lib/CodeGen/AsmPrinter/DwarfDebug.h

   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 "DwarfPrinter.h"
  19 #include "llvm/CodeGen/AsmPrinter.h"
  20 #include "llvm/CodeGen/MachineLocation.h"
  21 #include "llvm/Analysis/DebugInfo.h"
  22 #include "llvm/Support/raw_ostream.h"
  23 #include "llvm/ADT/DenseMap.h"
  24 #include "llvm/ADT/FoldingSet.h"
  25 #include "llvm/ADT/SmallSet.h"
  26 #include "llvm/ADT/StringMap.h"
  27 #include "llvm/ADT/UniqueVector.h"
  28 #include <string>
  29
  30 namespace llvm {
  31
  32 class CompileUnit;
  33 class DbgVariable;
  34 class DbgScope;
  35 class DbgConcreteScope;
  36 class MachineFrameInfo;
  37 class MachineModuleInfo;
  38 class TargetAsmInfo;
  39 class Timer;
  40
  41 //===----------------------------------------------------------------------===//
  42 /// SrcLineInfo - This class is used to record source line correspondence.
  43 ///
  44 class VISIBILITY_HIDDEN SrcLineInfo {
  45   unsigned Line;                     // Source line number.
  46   unsigned Column;                   // Source column.
  47   unsigned SourceID;                 // Source ID number.
  48   unsigned LabelID;                  // Label in code ID number.
  49 public:
  50   SrcLineInfo(unsigned L, unsigned C, unsigned S, unsigned I)
  51     : Line(L), Column(C), SourceID(S), LabelID(I) {}
  52
  53   // Accessors
  54   unsigned getLine() const { return Line; }
  55   unsigned getColumn() const { return Column; }
  56   unsigned getSourceID() const { return SourceID; }
  57   unsigned getLabelID() const { return LabelID; }
  58 };
  59
  60 class VISIBILITY_HIDDEN DwarfDebug : public Dwarf {
  61   //===--------------------------------------------------------------------===//
  62   // Attributes used to construct specific Dwarf sections.
  63   //
  64
  65   /// CompileUnitMap - A map of global variables representing compile units to
  66   /// compile units.
  67   DenseMap<Value *, CompileUnit *> CompileUnitMap;
  68
  69   /// CompileUnits - All the compile units in this module.
  70   ///
  71   SmallVector<CompileUnit *, 8> CompileUnits;
  72
  73   /// ModuleCU - All DIEs are inserted in ModuleCU.
  74   CompileUnit *ModuleCU;
  75
  76   /// AbbreviationsSet - Used to uniquely define abbreviations.
  77   ///
  78   FoldingSet<DIEAbbrev> AbbreviationsSet;
  79
  80   /// Abbreviations - A list of all the unique abbreviations in use.
  81   ///
  82   std::vector<DIEAbbrev *> Abbreviations;
  83
  84   /// DirectoryIdMap - Directory name to directory id map.
  85   ///
  86   StringMap<unsigned> DirectoryIdMap;
  87
  88   /// DirectoryNames - A list of directory names.
  89   SmallVector<std::string, 8> DirectoryNames;
  90
  91   /// SourceFileIdMap - Source file name to source file id map.
  92   ///
  93   StringMap<unsigned> SourceFileIdMap;
  94
  95   /// SourceFileNames - A list of source file names.
  96   SmallVector<std::string, 8> SourceFileNames;
  97
  98   /// SourceIdMap - Source id map, i.e. pair of directory id and source file
  99   /// id mapped to a unique id.
 100   DenseMap<std::pair<unsigned, unsigned>, unsigned> SourceIdMap;
 101
 102   /// SourceIds - Reverse map from source id to directory id + file id pair.
 103   ///
 104   SmallVector<std::pair<unsigned, unsigned>, 8> SourceIds;
 105
 106   /// Lines - List of of source line correspondence.
 107   std::vector<SrcLineInfo> Lines;
 108
 109   /// ValuesSet - Used to uniquely define values.
 110   ///
 111   FoldingSet<DIEValue> ValuesSet;
 112
 113   /// Values - A list of all the unique values in use.
 114   ///
 115   std::vector<DIEValue *> Values;
 116
 117   /// StringPool - A UniqueVector of strings used by indirect references.
 118   ///
 119   UniqueVector<std::string> StringPool;
 120
 121   /// SectionMap - Provides a unique id per text section.
