path: root/lib/CodeGen/AsmPrinter/DwarfDebug.h

//===-- llvm/CodeGen/DwarfDebug.h - Dwarf Debug Framework ------*- C++ -*--===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for writing dwarf debug info into asm files.
//
//===----------------------------------------------------------------------===//

#ifndef CODEGEN_ASMPRINTER_DWARFDEBUG_H__
#define CODEGEN_ASMPRINTER_DWARFDEBUG_H__

#include "DIE.h"
#include "DwarfPrinter.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineLocation.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/UniqueVector.h"
#include <string>

namespace llvm {

class CompileUnit;
class DbgVariable;
class DbgScope;
class DbgConcreteScope;
class MachineFrameInfo;
class MachineModuleInfo;
class TargetAsmInfo;
class Timer;

//===----------------------------------------------------------------------===//
/// SrcLineInfo - This class is used to record source line correspondence.
///
class VISIBILITY_HIDDEN SrcLineInfo {
  unsigned Line;                     // Source line number.
  unsigned Column;                   // Source column.
  unsigned SourceID;                 // Source ID number.
  unsigned LabelID;                  // Label in code ID number.
public:
  SrcLineInfo(unsigned L, unsigned C, unsigned S, unsigned I)
    : Line(L), Column(C), SourceID(S), LabelID(I) {}

  // Accessors
  unsigned getLine() const { return Line; }
  unsigned getColumn() const { return Column; }
  unsigned getSourceID() const { return SourceID; }
  unsigned getLabelID() const { return LabelID; }
};

class VISIBILITY_HIDDEN DwarfDebug : public Dwarf {
  //===--------------------------------------------------------------------===//
  // Attributes used to construct specific Dwarf sections.
  //

  /// CompileUnitMap - A map of global variables representing compile units to
  /// compile units.
  DenseMap<Value *, CompileUnit *> CompileUnitMap;

  /// CompileUnits - All the compile units in this module.
  ///
  SmallVector<CompileUnit *, 8> CompileUnits;

  /// ModuleCU - All DIEs are inserted in ModuleCU.
  CompileUnit *ModuleCU;

  /// AbbreviationsSet - Used to uniquely define abbreviations.
  ///
  FoldingSet<DIEAbbrev> AbbreviationsSet;

  /// Abbreviations - A list of all the unique abbreviations in use.
  ///
  std::vector<DIEAbbrev *> Abbreviations;

  /// DirectoryIdMap - Directory name to directory id map.
  ///
  StringMap<unsigned> DirectoryIdMap;

  /// DirectoryNames - A list of directory names.
  SmallVector<std::string, 8> DirectoryNames;

  /// SourceFileIdMap - Source file name to source file id map.
  ///
  StringMap<unsigned> SourceFileIdMap;

  /// SourceFileNames - A list of source file names.
  SmallVector<std::string, 8> SourceFileNames;

  /// SourceIdMap - Source id map, i.e. pair of directory id and source file
  /// id mapped to a unique id.
  DenseMap<std::pair<unsigned, unsigned>, unsigned> SourceIdMap;

  /// SourceIds - Reverse map from source id to directory id + file id pair.
  ///
  SmallVector<std::pair<unsigned, unsigned>, 8> SourceIds;

  /// Lines - List of of source line correspondence.
  std::vector<SrcLineInfo> Lines;

  /// ValuesSet - Used to uniquely define values.
  ///
  FoldingSet<DIEValue> ValuesSet;

  /// Values - A list of all the unique values in use.
  ///
  std::vector<DIEValue *> Values;

  /// StringPool - A UniqueVector of strings used by indirect references.
  ///
  UniqueVector<std::string> StringPool;

  /// SectionMap - Provides a unique id per text section.
  ///
  UniqueVector<const MCSection*> SectionMap;

  /// SectionSourceLines - Tracks line numbers per text section.
  ///
  std::vector<std::vector<SrcLineInfo> > SectionSourceLines;

  /// didInitial - Flag to indicate if initial emission has been done.
  ///
  bool didInitial;

  /// shouldEmit - Flag to indicate if debug information should be emitted.
  ///
  bool shouldEmit;

  // FunctionDbgScope - Top level scope for the current function.
  //
  DbgScope *FunctionDbgScope;
  
  /// DbgScopeMap - Tracks the scopes in the current function.
  DenseMap<GlobalVariable *, DbgScope *> DbgScopeMap;

