); 1103 uint64_t FieldSize = DT.getOriginalTypeSize(); 1104 1105 if (Size != FieldSize) { 1106 // Handle bitfield. 1107 addUInt(MemberDie, dwarf::DW_AT_byte_size, 0, DT.getOriginalTypeSize()>>3); 1108 addUInt(MemberDie, dwarf::DW_AT_bit_size, 0, DT.getSizeInBits()); 1109 1110 uint64_t Offset = DT.getOffsetInBits(); 1111 uint64_t AlignMask = ~(DT.getAlignInBits() - 1); 1112 uint64_t HiMark = (Offset + FieldSize) & AlignMask; 1113 uint64_t FieldOffset = (HiMark - FieldSize); 1114 Offset -= FieldOffset; 1115 1116 // Maybe we need to work from the other end. 1117 if (TD->isLittleEndian()) Offset = FieldSize - (Offset + Size); 1118 addUInt(MemberDie, dwarf::DW_AT_bit_offset, 0, Offset); 1119 1120 // Here WD_AT_data_member_location points to the anonymous 1121 // field that includes this bit field. 1122 addUInt(MemLocationDie, 0, dwarf::DW_FORM_udata, FieldOffset >> 3); 1123 1124 } else 1125 // This is not a bitfield. 1126 addUInt(MemLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits() >> 3); 1127 1128 if (DT.getTag() == dwarf::DW_TAG_inheritance 1129 && DT.isVirtual()) { 1130 1131 // For C++, virtual base classes are not at fixed offset. Use following 1132 // expression to extract appropriate offset from vtable. 1133 // BaseAddr = ObAddr + *((*ObAddr) - Offset) 1134 1135 DIEBlock *VBaseLocationDie = new (DIEValueAllocator) DIEBlock(); 1136 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_dup); 1137 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref); 1138 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu); 1139 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits()); 1140 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_minus); 1141 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref); 1142 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus); 1143 1144 addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0, 1145 VBaseLocationDie); 1146 } else 1147 addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0, MemLocationDie); 1148 1149 if (DT.isProtected()) 1150 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag, 1151 dwarf::DW_ACCESS_protected); 1152 else if (DT.isPrivate()) 1153 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag, 1154 dwarf::DW_ACCESS_private); 1155 else if (DT.getTag() == dwarf::DW_TAG_inheritance) 1156 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag, 1157 dwarf::DW_ACCESS_public); 1158 if (DT.isVirtual()) 1159 addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_flag, 1160 dwarf::DW_VIRTUALITY_virtual); 1161 return MemberDie; 1162} 1163 1164/// createSubprogramDIE - Create new DIE using SP. 1165DIE *DwarfDebug::createSubprogramDIE(const DISubprogram &SP, bool MakeDecl) { 1166 DIE *SPDie = ModuleCU->getDIE(SP.getNode()); 1167 if (SPDie) 1168 return SPDie; 1169 1170 SPDie = new DIE(dwarf::DW_TAG_subprogram); 1171 // Constructors and operators for anonymous aggregates do not have names. 1172 if (!SP.getName().empty()) 1173 addString(SPDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, SP.getName()); 1174 1175 StringRef LinkageName = SP.getLinkageName(); 1176 if (!LinkageName.empty()) 1177 addString(SPDie, dwarf::DW_AT_MIPS_linkage_name, dwarf::DW_FORM_string, 1178 getRealLinkageName(LinkageName)); 1179 1180 addSourceLine(SPDie, &SP); 1181 1182 // Add prototyped tag, if C or ObjC. 1183 unsigned Lang = SP.getCompileUnit().getLanguage(); 1184 if (Lang == dwarf::DW_LANG_C99 || Lang == dwarf::DW_LANG_C89 || 1185 Lang == dwarf::DW_LANG_ObjC) 1186 addUInt(SPDie, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1); 1187 1188 // Add Return Type. 1189 DICompositeType SPTy = SP.getType(); 1190 DIArray Args = SPTy.getTypeArray(); 1191 unsigned SPTag = SPTy.getTag(); 1192 1193 if (Args.getNumElements() == 0 || SPTag != dwarf::DW_TAG_subroutine_type) 1194 addType(SPDie, SPTy); 1195 else 1196 addType(SPDie, DIType(Args.getElement(0).getNode())); 1197 1198 unsigned VK = SP.getVirtuality(); 1199 if (VK) { 1200 addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_flag, VK); 1201 DIEBlock *Block = new (DIEValueAllocator) DIEBlock(); 1202 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu); 1203 addUInt(Block, 0, dwarf::DW_FORM_data1, SP.getVirtualIndex()); 1204 addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, 0, Block); 1205 ContainingTypeMap.insert(std::make_pair(SPDie, 1206 SP.getContainingType().getNode())); 1207 } 1208 1209 if (MakeDecl || !SP.isDefinition()) { 1210 addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1); 1211 1212 // Add arguments. Do not add arguments for subprogram definition. They will 1213 // be handled while processing variables. 1214 DICompositeType SPTy = SP.getType(); 1215 DIArray Args = SPTy.getTypeArray(); 1216 unsigned SPTag = SPTy.getTag(); 1217 1218 if (SPTag == dwarf::DW_TAG_subroutine_type) 1219 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) { 1220 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter); 1221 DIType ATy = DIType(DIType(Args.getElement(i).getNode())); 1222 addType(Arg, ATy); 1223 if (ATy.isArtificial()) 1224 addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1); 1225 SPDie->addChild(Arg); 1226 } 1227 } 1228 1229 if (SP.isArtificial()) 1230 addUInt(SPDie, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1); 1231 1232 // DW_TAG_inlined_subroutine may refer to this DIE. 1233 ModuleCU->insertDIE(SP.getNode(), SPDie); 1234 return SPDie; 1235} 1236 1237/// getUpdatedDbgScope - Find DbgScope assicated with the instruction. 1238/// Update scope hierarchy. Create abstract scope if required. 1239DbgScope *DwarfDebug::getUpdatedDbgScope(MDNode *N, const MachineInstr *MI, 1240 MDNode *InlinedAt) { 1241 assert(N && "Invalid Scope encoding!"); 1242 assert(MI && "Missing machine instruction!"); 1243 bool isAConcreteScope = InlinedAt != 0; 1244 1245 DbgScope *NScope = NULL; 1246 1247 if (InlinedAt) 1248 NScope = DbgScopeMap.lookup(InlinedAt); 1249 else 1250 NScope = DbgScopeMap.lookup(N); 1251 assert(NScope && "Unable to find working scope!"); 1252 1253 if (NScope->getFirstInsn()) 1254 return NScope; 1255 1256 DbgScope *Parent = NULL; 1257 if (isAConcreteScope) { 1258 DILocation IL(InlinedAt); 1259 Parent = getUpdatedDbgScope(IL.getScope().getNode(), MI, 1260 IL.getOrigLocation().getNode()); 1261 assert(Parent && "Unable to find Parent scope!"); 1262 NScope->setParent(Parent); 1263 Parent->addScope(NScope); 1264 } else if (DIDescriptor(N).isLexicalBlock()) { 1265 DILexicalBlock DB(N); 1266 Parent = getUpdatedDbgScope(DB.getContext().getNode(), MI, InlinedAt); 1267 NScope->setParent(Parent); 1268 Parent->addScope(NScope); 1269 } 1270 1271 NScope->setFirstInsn(MI); 1272 1273 if (!Parent && !InlinedAt) { 1274 StringRef SPName = DISubprogram(N).getLinkageName(); 1275 if (SPName == MF->getFunction()->getName()) 1276 CurrentFnDbgScope = NScope; 1277 } 1278 1279 if (isAConcreteScope) { 1280 ConcreteScopes[InlinedAt] = NScope; 1281 getOrCreateAbstractScope(N); 1282 } 1283 1284 return NScope; 1285} 1286 1287DbgScope *DwarfDebug::getOrCreateAbstractScope(MDNode *N) { 1288 assert(N && "Invalid Scope encoding!"); 1289 1290 DbgScope *AScope = AbstractScopes.lookup(N); 1291 if (AScope) 1292 return AScope; 1293 1294 DbgScope *Parent = NULL; 1295 1296 DIDescriptor Scope(N); 1297 if (Scope.isLexicalBlock()) { 1298 DILexicalBlock DB(N); 1299 DIDescriptor ParentDesc = DB.getContext(); 1300 Parent = getOrCreateAbstractScope(ParentDesc.getNode()); 1301 } 1302 1303 AScope = new DbgScope(Parent, DIDescriptor(N), NULL); 1304 1305 if (Parent) 1306 Parent->addScope(AScope); 1307 AScope->setAbstractScope(); 1308 AbstractScopes[N] = AScope; 1309 if (DIDescriptor(N).isSubprogram()) 1310 AbstractScopesList.push_back(AScope); 1311 return AScope; 1312} 1313 1314/// updateSubprogramScopeDIE - Find DIE for the given subprogram and 1315/// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes. 1316/// If there are global variables in this scope then create and insert 1317/// DIEs for these variables. 1318DIE *DwarfDebug::updateSubprogramScopeDIE(MDNode *SPNode) { 1319 DIE *SPDie = ModuleCU->getDIE(SPNode); 1320 assert(SPDie && "Unable to find subprogram DIE!"); 1321 DISubprogram SP(SPNode); 1322 1323 // There is not any need to generate specification DIE for a function 1324 // defined at compile unit level. If a function is defined inside another 1325 // function then gdb prefers the definition at top level and but does not 1326 // expect specification DIE in parent function. So avoid creating 1327 // specification DIE for a function defined inside a function. 1328 if (SP.isDefinition() && !SP.getContext().isCompileUnit() && 1329 !SP.getContext().isFile() && !SP.getContext().isSubprogram()) { 1330 addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1); 1331 1332 // Add arguments. 