DwarfDebug.h revision 01776a5a9480243f95fff50c96e3f35fad41e4cb
1//===-- llvm/CodeGen/DwarfDebug.h - Dwarf Debug Framework ------*- C++ -*--===// 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#ifndef CODEGEN_ASMPRINTER_DWARFDEBUG_H__ 15#define CODEGEN_ASMPRINTER_DWARFDEBUG_H__ 16 17#include "DIE.h" 18#include "llvm/ADT/DenseMap.h" 19#include "llvm/ADT/FoldingSet.h" 20#include "llvm/ADT/SetVector.h" 21#include "llvm/ADT/SmallPtrSet.h" 22#include "llvm/ADT/StringMap.h" 23#include "llvm/CodeGen/AsmPrinter.h" 24#include "llvm/CodeGen/LexicalScopes.h" 25#include "llvm/DebugInfo.h" 26#include "llvm/MC/MachineLocation.h" 27#include "llvm/Support/Allocator.h" 28#include "llvm/Support/DebugLoc.h" 29 30namespace llvm { 31 32class CompileUnit; 33class ConstantInt; 34class ConstantFP; 35class DbgVariable; 36class MachineFrameInfo; 37class MachineModuleInfo; 38class MachineOperand; 39class MCAsmInfo; 40class DIEAbbrev; 41class DIE; 42class DIEBlock; 43class DIEEntry; 44class DwarfDebug; 45 46//===----------------------------------------------------------------------===// 47/// \brief This class is used to record source line correspondence. 48class SrcLineInfo { 49 unsigned Line; // Source line number. 50 unsigned Column; // Source column. 51 unsigned SourceID; // Source ID number. 52 MCSymbol *Label; // Label in code ID number. 53public: 54 SrcLineInfo(unsigned L, unsigned C, unsigned S, MCSymbol *label) 55 : Line(L), Column(C), SourceID(S), Label(label) {} 56 57 // Accessors 58 unsigned getLine() const { return Line; } 59 unsigned getColumn() const { return Column; } 60 unsigned getSourceID() const { return SourceID; } 61 MCSymbol *getLabel() const { return Label; } 62}; 63 64/// \brief This struct describes location entries emitted in the .debug_loc 65/// section. 66typedef struct DotDebugLocEntry { 67 const MCSymbol *Begin; 68 const MCSymbol *End; 69 MachineLocation Loc; 70 const MDNode *Variable; 71 bool Merged; 72 bool Constant; 73 enum EntryType { 74 E_Location, 75 E_Integer, 76 E_ConstantFP, 77 E_ConstantInt 78 }; 79 enum EntryType EntryKind; 80 81 union { 82 int64_t Int; 83 const ConstantFP *CFP; 84 const ConstantInt *CIP; 85 } Constants; 86 DotDebugLocEntry() 87 : Begin(0), End(0), Variable(0), Merged(false), 88 Constant(false) { Constants.Int = 0;} 89 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, MachineLocation &L, 90 const MDNode *V) 91 : Begin(B), End(E), Loc(L), Variable(V), Merged(false), 92 Constant(false) { Constants.Int = 0; EntryKind = E_Location; } 93 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, int64_t i) 94 : Begin(B), End(E), Variable(0), Merged(false), 95 Constant(true) { Constants.Int = i; EntryKind = E_Integer; } 96 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantFP *FPtr) 97 : Begin(B), End(E), Variable(0), Merged(false), 98 Constant(true) { Constants.CFP = FPtr; EntryKind = E_ConstantFP; } 99 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, 100 const ConstantInt *IPtr) 101 : Begin(B), End(E), Variable(0), Merged(false), 102 Constant(true) { Constants.CIP = IPtr; EntryKind = E_ConstantInt; } 103 104 /// \brief Empty entries are also used as a trigger to emit temp label. Such 105 /// labels are referenced is used to find debug_loc offset for a given DIE. 106 bool isEmpty() { return Begin == 0 && End == 0; } 107 bool isMerged() { return Merged; } 108 void Merge(DotDebugLocEntry *Next) { 109 if (!(Begin && Loc == Next->Loc && End == Next->Begin)) 110 return; 111 Next->Begin = Begin; 112 Merged = true; 113 } 114 bool isLocation() const { return EntryKind == E_Location; } 115 bool isInt() const { return EntryKind == E_Integer; } 116 bool isConstantFP() const { return EntryKind == E_ConstantFP; } 117 bool isConstantInt() const { return EntryKind == E_ConstantInt; } 118 int64_t getInt() { return Constants.Int; } 119 const ConstantFP *getConstantFP() { return Constants.CFP; } 120 const ConstantInt *getConstantInt() { return Constants.CIP; } 121} DotDebugLocEntry; 122 123//===----------------------------------------------------------------------===// 124/// \brief This class is used to track local variable information. 