 122   ///
 123   UniqueVector<const MCSection*> SectionMap;
 124
 125   /// SectionSourceLines - Tracks line numbers per text section.
 126   ///
 127   std::vector<std::vector<SrcLineInfo> > SectionSourceLines;
 128
 129   /// didInitial - Flag to indicate if initial emission has been done.
 130   ///
 131   bool didInitial;
 132
 133   /// shouldEmit - Flag to indicate if debug information should be emitted.
 134   ///
 135   bool shouldEmit;
 136
 137   // FunctionDbgScope - Top level scope for the current function.
 138   //
 139   DbgScope *FunctionDbgScope;
 140
 141   /// DbgScopeMap - Tracks the scopes in the current function.
 142   DenseMap<GlobalVariable *, DbgScope *> DbgScopeMap;
 143
 144   /// DbgAbstractScopeMap - Tracks abstract instance scopes in the current
 145   /// function.
 146   DenseMap<GlobalVariable *, DbgScope *> DbgAbstractScopeMap;
 147
 148   /// DbgConcreteScopeMap - Tracks concrete instance scopes in the current
 149   /// function.
 150   DenseMap<GlobalVariable *,
 151            SmallVector<DbgScope *, 8> > DbgConcreteScopeMap;
 152
 153   /// InlineInfo - Keep track of inlined functions and their location.  This
 154   /// information is used to populate debug_inlined section.
 155   DenseMap<GlobalVariable *, SmallVector<unsigned, 4> > InlineInfo;
 156
 157   /// InlinedVariableScopes - Scopes information for the inlined subroutine
 158   /// variables.
 159   DenseMap<const MachineInstr *, DbgScope *> InlinedVariableScopes;
 160
 161   /// AbstractInstanceRootMap - Map of abstract instance roots of inlined
 162   /// functions. These are subroutine entries that contain a DW_AT_inline
 163   /// attribute.
 164   DenseMap<const GlobalVariable *, DbgScope *> AbstractInstanceRootMap;
 165
 166   /// AbstractInstanceRootList - List of abstract instance roots of inlined
 167   /// functions. These are subroutine entries that contain a DW_AT_inline
 168   /// attribute.
 169   SmallVector<DbgScope *, 32> AbstractInstanceRootList;
 170
 171   /// LexicalScopeStack - A stack of lexical scopes. The top one is the current
 172   /// scope.
 173   SmallVector<DbgScope *, 16> LexicalScopeStack;
 174
 175   /// CompileUnitOffsets - A vector of the offsets of the compile units. This is
 176   /// used when calculating the "origin" of a concrete instance of an inlined
 177   /// function.
 178   DenseMap<CompileUnit *, unsigned> CompileUnitOffsets;
 179
 180   /// DebugTimer - Timer for the Dwarf debug writer.
 181   Timer *DebugTimer;
 182
 183   struct FunctionDebugFrameInfo {
 184     unsigned Number;
 185     std::vector<MachineMove> Moves;
 186
 187     FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
 188       : Number(Num), Moves(M) {}
 189   };
 190
 191   std::vector<FunctionDebugFrameInfo> DebugFrames;
 192
 193   /// getSourceDirectoryAndFileIds - Return the directory and file ids that
 194   /// maps to the source id. Source id starts at 1.
 195   std::pair<unsigned, unsigned>
 196   getSourceDirectoryAndFileIds(unsigned SId) const {
 197     return SourceIds[SId-1];
 198   }
 199
 200   /// getNumSourceDirectories - Return the number of source directories in the
 201   /// debug info.
 202   unsigned getNumSourceDirectories() const {
 203     return DirectoryNames.size();
 204   }
 205
 206   /// getSourceDirectoryName - Return the name of the directory corresponding
 207   /// to the id.
 208   const std::string &getSourceDirectoryName(unsigned Id) const {
 209     return DirectoryNames[Id - 1];
 210   }
 211
 212   /// getSourceFileName - Return the name of the source file corresponding
 213   /// to the id.
 214   const std::string &getSourceFileName(unsigned Id) const {
 215     return SourceFileNames[Id - 1];
 216   }
 217
 218   /// getNumSourceIds - Return the number of unique source ids.
 219   unsigned getNumSourceIds() const {
 220     return SourceIds.size();
 221   }
 222
 223   /// AssignAbbrevNumber - Define a unique number for the abbreviation.