1333 DICompositeType SPTy = SP.getType(); 1334 DIArray Args = SPTy.getTypeArray(); 1335 unsigned SPTag = SPTy.getTag(); 1336 if (SPTag == dwarf::DW_TAG_subroutine_type) 1337 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) { 1338 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter); 1339 DIType ATy = DIType(DIType(Args.getElement(i).getNode())); 1340 addType(Arg, ATy); 1341 if (ATy.isArtificial()) 1342 addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1); 1343 SPDie->addChild(Arg); 1344 } 1345 DIE *SPDeclDie = SPDie; 1346 SPDie = new DIE(dwarf::DW_TAG_subprogram); 1347 addDIEEntry(SPDie, dwarf::DW_AT_specification, dwarf::DW_FORM_ref4, 1348 SPDeclDie); 1349 ModuleCU->addDie(SPDie); 1350 } 1351 1352 addLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, 1353 getDWLabel("func_begin", SubprogramCount)); 1354 addLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr, 1355 getDWLabel("func_end", SubprogramCount)); 1356 MachineLocation Location(RI->getFrameRegister(*MF)); 1357 addAddress(SPDie, dwarf::DW_AT_frame_base, Location); 1358 1359 if (!DISubprogram(SPNode).isLocalToUnit()) 1360 addUInt(SPDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1); 1361 1362 return SPDie; 1363} 1364 1365/// constructLexicalScope - Construct new DW_TAG_lexical_block 1366/// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels. 1367DIE *DwarfDebug::constructLexicalScopeDIE(DbgScope *Scope) { 1368 MCSymbol *Start = Scope->getStartLabel(); 1369 MCSymbol *End = Scope->getEndLabel(); 1370 if (Start == 0 || End == 0) return 0; 1371 1372 assert(Start->isDefined() && "Invalid starting label for an inlined scope!"); 1373 assert(End->isDefined() && "Invalid end label for an inlined scope!"); 1374 1375 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_lexical_block); 1376 if (Scope->isAbstractScope()) 1377 return ScopeDIE; 1378 1379 addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, 1380 Start ? Start : getDWLabel("func_begin", SubprogramCount)); 1381 addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr, 1382 End ? End : getDWLabel("func_end", SubprogramCount)); 1383 1384 return ScopeDIE; 1385} 1386 1387/// constructInlinedScopeDIE - This scope represents inlined body of 1388/// a function. Construct DIE to represent this concrete inlined copy 1389/// of the function. 1390DIE *DwarfDebug::constructInlinedScopeDIE(DbgScope *Scope) { 1391 MCSymbol *StartLabel = Scope->getStartLabel(); 1392 MCSymbol *EndLabel = Scope->getEndLabel(); 1393 if (StartLabel == 0 || EndLabel == 0) return 0; 1394 1395 assert(StartLabel->isDefined() && 1396 "Invalid starting label for an inlined scope!"); 1397 assert(EndLabel->isDefined() && 1398 "Invalid end label for an inlined scope!"); 1399 if (!Scope->getScopeNode()) 1400 return NULL; 1401 DIScope DS(Scope->getScopeNode()); 1402 DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine); 1403 1404 DISubprogram InlinedSP = getDISubprogram(DS.getNode()); 1405 DIE *OriginDIE = ModuleCU->getDIE(InlinedSP.getNode()); 1406 assert(OriginDIE && "Unable to find Origin DIE!"); 1407 addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin, 1408 dwarf::DW_FORM_ref4, OriginDIE); 1409 1410 addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, StartLabel); 1411 addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr, EndLabel); 1412 1413 InlinedSubprogramDIEs.insert(OriginDIE); 1414 1415 // Track the start label for this inlined function. 1416 DenseMap<MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator 1417 I = InlineInfo.find(InlinedSP.getNode()); 1418 1419 if (I == InlineInfo.end()) { 1420 InlineInfo[InlinedSP.getNode()].push_back(std::make_pair(StartLabel, 1421 ScopeDIE)); 1422 InlinedSPNodes.push_back(InlinedSP.getNode()); 1423 } else 1424 I->second.push_back(std::make_pair(StartLabel, ScopeDIE)); 1425 1426 DILocation DL(Scope->getInlinedAt()); 1427 addUInt(ScopeDIE, dwarf::DW_AT_call_file, 0, ModuleCU->getID()); 1428 addUInt(ScopeDIE, dwarf::DW_AT_call_line, 0, DL.getLineNumber()); 1429 1430 return ScopeDIE; 1431} 1432 1433 1434/// constructVariableDIE - Construct a DIE for the given DbgVariable. 1435DIE *DwarfDebug::constructVariableDIE(DbgVariable *DV, DbgScope *Scope) { 1436 // Get the descriptor. 1437 const DIVariable &VD = DV->getVariable(); 1438 StringRef Name = VD.getName(); 1439 if (Name.empty()) 1440 return NULL; 1441 1442 // Translate tag to proper Dwarf tag. The result variable is dropped for 1443 // now. 1444 unsigned Tag; 1445 switch (VD.getTag()) { 1446 case dwarf::DW_TAG_return_variable: 1447 return NULL; 1448 case dwarf::DW_TAG_arg_variable: 1449 Tag = dwarf::DW_TAG_formal_parameter; 1450 break; 1451 case dwarf::DW_TAG_auto_variable: // fall thru 1452 default: 1453 Tag = dwarf::DW_TAG_variable; 1454 break; 1455 } 1456 1457 // Define variable debug information entry. 1458 DIE *VariableDie = new DIE(Tag); 1459 1460 1461 DIE *AbsDIE = NULL; 1462 if (DbgVariable *AV = DV->getAbstractVariable()) 1463 AbsDIE = AV->getDIE(); 1464 1465 if (AbsDIE) { 1466 DIScope DS(Scope->getScopeNode()); 1467 DISubprogram InlinedSP = getDISubprogram(DS.getNode()); 1468 DIE *OriginSPDIE = ModuleCU->getDIE(InlinedSP.getNode()); 1469 (void) OriginSPDIE; 1470 assert(OriginSPDIE && "Unable to find Origin DIE for the SP!"); 1471 DIE *AbsDIE = DV->getAbstractVariable()->getDIE(); 1472 assert(AbsDIE && "Unable to find Origin DIE for the Variable!"); 1473 addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin, 1474 dwarf::DW_FORM_ref4, AbsDIE); 1475 } 1476 else { 1477 addString(VariableDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name); 1478 addSourceLine(VariableDie, &VD); 1479 1480 // Add variable type. 1481 // FIXME: isBlockByrefVariable should be reformulated in terms of complex 1482 // addresses instead. 1483 if (VD.isBlockByrefVariable()) 1484 addType(VariableDie, getBlockByrefType(VD.getType(), Name)); 1485 else 1486 addType(VariableDie, VD.getType()); 1487 } 1488 1489 // Add variable address. 1490 if (!Scope->isAbstractScope()) { 1491 // Check if variable is described by DBG_VALUE instruction. 1492 if (const MachineInstr *DbgValueInsn = DV->getDbgValue()) { 1493 if (DbgValueInsn->getNumOperands() == 3) { 1494 // FIXME : Handle getNumOperands != 3 1495 if (DbgValueInsn->getOperand(0).getType() 1496 == MachineOperand::MO_Register 1497 && DbgValueInsn->getOperand(0).getReg()) { 1498 MachineLocation Location; 1499 Location.set(DbgValueInsn->getOperand(0).getReg()); 1500 addAddress(VariableDie, dwarf::DW_AT_location, Location); 1501 if (MCSymbol *VS = DV->getDbgValueLabel()) 1502 addLabel(VariableDie, dwarf::DW_AT_start_scope, dwarf::DW_FORM_addr, 1503 VS); 1504 } else if (DbgValueInsn->getOperand(0).getType() == 1505 MachineOperand::MO_Immediate) { 1506 DIEBlock *Block = new (DIEValueAllocator) DIEBlock(); 1507 unsigned Imm = DbgValueInsn->getOperand(0).getImm(); 1508 addUInt(Block, 0, dwarf::DW_FORM_udata, Imm); 1509 addBlock(VariableDie, dwarf::DW_AT_const_value, 0, Block); 1510 if (MCSymbol *VS = DV->getDbgValueLabel()) 1511 addLabel(VariableDie, dwarf::DW_AT_start_scope, dwarf::DW_FORM_addr, 1512 VS); 1513 } else { 1514 //FIXME : Handle other operand types. 1515 delete VariableDie; 1516 return NULL; 1517 } 1518 } 1519 } else { 1520 MachineLocation Location; 1521 unsigned FrameReg; 1522 int Offset = RI->getFrameIndexReference(*MF, DV->getFrameIndex(), 1523 FrameReg); 1524 Location.set(FrameReg, Offset); 1525 1526 if (VD.hasComplexAddress()) 1527 addComplexAddress(DV, VariableDie, dwarf::DW_AT_location, Location); 1528 else if (VD.isBlockByrefVariable()) 1529 addBlockByrefAddress(DV, VariableDie, dwarf::DW_AT_location, Location); 1530 else 1531 addAddress(VariableDie, dwarf::DW_AT_location, Location); 1532 } 1533 } 1534 1535 if (Tag == dwarf::DW_TAG_formal_parameter && VD.getType().isArtificial()) 1536 addUInt(VariableDie, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1); 1537 DV->setDIE(VariableDie); 1538 return VariableDie; 1539 1540} 1541 1542void DwarfDebug::addPubTypes(DISubprogram SP) { 1543 DICompositeType SPTy = SP.getType(); 1544 unsigned SPTag = SPTy.getTag(); 1545 if (SPTag != dwarf::DW_TAG_subroutine_type) 1546 return; 1547 1548 DIArray Args = SPTy.getTypeArray(); 1549 for (unsigned i = 0, e = Args.getNumElements(); i != e; ++i) { 1550 DIType ATy(Args.getElement(i).getNode()); 1551 if (!ATy.isValid()) 1552 continue; 1553 DICompositeType CATy = getDICompositeType(ATy); 1554 if (DIDescriptor(CATy.getNode()).Verify() && !CATy.getName().empty()) { 1555 if (DIEEntry *Entry = ModuleCU->getDIEEntry(CATy.getNode())) 1556 ModuleCU->addGlobalType(CATy.getName(), Entry->getEntry()); 1557 } 1558 } 1559} 1560 1561/// constructScopeDIE - Construct a DIE for this scope. 1562DIE *DwarfDebug::constructScopeDIE(DbgScope *Scope) { 1563 if (!Scope || !Scope->getScopeNode()) 1564 return NULL; 1565 1566 DIScope DS(Scope->getScopeNode()); 1567 DIE *ScopeDIE = NULL; 1568 if (Scope->getInlinedAt()) 1569 ScopeDIE = constructInlinedScopeDIE(Scope); 1570 else if (DS.isSubprogram()) { 1571 if (Scope->isAbstractScope()) 1572 ScopeDIE = ModuleCU->getDIE(DS.getNode()); 1573 else 1574 ScopeDIE = updateSubprogramScopeDIE(DS.getNode()); 1575 } 1576 else 1577 ScopeDIE = constructLexicalScopeDIE(Scope); 1578 if (!ScopeDIE) return NULL; 1579 1580 // Add variables to scope. 1581 const SmallVector<DbgVariable *, 8> &Variables = Scope->getVariables(); 1582 for (unsigned i = 0, N = Variables.size(); i < N; ++i) { 1583 DIE *VariableDIE = constructVariableDIE(Variables[i], Scope); 1584 if (VariableDIE) 1585 ScopeDIE->addChild(VariableDIE); 1586 } 1587 1588 // Add nested scopes. 1589 const SmallVector<DbgScope *, 4> &Scopes = Scope->getScopes(); 1590 for (unsigned j = 0, M = Scopes.size(); j < M; ++j) { 1591 // Define the Scope debug information entry. 