125class DbgVariable { 126 DIVariable Var; // Variable Descriptor. 127 DIE *TheDIE; // Variable DIE. 128 unsigned DotDebugLocOffset; // Offset in DotDebugLocEntries. 129 DbgVariable *AbsVar; // Corresponding Abstract variable, if any. 130 const MachineInstr *MInsn; // DBG_VALUE instruction of the variable. 131 int FrameIndex; 132public: 133 // AbsVar may be NULL. 134 DbgVariable(DIVariable V, DbgVariable *AV) 135 : Var(V), TheDIE(0), DotDebugLocOffset(~0U), AbsVar(AV), MInsn(0), 136 FrameIndex(~0) {} 137 138 // Accessors. 139 DIVariable getVariable() const { return Var; } 140 void setDIE(DIE *D) { TheDIE = D; } 141 DIE *getDIE() const { return TheDIE; } 142 void setDotDebugLocOffset(unsigned O) { DotDebugLocOffset = O; } 143 unsigned getDotDebugLocOffset() const { return DotDebugLocOffset; } 144 StringRef getName() const { return Var.getName(); } 145 DbgVariable *getAbstractVariable() const { return AbsVar; } 146 const MachineInstr *getMInsn() const { return MInsn; } 147 void setMInsn(const MachineInstr *M) { MInsn = M; } 148 int getFrameIndex() const { return FrameIndex; } 149 void setFrameIndex(int FI) { FrameIndex = FI; } 150 // Translate tag to proper Dwarf tag. 151 unsigned getTag() const { 152 if (Var.getTag() == dwarf::DW_TAG_arg_variable) 153 return dwarf::DW_TAG_formal_parameter; 154 155 return dwarf::DW_TAG_variable; 156 } 157 /// \brief Return true if DbgVariable is artificial. 158 bool isArtificial() const { 159 if (Var.isArtificial()) 160 return true; 161 if (getType().isArtificial()) 162 return true; 163 return false; 164 } 165 166 bool isObjectPointer() const { 167 if (Var.isObjectPointer()) 168 return true; 169 if (getType().isObjectPointer()) 170 return true; 171 return false; 172 } 173 174 bool variableHasComplexAddress() const { 175 assert(Var.Verify() && "Invalid complex DbgVariable!"); 176 return Var.hasComplexAddress(); 177 } 178 bool isBlockByrefVariable() const { 179 assert(Var.Verify() && "Invalid complex DbgVariable!"); 180 return Var.isBlockByrefVariable(); 181 } 182 unsigned getNumAddrElements() const { 183 assert(Var.Verify() && "Invalid complex DbgVariable!"); 184 return Var.getNumAddrElements(); 185 } 186 uint64_t getAddrElement(unsigned i) const { 187 return Var.getAddrElement(i); 188 } 189 DIType getType() const; 190}; 191 192 193// A String->Symbol mapping of strings used by indirect 194// references. 195typedef StringMap<std::pair<MCSymbol*, unsigned>, 196 BumpPtrAllocator&> StrPool; 197 198// A Symbol->pair<Symbol, unsigned> mapping of addresses used by indirect 199// references. 200typedef DenseMap<MCSymbol *, std::pair<MCSymbol *, unsigned> > AddrPool; 201 202/// \brief Collects and handles information specific to a particular 203/// collection of units. 204class DwarfUnits { 205 // Target of Dwarf emission, used for sizing of abbreviations. 206 AsmPrinter *Asm; 207 208 // Used to uniquely define abbreviations. 209 FoldingSet<DIEAbbrev> *AbbreviationsSet; 210 211 // A list of all the unique abbreviations in use. 212 std::vector<DIEAbbrev *> *Abbreviations; 213 214 // A pointer to all units in the section. 215 SmallVector<CompileUnit *, 1> CUs; 216 217 // Collection of strings for this unit and assorted symbols. 218 StrPool StringPool; 219 unsigned NextStringPoolNumber; 220 std::string StringPref; 221 222 // Collection of addresses for this unit and assorted labels. 223 AddrPool AddressPool; 224 unsigned NextAddrPoolNumber; 225 226public: 227 DwarfUnits(AsmPrinter *AP, FoldingSet<DIEAbbrev> *AS, 228 std::vector<DIEAbbrev *> *A, const char *Pref, 229 BumpPtrAllocator &DA) : 230 Asm(AP), AbbreviationsSet(AS), Abbreviations(A), 231 StringPool(DA), NextStringPoolNumber(0), StringPref(Pref), 232 AddressPool(), NextAddrPoolNumber(0) {} 233 234 /// \brief Compute the size and offset of a DIE given an incoming Offset. 