  /// DbgAbstractScopeMap - Tracks abstract instance scopes in the current
  /// function.
  DenseMap<GlobalVariable *, DbgScope *> DbgAbstractScopeMap;

  /// DbgConcreteScopeMap - Tracks concrete instance scopes in the current
  /// function.
  DenseMap<GlobalVariable *,
           SmallVector<DbgScope *, 8> > DbgConcreteScopeMap;

  /// InlineInfo - Keep track of inlined functions and their location.  This
  /// information is used to populate debug_inlined section.
  DenseMap<GlobalVariable *, SmallVector<unsigned, 4> > InlineInfo;

  /// AbstractInstanceRootMap - Map of abstract instance roots of inlined
  /// functions. These are subroutine entries that contain a DW_AT_inline
  /// attribute.
  DenseMap<const GlobalVariable *, DbgScope *> AbstractInstanceRootMap;

  /// AbstractInstanceRootList - List of abstract instance roots of inlined
  /// functions. These are subroutine entries that contain a DW_AT_inline
  /// attribute.
  SmallVector<DbgScope *, 32> AbstractInstanceRootList;

  /// LexicalScopeStack - A stack of lexical scopes. The top one is the current
  /// scope.
  SmallVector<DbgScope *, 16> LexicalScopeStack;

  /// CompileUnitOffsets - A vector of the offsets of the compile units. This is
  /// used when calculating the "origin" of a concrete instance of an inlined
  /// function.
  DenseMap<CompileUnit *, unsigned> CompileUnitOffsets;

  /// DebugTimer - Timer for the Dwarf debug writer.
  Timer *DebugTimer;
  
  struct FunctionDebugFrameInfo {
    unsigned Number;
    std::vector<MachineMove> Moves;

    FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
      : Number(Num), Moves(M) {}
  };

  std::vector<FunctionDebugFrameInfo> DebugFrames;

  /// getSourceDirectoryAndFileIds - Return the directory and file ids that
  /// maps to the source id. Source id starts at 1.
  std::pair<unsigned, unsigned>
  getSourceDirectoryAndFileIds(unsigned SId) const {
    return SourceIds[SId-1];
  }

  /// getNumSourceDirectories - Return the number of source directories in the
  /// debug info.
  unsigned getNumSourceDirectories() const {
    return DirectoryNames.size();
  }

  /// getSourceDirectoryName - Return the name of the directory corresponding
  /// to the id.
  const std::string &getSourceDirectoryName(unsigned Id) const {
    return DirectoryNames[Id - 1];
  }

  /// getSourceFileName - Return the name of the source file corresponding
  /// to the id.
  const std::string &getSourceFileName(unsigned Id) const {
    return SourceFileNames[Id - 1];
  }

  /// getNumSourceIds - Return the number of unique source ids.
  unsigned getNumSourceIds() const {
    return SourceIds.size();
  }

  /// AssignAbbrevNumber - Define a unique number for the abbreviation.
  ///
  void AssignAbbrevNumber(DIEAbbrev &Abbrev);

  /// CreateDIEEntry - Creates a new DIEEntry to be a proxy for a debug
  /// information entry.
  DIEEntry *CreateDIEEntry(DIE *Entry = NULL);

  /// SetDIEEntry - Set a DIEEntry once the debug information entry is defined.
  ///
  void SetDIEEntry(DIEEntry *Value, DIE *Entry);

  /// AddUInt - Add an unsigned integer attribute data and value.
  ///
  void AddUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer);

  /// AddSInt - Add an signed integer attribute data and value.
  ///
  void AddSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer);

  /// AddString - Add a string attribute data and value.
  ///
  void AddString(DIE *Die, unsigned Attribute, unsigned Form,
                 const std::string &String);

  /// AddLabel - Add a Dwarf label attribute data and value.
  ///
  void AddLabel(DIE *Die, unsigned Attribute, unsigned Form,
                const DWLabel &Label);

  /// AddObjectLabel - Add an non-Dwarf label attribute data and value.
  ///
  void AddObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
                      const std::string &Label);

  /// AddSectionOffset - Add a section offset label attribute data and value.
  ///
  void AddSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
                        const DWLabel &Label, const DWLabel &Section,
                        bool isEH = false, bool useSet = true);

  /// AddDelta - Add a label delta attribute data and value.
  ///
  void AddDelta(DIE *Die, unsigned Attribute, unsigned Form,
                const DWLabel &Hi, const DWLabel &Lo);

  /// AddDIEEntry - Add a DIE attribute data and value.
  ///
  void AddDIEEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
    Di