1592 DIE *NestedDIE = constructScopeDIE(Scopes[j]); 1593 if (NestedDIE) 1594 ScopeDIE->addChild(NestedDIE); 1595 } 1596 1597 if (DS.isSubprogram()) 1598 addPubTypes(DISubprogram(DS.getNode())); 1599 1600 return ScopeDIE; 1601} 1602 1603/// GetOrCreateSourceID - Look up the source id with the given directory and 1604/// source file names. If none currently exists, create a new id and insert it 1605/// in the SourceIds map. This can update DirectoryNames and SourceFileNames 1606/// maps as well. 1607unsigned DwarfDebug::GetOrCreateSourceID(StringRef DirName, StringRef FileName){ 1608 unsigned DId; 1609 StringMap<unsigned>::iterator DI = DirectoryIdMap.find(DirName); 1610 if (DI != DirectoryIdMap.end()) { 1611 DId = DI->getValue(); 1612 } else { 1613 DId = DirectoryNames.size() + 1; 1614 DirectoryIdMap[DirName] = DId; 1615 DirectoryNames.push_back(DirName); 1616 } 1617 1618 unsigned FId; 1619 StringMap<unsigned>::iterator FI = SourceFileIdMap.find(FileName); 1620 if (FI != SourceFileIdMap.end()) { 1621 FId = FI->getValue(); 1622 } else { 1623 FId = SourceFileNames.size() + 1; 1624 SourceFileIdMap[FileName] = FId; 1625 SourceFileNames.push_back(FileName); 1626 } 1627 1628 DenseMap<std::pair<unsigned, unsigned>, unsigned>::iterator SI = 1629 SourceIdMap.find(std::make_pair(DId, FId)); 1630 if (SI != SourceIdMap.end()) 1631 return SI->second; 1632 1633 unsigned SrcId = SourceIds.size() + 1; // DW_AT_decl_file cannot be 0. 1634 SourceIdMap[std::make_pair(DId, FId)] = SrcId; 1635 SourceIds.push_back(std::make_pair(DId, FId)); 1636 1637 return SrcId; 1638} 1639 1640/// getOrCreateNameSpace - Create a DIE for DINameSpace. 1641DIE *DwarfDebug::getOrCreateNameSpace(DINameSpace NS) { 1642 DIE *NDie = ModuleCU->getDIE(NS.getNode()); 1643 if (NDie) 1644 return NDie; 1645 NDie = new DIE(dwarf::DW_TAG_namespace); 1646 ModuleCU->insertDIE(NS.getNode(), NDie); 1647 if (!NS.getName().empty()) 1648 addString(NDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, NS.getName()); 1649 addSourceLine(NDie, &NS); 1650 addToContextOwner(NDie, NS.getContext()); 1651 return NDie; 1652} 1653 1654void DwarfDebug::constructCompileUnit(MDNode *N) { 1655 DICompileUnit DIUnit(N); 1656 // Use first compile unit marked as isMain as the compile unit for this 1657 // module. 1658 if (ModuleCU || !DIUnit.isMain()) 1659 return; 1660 StringRef FN = DIUnit.getFilename(); 1661 StringRef Dir = DIUnit.getDirectory(); 1662 unsigned ID = GetOrCreateSourceID(Dir, FN); 1663 1664 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit); 1665 addString(Die, dwarf::DW_AT_producer, dwarf::DW_FORM_string, 1666 DIUnit.getProducer()); 1667 addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data1, 1668 DIUnit.getLanguage()); 1669 addString(Die, dwarf::DW_AT_name, dwarf::DW_FORM_string, FN); 1670 addLabel(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, 1671 getTempLabel("text_begin")); 1672 addLabel(Die, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr, 1673 getTempLabel("text_end")); 1674 // DW_AT_stmt_list is a offset of line number information for this 1675 // compile unit in debug_line section. It is always zero when only one 1676 // compile unit is emitted in one object file. 1677 addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0); 1678 1679 if (!Dir.empty()) 1680 addString(Die, dwarf::DW_AT_comp_dir, dwarf::DW_FORM_string, Dir); 1681 if (DIUnit.isOptimized()) 1682 addUInt(Die, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1); 1683 1684 StringRef Flags = DIUnit.getFlags(); 1685 if (!Flags.empty()) 1686 addString(Die, dwarf::DW_AT_APPLE_flags, dwarf::DW_FORM_string, Flags); 1687 1688 unsigned RVer = DIUnit.getRunTimeVersion(); 1689 if (RVer) 1690 addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers, 1691 dwarf::DW_FORM_data1, RVer); 1692 1693 assert(!ModuleCU && 1694 "ModuleCU assigned since the top of constructCompileUnit"); 1695 ModuleCU = new CompileUnit(ID, Die); 1696} 1697 1698void DwarfDebug::constructGlobalVariableDIE(MDNode *N) { 1699 DIGlobalVariable DI_GV(N); 1700 1701 // If debug information is malformed then ignore it. 1702 if (DI_GV.Verify() == false) 1703 return; 1704 1705 // Check for pre-existence. 1706 if (ModuleCU->getDIE(DI_GV.getNode())) 1707 return; 1708 1709 DIE *VariableDie = createGlobalVariableDIE(DI_GV); 1710 if (!VariableDie) 1711 return; 1712 1713 // Add to map. 1714 ModuleCU->insertDIE(N, VariableDie); 1715 1716 // Add to context owner. 1717 DIDescriptor GVContext = DI_GV.getContext(); 1718 // Do not create specification DIE if context is either compile unit 1719 // or a subprogram. 1720 if (DI_GV.isDefinition() && !GVContext.isCompileUnit() && 1721 !GVContext.isFile() && !GVContext.isSubprogram()) { 1722 // Create specification DIE. 1723 DIE *VariableSpecDIE = new DIE(dwarf::DW_TAG_variable); 1724 addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification, 1725 dwarf::DW_FORM_ref4, VariableDie); 1726 DIEBlock *Block = new (DIEValueAllocator) DIEBlock(); 1727 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr); 1728 addLabel(Block, 0, dwarf::DW_FORM_udata, 1729 Asm->Mang->getSymbol(DI_GV.getGlobal())); 1730 addBlock(VariableSpecDIE, dwarf::DW_AT_location, 0, Block); 1731 addUInt(VariableDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1); 1732 ModuleCU->addDie(VariableSpecDIE); 1733 } else { 1734 DIEBlock *Block = new (DIEValueAllocator) DIEBlock(); 1735 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr); 1736 addLabel(Block, 0, dwarf::DW_FORM_udata, 1737 Asm->Mang->getSymbol(DI_GV.getGlobal())); 1738 addBlock(VariableDie, dwarf::DW_AT_location, 0, Block); 1739 } 1740 addToContextOwner(VariableDie, GVContext); 1741 1742 // Expose as global. FIXME - need to check external flag. 1743 ModuleCU->addGlobal(DI_GV.getName(), VariableDie); 1744 1745 DIType GTy = DI_GV.getType(); 1746 if (GTy.isCompositeType() && !GTy.getName().empty()) { 1747 DIEEntry *Entry = ModuleCU->getDIEEntry(GTy.getNode()); 1748 assert(Entry && "Missing global type!"); 1749 ModuleCU->addGlobalType(GTy.getName(), Entry->getEntry()); 1750 } 1751 return; 1752} 1753 1754void DwarfDebug::constructSubprogramDIE(MDNode *N) { 1755 DISubprogram SP(N); 1756 1757 // Check for pre-existence. 1758 if (ModuleCU->getDIE(N)) 1759 return; 1760 1761 if (!SP.isDefinition()) 1762 // This is a method declaration which will be handled while constructing 1763 // class type. 1764 return; 1765 1766 DIE *SubprogramDie = createSubprogramDIE(SP); 1767 1768 // Add to map. 1769 ModuleCU->insertDIE(N, SubprogramDie); 1770 1771 // Add to context owner. 1772 addToContextOwner(SubprogramDie, SP.getContext()); 1773 1774 // Expose as global. 1775 ModuleCU->addGlobal(SP.getName(), SubprogramDie); 1776 1777 return; 1778} 1779 1780/// beginModule - Emit all Dwarf sections that should come prior to the 1781/// content. Create global DIEs and emit initial debug info sections. 1782/// This is inovked by the target AsmPrinter. 1783void DwarfDebug::beginModule(Module *M, MachineModuleInfo *mmi) { 1784 this->M = M; 1785 1786 if (!MAI->doesSupportDebugInformation()) 1787 return; 1788 1789 TimeRegion Timer(DebugTimer); 1790 1791 DebugInfoFinder DbgFinder; 1792 DbgFinder.processModule(*M); 1793 1794 // Create all the compile unit DIEs. 1795 for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(), 1796 E = DbgFinder.compile_unit_end(); I != E; ++I) 1797 constructCompileUnit(*I); 1798 1799 if (!ModuleCU) 1800 return; 1801 1802 // Create DIEs for each subprogram. 1803 for (DebugInfoFinder::iterator I = DbgFinder.subprogram_begin(), 1804 E = DbgFinder.subprogram_end(); I != E; ++I) 1805 constructSubprogramDIE(*I); 1806 1807 // Create DIEs for each global variable. 1808 for (DebugInfoFinder::iterator I = DbgFinder.global_variable_begin(), 1809 E = DbgFinder.global_variable_end(); I != E; ++I) 1810 constructGlobalVariableDIE(*I); 1811 1812 MMI = mmi; 1813 shouldEmit = true; 1814 MMI->setDebugInfoAvailability(true); 1815 1816 // Prime section data. 1817 SectionMap.insert(Asm->getObjFileLowering().getTextSection()); 1818 1819 // Print out .file directives to specify files for .loc directives. These are 1820 // printed out early so that they precede any .loc directives. 1821 if (MAI->hasDotLocAndDotFile()) { 1822 for (unsigned i = 1, e = getNumSourceIds()+1; i != e; ++i) { 1823 // Remember source id starts at 1. 1824 std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(i); 1825 // FIXME: don't use sys::path for this! This should not depend on the 1826 // host. 1827 sys::Path FullPath(getSourceDirectoryName(Id.first)); 1828 bool AppendOk = 1829 FullPath.appendComponent(getSourceFileName(Id.second)); 1830 assert(AppendOk && "Could not append filename to directory!"); 1831 AppendOk = false; 1832 Asm->OutStreamer.EmitDwarfFileDirective(i, FullPath.str()); 1833 } 1834 } 1835 1836 // Emit initial sections 1837 emitInitial(); 1838} 1839 1840/// endModule - Emit all Dwarf sections that should come after the content. 1841/// 1842void DwarfDebug::endModule() { 1843 if (!ModuleCU) 1844 return; 1845 1846 TimeRegion Timer(DebugTimer); 1847 1848 // Attach DW_AT_inline attribute with inlined subprogram DIEs. 1849 for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(), 1850 AE = InlinedSubprogramDIEs.end(); AI != AE; ++AI) { 1851 DIE *ISP = *AI; 1852 addUInt(ISP, dwarf::DW_AT_inline, 0, dwarf::DW_INL_inlined); 1853 } 1854 1855 // Insert top level DIEs. 1856 for (SmallVector<DIE *, 4>::iterator TI = TopLevelDIEsVector.begin(), 1857 TE = TopLevelDIEsVector.end(); TI != TE; ++TI) 1858 ModuleCU->getCUDie()->addChild(*TI); 1859 1860 for (DenseMap<DIE *, MDNode *>::iterator CI = ContainingTypeMap.begin(), 1861 CE = ContainingTypeMap.end(); CI != CE; ++CI) { 1862 DIE *SPDie = CI->first; 1863 MDNode *N = dyn_cast_or_null<MDNode>(CI->second); 1864 if (!N) continue; 1865 DIE *NDie = ModuleCU->getDIE(N); 1866 if (!NDie) continue; 1867 addDIEEntry(SPDie, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4, NDie); 1868 // FIXME - This is not the correct approach. 