235 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset); 236 237 /// \brief Compute the size and offset of all the DIEs. 238 void computeSizeAndOffsets(); 239 240 /// \brief Define a unique number for the abbreviation. 241 void assignAbbrevNumber(DIEAbbrev &Abbrev); 242 243 /// \brief Add a unit to the list of CUs. 244 void addUnit(CompileUnit *CU) { CUs.push_back(CU); } 245 246 /// \brief Emit all of the units to the section listed with the given 247 /// abbreviation section. 248 void emitUnits(DwarfDebug *, const MCSection *, const MCSection *, 249 const MCSymbol *); 250 251 /// \brief Emit all of the strings to the section given. 252 void emitStrings(const MCSection *, const MCSection *, const MCSymbol *); 253 254 /// \brief Emit all of the addresses to the section given. 255 void emitAddresses(const MCSection *); 256 257 /// \brief Returns the entry into the start of the pool. 258 MCSymbol *getStringPoolSym(); 259 260 /// \brief Returns an entry into the string pool with the given 261 /// string text. 262 MCSymbol *getStringPoolEntry(StringRef Str); 263 264 /// \brief Returns the index into the string pool with the given 265 /// string text. 266 unsigned getStringPoolIndex(StringRef Str); 267 268 /// \brief Returns the string pool. 269 StrPool *getStringPool() { return &StringPool; } 270 271 /// \brief Returns the index into the address pool with the given 272 /// label/symbol. 273 unsigned getAddrPoolIndex(MCSymbol *); 274 275 /// \brief Returns the address pool. 276 AddrPool *getAddrPool() { return &AddressPool; } 277}; 278 279/// \brief Collects and handles dwarf debug information. 280class DwarfDebug { 281 // Target of Dwarf emission. 282 AsmPrinter *Asm; 283 284 // Collected machine module information. 285 MachineModuleInfo *MMI; 286 287 // All DIEValues are allocated through this allocator. 288 BumpPtrAllocator DIEValueAllocator; 289 290 //===--------------------------------------------------------------------===// 291 // Attribute used to construct specific Dwarf sections. 292 // 293 294 CompileUnit *FirstCU; 295 296 // Maps MDNode with its corresponding CompileUnit. 297 DenseMap <const MDNode *, CompileUnit *> CUMap; 298 299 // Maps subprogram MDNode with its corresponding CompileUnit. 300 DenseMap <const MDNode *, CompileUnit *> SPMap; 301 302 // Used to uniquely define abbreviations. 303 FoldingSet<DIEAbbrev> AbbreviationsSet; 304 305 // A list of all the unique abbreviations in use. 306 std::vector<DIEAbbrev *> Abbreviations; 307 308 // Source id map, i.e. pair of source filename and directory, 309 // separated by a zero byte, mapped to a unique id. 310 StringMap<unsigned, BumpPtrAllocator&> SourceIdMap; 311 312 // Provides a unique id per text section. 313 SetVector<const MCSection*> SectionMap; 314 315 // List of Arguments (DbgValues) for current function. 316 SmallVector<DbgVariable *, 8> CurrentFnArguments; 317 318 LexicalScopes LScopes; 319 320 // Collection of abstract subprogram DIEs. 321 DenseMap<const MDNode *, DIE *> AbstractSPDies; 322 323 // Collection of dbg variables of a scope. 324 DenseMap<LexicalScope *, SmallVector<DbgVariable *, 8> > ScopeVariables; 325 326 // Collection of abstract variables. 327 DenseMap<const MDNode *, DbgVariable *> AbstractVariables; 328 329 // Collection of DotDebugLocEntry. 330 SmallVector<DotDebugLocEntry, 4> DotDebugLocEntries; 331 332 // Collection of subprogram DIEs that are marked (at the end of the module) 333 // as DW_AT_inline. 334 SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs; 335 336 // Keep track of inlined functions and their location. This 337 // information is used to populate the debug_inlined section. 