 224   ///
 225   void AssignAbbrevNumber(DIEAbbrev &Abbrev);
 226
 227   /// CreateDIEEntry - Creates a new DIEEntry to be a proxy for a debug
 228   /// information entry.
 229   DIEEntry *CreateDIEEntry(DIE *Entry = NULL);
 230
 231   /// SetDIEEntry - Set a DIEEntry once the debug information entry is defined.
 232   ///
 233   void SetDIEEntry(DIEEntry *Value, DIE *Entry);
 234
 235   /// AddUInt - Add an unsigned integer attribute data and value.
 236   ///
 237   void AddUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer);
 238
 239   /// AddSInt - Add an signed integer attribute data and value.
 240   ///
 241   void AddSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer);
 242
 243   /// AddString - Add a string attribute data and value.
 244   ///
 245   void AddString(DIE *Die, unsigned Attribute, unsigned Form,
 246                  const std::string &String);
 247
 248   /// AddLabel - Add a Dwarf label attribute data and value.
 249   ///
 250   void AddLabel(DIE *Die, unsigned Attribute, unsigned Form,
 251                 const DWLabel &Label);
 252
 253   /// AddObjectLabel - Add an non-Dwarf label attribute data and value.
 254   ///
 255   void AddObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
 256                       const std::string &Label);
 257
 258   /// AddSectionOffset - Add a section offset label attribute data and value.
 259   ///
 260   void AddSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
 261                         const DWLabel &Label, const DWLabel &Section,
 262                         bool isEH = false, bool useSet = true);
 263
 264   /// AddDelta - Add a label delta attribute data and value.
 265   ///
 266   void AddDelta(DIE *Die, unsigned Attribute, unsigned Form,
 267                 const DWLabel &Hi, const DWLabel &Lo);
 268
 269   /// AddDIEEntry - Add a DIE attribute data and value.
 270   ///
 271   void AddDIEEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
 272     Die->AddValue(Attribute, Form, CreateDIEEntry(Entry));
 273   }
 274
 275   /// AddBlock - Add block data.
 276   ///
 277   void AddBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block);
 278
 279   /// AddSourceLine - Add location information to specified debug information
 280   /// entry.
 281   void AddSourceLine(DIE *Die, const DIVariable *V);
 282
 283   /// AddSourceLine - Add location information to specified debug information
 284   /// entry.
 285   void AddSourceLine(DIE *Die, const DIGlobal *G);
 286
 287   void AddSourceLine(DIE *Die, const DIType *Ty);
 288
 289   /// AddAddress - Add an address attribute to a die based on the location
 290   /// provided.
 291   void AddAddress(DIE *Die, unsigned Attribute,
 292                   const MachineLocation &Location);
 293
 294   /// AddType - Add a new type attribute to the specified entity.
 295   void AddType(CompileUnit *DW_Unit, DIE *Entity, DIType Ty);
 296
 297   /// ConstructTypeDIE - Construct basic type die from DIBasicType.
 298   void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
 299                         DIBasicType BTy);
 300
 301   /// ConstructTypeDIE - Construct derived type die from DIDerivedType.
 302   void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
 303                         DIDerivedType DTy);
 304
 305   /// ConstructTypeDIE - Construct type DIE from DICompositeType.
 306   void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
 307                         DICompositeType CTy);
 308
 309   /// ConstructSubrangeDIE - Construct subrange DIE from DISubrange.
 310   void ConstructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy);
 311
 312   /// ConstructArrayTypeDIE - Construct array type DIE from DICompositeType.
 313   void ConstructArrayTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
 314                              DICompositeType *CTy);
 315
 316   /// ConstructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
 317   DIE *ConstructEnumTypeDIE(CompileUnit *DW_Unit, DIEnumerator *ETy);
 318
 319   /// CreateGlobalVariableDIE - Create new DIE using GV.
 320   DIE *CreateGlobalVariableDIE(CompileUnit *DW_Unit,
 321                                const DIGlobalVariable &GV);
 322
 323   /// CreateMemberDIE - Create new member DIE.
 324   DIE *CreateMemberDIE(CompileUnit *DW_Unit, const DIDerivedType &DT);
 325
 326   /// CreateSubprogramDIE - Create new DIE using SP.