1869 //addDIEEntry(NDie, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4, NDie 1870 } 1871 1872 // Standard sections final addresses. 1873 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getTextSection()); 1874 Asm->OutStreamer.EmitLabel(getTempLabel("text_end")); 1875 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getDataSection()); 1876 Asm->OutStreamer.EmitLabel(getTempLabel("data_end")); 1877 1878 // End text sections. 1879 for (unsigned i = 1, N = SectionMap.size(); i <= N; ++i) { 1880 Asm->OutStreamer.SwitchSection(SectionMap[i]); 1881 Asm->OutStreamer.EmitLabel(getDWLabel("section_end", i)); 1882 } 1883 1884 // Emit common frame information. 1885 emitCommonDebugFrame(); 1886 1887 // Emit function debug frame information 1888 for (std::vector<FunctionDebugFrameInfo>::iterator I = DebugFrames.begin(), 1889 E = DebugFrames.end(); I != E; ++I) 1890 emitFunctionDebugFrame(*I); 1891 1892 // Compute DIE offsets and sizes. 1893 computeSizeAndOffsets(); 1894 1895 // Emit all the DIEs into a debug info section 1896 emitDebugInfo(); 1897 1898 // Corresponding abbreviations into a abbrev section. 1899 emitAbbreviations(); 1900 1901 // Emit source line correspondence into a debug line section. 1902 emitDebugLines(); 1903 1904 // Emit info into a debug pubnames section. 1905 emitDebugPubNames(); 1906 1907 // Emit info into a debug pubtypes section. 1908 emitDebugPubTypes(); 1909 1910 // Emit info into a debug loc section. 1911 emitDebugLoc(); 1912 1913 // Emit info into a debug aranges section. 1914 EmitDebugARanges(); 1915 1916 // Emit info into a debug ranges section. 1917 emitDebugRanges(); 1918 1919 // Emit info into a debug macinfo section. 1920 emitDebugMacInfo(); 1921 1922 // Emit inline info. 1923 emitDebugInlineInfo(); 1924 1925 // Emit info into a debug str section. 1926 emitDebugStr(); 1927 1928 delete ModuleCU; 1929 ModuleCU = NULL; // Reset for the next Module, if any. 1930} 1931 1932/// findAbstractVariable - Find abstract variable, if any, associated with Var. 1933DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &Var, 1934 unsigned FrameIdx, 1935 DILocation &ScopeLoc) { 1936 1937 DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var.getNode()); 1938 if (AbsDbgVariable) 1939 return AbsDbgVariable; 1940 1941 DbgScope *Scope = AbstractScopes.lookup(ScopeLoc.getScope().getNode()); 1942 if (!Scope) 1943 return NULL; 1944 1945 AbsDbgVariable = new DbgVariable(Var, FrameIdx, 1946 NULL /* No more-abstract variable*/); 1947 Scope->addVariable(AbsDbgVariable); 1948 AbstractVariables[Var.getNode()] = AbsDbgVariable; 1949 return AbsDbgVariable; 1950} 1951 1952/// findAbstractVariable - Find abstract variable, if any, associated with Var. 1953/// FIXME : Refactor findAbstractVariable. 1954DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &Var, 1955 const MachineInstr *MI, 1956 DILocation &ScopeLoc) { 1957 1958 DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var.getNode()); 1959 if (AbsDbgVariable) 1960 return AbsDbgVariable; 1961 1962 DbgScope *Scope = AbstractScopes.lookup(ScopeLoc.getScope().getNode()); 1963 if (!Scope) 1964 return NULL; 1965 1966 AbsDbgVariable = new DbgVariable(Var, MI, 1967 NULL /* No more-abstract variable*/); 1968 Scope->addVariable(AbsDbgVariable); 1969 AbstractVariables[Var.getNode()] = AbsDbgVariable; 1970 DbgValueStartMap[MI] = AbsDbgVariable; 1971 return AbsDbgVariable; 1972} 1973 1974/// collectVariableInfo - Populate DbgScope entries with variables' info. 1975void DwarfDebug::collectVariableInfo() { 1976 if (!MMI) return; 1977 1978 MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo(); 1979 for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(), 1980 VE = VMap.end(); VI != VE; ++VI) { 1981 MDNode *Var = VI->first; 1982 if (!Var) continue; 1983 DIVariable DV (Var); 1984 std::pair< unsigned, MDNode *> VP = VI->second; 1985 DILocation ScopeLoc(VP.second); 1986 1987 DbgScope *Scope = 1988 ConcreteScopes.lookup(ScopeLoc.getOrigLocation().getNode()); 1989 if (!Scope) 1990 Scope = DbgScopeMap.lookup(ScopeLoc.getScope().getNode()); 1991 // If variable scope is not found then skip this variable. 1992 if (!Scope) 1993 continue; 1994 1995 DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.first, ScopeLoc); 1996 DbgVariable *RegVar = new DbgVariable(DV, VP.first, AbsDbgVariable); 1997 Scope->addVariable(RegVar); 1998 } 1999 2000 // Collect variable information from DBG_VALUE machine instructions; 2001 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); 2002 I != E; ++I) { 2003 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end(); 2004 II != IE; ++II) { 2005 const MachineInstr *MInsn = II; 2006 if (!MInsn->isDebugValue()) 2007 continue; 2008 2009 // FIXME : Lift this restriction. 2010 if (MInsn->getNumOperands() != 3) 2011 continue; 2012 DIVariable DV((MDNode*)(MInsn->getOperand(MInsn->getNumOperands() 2013 - 1).getMetadata())); 2014 if (DV.getTag() == dwarf::DW_TAG_arg_variable) { 2015 // FIXME Handle inlined subroutine arguments. 2016 DbgVariable *ArgVar = new DbgVariable(DV, MInsn, NULL); 2017 CurrentFnDbgScope->addVariable(ArgVar); 2018 DbgValueStartMap[MInsn] = ArgVar; 2019 continue; 2020 } 2021 2022 DebugLoc DL = MInsn->getDebugLoc(); 2023 if (DL.isUnknown()) continue; 2024 DILocation ScopeLoc = MF->getDILocation(DL); 2025 DbgScope *Scope = 2026 ConcreteScopes.lookup(ScopeLoc.getOrigLocation().getNode()); 2027 if (!Scope) 2028 Scope = DbgScopeMap.lookup(ScopeLoc.getScope().getNode()); 2029 // If variable scope is not found then skip this variable. 2030 if (!Scope) 2031 continue; 2032 2033 DbgVariable *AbsDbgVariable = findAbstractVariable(DV, MInsn, ScopeLoc); 2034 DbgVariable *RegVar = new DbgVariable(DV, MInsn, AbsDbgVariable); 2035 DbgValueStartMap[MInsn] = RegVar; 2036 Scope->addVariable(RegVar); 2037 } 2038 } 2039} 2040 2041/// beginScope - Process beginning of a scope. 2042void DwarfDebug::beginScope(const MachineInstr *MI) { 2043 // Check location. 2044 DebugLoc DL = MI->getDebugLoc(); 2045 if (DL.isUnknown()) 2046 return; 2047 DILocation DILoc = MF->getDILocation(DL); 2048 if (!DILoc.getScope().Verify()) 2049 return; 2050 2051 // Check and update last known location info. 2052 if(DILoc.getNode() == PrevDILoc) 2053 return; 2054 2055 // DBG_VALUE instruction establishes new value. 2056 if (MI->isDebugValue()) { 2057 DenseMap<const MachineInstr *, DbgVariable *>::iterator DI 2058 = DbgValueStartMap.find(MI); 2059 if (DI != DbgValueStartMap.end()) { 2060 MCSymbol *Label = recordSourceLine(DILoc.getLineNumber(), 2061 DILoc.getColumnNumber(), 2062 DILoc.getScope().getNode()); 2063 PrevDILoc = DILoc.getNode(); 2064 DI->second->setDbgValueLabel(Label); 2065 } 2066 return; 2067 } 2068 2069 // Emit a label to indicate location change. This is used for line 2070 // table even if this instruction does start a new scope. 2071 MCSymbol *Label = recordSourceLine(DILoc.getLineNumber(), 2072 DILoc.getColumnNumber(), 2073 DILoc.getScope().getNode()); 2074 PrevDILoc = DILoc.getNode(); 2075 2076 // update DbgScope if this instruction starts a new scope. 2077 InsnToDbgScopeMapTy::iterator I = DbgScopeBeginMap.find(MI); 2078 if (I == DbgScopeBeginMap.end()) 2079 return; 2080 2081 ScopeVector &SD = I->second; 2082 for (ScopeVector::iterator SDI = SD.begin(), SDE = SD.end(); 2083 SDI != SDE; ++SDI) 2084 (*SDI)->setStartLabel(Label); 2085} 2086 2087/// endScope - Process end of a scope. 2088void DwarfDebug::endScope(const MachineInstr *MI) { 2089 // Ignore DBG_VALUE instruction. 2090 if (MI->isDebugValue()) 2091 return; 2092 2093 // Check location. 2094 DebugLoc DL = MI->getDebugLoc(); 2095 if (DL.isUnknown()) 2096 return; 2097 DILocation DILoc = MF->getDILocation(DL); 2098 if (!DILoc.getScope().Verify()) 2099 return; 2100 2101 // Emit a label and update DbgScope if this instruction ends a scope. 2102 InsnToDbgScopeMapTy::iterator I = DbgScopeEndMap.find(MI); 2103 if (I == DbgScopeEndMap.end()) 2104 return; 2105 2106 MCSymbol *Label = MMI->getContext().CreateTempSymbol(); 2107 Asm->OutStreamer.EmitLabel(Label); 2108 2109 SmallVector<DbgScope*, 2> &SD = I->second; 2110 for (SmallVector<DbgScope *, 2>::iterator SDI = SD.begin(), SDE = SD.end(); 2111 SDI != SDE; ++SDI) 2112 (*SDI)->setEndLabel(Label); 2113 return; 2114} 2115 2116/// createDbgScope - Create DbgScope for the scope. 2117void DwarfDebug::createDbgScope(MDNode *Scope, MDNode *InlinedAt) { 2118 2119 if (!InlinedAt) { 2120 DbgScope *WScope = DbgScopeMap.lookup(Scope); 2121 if (WScope) 2122 return; 2123 WScope = new DbgScope(NULL, DIDescriptor(Scope), NULL); 2124 DbgScopeMap.insert(std::make_pair(Scope, WScope)); 2125 if (DIDescriptor(Scope).isLexicalBlock()) 2126 createDbgScope(DILexicalBlock(Scope).getContext().getNode(), NULL); 2127 return; 2128 } 2129 2130 DbgScope *WScope = DbgScopeMap.lookup(InlinedAt); 2131 if (WScope) 2132 return; 2133 2134 WScope = new DbgScope(NULL, DIDescriptor(Scope), InlinedAt); 2135 DbgScopeMap.insert(std::make_pair(InlinedAt, WScope)); 2136 DILocation DL(InlinedAt); 2137 createDbgScope(DL.getScope().getNode(), DL.getOrigLocation().getNode()); 2138} 2139 2140/// extractScopeInformation - Scan machine instructions in this function 2141/// and collect DbgScopes. Return true, if at least one scope was found. 