338 typedef std::pair<const MCSymbol *, DIE *> InlineInfoLabels; 339 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo; 340 SmallVector<const MDNode *, 4> InlinedSPNodes; 341 342 // This is a collection of subprogram MDNodes that are processed to 343 // create DIEs. 344 SmallPtrSet<const MDNode *, 16> ProcessedSPNodes; 345 346 // Maps instruction with label emitted before instruction. 347 DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn; 348 349 // Maps instruction with label emitted after instruction. 350 DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn; 351 352 // Every user variable mentioned by a DBG_VALUE instruction in order of 353 // appearance. 354 SmallVector<const MDNode*, 8> UserVariables; 355 356 // For each user variable, keep a list of DBG_VALUE instructions in order. 357 // The list can also contain normal instructions that clobber the previous 358 // DBG_VALUE. 359 typedef DenseMap<const MDNode*, SmallVector<const MachineInstr*, 4> > 360 DbgValueHistoryMap; 361 DbgValueHistoryMap DbgValues; 362 363 SmallVector<const MCSymbol *, 8> DebugRangeSymbols; 364 365 // Previous instruction's location information. This is used to determine 366 // label location to indicate scope boundries in dwarf debug info. 367 DebugLoc PrevInstLoc; 368 MCSymbol *PrevLabel; 369 370 // This location indicates end of function prologue and beginning of function 371 // body. 372 DebugLoc PrologEndLoc; 373 374 struct FunctionDebugFrameInfo { 375 unsigned Number; 376 std::vector<MachineMove> Moves; 377 378 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M) 379 : Number(Num), Moves(M) {} 380 }; 381 382 std::vector<FunctionDebugFrameInfo> DebugFrames; 383 384 // Section Symbols: these are assembler temporary labels that are emitted at 385 // the beginning of each supported dwarf section. These are used to form 386 // section offsets and are created by EmitSectionLabels. 387 MCSymbol *DwarfInfoSectionSym, *DwarfAbbrevSectionSym; 388 MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym; 389 MCSymbol *DwarfDebugLocSectionSym; 390 MCSymbol *FunctionBeginSym, *FunctionEndSym; 391 MCSymbol *DwarfAbbrevDWOSectionSym, *DwarfStrDWOSectionSym; 392 393 // As an optimization, there is no need to emit an entry in the directory 394 // table for the same directory as DW_at_comp_dir. 395 StringRef CompilationDir; 396 397 // Counter for assigning globally unique IDs for CUs. 398 unsigned GlobalCUIndexCount; 399 400 // Holder for the file specific debug information. 401 DwarfUnits InfoHolder; 402 403 // Holders for the various debug information flags that we might need to 404 // have exposed. See accessor functions below for description. 405 406 // Whether or not we're emitting info for older versions of gdb on darwin. 407 bool IsDarwinGDBCompat; 408 409 // DWARF5 Experimental Options 410 bool HasDwarfAccelTables; 411 bool HasSplitDwarf; 412 413 // Separated Dwarf Variables 414 // In general these will all be for bits that are left in the 415 // original object file, rather than things that are meant 416 // to be in the .dwo sections. 417 418 // The CUs left in the original object file for separated debug info. 419 SmallVector<CompileUnit *, 1> SkeletonCUs; 420 421 // Used to uniquely define abbreviations for the skeleton emission. 422 FoldingSet<DIEAbbrev> SkeletonAbbrevSet; 423 424 // A list of all the unique abbreviations in use. 425 std::vector<DIEAbbrev *> SkeletonAbbrevs; 426 427 // Holder for the skeleton information. 428 DwarfUnits SkeletonHolder; 429 430private: 431 432 void addScopeVariable(LexicalScope *LS, DbgVariable *Var); 433 434 /// \brief Find abstract variable associated with Var. 435 DbgVariable *findAbstractVariable(DIVariable &Var, DebugLoc Loc); 436 437 /// \brief Find DIE for the given subprogram and attach appropriate 438 /// DW_AT_low_pc and DW_AT_high_pc attributes. If there are global 439 /// variables in this scope then create and insert DIEs for these 440 /// variables. 