 327   DIE *CreateSubprogramDIE(CompileUnit *DW_Unit,
 328                            const DISubprogram &SP,
 329                            bool IsConstructor = false,
 330                            bool IsInlined = false);
 331
 332   /// FindCompileUnit - Get the compile unit for the given descriptor.
 333   ///
 334   CompileUnit &FindCompileUnit(DICompileUnit Unit) const;
 335
 336   /// CreateDbgScopeVariable - Create a new scope variable.
 337   ///
 338   DIE *CreateDbgScopeVariable(DbgVariable *DV, CompileUnit *Unit);
 339
 340   /// getOrCreateScope - Returns the scope associated with the given descriptor.
 341   ///
 342   DbgScope *getOrCreateScope(GlobalVariable *V);
 343
 344   /// ConstructDbgScope - Construct the components of a scope.
 345   ///
 346   void ConstructDbgScope(DbgScope *ParentScope,
 347                          unsigned ParentStartID, unsigned ParentEndID,
 348                          DIE *ParentDie, CompileUnit *Unit);
 349
 350   /// ConstructFunctionDbgScope - Construct the scope for the subprogram.
 351   ///
 352   void ConstructFunctionDbgScope(DbgScope *RootScope,
 353                                  bool AbstractScope = false);
 354
 355   /// ConstructDefaultDbgScope - Construct a default scope for the subprogram.
 356   ///
 357   void ConstructDefaultDbgScope(MachineFunction *MF);
 358
 359   /// EmitInitial - Emit initial Dwarf declarations.  This is necessary for cc
 360   /// tools to recognize the object file contains Dwarf information.
 361   void EmitInitial();
 362
 363   /// EmitDIE - Recusively Emits a debug information entry.
 364   ///
 365   void EmitDIE(DIE *Die);
 366
 367   /// SizeAndOffsetDie - Compute the size and offset of a DIE.
 368   ///
 369   unsigned SizeAndOffsetDie(DIE *Die, unsigned Offset, bool Last);
 370
 371   /// SizeAndOffsets - Compute the size and offset of all the DIEs.
 372   ///
 373   void SizeAndOffsets();
 374
 375   /// EmitDebugInfo / EmitDebugInfoPerCU - Emit the debug info section.
 376   ///
 377   void EmitDebugInfoPerCU(CompileUnit *Unit);
 378
 379   void EmitDebugInfo();
 380
 381   /// EmitAbbreviations - Emit the abbreviation section.
 382   ///
 383   void EmitAbbreviations() const;
 384
 385   /// EmitEndOfLineMatrix - Emit the last address of the section and the end of
 386   /// the line matrix.
 387   ///
 388   void EmitEndOfLineMatrix(unsigned SectionEnd);
 389
 390   /// EmitDebugLines - Emit source line information.
 391   ///
 392   void EmitDebugLines();
 393
 394   /// EmitCommonDebugFrame - Emit common frame info into a debug frame section.
 395   ///
 396   void EmitCommonDebugFrame();
 397
 398   /// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
 399   /// section.
 400   void EmitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo);
 401
 402   void EmitDebugPubNamesPerCU(CompileUnit *Unit);
 403
 404   /// EmitDebugPubNames - Emit visible names into a debug pubnames section.
 405   ///
 406   void EmitDebugPubNames();
 407
 408   /// EmitDebugStr - Emit visible names into a debug str section.
 409   ///
 410   void EmitDebugStr();
 411
 412   /// EmitDebugLoc - Emit visible names into a debug loc section.
 413   ///
 414   void EmitDebugLoc();
 415
 416   /// EmitDebugARanges - Emit visible names into a debug aranges section.
 417   ///
 418   void EmitDebugARanges();
 419
 420   /// EmitDebugRanges - Emit visible names into a debug ranges section.
 421   ///
 422   void EmitDebugRanges();
 423
 424   /// EmitDebugMacInfo - Emit visible names into a debug macinfo section.
 425   ///
 426   void EmitDebugMacInfo();
 427
 428   /// EmitDebugInlineInfo - Emit inline info using following format.
 429   /// Section Header:
 430   /// 1. length of section
 431   /// 2. Dwarf version number
 432   /// 3. address size.
 433   ///
 434   /// Entries (one "entry" for each function that was inlined):
 435   ///
 436   /// 1. offset into __debug_str section for MIPS linkage name, if exists;
 437   ///   otherwise offset into __debug_str for regular function name.