2142bool DwarfDebug::extractScopeInformation() { 2143 // If scope information was extracted using .dbg intrinsics then there is not 2144 // any need to extract these information by scanning each instruction. 2145 if (!DbgScopeMap.empty()) 2146 return false; 2147 2148 DenseMap<const MachineInstr *, unsigned> MIIndexMap; 2149 unsigned MIIndex = 0; 2150 MDNode *PrevScope = NULL; 2151 MDNode *PrevInlinedAt = NULL; 2152 // Scan each instruction and create scopes. First build working set of scopes. 2153 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); 2154 I != E; ++I) { 2155 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end(); 2156 II != IE; ++II) { 2157 const MachineInstr *MInsn = II; 2158 // FIXME : Remove DBG_VALUE check. 2159 if (MInsn->isDebugValue()) continue; 2160 MIIndexMap[MInsn] = MIIndex++; 2161 DebugLoc DL = MInsn->getDebugLoc(); 2162 if (DL.isUnknown()) continue; 2163 DILocation DLT = MF->getDILocation(DL); 2164 DIScope DLTScope = DLT.getScope(); 2165 MDNode *NewScope = DLTScope.getNode(); 2166 if (!NewScope) continue; 2167 // There is no need to create another DIE for compile unit. For all 2168 // other scopes, create one DbgScope now. This will be translated 2169 // into a scope DIE at the end. 2170 if (DLTScope.isCompileUnit()) continue; 2171 MDNode *NewInlinedAt = DLT.getOrigLocation().getNode(); 2172 if (NewScope == PrevScope && NewInlinedAt == PrevInlinedAt) continue; 2173 createDbgScope(NewScope, NewInlinedAt); 2174 PrevScope = NewScope; 2175 PrevInlinedAt = NewInlinedAt; 2176 } 2177 } 2178 2179 // Build scope hierarchy using working set of scopes. 2180 PrevScope = NULL; 2181 PrevInlinedAt = NULL; 2182 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); 2183 I != E; ++I) { 2184 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end(); 2185 II != IE; ++II) { 2186 const MachineInstr *MInsn = II; 2187 // FIXME : Remove DBG_VALUE check. 2188 if (MInsn->isDebugValue()) continue; 2189 DebugLoc DL = MInsn->getDebugLoc(); 2190 if (DL.isUnknown()) continue; 2191 DILocation DLT = MF->getDILocation(DL); 2192 DIScope DLTScope = DLT.getScope(); 2193 MDNode *NewScope = DLTScope.getNode(); 2194 if (!NewScope) continue; 2195 // There is no need to create another DIE for compile unit. For all 2196 // other scopes, create one DbgScope now. This will be translated 2197 // into a scope DIE at the end. 2198 if (DLTScope.isCompileUnit()) continue; 2199 MDNode *NewInlinedAt = DLT.getOrigLocation().getNode(); 2200 if (NewScope == PrevScope && NewInlinedAt == PrevInlinedAt) continue; 2201 DbgScope *Scope = getUpdatedDbgScope(NewScope, MInsn, NewInlinedAt); 2202 Scope->setLastInsn(MInsn); 2203 PrevScope = NewScope; 2204 PrevInlinedAt = NewInlinedAt; 2205 } 2206 } 2207 2208 if (!CurrentFnDbgScope) 2209 return false; 2210 2211 CurrentFnDbgScope->fixInstructionMarkers(MIIndexMap); 2212 2213 // Each scope has first instruction and last instruction to mark beginning 2214 // and end of a scope respectively. Create an inverse map that list scopes 2215 // starts (and ends) with an instruction. One instruction may start (or end) 2216 // multiple scopes. Ignore scopes that are not reachable. 2217 SmallVector<DbgScope *, 4> WorkList; 2218 WorkList.push_back(CurrentFnDbgScope); 2219 while (!WorkList.empty()) { 2220 DbgScope *S = WorkList.pop_back_val(); 2221 2222 const SmallVector<DbgScope *, 4> &Children = S->getScopes(); 2223 if (!Children.empty()) 2224 for (SmallVector<DbgScope *, 4>::const_iterator SI = Children.begin(), 2225 SE = Children.end(); SI != SE; ++SI) 2226 WorkList.push_back(*SI); 2227 2228 if (S->isAbstractScope()) 2229 continue; 2230 const MachineInstr *MI = S->getFirstInsn(); 2231 assert(MI && "DbgScope does not have first instruction!"); 2232 2233 InsnToDbgScopeMapTy::iterator IDI = DbgScopeBeginMap.find(MI); 2234 if (IDI != DbgScopeBeginMap.end()) 2235 IDI->second.push_back(S); 2236 else 2237 DbgScopeBeginMap[MI].push_back(S); 2238 2239 MI = S->getLastInsn(); 2240 assert(MI && "DbgScope does not have last instruction!"); 2241 IDI = DbgScopeEndMap.find(MI); 2242 if (IDI != DbgScopeEndMap.end()) 2243 IDI->second.push_back(S); 2244 else 2245 DbgScopeEndMap[MI].push_back(S); 2246 } 2247 2248 return !DbgScopeMap.empty(); 2249} 2250 2251/// beginFunction - Gather pre-function debug information. Assumes being 2252/// emitted immediately after the function entry point. 2253void DwarfDebug::beginFunction(const MachineFunction *MF) { 2254 this->MF = MF; 2255 2256 if (!ShouldEmitDwarfDebug()) return; 2257 if (!extractScopeInformation()) 2258 return; 2259 2260 TimeRegion Timer(DebugTimer); 2261 2262 collectVariableInfo(); 2263 2264 // Assumes in correct section after the entry point. 2265 Asm->OutStreamer.EmitLabel(getDWLabel("func_begin", ++SubprogramCount)); 2266 2267 // Emit label for the implicitly defined dbg.stoppoint at the start of the 2268 // function. 2269 DebugLoc FDL = MF->getDefaultDebugLoc(); 2270 if (!FDL.isUnknown()) { 2271 DILocation DLT = MF->getDILocation(FDL); 2272 DISubprogram SP = getDISubprogram(DLT.getScope().getNode()); 2273 unsigned Line, Col; 2274 if (SP.Verify()) { 2275 Line = SP.getLineNumber(); 2276 Col = 0; 2277 } else { 2278 Line = DLT.getLineNumber(); 2279 Col = DLT.getColumnNumber(); 2280 } 2281 2282 recordSourceLine(Line, Col, DLT.getScope().getNode()); 2283 } 2284} 2285 2286/// endFunction - Gather and emit post-function debug information. 2287/// 2288void DwarfDebug::endFunction(const MachineFunction *MF) { 2289 if (!ShouldEmitDwarfDebug()) return; 2290 if (DbgScopeMap.empty()) return; 2291 2292 TimeRegion Timer(DebugTimer); 2293 2294 if (CurrentFnDbgScope) { 2295 // Define end label for subprogram. 2296 Asm->OutStreamer.EmitLabel(getDWLabel("func_end", SubprogramCount)); 2297 2298 // Get function line info. 2299 if (!Lines.empty()) { 2300 // Get section line info. 2301 unsigned ID = SectionMap.insert(Asm->getCurrentSection()); 2302 if (SectionSourceLines.size() < ID) SectionSourceLines.resize(ID); 2303 std::vector<SrcLineInfo> &SectionLineInfos = SectionSourceLines[ID-1]; 2304 // Append the function info to section info. 2305 SectionLineInfos.insert(SectionLineInfos.end(), 2306 Lines.begin(), Lines.end()); 2307 } 2308 2309 // Construct abstract scopes. 2310 for (SmallVector<DbgScope *, 4>::iterator AI = AbstractScopesList.begin(), 2311 AE = AbstractScopesList.end(); AI != AE; ++AI) 2312 constructScopeDIE(*AI); 2313 2314 constructScopeDIE(CurrentFnDbgScope); 2315 2316 DebugFrames.push_back(FunctionDebugFrameInfo(SubprogramCount, 2317 MMI->getFrameMoves())); 2318 } 2319 2320 // Clear debug info 2321 CurrentFnDbgScope = NULL; 2322 DeleteContainerSeconds(DbgScopeMap); 2323 DbgScopeBeginMap.clear(); 2324 DbgScopeEndMap.clear(); 2325 DbgValueStartMap.clear(); 2326 ConcreteScopes.clear(); 2327 DeleteContainerSeconds(AbstractScopes); 2328 AbstractScopesList.clear(); 2329 AbstractVariables.clear(); 2330 Lines.clear(); 2331} 2332 2333/// recordSourceLine - Register a source line with debug info. Returns the 2334/// unique label that was emitted and which provides correspondence to 2335/// the source line list. 2336MCSymbol *DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, MDNode *S) { 2337 if (!MMI) 2338 return 0; 2339 2340 TimeRegion Timer(DebugTimer); 2341 2342 StringRef Dir; 2343 StringRef Fn; 2344 2345 DIDescriptor Scope(S); 2346 if (Scope.isCompileUnit()) { 2347 DICompileUnit CU(S); 2348 Dir = CU.getDirectory(); 2349 Fn = CU.getFilename(); 2350 } else if (Scope.isSubprogram()) { 2351 DISubprogram SP(S); 2352 Dir = SP.getDirectory(); 2353 Fn = SP.getFilename(); 2354 } else if (Scope.isLexicalBlock()) { 2355 DILexicalBlock DB(S); 2356 Dir = DB.getDirectory(); 2357 Fn = DB.getFilename(); 2358 } else 2359 assert(0 && "Unexpected scope info"); 2360 2361 unsigned Src = GetOrCreateSourceID(Dir, Fn); 2362 MCSymbol *Label = MMI->getContext().CreateTempSymbol(); 2363 Lines.push_back(SrcLineInfo(Line, Col, Src, Label)); 2364 2365 Asm->OutStreamer.EmitLabel(Label); 2366 return Label; 2367} 2368 2369/// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be 2370/// timed. Look up the source id with the given directory and source file 2371/// names. If none currently exists, create a new id and insert it in the 2372/// SourceIds map. This can update DirectoryNames and SourceFileNames maps as 2373/// well. 2374unsigned DwarfDebug::getOrCreateSourceID(const std::string &DirName, 2375 const std::string &FileName) { 2376 TimeRegion Timer(DebugTimer); 2377 return GetOrCreateSourceID(DirName.c_str(), FileName.c_str()); 2378} 2379 2380//===----------------------------------------------------------------------===// 2381// Emit Methods 2382//===----------------------------------------------------------------------===// 2383 2384/// computeSizeAndOffset - Compute the size and offset of a DIE. 2385/// 2386unsigned 2387DwarfDebug::computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last) { 2388 // Get the children. 