441 DIE *updateSubprogramScopeDIE(CompileUnit *SPCU, const MDNode *SPNode); 442 443 /// \brief Construct new DW_TAG_lexical_block for this scope and 444 /// attach DW_AT_low_pc/DW_AT_high_pc labels. 445 DIE *constructLexicalScopeDIE(CompileUnit *TheCU, LexicalScope *Scope); 446 447 /// \brief This scope represents inlined body of a function. Construct 448 /// DIE to represent this concrete inlined copy of the function. 449 DIE *constructInlinedScopeDIE(CompileUnit *TheCU, LexicalScope *Scope); 450 451 /// \brief Construct a DIE for this scope. 452 DIE *constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope); 453 454 /// \brief Emit initial Dwarf sections with a label at the start of each one. 455 void emitSectionLabels(); 456 457 /// \brief Compute the size and offset of a DIE given an incoming Offset. 458 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset); 459 460 /// \brief Compute the size and offset of all the DIEs. 461 void computeSizeAndOffsets(); 462 463 /// \brief Attach DW_AT_inline attribute with inlined subprogram DIEs. 464 void computeInlinedDIEs(); 465 466 /// \brief Collect info for variables that were optimized out. 467 void collectDeadVariables(); 468 469 /// \brief Finish off debug information after all functions have been 470 /// processed. 471 void finalizeModuleInfo(); 472 473 /// \brief Emit labels to close any remaining sections that have been left 474 /// open. 475 void endSections(); 476 477 /// \brief Emit a set of abbreviations to the specific section. 478 void emitAbbrevs(const MCSection *, std::vector<DIEAbbrev*> *); 479 480 /// \brief Emit the debug info section. 481 void emitDebugInfo(); 482 483 /// \brief Emit the abbreviation section. 484 void emitAbbreviations(); 485 486 /// \brief Emit the last address of the section and the end of 487 /// the line matrix. 488 void emitEndOfLineMatrix(unsigned SectionEnd); 489 490 /// \brief Emit visible names into a hashed accelerator table section. 491 void emitAccelNames(); 492 493 /// \brief Emit objective C classes and categories into a hashed 494 /// accelerator table section. 495 void emitAccelObjC(); 496 497 /// \brief Emit namespace dies into a hashed accelerator table. 498 void emitAccelNamespaces(); 499 500 /// \brief Emit type dies into a hashed accelerator table. 501 void emitAccelTypes(); 502 503 /// \brief Emit visible types into a debug pubtypes section. 504 void emitDebugPubTypes(); 505 506 /// \brief Emit visible names into a debug str section. 507 void emitDebugStr(); 508 509 /// \brief Emit visible names into a debug loc section. 510 void emitDebugLoc(); 511 512 /// \brief Emit visible names into a debug aranges section. 513 void emitDebugARanges(); 514 515 /// \brief Emit visible names into a debug ranges section. 516 void emitDebugRanges(); 517 518 /// \brief Emit visible names into a debug macinfo section. 519 void emitDebugMacInfo(); 520 521 /// \brief Emit inline info using custom format. 522 void emitDebugInlineInfo(); 523 524 /// DWARF 5 Experimental Split Dwarf Emitters 525 526 /// \brief Construct the split debug info compile unit for the debug info 527 /// section. 528 CompileUnit *constructSkeletonCU(const MDNode *); 529 530 /// \brief Emit the local split abbreviations. 531 void emitSkeletonAbbrevs(const MCSection *); 532 533 /// \brief Emit the debug info dwo section. 534 void emitDebugInfoDWO(); 535 536 /// \brief Emit the debug abbrev dwo section. 537 void emitDebugAbbrevDWO(); 538 539 /// \brief Emit the debug str dwo section. 