 438   /// 2. offset into __debug_str section for regular function name.
 439   /// 3. an unsigned LEB128 number indicating the number of distinct inlining
 440   /// instances for the function.
 441   ///
 442   /// The rest of the entry consists of a {die_offset, low_pc}  pair for each
 443   /// inlined instance; the die_offset points to the inlined_subroutine die in
 444   /// the __debug_info section, and the low_pc is the starting address  for the
 445   ///  inlining instance.
 446   void EmitDebugInlineInfo();
 447
 448   /// GetOrCreateSourceID - Look up the source id with the given directory and
 449   /// source file names. If none currently exists, create a new id and insert it
 450   /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
 451   /// as well.
 452   unsigned GetOrCreateSourceID(const std::string &DirName,
 453                                const std::string &FileName);
 454
 455   void ConstructCompileUnit(GlobalVariable *GV);
 456
 457   void ConstructGlobalVariableDIE(GlobalVariable *GV);
 458
 459   void ConstructSubprogram(GlobalVariable *GV);
 460
 461 public:
 462   //===--------------------------------------------------------------------===//
 463   // Main entry points.
 464   //
 465   DwarfDebug(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T);
 466   virtual ~DwarfDebug();
 467
 468   /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
 469   /// be emitted.
 470   bool ShouldEmitDwarfDebug() const { return shouldEmit; }
 471
 472   /// BeginModule - Emit all Dwarf sections that should come prior to the
 473   /// content.
 474   void BeginModule(Module *M, MachineModuleInfo *MMI);
 475
 476   /// EndModule - Emit all Dwarf sections that should come after the content.
 477   ///
 478   void EndModule();
 479
 480   /// BeginFunction - Gather pre-function debug information.  Assumes being
 481   /// emitted immediately after the function entry point.
 482   void BeginFunction(MachineFunction *MF);
 483
 484   /// EndFunction - Gather and emit post-function debug information.
 485   ///
 486   void EndFunction(MachineFunction *MF);
 487
 488   /// RecordSourceLine - Records location information and associates it with a
 489   /// label. Returns a unique label ID used to generate a label and provide
 490   /// correspondence to the source line list.
 491   unsigned RecordSourceLine(Value *V, unsigned Line, unsigned Col);
 492
 493   /// RecordSourceLine - Records location information and associates it with a
 494   /// label. Returns a unique label ID used to generate a label and provide
 495   /// correspondence to the source line list.
 496   unsigned RecordSourceLine(unsigned Line, unsigned Col, DICompileUnit CU);
 497
 498   /// getRecordSourceLineCount - Return the number of source lines in the debug
 499   /// info.
 500   unsigned getRecordSourceLineCount() const {
 501     return Lines.size();
 502   }
 503
 504   /// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
 505   /// timed. Look up the source id with the given directory and source file
 506   /// names. If none currently exists, create a new id and insert it in the
 507   /// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
 508   /// well.
 509   unsigned getOrCreateSourceID(const std::string &DirName,
 510                                const std::string &FileName);
 511
 512   /// RecordRegionStart - Indicate the start of a region.
 513   unsigned RecordRegionStart(GlobalVariable *V);
 514
 515   /// RecordRegionEnd - Indicate the end of a region.
 516   unsigned RecordRegionEnd(GlobalVariable *V);
 517
 518   /// RecordVariable - Indicate the declaration of  a local variable.
 519   void RecordVariable(GlobalVariable *GV, unsigned FrameIndex,
 520                       const MachineInstr *MI);
 521
 522   //// RecordInlinedFnStart - Indicate the start of inlined subroutine.
 523   unsigned RecordInlinedFnStart(DISubprogram &SP, DICompileUnit CU,
 524                                 unsigned Line, unsigned Col);
 525
 526   /// RecordInlinedFnEnd - Indicate the end of inlined subroutine.
 527   unsigned RecordInlinedFnEnd(DISubprogram &SP);
 528
 529   /// RecordVariableScope - Record scope for the variable declared by
 530   /// DeclareMI. DeclareMI must describe TargetInstrInfo::DECLARE. Record scopes
 531   /// for only inlined subroutine variables. Other variables's scopes are
 532   /// determined during RecordVariable().
 533   void RecordVariableScope(DIVariable &DV, const MachineInstr *DeclareMI);
 534 };
 535
 536 } // End of namespace llvm
 537
 538 #endif