2389 const std::vector<DIE *> &Children = Die->getChildren(); 2390 2391 // If not last sibling and has children then add sibling offset attribute. 2392 if (!Last && !Children.empty()) 2393 Die->addSiblingOffset(DIEValueAllocator); 2394 2395 // Record the abbreviation. 2396 assignAbbrevNumber(Die->getAbbrev()); 2397 2398 // Get the abbreviation for this DIE. 2399 unsigned AbbrevNumber = Die->getAbbrevNumber(); 2400 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1]; 2401 2402 // Set DIE offset 2403 Die->setOffset(Offset); 2404 2405 // Start the size with the size of abbreviation code. 2406 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber); 2407 2408 const SmallVector<DIEValue*, 32> &Values = Die->getValues(); 2409 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData(); 2410 2411 // Size the DIE attribute values. 2412 for (unsigned i = 0, N = Values.size(); i < N; ++i) 2413 // Size attribute value. 2414 Offset += Values[i]->SizeOf(TD, AbbrevData[i].getForm()); 2415 2416 // Size the DIE children if any. 2417 if (!Children.empty()) { 2418 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes && 2419 "Children flag not set"); 2420 2421 for (unsigned j = 0, M = Children.size(); j < M; ++j) 2422 Offset = computeSizeAndOffset(Children[j], Offset, (j + 1) == M); 2423 2424 // End of children marker. 2425 Offset += sizeof(int8_t); 2426 } 2427 2428 Die->setSize(Offset - Die->getOffset()); 2429 return Offset; 2430} 2431 2432/// computeSizeAndOffsets - Compute the size and offset of all the DIEs. 2433/// 2434void DwarfDebug::computeSizeAndOffsets() { 2435 // Compute size of compile unit header. 2436 static unsigned Offset = 2437 sizeof(int32_t) + // Length of Compilation Unit Info 2438 sizeof(int16_t) + // DWARF version number 2439 sizeof(int32_t) + // Offset Into Abbrev. Section 2440 sizeof(int8_t); // Pointer Size (in bytes) 2441 2442 computeSizeAndOffset(ModuleCU->getCUDie(), Offset, true); 2443 CompileUnitOffsets[ModuleCU] = 0; 2444} 2445 2446/// emitInitial - Emit initial Dwarf declarations. This is necessary for cc 2447/// tools to recognize the object file contains Dwarf information. 2448void DwarfDebug::emitInitial() { 2449 // Check to see if we already emitted intial headers. 2450 if (didInitial) return; 2451 didInitial = true; 2452 2453 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering(); 2454 2455 // Dwarf sections base addresses. 2456 if (MAI->doesDwarfRequireFrameSection()) { 2457 Asm->OutStreamer.SwitchSection(TLOF.getDwarfFrameSection()); 2458 Asm->OutStreamer.EmitLabel(getTempLabel("section_debug_frame")); 2459 } 2460 2461 Asm->OutStreamer.SwitchSection(TLOF.getDwarfInfoSection()); 2462 Asm->OutStreamer.EmitLabel(getTempLabel("section_info")); 2463 Asm->OutStreamer.SwitchSection(TLOF.getDwarfAbbrevSection()); 2464 Asm->OutStreamer.EmitLabel(getTempLabel("section_abbrev")); 2465 Asm->OutStreamer.SwitchSection(TLOF.getDwarfARangesSection()); 2466 Asm->OutStreamer.EmitLabel(getTempLabel("section_aranges")); 2467 2468 if (const MCSection *LineInfoDirective = TLOF.getDwarfMacroInfoSection()) { 2469 Asm->OutStreamer.SwitchSection(LineInfoDirective); 2470 Asm->OutStreamer.EmitLabel(getTempLabel("section_macinfo")); 2471 } 2472 2473 Asm->OutStreamer.SwitchSection(TLOF.getDwarfLineSection()); 2474 Asm->OutStreamer.EmitLabel(getTempLabel("section_line")); 2475 Asm->OutStreamer.SwitchSection(TLOF.getDwarfLocSection()); 2476 Asm->OutStreamer.EmitLabel(getTempLabel("section_loc")); 2477 Asm->OutStreamer.SwitchSection(TLOF.getDwarfPubNamesSection()); 2478 Asm->OutStreamer.EmitLabel(getTempLabel("section_pubnames")); 2479 Asm->OutStreamer.SwitchSection(TLOF.getDwarfPubTypesSection()); 2480 Asm->OutStreamer.EmitLabel(getTempLabel("section_pubtypes")); 2481 Asm->OutStreamer.SwitchSection(TLOF.getDwarfStrSection()); 2482 Asm->OutStreamer.EmitLabel(getTempLabel("section_str")); 2483 Asm->OutStreamer.SwitchSection(TLOF.getDwarfRangesSection()); 2484 Asm->OutStreamer.EmitLabel(getTempLabel("section_ranges")); 2485 2486 Asm->OutStreamer.SwitchSection(TLOF.getTextSection()); 2487 Asm->OutStreamer.EmitLabel(getTempLabel("text_begin")); 2488 Asm->OutStreamer.SwitchSection(TLOF.getDataSection()); 2489 Asm->OutStreamer.EmitLabel(getTempLabel("data_begin")); 2490} 2491 2492/// emitDIE - Recusively Emits a debug information entry. 2493/// 2494void DwarfDebug::emitDIE(DIE *Die) { 2495 // Get the abbreviation for this DIE. 2496 unsigned AbbrevNumber = Die->getAbbrevNumber(); 2497 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1]; 2498 2499 // Emit the code (index) for the abbreviation. 2500 if (Asm->VerboseAsm) 2501 Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" + 2502 Twine::utohexstr(Die->getOffset()) + ":0x" + 2503 Twine::utohexstr(Die->getSize()) + " " + 2504 dwarf::TagString(Abbrev->getTag())); 2505 EmitULEB128(AbbrevNumber); 2506 2507 const SmallVector<DIEValue*, 32> &Values = Die->getValues(); 2508 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData(); 2509 2510 // Emit the DIE attribute values. 2511 for (unsigned i = 0, N = Values.size(); i < N; ++i) { 2512 unsigned Attr = AbbrevData[i].getAttribute(); 2513 unsigned Form = AbbrevData[i].getForm(); 2514 assert(Form && "Too many attributes for DIE (check abbreviation)"); 2515 2516 if (Asm->VerboseAsm) 2517 Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr)); 2518 2519 switch (Attr) { 2520 case dwarf::DW_AT_sibling: 2521 Asm->EmitInt32(Die->getSiblingOffset()); 2522 break; 2523 case dwarf::DW_AT_abstract_origin: { 2524 DIEEntry *E = cast<DIEEntry>(Values[i]); 2525 DIE *Origin = E->getEntry(); 2526 unsigned Addr = Origin->getOffset(); 2527 Asm->EmitInt32(Addr); 2528 break; 2529 } 2530 default: 2531 // Emit an attribute using the defined form. 2532 Values[i]->EmitValue(this, Form); 2533 break; 2534 } 2535 } 2536 2537 // Emit the DIE children if any. 2538 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) { 2539 const std::vector<DIE *> &Children = Die->getChildren(); 2540 2541 for (unsigned j = 0, M = Children.size(); j < M; ++j) 2542 emitDIE(Children[j]); 2543 2544 if (Asm->VerboseAsm) 2545 Asm->OutStreamer.AddComment("End Of Children Mark"); 2546 Asm->EmitInt8(0); 2547 } 2548} 2549 2550/// emitDebugInfo - Emit the debug info section. 2551/// 2552void DwarfDebug::emitDebugInfo() { 2553 // Start debug info section. 2554 Asm->OutStreamer.SwitchSection( 2555 Asm->getObjFileLowering().getDwarfInfoSection()); 2556 DIE *Die = ModuleCU->getCUDie(); 2557 2558 // Emit the compile units header. 2559 Asm->OutStreamer.EmitLabel(getDWLabel("info_begin", ModuleCU->getID())); 2560 2561 // Emit size of content not including length itself 2562 unsigned ContentSize = Die->getSize() + 2563 sizeof(int16_t) + // DWARF version number 2564 sizeof(int32_t) + // Offset Into Abbrev. Section 2565 sizeof(int8_t) + // Pointer Size (in bytes) 2566 sizeof(int32_t); // FIXME - extra pad for gdb bug. 2567 2568 Asm->OutStreamer.AddComment("Length of Compilation Unit Info"); 2569 Asm->EmitInt32(ContentSize); 2570 Asm->OutStreamer.AddComment("DWARF version number"); 2571 Asm->EmitInt16(dwarf::DWARF_VERSION); 2572 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section"); 2573 EmitSectionOffset(getTempLabel("abbrev_begin"),getTempLabel("section_abbrev"), 2574 true); 2575 Asm->OutStreamer.AddComment("Address Size (in bytes)"); 2576 Asm->EmitInt8(TD->getPointerSize()); 2577 2578 emitDIE(Die); 2579 // FIXME - extra padding for gdb bug. 2580 Asm->OutStreamer.AddComment("4 extra padding bytes for GDB"); 2581 Asm->EmitInt8(0); 2582 Asm->EmitInt8(0); 2583 Asm->EmitInt8(0); 2584 Asm->EmitInt8(0); 2585 Asm->OutStreamer.EmitLabel(getDWLabel("info_end", ModuleCU->getID())); 2586} 2587 2588/// emitAbbreviations - Emit the abbreviation section. 2589/// 2590void DwarfDebug::emitAbbreviations() const { 2591 // Check to see if it is worth the effort. 2592 if (!Abbreviations.empty()) { 2593 // Start the debug abbrev section. 2594 Asm->OutStreamer.SwitchSection( 2595 Asm->getObjFileLowering().getDwarfAbbrevSection()); 2596 2597 Asm->OutStreamer.EmitLabel(getTempLabel("abbrev_begin")); 2598 2599 // For each abbrevation. 2600 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) { 2601 // Get abbreviation data 2602 const DIEAbbrev *Abbrev = Abbreviations[i]; 2603 2604 // Emit the abbrevations code (base 1 index.) 2605 EmitULEB128(Abbrev->getNumber(), "Abbreviation Code"); 2606 2607 // Emit the abbreviations data. 2608 Abbrev->Emit(this); 2609 } 2610 2611 // Mark end of abbreviations. 2612 EmitULEB128(0, "EOM(3)"); 2613 2614 Asm->OutStreamer.EmitLabel(getTempLabel("abbrev_end")); 2615 } 2616} 2617 2618/// emitEndOfLineMatrix - Emit the last address of the section and the end of 2619/// the line matrix. 2620/// 2621void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) { 2622 // Define last address of section. 2623 Asm->OutStreamer.AddComment("Extended Op"); 2624 Asm->EmitInt8(0); 2625 2626 Asm->OutStreamer.AddComment("Op size"); 2627 Asm->EmitInt8(TD->getPointerSize() + 1); 2628 Asm->OutStreamer.AddComment("DW_LNE_set_address"); 2629 Asm->EmitInt8(dwarf::DW_LNE_set_address); 2630 2631 Asm->OutStreamer.AddComment("Section end label"); 2632 2633 Asm->OutStreamer.EmitSymbolValue(getDWLabel("section_end", SectionEnd), 2634 TD->getPointerSize(), 0/*AddrSpace*/); 2635 2636 // Mark end of matrix. 