540 void emitDebugStrDWO(); 541 542 /// \brief Create new CompileUnit for the given metadata node with tag 543 /// DW_TAG_compile_unit. 544 CompileUnit *constructCompileUnit(const MDNode *N); 545 546 /// \brief Construct subprogram DIE. 547 void constructSubprogramDIE(CompileUnit *TheCU, const MDNode *N); 548 549 /// \brief Register a source line with debug info. Returns the unique 550 /// label that was emitted and which provides correspondence to the 551 /// source line list. 552 void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope, 553 unsigned Flags); 554 555 /// \brief Indentify instructions that are marking the beginning of or 556 /// ending of a scope. 557 void identifyScopeMarkers(); 558 559 /// \brief If Var is an current function argument that add it in 560 /// CurrentFnArguments list. 561 bool addCurrentFnArgument(const MachineFunction *MF, 562 DbgVariable *Var, LexicalScope *Scope); 563 564 /// \brief Populate LexicalScope entries with variables' info. 565 void collectVariableInfo(const MachineFunction *, 566 SmallPtrSet<const MDNode *, 16> &ProcessedVars); 567 568 /// \brief Collect variable information from the side table maintained 569 /// by MMI. 570 void collectVariableInfoFromMMITable(const MachineFunction * MF, 571 SmallPtrSet<const MDNode *, 16> &P); 572 573 /// \brief Ensure that a label will be emitted before MI. 574 void requestLabelBeforeInsn(const MachineInstr *MI) { 575 LabelsBeforeInsn.insert(std::make_pair(MI, (MCSymbol*)0)); 576 } 577 578 /// \brief Return Label preceding the instruction. 579 MCSymbol *getLabelBeforeInsn(const MachineInstr *MI); 580 581 /// \brief Ensure that a label will be emitted after MI. 582 void requestLabelAfterInsn(const MachineInstr *MI) { 583 LabelsAfterInsn.insert(std::make_pair(MI, (MCSymbol*)0)); 584 } 585 586 /// \brief Return Label immediately following the instruction. 587 MCSymbol *getLabelAfterInsn(const MachineInstr *MI); 588 589public: 590 //===--------------------------------------------------------------------===// 591 // Main entry points. 592 // 593 DwarfDebug(AsmPrinter *A, Module *M); 594 ~DwarfDebug(); 595 596 /// \brief Collect debug info from named mdnodes such as llvm.dbg.enum 597 /// and llvm.dbg.ty 598 void collectInfoFromNamedMDNodes(const Module *M); 599 600 /// \brief Collect debug info using DebugInfoFinder. 601 /// FIXME - Remove this when DragonEgg switches to DIBuilder. 602 bool collectLegacyDebugInfo(const Module *M); 603 604 /// \brief Emit all Dwarf sections that should come prior to the 605 /// content. 606 void beginModule(); 607 608 /// \brief Emit all Dwarf sections that should come after the content. 609 void endModule(); 610 611 /// \brief Gather pre-function debug information. 612 void beginFunction(const MachineFunction *MF); 613 614 /// \brief Gather and emit post-function debug information. 615 void endFunction(const MachineFunction *MF); 616 617 /// \brief Process beginning of an instruction. 618 void beginInstruction(const MachineInstr *MI); 619 620 /// \brief Process end of an instruction. 621 void endInstruction(const MachineInstr *MI); 622 623 /// \brief Look up the source id with the given directory and source file 624 /// names. If none currently exists, create a new id and insert it in the 625 /// SourceIds map. 626 unsigned getOrCreateSourceID(StringRef DirName, StringRef FullName); 627 628 /// \brief Recursively Emits a debug information entry. 629 void emitDIE(DIE *Die, std::vector<DIEAbbrev *> *Abbrevs); 630 631 /// \brief Returns whether or not to limit some of our debug 632 /// output to the limitations of darwin gdb. 633 bool useDarwinGDBCompat() { return IsDarwinGDBCompat; } 634 635 // Experimental DWARF5 features. 636 637 /// \brief Returns whether or not to emit tables that dwarf consumers can 638 /// use to accelerate lookup. 639 bool useDwarfAccelTables() { return HasDwarfAccelTables; } 640 641 /// \brief Returns whether or not to change the current debug info for the 642 /// split dwarf proposal support. 643 bool useSplitDwarf() { return HasSplitDwarf; } 644}; 645} // End of namespace llvm 646 647#endif 648