2637 Asm->OutStreamer.AddComment("DW_LNE_end_sequence"); 2638 Asm->EmitInt8(0); 2639 Asm->EmitInt8(1); 2640 Asm->EmitInt8(1); 2641} 2642 2643/// emitDebugLines - Emit source line information. 2644/// 2645void DwarfDebug::emitDebugLines() { 2646 // If the target is using .loc/.file, the assembler will be emitting the 2647 // .debug_line table automatically. 2648 if (MAI->hasDotLocAndDotFile()) 2649 return; 2650 2651 // Minimum line delta, thus ranging from -10..(255-10). 2652 const int MinLineDelta = -(dwarf::DW_LNS_fixed_advance_pc + 1); 2653 // Maximum line delta, thus ranging from -10..(255-10). 2654 const int MaxLineDelta = 255 + MinLineDelta; 2655 2656 // Start the dwarf line section. 2657 Asm->OutStreamer.SwitchSection( 2658 Asm->getObjFileLowering().getDwarfLineSection()); 2659 2660 // Construct the section header. 2661 Asm->OutStreamer.AddComment("Length of Source Line Info"); 2662 EmitDifference(getTempLabel("line_end"), getTempLabel("line_begin"), true); 2663 Asm->OutStreamer.EmitLabel(getTempLabel("line_begin")); 2664 2665 Asm->OutStreamer.AddComment("DWARF version number"); 2666 Asm->EmitInt16(dwarf::DWARF_VERSION); 2667 2668 Asm->OutStreamer.AddComment("Prolog Length"); 2669 EmitDifference(getTempLabel("line_prolog_end"), 2670 getTempLabel("line_prolog_begin"), true); 2671 Asm->OutStreamer.EmitLabel(getTempLabel("line_prolog_begin")); 2672 2673 Asm->OutStreamer.AddComment("Minimum Instruction Length"); 2674 Asm->EmitInt8(1); 2675 Asm->OutStreamer.AddComment("Default is_stmt_start flag"); 2676 Asm->EmitInt8(1); 2677 Asm->OutStreamer.AddComment("Line Base Value (Special Opcodes)"); 2678 Asm->EmitInt8(MinLineDelta); 2679 Asm->OutStreamer.AddComment("Line Range Value (Special Opcodes)"); 2680 Asm->EmitInt8(MaxLineDelta); 2681 Asm->OutStreamer.AddComment("Special Opcode Base"); 2682 Asm->EmitInt8(-MinLineDelta); 2683 2684 // Line number standard opcode encodings argument count 2685 Asm->OutStreamer.AddComment("DW_LNS_copy arg count"); 2686 Asm->EmitInt8(0); 2687 Asm->OutStreamer.AddComment("DW_LNS_advance_pc arg count"); 2688 Asm->EmitInt8(1); 2689 Asm->OutStreamer.AddComment("DW_LNS_advance_line arg count"); 2690 Asm->EmitInt8(1); 2691 Asm->OutStreamer.AddComment("DW_LNS_set_file arg count"); 2692 Asm->EmitInt8(1); 2693 Asm->OutStreamer.AddComment("DW_LNS_set_column arg count"); 2694 Asm->EmitInt8(1); 2695 Asm->OutStreamer.AddComment("DW_LNS_negate_stmt arg count"); 2696 Asm->EmitInt8(0); 2697 Asm->OutStreamer.AddComment("DW_LNS_set_basic_block arg count"); 2698 Asm->EmitInt8(0); 2699 Asm->OutStreamer.AddComment("DW_LNS_const_add_pc arg count"); 2700 Asm->EmitInt8(0); 2701 Asm->OutStreamer.AddComment("DW_LNS_fixed_advance_pc arg count"); 2702 Asm->EmitInt8(1); 2703 2704 // Emit directories. 2705 for (unsigned DI = 1, DE = getNumSourceDirectories()+1; DI != DE; ++DI) { 2706 const std::string &Dir = getSourceDirectoryName(DI); 2707 if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("Directory"); 2708 Asm->OutStreamer.EmitBytes(StringRef(Dir.c_str(), Dir.size()+1), 0); 2709 } 2710 2711 Asm->OutStreamer.AddComment("End of directories"); 2712 Asm->EmitInt8(0); 2713 2714 // Emit files. 2715 for (unsigned SI = 1, SE = getNumSourceIds()+1; SI != SE; ++SI) { 2716 // Remember source id starts at 1. 2717 std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(SI); 2718 const std::string &FN = getSourceFileName(Id.second); 2719 if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("Source"); 2720 Asm->OutStreamer.EmitBytes(StringRef(FN.c_str(), FN.size()+1), 0); 2721 2722 EmitULEB128(Id.first, "Directory #"); 2723 EmitULEB128(0, "Mod date"); 2724 EmitULEB128(0, "File size"); 2725 } 2726 2727 Asm->OutStreamer.AddComment("End of files"); 2728 Asm->EmitInt8(0); 2729 2730 Asm->OutStreamer.EmitLabel(getTempLabel("line_prolog_end")); 2731 2732 // A sequence for each text section. 2733 unsigned SecSrcLinesSize = SectionSourceLines.size(); 2734 2735 for (unsigned j = 0; j < SecSrcLinesSize; ++j) { 2736 // Isolate current sections line info. 2737 const std::vector<SrcLineInfo> &LineInfos = SectionSourceLines[j]; 2738 2739 // Dwarf assumes we start with first line of first source file. 2740 unsigned Source = 1; 2741 unsigned Line = 1; 2742 2743 // Construct rows of the address, source, line, column matrix. 2744 for (unsigned i = 0, N = LineInfos.size(); i < N; ++i) { 2745 const SrcLineInfo &LineInfo = LineInfos[i]; 2746 MCSymbol *Label = LineInfo.getLabel(); 2747 if (!Label->isDefined()) continue; // Not emitted, in dead code. 2748 2749 if (LineInfo.getLine() == 0) continue; 2750 2751 if (Asm->isVerbose()) { 2752 std::pair<unsigned, unsigned> SrcID = 2753 getSourceDirectoryAndFileIds(LineInfo.getSourceID()); 2754 Asm->OutStreamer.AddComment(Twine(getSourceDirectoryName(SrcID.first)) + 2755 "/" + 2756 Twine(getSourceFileName(SrcID.second)) + 2757 ":" + Twine(LineInfo.getLine())); 2758 } 2759 2760 // Define the line address. 2761 Asm->OutStreamer.AddComment("Extended Op"); 2762 Asm->EmitInt8(0); 2763 Asm->OutStreamer.AddComment("Op size"); 2764 Asm->EmitInt8(TD->getPointerSize() + 1); 2765 2766 Asm->OutStreamer.AddComment("DW_LNE_set_address"); 2767 Asm->EmitInt8(dwarf::DW_LNE_set_address); 2768 2769 Asm->OutStreamer.AddComment("Location label"); 2770 Asm->OutStreamer.EmitSymbolValue(Label, TD->getPointerSize(), 2771 0/*AddrSpace*/); 2772 2773 // If change of source, then switch to the new source. 2774 if (Source != LineInfo.getSourceID()) { 2775 Source = LineInfo.getSourceID(); 2776 Asm->OutStreamer.AddComment("DW_LNS_set_file"); 2777 Asm->EmitInt8(dwarf::DW_LNS_set_file); 2778 EmitULEB128(Source, "New Source"); 2779 } 2780 2781 // If change of line. 2782 if (Line != LineInfo.getLine()) { 2783 // Determine offset. 2784 int Offset = LineInfo.getLine() - Line; 2785 int Delta = Offset - MinLineDelta; 2786 2787 // Update line. 2788 Line = LineInfo.getLine(); 2789 2790 // If delta is small enough and in range... 2791 if (Delta >= 0 && Delta < (MaxLineDelta - 1)) { 2792 // ... then use fast opcode. 2793 Asm->OutStreamer.AddComment("Line Delta"); 2794 Asm->EmitInt8(Delta - MinLineDelta); 2795 } else { 2796 // ... otherwise use long hand. 2797 Asm->OutStreamer.AddComment("DW_LNS_advance_line"); 2798 Asm->EmitInt8(dwarf::DW_LNS_advance_line); 2799 EmitSLEB128(Offset, "Line Offset"); 2800 Asm->OutStreamer.AddComment("DW_LNS_copy"); 2801 Asm->EmitInt8(dwarf::DW_LNS_copy); 2802 } 2803 } else { 2804 // Copy the previous row (different address or source) 2805 Asm->OutStreamer.AddComment("DW_LNS_copy"); 2806 Asm->EmitInt8(dwarf::DW_LNS_copy); 2807 } 2808 } 2809 2810 emitEndOfLineMatrix(j + 1); 2811 } 2812 2813 if (SecSrcLinesSize == 0) 2814 // Because we're emitting a debug_line section, we still need a line 2815 // table. The linker and friends expect it to exist. If there's nothing to 2816 // put into it, emit an empty table. 2817 emitEndOfLineMatrix(1); 2818 2819 Asm->OutStreamer.EmitLabel(getTempLabel("line_end")); 2820} 2821 2822/// emitCommonDebugFrame - Emit common frame info into a debug frame section. 2823/// 2824void DwarfDebug::emitCommonDebugFrame() { 2825 if (!MAI->doesDwarfRequireFrameSection()) 2826 return; 2827 2828 int stackGrowth = 2829 Asm->TM.getFrameInfo()->getStackGrowthDirection() == 2830 TargetFrameInfo::StackGrowsUp ? 2831 TD->getPointerSize() : -TD->getPointerSize(); 2832 2833 // Start the dwarf frame section. 2834 Asm->OutStreamer.SwitchSection( 2835 Asm->getObjFileLowering().getDwarfFrameSection()); 2836 2837 Asm->OutStreamer.EmitLabel(getTempLabel("debug_frame_common")); 2838 Asm->OutStreamer.AddComment("Length of Common Information Entry"); 2839 EmitDifference(getTempLabel("debug_frame_common_end"), 2840 getTempLabel("debug_frame_common_begin"), true); 2841 2842 Asm->OutStreamer.EmitLabel(getTempLabel("debug_frame_common_begin")); 2843 Asm->OutStreamer.AddComment("CIE Identifier Tag"); 2844 Asm->EmitInt32((int)dwarf::DW_CIE_ID); 2845 Asm->OutStreamer.AddComment("CIE Version"); 2846 Asm->EmitInt8(dwarf::DW_CIE_VERSION); 2847 Asm->OutStreamer.AddComment("CIE Augmentation"); 2848 Asm->OutStreamer.EmitIntValue(0, 1, /*addrspace*/0); // nul terminator. 2849 EmitULEB128(1, "CIE Code Alignment Factor"); 2850 EmitSLEB128(stackGrowth, "CIE Data Alignment Factor"); 2851 Asm->OutStreamer.AddComment("CIE RA Column"); 2852 Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), false)); 2853 2854 std::vector<MachineMove> Moves; 2855 RI->getInitialFrameState(Moves); 2856 2857 EmitFrameMoves(0, Moves, false); 2858 2859 Asm->EmitAlignment(2, 0, 0, false); 2860 Asm->OutStreamer.EmitLabel(getTempLabel("debug_frame_common_end")); 2861} 2862 2863/// emitFunctionDebugFrame - Emit per function frame info into a debug frame 2864/// section. 2865void DwarfDebug:: 2866emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo) { 2867 if (!MAI->doesDwarfRequireFrameSection()) 2868 return; 2869 2870 // Start the dwarf frame section. 2871 Asm->OutStreamer.SwitchSection( 2872 Asm->getObjFileLowering().getDwarfFrameSection()); 2873 2874 Asm->OutStreamer.AddComment("Length of Frame Information Entry"); 2875 MCSymbol *DebugFrameBegin = 2876 getDWLabel("debug_frame_begin", DebugFrameInfo.Number); 2877 MCSymbol *DebugFrameEnd = 2878 getDWLabel("debug_frame_end", DebugFrameInfo.Number); 2879 EmitDifference(DebugFrameEnd, DebugFrameBegin, true); 2880 2881 Asm->OutStreamer.EmitLabel(DebugFrameBegin); 2882 2883 Asm->OutStreamer.AddComment("FDE CIE offset"); 2884 EmitSectionOffset(getTempLabel("debug_frame_common"), 2885 getTempLabel("section_debug_frame"), true); 2886 2887 Asm->OutStreamer.AddComment("FDE initial location"); 2888 MCSymbol *FuncBeginSym = getDWLabel("func_begin", DebugFrameInfo.Number); 2889 Asm->OutStreamer.EmitSymbolValue(FuncBeginSym, 2890 TD->getPointerSize(), 0/*AddrSpace*/); 2891 2892 2893 Asm->OutStreamer.AddComment("FDE address range"); 2894 EmitDifference(getDWLabel("func_end", DebugFrameInfo.Number), FuncBeginSym); 2895 2896 EmitFrameMoves(FuncBeginSym, DebugFrameInfo.Moves, false); 2897 2898 Asm->EmitAlignment(2, 0, 0, false); 2899 Asm->OutStreamer.EmitLabel(DebugFrameEnd); 2900} 2901 2902/// emitDebugPubNames - Emit visible names into a debug pubnames section. 2903/// 2904void DwarfDebug::emitDebugPubNames() { 2905 // Start the dwarf pubnames section. 2906 Asm->OutStreamer.SwitchSection( 2907 Asm->getObjFileLowering().getDwarfPubNamesSection()); 2908 2909 Asm->OutStreamer.AddComment("Length of Public Names Info"); 2910 EmitDifference(getDWLabel("pubnames_end", ModuleCU->getID()), 2911 getDWLabel("pubnames_begin", ModuleCU->getID()), true); 2912 2913 Asm->OutStreamer.EmitLabel(getDWLabel("pubnames_begin", ModuleCU->getID())); 2914 2915 Asm->OutStreamer.AddComment("DWARF Version"); 2916 Asm->EmitInt16(dwarf::DWARF_VERSION); 2917 2918 Asm->OutStreamer.AddComment("Offset of Compilation Unit Info"); 2919 EmitSectionOffset(getDWLabel("info_begin", ModuleCU->getID()), 2920 getTempLabel("section_info"), true); 2921 2922 Asm->OutStreamer.AddComment("Compilation Unit Length"); 2923 EmitDifference(getDWLabel("info_end", ModuleCU->getID()), 2924 getDWLabel("info_begin", ModuleCU->getID()), 2925 true); 2926 2927 const StringMap<DIE*> &Globals = ModuleCU->getGlobals(); 2928 for (StringMap<DIE*>::const_iterator 2929 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) { 2930 const char *Name = GI->getKeyData(); 2931 DIE *Entity = GI->second; 2932 2933 Asm->OutStreamer.AddComment("DIE offset"); 2934 Asm->EmitInt32(Entity->getOffset()); 2935 2936 if (Asm->VerboseAsm) 2937 Asm->OutStreamer.AddComment("External Name"); 2938 Asm->OutStreamer.EmitBytes(StringRef(Name, strlen(Name)+1), 0); 2939 } 2940 2941 Asm->OutStreamer.AddComment("End Mark"); 2942 Asm->EmitInt32(0); 2943 Asm->OutStreamer.EmitLabel(getDWLabel("pubnames_end", ModuleCU->getID())); 2944} 2945 2946void DwarfDebug::emitDebugPubTypes() { 2947 // Start the dwarf pubnames section. 2948 Asm->OutStreamer.SwitchSection( 2949 Asm->getObjFileLowering().getDwarfPubTypesSection()); 2950 Asm->OutStreamer.AddComment("Length of Public Types Info"); 2951 EmitDifference(getDWLabel("pubtypes_end", ModuleCU->getID()), 2952 getDWLabel("pubtypes_begin", ModuleCU->getID()), true); 2953 2954 Asm->OutStreamer.EmitLabel(getDWLabel("pubtypes_begin", ModuleCU->getID())); 2955 2956 if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("DWARF Version"); 2957 Asm->EmitInt16(dwarf::DWARF_VERSION); 2958 2959 Asm->OutStreamer.AddComment("Offset of Compilation ModuleCU Info"); 2960 EmitSectionOffset(getDWLabel("info_begin", ModuleCU->getID()), 2961 getTempLabel("section_info"), true); 2962 2963 Asm->OutStreamer.AddComment("Compilation ModuleCU Length"); 2964 EmitDifference(getDWLabel("info_end", ModuleCU->getID()), 2965 getDWLabel("info_begin", ModuleCU->getID()), 2966 true); 2967 2968 const StringMap<DIE*> &Globals = ModuleCU->getGlobalTypes(); 2969 for (StringMap<DIE*>::const_iterator 2970 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) { 2971 const char *Name = GI->getKeyData(); 2972 DIE * Entity = GI->second; 2973 2974 if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("DIE offset"); 2975 Asm->EmitInt32(Entity->getOffset()); 2976 2977 if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("External Name"); 2978 Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1), 0); 2979 } 2980 2981 Asm->OutStreamer.AddComment("End Mark"); 2982 Asm->EmitInt32(0); 2983 Asm->OutStreamer.EmitLabel(getDWLabel("pubtypes_end", ModuleCU->getID())); 2984} 2985 2986/// emitDebugStr - Emit visible names into a debug str section. 2987/// 2988void DwarfDebug::emitDebugStr() { 2989 // Check to see if it is worth the effort. 2990 if (StringPool.empty()) return; 2991 2992 // Start the dwarf str section. 2993 Asm->OutStreamer.SwitchSection( 2994 Asm->getObjFileLowering().getDwarfStrSection()); 2995 2996 // Get all of the string pool entries and put them in an array by their ID so 2997 // we can sort them. 2998 SmallVector<std::pair<unsigned, 2999 StringMapEntry<std::pair<MCSymbol*, unsigned> >*>, 64> Entries; 3000 3001 for (StringMap<std::pair<MCSymbol*, unsigned> >::iterator 3002 I = StringPool.begin(), E = StringPool.end(); I != E; ++I) 3003 Entries.push_back(std::make_pair(I->second.second, &*I)); 3004 3005 array_pod_sort(Entries.begin(), Entries.end()); 3006 3007 for (unsigned i = 0, e = Entries.size(); i != e; ++i) { 3008 // Emit a label for reference from debug information entries. 3009 Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first); 3010 3011 // Emit the string itself. 3012 Asm->OutStreamer.EmitBytes(Entries[i].second->getKey(), 0/*addrspace*/); 3013 } 3014} 3015 3016/// emitDebugLoc - Emit visible names into a debug loc section. 3017/// 3018void DwarfDebug::emitDebugLoc() { 3019 // Start the dwarf loc section. 3020 Asm->OutStreamer.SwitchSection( 3021 Asm->getObjFileLowering().getDwarfLocSection()); 3022} 3023 3024/// EmitDebugARanges - Emit visible names into a debug aranges section. 3025/// 3026void DwarfDebug::EmitDebugARanges() { 3027 // Start the dwarf aranges section. 3028 Asm->OutStreamer.SwitchSection( 3029 Asm->getObjFileLowering().getDwarfARangesSection()); 3030} 3031 3032/// emitDebugRanges - Emit visible names into a debug ranges section. 3033/// 3034void DwarfDebug::emitDebugRanges() { 3035 // Start the dwarf ranges section. 3036 Asm->OutStreamer.SwitchSection( 3037 Asm->getObjFileLowering().getDwarfRangesSection()); 3038} 3039 3040/// emitDebugMacInfo - Emit visible names into a debug macinfo section. 3041/// 3042void DwarfDebug::emitDebugMacInfo() { 3043 if (const MCSection *LineInfo = 3044 Asm->getObjFileLowering().getDwarfMacroInfoSection()) { 3045 // Start the dwarf macinfo section. 3046 Asm->OutStreamer.SwitchSection(LineInfo); 3047 } 3048} 3049 3050/// emitDebugInlineInfo - Emit inline info using following format. 3051/// Section Header: 3052/// 1. length of section 3053/// 2. Dwarf version number 3054/// 3. address size. 3055/// 3056/// Entries (one "entry" for each function that was inlined): 3057/// 3058/// 1. offset into __debug_str section for MIPS linkage name, if exists; 3059/// otherwise offset into __debug_str for regular function name. 3060/// 2. offset into __debug_str section for regular function name. 3061/// 3. an unsigned LEB128 number indicating the number of distinct inlining 3062/// instances for the function. 3063/// 3064/// The rest of the entry consists of a {die_offset, low_pc} pair for each 3065/// inlined instance; the die_offset points to the inlined_subroutine die in the 3066/// __debug_info section, and the low_pc is the starting address for the 3067/// inlining instance. 3068void DwarfDebug::emitDebugInlineInfo() { 3069 if (!MAI->doesDwarfUsesInlineInfoSection()) 3070 return; 3071 3072 if (!ModuleCU) 3073 return; 3074 3075 Asm->OutStreamer.SwitchSection( 3076 Asm->getObjFileLowering().getDwarfDebugInlineSection()); 3077 3078 Asm->OutStreamer.AddComment("Length of Debug Inlined Information Entry"); 3079 EmitDifference(getDWLabel("debug_inlined_end", 1), 3080 getDWLabel("debug_inlined_begin", 1), true); 3081 3082 Asm->OutStreamer.EmitLabel(getDWLabel("debug_inlined_begin", 1)); 3083 3084 Asm->OutStreamer.AddComment("Dwarf Version"); 3085 Asm->EmitInt16(dwarf::DWARF_VERSION); 3086 Asm->OutStreamer.AddComment("Address Size (in bytes)"); 3087 Asm->EmitInt8(TD->getPointerSize()); 3088 3089 for (SmallVector<MDNode *, 4>::iterator I = InlinedSPNodes.begin(), 3090 E = InlinedSPNodes.end(); I != E; ++I) { 3091 3092 MDNode *Node = *I; 3093 DenseMap<MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator II 3094 = InlineInfo.find(Node); 3095 SmallVector<InlineInfoLabels, 4> &Labels = II->second; 3096 DISubprogram SP(Node); 3097 StringRef LName = SP.getLinkageName(); 3098 StringRef Name = SP.getName(); 3099 3100 Asm->OutStreamer.AddComment("MIPS linkage name"); 3101 if (LName.empty()) { 3102 Asm->OutStreamer.EmitBytes(Name, 0); 3103 Asm->OutStreamer.EmitIntValue(0, 1, 0); // nul terminator. 3104 } else 3105 EmitSectionOffset(getStringPoolEntry(getRealLinkageName(LName)), 3106 getTempLabel("section_str"), true); 3107 3108 Asm->OutStreamer.AddComment("Function name"); 3109 EmitSectionOffset(getStringPoolEntry(Name), getTempLabel("section_str"), 3110 true); 3111 EmitULEB128(Labels.size(), "Inline count"); 3112 3113 for (SmallVector<InlineInfoLabels, 4>::iterator LI = Labels.begin(), 3114 LE = Labels.end(); LI != LE; ++LI) { 3115 if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("DIE offset"); 3116 Asm->EmitInt32(LI->second->getOffset()); 3117 3118 if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("low_pc"); 3119 Asm->OutStreamer.EmitSymbolValue(LI->first, TD->getPointerSize(), 0); 3120 } 3121 } 3122 3123 Asm->OutStreamer.EmitLabel(getDWLabel("debug_inlined_end", 1)); 3124} 3125